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Micrel
2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION
SuperLiteTM SY55858U
SuperLiteTM SY55858U
FEATURES
s Guaranteed AC parameters over temperature: * fMAX > 3.0GHz (3Gbps) * tr/ tf < 120ps * Within-device skew < 25ps s Non-blocking "switch architecture" s Configurable as dual 2:1 mux, dual 1:2 fanout buffer, 1:4 fanout buffer, quad buffer, or dual 2 x 2 switch s 50 compatible outputs s Unique input termination and VT pin for DC-coupled and AC-coupled input signals-CML or PECL s Fully differential inputs/outputs s TTL/CMOS compatible control logic s Wide supply voltage range: 2.3V to 3.6V s Wide operating temperature range: -40C to +85C s Available in 32-pin EPAD-TQFP package
SuperLiteTM
DESCRIPTION
The SY55858U is a low-voltage, high-speed dual 2 x 2 crosspoint switch with a flexible input that accepts CML or PECL, and a 50 compatible differential CML (currentmode logic) output. The non-blocking design allows any input to connect to any output. Varying the state of the select inputs allows SY55858U to be used in backup, fault tolerant, protection and backplane distribution applications. The signal inputs (DA0-1 and DB 0-1) have a unique internal termination design that allows access to the termination network through VT pins. This feature allows the device to easily interface to other logic standards such as AC-coupled or DC-coupled PECL/LVPECL signals. For applications that require a single-channel 2 x 2 crosspoint, consider the SY55854.
PIN CONFIGURATION
SELA0 SELA1 VTA1 VTA0 /DA1 /DA0 DA1 DA0
APPLICATIONS
s SONET/SDH optical transport s Backplane redundancy s Add-drop Multiplexers
GND VCC QA0 /QA0 VCC QA1 /QA1 VCC
DB1 VTB1 /DB1 SELB0 DB0 VTB0 /DB0 SELB1
1 2 3 4 5 6 7 8
32 31 30 29 28 27 26 25 24 23
Top View EPAD-TQFP H32-1
22 21 20 19 18
17 9 10 11 12 13 14 15 16
/QB0
/QB1
QB0
GND
VCC
QB1
SuperLite is a trademark of Micrel, Inc.
Rev.: C Amendment: /1
VCC
VCC
1
Issue Date: September 2003
Micrel
SuperLiteTM SY55858U
FUNCTIONAL BLOCK DIAGRAM
DA0 VTA0 /DA0 SELA0 DA1 VTA1 /DA1 SELA1
50 50 50 50
0 A0 1 CML
QA0 /QA0
0 A1 1
QA1 CML /QA1
DB0 VTB0 /DB0 SELB0 DB1 VTB1 /DB1 SELB1
50 50 50 50
0 B0 1 CML
QB0 /QB0
0 B1 1
QB1 CML /QB1
INPUT AND OUTPUT STAGE
VCC
vcc
D0 50 1.2mA VT* 50 /D0 1.2mA SY55858U
50
50 Q /Q
16mA
SY55858U
Figure 1. Input Stage
Figure 2. Output Stage
Note 1.
See "Input Interface Applications" section for proper input connection.
