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| IMP51 1 1/51 1 2 IMP52 8 DATA COMMUNICATIONS 9-Line Plug and Play SCSI Terminator The 9-channel IMP5218 SCSI terminator is part of IMP's family of highperformance SCSI terminators that deliver true UltraSCSI performance. The BiCMOS design offers superior performance over first generation linear regulator/resistor based terminators. The IMP5218 has two disconnect pins for SCSI Plug and Play (PnP) applications. IMP's new architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible - typically 35MHz, which is 100 times faster than the older linear regulator terminator approach. The bandwidth of terminators based on the older regulator/resistor terminator architecture is limited to 500kHz since a large output stabilization capacitor is required. The IMP architecture eliminates the external output compensation capacitor and the need for transient output capacitors while maintaining pin compatibility with first generation designs. Reduced component count is inherent with the IMP5218. The IMP5218 architecture tolerates marginal system designs. A key improvement offered by the IMP5218 lies in its ability to insure reliable, error-free communications even in systems which do not adhere to recommended SCSI hardware design guidelines, such as improper cable lengths and impedance. Frequently, this situation is not controlled by the peripheral or host designer. For portable and configurable peripherals, the IMP5218 can be placed in a sleep mode with two disconnect signals. When disabled, the quiescent current is typically 375A, and the outputs are in a high impedance state. Key Features x SCSI plug and play -- Dual disconnect pins -- Logic LOW disconnects lines x Hot swap compatible x Ultra-Fast response for Fast-20 SCSI applications x 35MHz channel bandwidth x 3.5V operation x Less than 3pF output capacitance x 375A disable-mode current x Thermally self limiting x No external compensation capacitors x Implements 8-bit or 16-bit (wide) applications x Compatible with active negation drivers (60mA/channel) x Compatible with passive and active terminations x Approved for use with SCSI 1, 2, 3 and UltraSCSI Block Diagrams Term Power Thermal Limiting Circuit Current Biasing Circuit 24mA Current Limiting Circuit DATA OUTPUT PIN DB (0) 2.85V DISCONNECT 1 DISCONNECT 2 1 of 9 Channels 5218_01.eps (c) 2000 IMP, Inc. Data Communications 1 IMP51 1 1/51 1 2 IMP52 8 Pin Configuration SOWB-16 TERM POWER NC D0 D1 D2 D3 D4 GND 1 2 3 4 5 6 7 8 DW Package IMP5218 16 TERM POWER 15 DISCONNECT 1 14 DISCONNECT 2 13 D8 12 D7 11 D6 10 D5 9 GND 5218_02.eps TSSOP-20 TERM POWER NC NC D0 D1 D2 D3 D4 NC 1 2 3 4 5 6 7 8 9 IMP5218 20 TERM POWER 19 DISCONNECT 1 18 DISCONNECT 2 17 D8 16 D7 15 NC 14 D6 13 D5 12 NC 11 GND PW Package 5218_02a.eps GND 10 Ordering Information Part Number IMP5218CDW IMP5218CDWT IMP5218CPW IMP5218CPWT Temperature Range 0C to 125C 0C to 125C 0C to 125C 0C to 125C Package 16-pin Plastic SOWB Tape and Reel, 16-pin Plastic SOWB 20-pin Plastic TSSOP Tape and Reel, 20-pin Plastic TSSOP 5218_t01.at3 Absolute Maximum Ratings1 Continuous Termination Voltage . . . . . . . . . . . 10V Continuous Output Voltage Range . . . . . . . . 0V to 5.5V Continuous Disable Voltage Range . . . . . . . . 0V to 5.5V Operating Junction Temperature . . . . . . . . . . 0C to 125C Storage Temperature Range . . . . . . . . . . . . . . -65C to 150C Lead Temperature (Soldering, 10 sec.) . . . . . . 300C Note: 1. Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Thermal Data DW Package: Thermal Resistance Junction-to-Ambient, JA . . . . . . 