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smsc usb2412 datasheet revision 1.0 (02-12-10) datasheet product features general description the smsc usb2412 hub is a low-power, single transaction translator (stt) hub controller ic with two downstream ports for embedded usb applications. the smsc hub controller supports low-speed, full-speed, and hi-speed (if operating as a hi-speed hub) downstream devices on all of the enabled downstream ports. features ? fully integrated usb termination and pull-up/pull- down resistors ? supports a single external 3.3 v supply source; internal regulators provide 1.2 v internal core voltage ? on-chip 24 mhz crystal and ceramic resonator driver or external 24 mhz clock input ? esd protection up to 4 kilovolts on all usb pins ? supports self-powered operation ? contains a built-in default c onfiguration; no external configuration options or components are required ? downstream ports as optional non-removable ports ? supports compound devices on a port-by-port basis ? 28-pin qfn (5 x 5 mm) lead-free rohs compliant package ? supports the commercial temperature range: 0oc to +70oc highlights ? high performance, low-power, small footprint hub controller ic with two downstream ports ? fully compliant with the usb 2.0 specification ? 28qfn low pin count package ? optimized for mini mal bill-of-materials and low cost designs applications ? automobile/home audio systems ? cable/dsl modems ? embedded systems ? gaming consoles ? hdd enclosures ? ip telephony ? kvm switches ? lcd monitors and tvs ? multi-function usb peripherals ? mobile pc docking ? pc motherboards ? pc media drive bay ? portable hub boxes ? point-of-sale (pos) systems ? printers and scanners ? server front panels ? set-top boxes, dvd players, dvr/pvr ? thin client terminals usb2412 2-port usb 2.0 hi-speed hub controller
order numbers: product meets the halogen maximum concentration values per iec61249-2-21 for rohs compliance and environmental info rmation, please visit www.smsc.com/rohs. order numbers package type package size reel size usb2412-dzk 28-pin qfn lead-free, rohs compliant package (includes tape and reel option) 5 x 5 x 0.5 mm - USB2412-DZK-TR 2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 2 smsc usb2412 datasheet 80 arkay drive, hauppauge, ny 11788 (631) 435-6000, fax (631) 273-3123 copyright ? 2010 smsc or its subsidiaries. all rights reserved. circuit diagrams and other information relating to smsc produc ts are included as a means of illustrating typical applications. consequently, complete information sufficient for construction purposes is not necessarily given. although the information has been checked and is believed to be accurate, no re sponsibility is assumed for inaccuracies. smsc reserves the right to make changes to specifications and produc t descriptions at any time without notice. contact your local sm sc sales office to obtain the latest specifications before placing your product order. the provision of this inform ation does not convey to the purchaser of the described semicond uctor devices any licenses under any patent rights or other intellectual property rights of smsc or others. all sales are expressly conditional on your agreement to the te rms and conditions of the most recently dated version of smsc's standard terms of sale agreement dated before the date of your order (the "terms of sale agreement"). the pro duct may contain design defects or errors known as anomalies which may cause the product's functions to deviate from published specifications. anomaly sheets are availab le upon request. smsc products are not designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property damage. any and all such uses without prior written approval of an officer of smsc and further testing and/or modification will be fully at the risk of the customer. copies of this document or other smsc literature, as well as the terms of sale agreement, may be obtained by visiting smsc?s website at h ttp://www.smsc.com. smsc is a registered trademark of standard microsystems corporat ion (?smsc?). product names and company na mes are the trademarks of their respective holders. smsc disclaims and excludes any and all warranties, including without limitation any and all implied warranties of merchantabil ity, fitness for a particular purpose, title, and against infringement and the like, and any and all warranties arising from any cou rse of dealing or usage of trade. in no event shall smsc be liable for any direct, incidental, indirect, special, punitive, or cons equential damages; or for lost data, profits, savings or revenues of any kind; regardless of the form of action, whether based on contrac t; tort; negligence of smsc or others; strict liability; breach of warranty; or otherwise; whether or not any remedy of buyer is h eld to have failed of its essential purpose, and whether or no t smsc has been advised of the possibility of such damages.