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Micrel
SuperLiteTM SY55858U
PIN DESCRIPTION
Pin Number 1 2 3 4 5 6 7 8 9, 24 10, 13, 16, 17, 20, 23 11 12 14 15 18 19 21 22 25 26 27 28 29 30 31 32 Pin Name DB1 VTB1 /DB1 SELB0 DB0 VTB0 /DB0 SELB1 GND VCC /QB0 QB0 /QB1 QB1 /QA1 QA1 /QA0 QA0 DA0 VTA0 /DA0 SELA1 DA1 VTA1 /DA1 SELA0 Pin Function Channel B1 posititve signal input. Channel B1 termination center-tap. For CML inputs, leave this pin floating. Otherwise, see Figures 5a-5d in "Input Interface Application" section. Channel B1 negative signal input. Channel B0 output select. TTL/CMOS input. Channel B0 positive signal input. Channel B0 termination center-tap. For CML inputs, leave this pin floating. Otherwise, see Figures 5a-5d in "Input Interface Application" section. Channel B0 negative signal input. Channel B1 output select. TTL/CMOS input. Supply Ground. Positive supply normally connect to 2.5V, 3.3V, or 5V nominal supply, and bypass each pin with 0.1F//0.01F low ESR capacitors. Channel B0 negative signal output. 50 CML. Channel B0 positive signal output. 50 CML. Channel B1 negative signal output. 50 CML. Channel B1 positive signal output. 50 CML. Channel A1 negative signal output. 50 CML. Channel A1 positive signal output. 50 CML. Channel A0 negative signal output. 50 CML. Channel A0 positive signal output. 50 CML. Channel A0 positive signal input. Channel A0 termination center-tap. For CML inputs, leave this pin floating. Otherwise, see Figures 5a-5d in "Input Interface Application" section. Channel A0 negative signal input. Channel A1 output select. TTL/CMOS input. Channel A1 positive signal input. Channel A1 termination center-tap. For CML inputs, leave this pin floating. Otherwise, see Figures 5a-5d in "Input Interface Application" section. Channel A1 negative signal input. Channel A1 output select. TTL/CMOS input.
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Micrel
SuperLiteTM SY55858U
TRUTH TABLES
SELA0 0 0 1 1 SELA1 0 1 0 1 QA0 DA0 DA0 DA1 DA1 QA1 DA0 DA1 DA0 DA1 Function Fanout Buffer or Redundant Distribution Dual Buffer or Crosspoint Dual Buffer or Crosspoint Fanout Buffer or Redundant Distribution
Table 1. Input to Output Connectivity Crosspoint A
SELB0 0 0 1 1
SELB1 0 1 0 1
QB0 DB0 DB0 DB1 DB1
QB1 DB0 DB1 DB0 DB1
Function Fanout Buffer or Redundant Distribution Dual Buffer or Crosspoint Dual Buffer or Crosspoint Fanout Buffer or Redundant Distribution
Table 2. Input to Output Connectivity Crosspoint B
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VCC VIN VOUT TA Tstore JA JC
Note 1.
Rating Power Supply Voltage Input Voltage CML Output Voltage Operating Temperature Range Storage Temperature Range Package Thermal Resistance (Junction-to-Ambient) Package Thermal Resistance (Junction-to-Case) -Still-Air (multi-layer PCB) -500lfpm (multi-layer PCB)
Value -0.5 to +6.0 -0.5 to VCC +0.5 VCC -1.0 to VCC +0.5 -40 to +85 -65 to +150 28 20 4
Unit V V V C C C/W C/W C/W
Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended periods may affect device reliability.
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Micrel
SuperLiteTM SY55858U
DC ELECTRICAL CHARACTERISTICS(1)
Symbol VCC ICC
Note 1.
Parameter Power Supply Voltage Power Supply Current
Min. 2.3 --
Typ. -- 150
Max. 3.6 190
Unit V mA
Condition
No load, over temp.
Specification for packaged product only.
TTL CONTROL ELECTRICAL CHARACTERISTICS(1)
VCC = 2.3V to 3.6V; GND = 0V; TA = -40C to +85C(2)
Symbol VIH VIL IIH IIL
Note 1. Note 2.
Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current
Min. 2.0 -- -- -- -300
Typ. -- -- -- -- --
Max. -- 0.8 +20 +100 --
Unit V V A A A
Condition
VIN = 2.7V, VCC = Max. VIN = VCC, VCC = Max. VIN = 0.5V, VCC = Max.
Specification for packaged product only. Specifications are guaranteed after thermal equilibrium has been establised.
CML DC ELECTRICAL CHARACTERISTICS(1)
VCC = 2.3V to 3.6V; GND = 0V; TA = -40C to +85C(2)
Symbol VID RIN VIH VIL VOH VOL Parameter Differential Input Voltage Differential Input Resistance D-to-/D Input HIGH Voltage Input LOW Voltage Output HIGH Voltage Output LOW Voltage Swing(3) Min. 100 80 1.6 1.5 VCC - 0.040 VCC - 1.00 0.650 -- 40 Typ. -- 100 -- -- VCC - 0.010 VCC - 0.800 0.800 0.400 50 Max. -- 120 VCC VCC - 0.1 VCC VCC - 0.650 1.00 -- 60 Unit mV V V V V V No Load No Load No Load 50 Environment Condition
VOUT(SWING) Output Voltage
ROUT
Note 1. Note 2. Note 3.