95C/W PW Package: Thermal Resistance Junction-to-Ambient, JA . . . . . . 144C/W Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the ambient airflow is assumed. 2 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP51 1 1/51 1 2 IMP52 8 Recommended Operating Conditions2 Parameter Termpwr Voltage High Level Disable Input Voltage Low Level Disable Input Voltage Operating Junction Temperature Range Symbol VTERM VIH VIL Min 3.5 2 0 0 Typ Max 5.5 VTERM 0.8 125 Units V V V C 5218_t02.eps Note: 2. Recommended operating conditions indicate the range over which the device is functional. Electrical Characteristics Unless otherwise specified, these specifications apply at an ambient operating temperature of TA = 25C. TermPwr = 4.75V. Low duty cycle pulse testing techniques are used which maintain junction and case temperatures equal to the ambient temperature. Parameter Output High Voltage TermPwr Supply Current Symbol Conditions VOUT ICC All data lines = Open All data lines = 0.5V DISCONNECT Pins 1, 2 = 0V Min 2.65 Typ 2.85 6 215 375 Max 9 225 -24 Units V mA mA A mA A A nA pF MHz mA 5218_t03.eps Output Current Disable Input Current Output Leakage Current Capacitance in Disabled Mode Channel Bandwidth Termination Sink Current, per Channel IOUT IIN IOL COUT BW ISINK VOUT = 0.5V DISCONNECT Pins 1, 2 = 4.75V DISCONNECT Pins 1, 2 = 0V DISCONNECT Pins = 0V, VO = 0.5V VOUT = 0V, Frequency = 1MHz VOUT = 4V -21 -23 90 -10 10 3 35 60 (c) 2000 IMP, Inc. Data Communications 3 IMP51 1 1/51 1 2 IMP52 8 Application Information Figure 1. Receiving Waveform - 20MHz Figure 2. Driving Waveform - 20MHz Receiver 1 Meter, AWG 28 IMP5218 Driver IMP5218 5218_03.eps Figure 3. IMP5218 Maximizes Line Current Cable transmission theory suggests to optimize signal speed and quality, the termination should act both as an ideal voltage reference when the line is released (deasserted) and as an ideal current source when the line is active (asserted). Common active terminators which consist of linear regulators in series with resistors (typically 110) are a compromise. With coventional linear terminators as the line voltage increases the amount of current decreases linearly by the equation; device the Disconnect 1 and Disconnect 2 pins must be driven per Table 1. When enabled, quiescent current is 6mA and the device will respond to line demands by delivering 24mA on assertion and by imposing 2.85V on de-assertion. Disable/Sleep Mode Disable/Sleep mode can be used for power conservation or to remove the terminator from the SCSI chain. The IMP5218 is disabled when both disconnect pins are driven logic LOW. Disable mode places the device in a sleep state, where quiescent current is typically 375A. When disabled, all outputs are in a high impedance state and each output has only 3pF of capacitance. An additional feature of the IMP5218 is its compatibility with active negation drivers. (VREF - VLINE) = I. R The IMP5218, with its unique new architecture, applies the maximum amount of current regardless of line voltage until the termination high threshold (2.85V) is reached. Acting as a near ideal line terminator, the IMP5218 closely reproduces the optimum case when the device is enabled. To enable the 4 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP51 1 1/51 1 2 IMP52 8 Application Information Table 1. Power Up/ Power Down Function Table DISCONNECT 1 H H L L Open DISCONNECT 2 H L H L Open Outputs Enabled Enabled Enabled Disabled/High Impedance Enabled Quiescent Current 6mA 6mA 6mA 375A 6mA 5218_t04.eps Typical Characteristics Figure 4. Receiving Waveform 3.5 Frequency = 1.03844MHz 3.0 2.5 3.0 2.5 3.5 Frequency = 1.00266MHz Figure 