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 3 revision 1.0 (02-12-10) datasheet table of contents chapter 1 acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 chapter 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 chapter 3 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 28-pin table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 pin descriptions (grouped by function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.4 buffer type descriptio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.5 non-removable strap option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.6 led strap option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 chapter 4 internal default configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1 hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.1.1 hub configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2.1 external hardware r eset_n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.2.2 usb bus reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 chapter 5 dc parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.1 maximum guaranteed ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.2 operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5.2.1 pin capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5.2.2 package thermal specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 chapter 6 ac specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.1 oscillator/crystal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.2 ceramic resonator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.3 external clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.3.1 usb 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 chapter 7 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 7.1 tape and reel specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 4 smsc usb2412 datasheet list of tables table 3.1 usb2412 28-pin table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 3.2 usb2412 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 3.3 buffer type descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4.1 reset_n timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 5.1 dc electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 5.2 pin capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 5.3 36-pin qfn package thermal parame ters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 table 6.1 crystal circuit legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 7.1 package parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 5 revision 1.0 (02-12-10) datasheet list of figures figure 2.1 usb2412 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3.1 2-port 28-pin qfn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 3.2 non-removable pin strap example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 3.3 led pin strap example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 4.1 reset_n timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 5.1 supply rise time model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 6.1 typical crystal circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 6.2 formula to find the value of c1 and c2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 6.3 ceramic resonator usage with smsc ic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 7.1 usb2412 28-pin qfn package outline (5x5 mm bo dy, 0.5 pitch, 3.1 epad). . . . . . . . . . . . 23 figure 7.2 recommended printed circuit board (pcb) land patt ern . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 7.3 28-pin package tape dimensions and part orientat ion (mm) . . . . . . . . . . . . . . . . . . . . . . . 24 figure 7.4 28-pin package tape length and part quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 7.5 package reel specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 6 smsc usb2412 datasheet chapter 1 acronyms ocs: over-current sense pcb: printed circuit board phy: physical layer pll: phase-locked loop qfn: quad flat no leads rohs: restriction of hazardous substances directive sie: serial interface engine tt: transaction translator