Output Source Impedance
Specification for packaged product only.
Device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that traverse airflow 500lfpm is maintained. VOUT(SWING) is defined as the swing on one output of a differential pair, that is |VOH - VOL| on one pin. The swing for common mode immunity purposes is 2 x VOUT(SWING). Actual voltage levels and differential swing will depend on customer termination scheme. Typically, a 400mV swing is available in the 50 environment. Refer to the "CML Output Termination Application" section, Figures 3 and 4, for more details.
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Micrel
SuperLiteTM SY55858U
AC ELECTRICAL CHARACTERISTICS(1)
VCC = 2.3V to 3.6V; GND = 0V; TA = -40C to +85C(2)
Symbol fMAX Parameter Maximum Frequency NRZ Data Rate Clock tPLH tPHL tSWITCH tSKEW Frequency(3) Min. 3.0 3.0 220 -- -- -- -- -- -- -- Typ. -- -- 350 0.50 12 25 100 2 5 80 Max. -- -- 450 1.0 25 50 -- 5 20 120 Unit Gbps GHz ps ns ps ps ps(rms) ps(pk-pk) ps Condition
Differential Propagation Delay D-to-Q Select-to-Valid Output(4) Within-Device Skew(5) Within-Device Skew(6) Part-to-Part Skew (Diff.) Random Jitter Deterministic Jitter CML Output Rise/Fall Times (20% to 80%)
Specification for packaged product only.
RJ DJ tr, tf
Note 1. Note 2. Note 3. Note 4. Note 5. Note 6.
Tested using environment of Figure 3, 50 equivalent load. AC parameters are guaranteed by design and characterization. fMAX clock is defined as the maximum toggle rate the device can operate while still achieving a 250mV minimum CML output swing, 50 equivalent load. Input TTL/CMOS edge rate of <1.5ns. Worst-case difference between QA0 and QA1 from either DA0 or DA1 (or between QB0 and QB1 from either DB0 or DB1 respectively), when both outputs come from the same input. Worst-case difference between QA and QB outputs, when DA or DB inputs are shorted.
CML OUTPUT TERMINATION APPLICATION
All CML inputs accept a CML output from any other member of this family. All CML outputs are source terminated
vcc
50 differential drivers as shown in Figure 3.
QOUT +
50
50
50 100 50
/QOUT QOUT
400mV (Single-Ended)
16mA
800mV (QOUT -- /QOUT Differential
SY55858U
/QOUT
Figure 3. 50 Output Termination
Figure 4. Output Levels
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Micrel
SuperLiteTM SY55858U
INPUT INTERFACE APPLICATIONS
VCC VCC VCC VCC
D CML /D SY55858 NC VT VCC - 1.3V CML
D /D SY55858 VT
Figure 5a. CML-to-CML (DC-Coupled) Input Interface
Figure 5b. CML-to-CML (AC-Coupled) Input Interface
VCC
VCC
VCC
VCC
D PECL /D SY55858 VT VCC - 2.0V 220 220 PECL
D /D SY55858 VT VCC - 1.3V
Figure 5c. PECL-to-CML (DC-Coupled) Input Interface
Figure 5d. PECL-to-CML (AC-Coupled) Input Interface
PRODUCT ORDERING CODE
Ordering Code SY55858UHI SY55858UHITR*
*Tape and Reel
Package Type H32-1 H32-1
Operating Range Industrial Industrial
Package Marking SY55858UHI SY55858UHI
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Micrel
SuperLiteTM SY55858U
32 LEAD EPAD-TQFP (DIE UP) (H32-1)
Rev. 01
MICREL, INC.
TEL
1849 FORTUNE DRIVE SAN JOSE, CA 95131
FAX
USA
+ 1 (408) 944-0800
+ 1 (408) 944-0970
WEB
http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2003 Micrel, Incorporated.
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