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 7 revision 1.0 (02-12-10) datasheet chapter 2 block diagram figure 2.1 usb2412 block diagram to upstream v bus 3.3 v upstream phy upstream usb data repeater controller serial interface engine port controller bus- power detect/ v bus pulse phy#1 transaction translator usb data downstream usb data downstream 3.3 v pll 24 mhz crystal routing & port re-ordering logic regulator crfilt regulator phy#2
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 8 smsc usb2412 datasheet chapter 3 pin descriptions this chapter is organized by a se t of pin configurations followed by a corresponding pin list organized by function according to their associated interface. a detailed description list of each signal (named in the pin list) is organized by function in table 3.2, ?usb2412 pin descriptions,? on page 10 . please refer to table 3.3, ?buffer type descriptions,? on page 12 for a list of buffer types. the ?n? symbol in the signal name indicates that th e active, or asserted, state occurs when the signal is at a low voltage level. when ?n? is not present af ter the signal name, the signal is asserted when it is at the high voltage level. the terms assertion and negation are used exclusively. this is done to avoid confusion when working with a mixture of ?active low? and ?active high? signals. the term asser t, or assertion, indicates that a signal is active, independent of whether that level is represented by a high or low voltage. the term negate, or negation, indicates that a signal is inactive. 3.1 pin configuration figure 3.1 2-port 28-pin qfn ground pad (must be connected to vss) smsc usb2412 (top view qfn-28) indicates pins on the bottom of the device. xtalout 23 xtalin / clkin 24 usbdp_up 22 pllfilt 25 rbias 26 usbdm_dn[1] 28 vdd33 27 nc 1 usbdp_dn[1] 2 usbdm_dn[2] 3 usbdp_dn[2] 4 vdd33 5 test 6 prtpwr[1] 7 14 vdd33 13 non_rem[1] 12 vdd33 11 ocs_n[2] 10 prtpwr[2] 9 crfilt 8 ocs_n[1] 21 usbdm_up 20 vdd33 19 susp_ind / non_rem[0] 18 vbus_det 17 reset_n 16 hs_ind 15 vss
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 9 revision 1.0 (02-12-10) datasheet 3.2 28-pin table table 3.1 usb2412 28-pin table upstream usb 2.0 interfaces (3 pins) usbdp_up usbdm_up vbus_det downstream 2-port usb 2.0 interfaces (9 pins) usbdp_dn[1] usbdm_dn[1] usbdp_dn[2] usbdm_dn[2] prt_pwr[1] prt_pwr[ 2] ocs_n[1] ocs_n[2] rbias misc (7 pins) reset_n test xtalin / clkin xtalout non_rem[1] susp_ind / non_rem[0] hs_ind power, ground, and no connects (9 pins) (5) vdd33 crfilt pllfilt vss nc total 28
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 10 smsc usb2412 datasheet 3.3 pin descriptions (grouped by function) table 3.2 usb2412 pin descriptions pin # symbol buffer type description upstream usb 2.0 interfaces 21 22 usbdm_up usbdp_up io-u usb bus data these pins connect to the upstream usb bus data signals (host, port, or upstream hub). 18 vbus_det i/o12 detect upstream vbus power detects the state of upstream vbus power. the smsc hub monitors vbus_det to determine when to assert the internal d+ pull-up resistor which signals a connect event. when designing a detachable hub, this pin should be connected to vbus on the upstream port via a 2 to 1 voltage divider. for self-powered applications with a permanently attached host, this pin must be connected to 3.3 v. according to section 7.2.1 of the u sb 2.0 specification, a downstream port can never provide power to its d+ or d- pull-up resistors unless the upstream port?s vbus is in the asserted (powered) state. the vbus_det pin on the hub monito rs the state of the upstream vbus signal and will not pull-up the d+ resistor if vbus is not active. if vbus goes from an active to an inactive state (not powered), the hub will remove power from the d+ pull-up resistor within 10 seconds. downstream usb 2.0 interfaces 1 3 28 2 usbdp_dn[1] usbdp_dn[2] usbdm_dn[1] usbdm_dn[2] io-u hi-speed usb data these pins connect to the downstream usb peripheral devices attached to the hub?s ports. 7 11 prtpwr[1] prtpwr[2] ipd usb power enable enables power to usb peripheral de vices that are downstream. the hub supports active high power controllers only. 8 12 ocs_n[1] ocs_n[2] ipu over-current sense input from external current monitor indicating an over-current condition. this pin contains an internal pull-up to the 3.3 v supply. 26 rbias i-r usb transceiver bias a 12.0 k (+/- 1%) resistor is attached from ground to this pin to set the transceiver?s internal bias settings.
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 11 revision 1.0 (02-12-10) datasheet misc 13 non_rem[1] i/o non-removable port strap option this pin will be sampled (in conjunction with susp_ind / non_rem[0]) at reset_n negation to determ ine if ports [2:1] contain permanently attached (non-removable) devices: non_rem[1:0] = ?00?, all ports are removable. non_rem[1:0] = ?01?, port 1 is non-removable. non_rem[1:0] = ?1x, ports 1 and 2 are non-removable. please see section 3.5, "non-removable strap option" for a complete description. 19 susp_ind / non_rem[0] i/o active/suspend status led suspend indicator: indicates usb hub state. please see section 3.6, "led strap option" for a complete description. non_rem[0] = ?0?, susp_ind is active high. non_rem[0] = ?1?, susp_ind is active low. ?negated? = unconfigured, or configured and in usb suspend ?asserted? = the hub is configured and is active (i.e., not in suspend) non-removable port strap option this pin will be sampled (in co njunction with non_rem[1]) at reset_n negation to determine if ports [2:1] contain permanently attached (non-remo vable) devices: non_rem[1:0] = ?00?, all ports are removable. non_rem[1:0] = ?01?, port 1 is non-removable. non_rem[1:0] = ?1x?, ports 1 and 2 are non-removable. please see section 3.5, "non-removable strap option" for a complete description. 16 hs_ind i/o12 hi-speed upstream port indicator hs_ind: hi-speed indicator for upst ream port connection speed. note: an led can be attached for visual indication. please see section 3.6, "led strap option" for a complete description. when an led is not used, this pin requires a 50 k or higher resistor to ground. ?asserted? = the hub is connected at hs ?negated? = the hub is connected at fs 24 xtalin iclkx 24 mhz crystal input this pin connects to either one terminal of the crystal or to an external 24 mhz clock when a crystal is not used. clkin external clock input this pin connects to either one terminal of the crystal or to an external 24 mhz clock when a crystal is not used. table 3.2 usb2412 pin descriptions (continued) pin # symbol buffer type description
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 12 smsc usb2412 datasheet 3.4 buffer type descriptions 23 xtalout oclkx 24 mhz crystal output this is the other terminal of the cr ystal, or a no connect pin, when an external clock source is used to drive xtalin/clkin. 6 test ipd test pin user must treat as a no connect pi n or connect to ground. no trace or signal should be routed or attached to this pin. 17 reset_n is reset input the system can reset the chip by driving this input low. the minimum active low pulse is 1 s. power, ground, and no connects 9 crfilt vdd core regulator filter capacitor this pin must have a 1.0 f (or greater) 20% (esr <0.1 ) capacitor to vss. 4 10 14 20 27 vdd33 3.3 v power 25 pllfilt pll regulator filter capacitor this pin must have a 1.0 f (or greater) 20% (esr <0.1 ) capacitor to vss. 15 vss ground pad / epad the package slug is the only vss for the device and must be tied to ground with multiple vias. 5 nc no connect no signal or trace should be routed or attached to these pins. table 3.3 buffer type descriptions buffer description i/o input/output. ipd input with internal weak pull-down resistor. ipu input with internal weak pull-up resistor. table 3.2 usb2412 pin descriptions (continued) pin # symbol buffer type description
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 13 revision 1.0 (02-12-10) datasheet 3.5 non-removable strap option the strap function of pins 13 and 19 are enabled thru the internal default configuration. the driver type of each strap pin is i/o (no internal pull-up or pull -down for the input function). use this type of strap option for non_rem[1:0]. figure 3.2 shows an example of strap high and strap low. use the strap high configuration to set the strap option value to a ?1?. use the strap low configuration to set the strap option value to ?0?. figure 3.2 non-removable pin strap example 3.6 led strap option the strap function of pins 13 and 19 are enabled thru the internal default configuration. the driver type of each strap pin is i/o (no internal pull-up or pull-down for the input function). when the strap pin shares functionality wit h an led, use this type of strap option. the internal logic will drive the led appropriately (active high or low) depending on the sampled strap option. figure 3.3 shows an example of strap high and strap low. use the strap high configuration to set the strap option value to a ?1?. use the strap low configuration to set the strap option value to ?0?. figure 3.3 led pin strap example is input with schmitt trigger. i/o12 input/output buffer with 12 ma sink and 12 ma source. iclkx xtal clock input. oclkx xtal clock output. i-r rbias. i/o-u analog input/output def ined in usb specification. table 3.3 buffer type descriptions (continued) buffer description hub strap pin primary function/ strap high +v hub strap pin primary function/ strap low gnd 50 k 50 k hub strap pin led/ strap high hub strap pin led/ strap low 50 k 50 k
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 14 smsc usb2412 datasheet chapter 4 internal default configuration 4.1 hub smsc?s usb 2.0 hub is fully specif ication compliant to the universal serial bus specification, version 2.0, april 27, 2000 (12/7/2000 and 5/28/2002 errata). please referenc e chapter 10 (hub specification) for general details regarding hub operation and functionality. the hub provides 1 transaction translator (tt) t hat is shared by both down stream ports (defined as single-tt configuration). the tt contains 4 non-periodic buffers. 4.1.1 hub configuration the usb2412 only supports internal defaults with the exception of the non-removable strap option (non_rem[1:0]). the hub internal default settings are as follows: ? internal default configuration without any over-rides ? strap options enabled ? self-powered operation enabled ? individual power switching ? individual over-current sensing 4.2 reset there are two different resets th at the hub exper iences. one is a hardwa re reset via the reset_n pin and the second is a usb bus reset. 4.2.1 external hardware reset_n a valid hardware reset is defined as assertion of reset_n for a minimum of 1 s after all power supplies are within operating range. while reset is asserted, the hub (and its associated external circuitry) consumes less than 500 a of current from the upstream usb power source. assertion of reset_n (external pin) causes the following: 1. all downstream ports are disabled, and prtpwr power to downstream devices is removed. 2. the phys are disabled, and the differential pairs will be in a high-impedance state. 3. all transactions immediately terminate; no states are saved. 4. all internal registers return to the default state (in most cases, 00(h)). 5. the external crystal oscillator is halted. 6. the pll is halted. 7. the hub is ?operational? 500 s after reset_n is negated.
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 15 revision 1.0 (02-12-10) datasheet 4.2.1.1 reset_n figure 4.1 reset_n timing note: all power supplies must have reached the operating levels mandated in chapter 5, dc parameters , prior to (or coincident with ) the assertion of reset_n. 4.2.2 usb bus reset in response to the upstream port signaling a reset to the hub, the hub does the following: note: the hub does not propagate the upstre am usb reset to downstream devices. 1. sets default address to ?0?. 2. sets configuration to: unconfigured. 3. negates prtpwr[2:1] to all downstream ports. 4. clears all tt buffers. table 4.1 reset_n timing name description min typ max units t1 reset_n asserted. 1 sec t2 strap setup time 16.7 nsec t3 strap hold time. 16.7 1400 nsec t4 hub outputs driven to inactive logic states 1.5 2 sec t5 usb attach (see note). 100 msec t6 host acknowledges attach and signals usb reset. 100 msec t7 usb idle. undefined msec t8 completion time for requests (with or without data stage). 5 msec t1 t4 t5 t6 t7 t8 valid driven by hub if strap is an output. reset_n vss strap pins vss hardware reset asserted read strap options drive strap outputs to inactive levels attach usb upstream usb reset recovery idle start completion request response t2 t3 don?t care don?t care
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 16 smsc usb2412 datasheet 5. moves device from suspended to active (if suspended). 6. complies with section 11.10 of t he usb 2.0 specification for behavio r after completion of the reset sequence. the host then configures the hub and t he hub?s downstream port devices in accordance with the usb sp ecification. note: the hub does not propagate the upstre am usb reset to downstream devices.
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 17 revision 1.0 (02-12-10) datasheet chapter 5 dc parameters 5.1 maximum guaranteed ratings note 5.1 please refer to jedec specification j-std-020d. note 5.2 stresses above the specified parameters co uld cause permanent damage to the device. this is a stress rating only and functional operation of the device at any condition above those indicated in the operation sections of this specification is not implied. note 5.3 when powering this device from laboratory or system power supplies, it is important that the absolute maximum ratings not be exceeded or device failure can result. some power supplies exhibit voltage spikes on their outputs when the ac power is switched on or off. in addition, voltage transients on the ac power line may appear on the dc output. when this possibility exists, it is suggested that a clamp circuit be used. 5.2 operating conditions parameter symbol min max units storage temperature t stor -55 150 c lead temperature c 3.3 v supply voltage vdd33 pllfilt crfilt 4.6 v voltage on any i/o pin -0.5 5.5 v voltage on xtalin -0.5 4.0 v voltage on xtalout -0.5 2.5 v parameter symbol min max units comments operating temperature t a 0 70 c ambient temperature in still air. 3.3 v supply voltage vdd33 3.0 3.6 v 3.3 v supply rise time t rt 0 400 s see figure 5.1 voltage on any i/o pin -0.3 5.5 v if any 3.3 v supply voltage drops below 3.0 v, then the max becomes: (3.3 v supply voltage) + 0.5 voltage on xtalin -0.3 vdd33 v
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 18 smsc usb2412 datasheet figure 5.1 supply rise time model table 5.1 dc electrical characteristics parameter symbol min typ max units comments i, is type input buffer low input level high input level input leakage hysteresis (?is? only) v ili v ihi i il v hysi 2.0 -10 250 0.8 +10 350 v v a mv ttl levels v in = 0 to vdd33 input buffer with pull-up (ipu) low input level high input level low input leakage high input leakage v ili v ihi i ill i ihl 2.0 +35 -10 0.8 +90 +10 v v a a ttl levels v in = 0 v in = vdd33 input buffer with pull-down (ipd) low input level high input level low input leakage high input leakage v ili v ihi i ill i ihl 2.0 +10 -35 0.8 -10 -90 v v a a ttl levels v in = 0 v in = vdd33 iclk input buffer low input level high input level input leakage v ilck v ihck i il 1.4 -10 0.5 +10 v v a v in = 0 to vdd33 t 10% 10% 90% voltage t rt t 90% time 100% 3.3 v vss vdd33
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 19 revision 1.0 (02-12-10) datasheet note 5.4 output leakage is measured with the current pins in high impedance. note 5.5 see usb 2.0 specification for u sb dc electrical characteristics. o12, i/o12 &i/osd12 type buffer low output level high output level output leakage hysteresis (?sd? pad only) v ol v oh i ol v hysc 2.4 -10 250 0.4 +10 350 v v a mv i ol = 12 ma @ vdd33 = 3.3 v i oh = -12 ma @ vdd33 = 3.3 v v in = 0 to vdd33 ( note 5.1 ) supply current unconfigured hi-speed host i ccinths 40 45 ma supply current unconfigured full-speed host i ccintfs 35 40 ma supply current configured hi-speed host, 1 downstream port i hch1 60 65 ma supply current configured hi-speed host, each additional downstream port 1 port base + 25 ma 1 port base + 25 ma ma supply current configured full-speed host, 1 downstream port i fcc1 45 50 ma there is no additional current for additional ports. supply current configured full-speed host, each additional downstream port 1 port base + 8 ma 1 port base + 8 ma ma supply current suspend i csby 475 1000 a all supplies combined supply current reset i crst 550 1100 a all supplies combined table 5.1 dc electrical characteristics (continued) parameter symbol min typ max units comments
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 20 smsc usb2412 datasheet 5.2.1 pin capacitance 5.2.2 package thermal specifications thermal parameters are measured or estimated for dev ices with the exposed pad soldered to thermal vias in a multilayer 2s2p pcb per jesd51. ther mal resistance is measured from the die to the ambient air. table 5.2 pin capacitance limits parameter symbol min typ max unit test condition clock input capacitance c xtal 6 pf all pins except usb pins and the pins under the test tied to ac ground. input capacitance c in 6 pf capacitance t a = 25c fc = 1 mhz vdd33 = 3.3 v output capacitance c out 6 pf the maximum capacitance values include the full length of the pin pad. please see the y dimension in figure 7.2 . table 5.3 36-pin qfn package thermal parameters parameter velocity (meters/sec) symbol value unit thermal resistance 0 ja 40.3 c/w 1 35.2 junction-to-top-of-package 0 jt 0.5 c/w 10.6
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 21 revision 1.0 (02-12-10) datasheet chapter 6 ac specifications 6.1 oscillator/crystal parallel resonant, fundamental mode, 24 mhz 350 ppm. figure 6.1 typical crystal circuit table 6.1 crystal circuit legend figure 6.2 formula to find the value of c 1 and c 2 note 6.1 c 0 is usually included (subtracted by the crys tal manufacturer) in the specification for c l and should be set to ?0? for use in the calculation of the capacitance formulas in figure 6.2, "formula to find the value of c1 and c2" . however, the oem pcb itself may present a parasitic capacitance between xtalin and xtalout. for an accurate calculation of c 1 and c 2, take the parasitic capacitance between traces xtalin and xtalout into account. note 6.2 each of these capacitance values is typically approximately 18 pf. symbol description in accordance with c 0 crystal shunt capacitance crystal manufacturer?s specification (see note 6.1 ) c l crystal load capacitance c b total board or trace capacitance oem board design c s stray capacitance smsc ic and oem board design c xtal xtal pin input capacitance smsc ic c 1 load capacitors installed on oem board calculated values based on figure 6.2, "formula to find the value of c1 and c2" (see note 6.2 ) c 2 xtal1 (c s1 = c b1 + c xtal1 ) xtal2 (c s2 = c b2 + c xtal2 ) c 1 c 2 c l 1 m crystal c 0 c 1 = 2 x (c l ? c 0 ) ? c s1 c 2 = 2 x (c l ? c 0 ) ? c s2
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 22 smsc usb2412 datasheet 6.2 ceramic resonator 24 mhz 350 ppm figure 6.3 ceramic resonator usage with smsc ic 6.3 external clock 50% duty cycle 10%, 24 mhz 350 ppm, jitter < 100 ps rms. the external clock is recomm ended to conform to the signaling level designated in the jesd76-2 specification on 1.8 v cmos logic. xtal out should be treated as a no connect. 6.3.1 usb 2.0 the smsc hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the usb 2.0 specification. please refer to the usb 2.0 specification for more information. xtal1 xtal2 1 m 24 mhz ceramic resonator
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 23 revision 1.0 (02-12-10) datasheet chapter 7 package outline figure 7.1 usb2412 28-pin qfn package outline (5x5 mm body, 0.5 pitch, 3.1 epad) notes: 1. all dimensions are in millimeters. 2. position tolerance of each terminal and exposed pad is 0.05 mm at maximum material condition. instances of dimension ?b? apply to plated terminals and is measured between 0.15 and 0.33 mm from the terminal tip. 3. details of terminal #1 identifier are optional. however, they must be located within the area indicated. 4. coplanarity zone applies to exposed pad and terminals. table 7.1 package parameters min nominal max note remarks a 0.80 0.85 1.00 - overall package height a1 0 0.02 0.05 - standoff a2 0.60 - 0.80 - mold cap thickness d/e 4.90 5.00 5.10 - x/y overall body size d1/e1 4.55 4.75 4.95 - x/y mold cap size d2/e2 3.00 3.10 3.20 - x/y exposed pad size l 0.30 0.40 0.50 - terminal length b 0.18 0.25 0.30 2 terminal width k 0.45 0.55 - - terminal to epad clearance e 0.50 bsc - terminal pitch
2-port usb 2.0 hi-speed hub controller datasheet revision 1.0 (02-12-10) 24 smsc usb2412 datasheet figure 7.2 recommended printed circuit board (pcb) land pattern 7.1 tape and reel specification figure 7.3 28-pin package tape dime nsions and part orientation (mm) figure 7.4 28-pin package tape length and part quantity
2-port usb 2.0 hi-speed hub controller datasheet smsc usb2412 25 revision 1.0 (02-12-10) datasheet figure 7.5 package reel specifications

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