5. Driving Waveform Line Voltage (V) 2.0 1.5 1.0 0.5 GND -0.5 Line Voltage (V) Time (250ns/Div.) 2.0 1.5 1.0 0.5 GND -0.5 5218_04.eps Time (250ns/Div.) 5218_05.eps Receiver Figure 4 6 Meter, 92 IMP5218 75C08 Driver Figure 5 IMP5218 75C08 5218_06.eps Figure 6. End-Driven Cable (c) 2000 IMP, Inc. Data Communications 5 IMP51 1 1/51 1 2 IMP52 8 Typical Characteristics Figure 7. Receiving Waveform 3.5 Frequency = 5.0092MHz 3.0 2.5 3.0 2.5 3.5 Frequency = 4.9961MHz Figure 8. Driving Waveform Line Voltage (V) 2.0 1.5 1.0 0.5 GND -0.5 Line Voltage (V) Time (50ns/Div.) 2.0 1.5 1.0 0.5 GND -0.5 5218_07.eps Time (50ns/Div.) Driver Figure 8 6 Meter, 92 5218_08.eps Receiver Figure 7 IMP5218 75C08 75C08 IMP5218 5218_09.eps Figure 9. End-Driven Cable Figure 10. 10MHz Waveform 4 3 2 Ch2 Frequency = 10.096MHz 4 3 2 #1 Figure 11. 20MHz Waveform Ch2 Frequency = 20.020MHz #2 #1 Line Voltage (V) 1 0 4 Line Voltage (V) #2 1 0 4 #3 2 GND #3 2 GND Time (20ns/Div.) 4.75V 5218_10.eps Time (10ns/Div.) 4.75V 5218_11.eps #1 IMP5218 6 Meter, 72 #2 IMP5218 #3 5218_12.eps Figure 12. End-Driven Cable 6 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP51 1 1/51 1 2 IMP52 8 Typical Characteristics Figure 13. Output High Voltage vs. Junction Temperature 4.5 Figure 14. Output Current vs. Junction Temperature 30 VT = 4.75V Output High Voltage (V) 4.0 25 3.5 Output Current (mA) 0 25 50 75 100 125 5218_13.eps 20 3.0 15 2.5 10 2.0 5 0 25 50 75 100 125 5218_14.eps Junction Temperature (C) Junction Temperature (C) Figure 15. Output Current vs. Output High Voltage 25 VT = 4.75V VA = 25C 20 Figure 16. Output Current vs. Output High Voltage 25 VT = 3.3V VA = 25C 20 Output Current (mA) 15 Output Current (mA) 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 15 10 10 5 5 0 0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 Output High Voltage (V) 5218_15.eps Output High Voltage (V) 5218_16.eps Figure 17. TermPwr Supply Current vs. Termination Voltage 7 Figure 18. TermPwr Supply Current vs. Termination Voltage (Disabled) 400 TermPwr Supply Current (mA) TermPwr Supply Current (A) 3.0 3.5 4.0 4.5 5.0 5.5 6.0 5218_17.eps 6 5 4 3 2 1 0 2.5 350 300 250 200 150 100 50 0 0 1 2 3 4 5 6 5218_18.eps Termination Voltage (V) (c) 2000 IMP, Inc. Termination Voltage (V) Data Communications 7 IMP51 1 1/51 1 2 IMP52 8 Typical Characteristics Figure 19. Output High Voltage vs. Junction Temperature 4.5 VT = 3.3V Figure 20. Output Current vs. Junction Temperature 30 VT = 3.3V 25 Output High Voltage (V) 4.0 3.5 Output Current (mA) 0 25 50 75 100 125 5218_19.eps 20 3.0 15 2.5 10 2.0 5 0 25 50 75 100 125 5218_20.eps Junction Temperature (C) Junction Temperature (C) Figure 21. Output High Voltage vs. Termination Voltage 4.0 3.5 Figure 22. Output Current vs. Termination Voltage 25 Output High Voltage (V) 3.0 2.5 2.0 1.5 1.0 0.5 0 3.0 Output High Voltage (V) 3.5 4.0 4.5 5.0 5.5 6.0 5218_21.eps 20 15 10 5 0 3.0 3.5 4.0 4.5 5.0 5.5 6.0 5218_22.eps VTERM Voltage (V) VTERM Voltage (V) 8 408-432-9100/www.impweb.com (c) 2000 IMP, Inc. IMP51 1 1/51 1 2 IMP52 8 Typical Characteristics 24 23.5 23 Io (mA) 22.5 22 23.5 - 24 23 - 23.5 22.5 - 23 22 - 22.5 21.5 - 22 21 - 21.5 21.5 i6 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 i0 Part # 21 22 23 24 25 i2 i4 i8 Channel Figure 23. Output Current Matching Channel to Channel 5V 2.2F TERM POWER V TERM HOST PERIPHERAL TERM POWER V TERM 5V 2.2F DISC1 DB (0) DB (1) ~~ DB (0) DB (1) DB (6) DB (7) DB (P) IMP5218 DISC1 ~~~ IMP5218 DISC2 DB (6) DB (7) DB (P) DISC2 TERMPWR VTERM TERMPWR ATN BSY TERMPWR ATN BSY TERMPWR V TERM ~~ SCSI CABLE DISC1 DISC1 ~~~ IMP5218 DISC2 ACK RST MSG ACK RST MSG IMP5218 DISC2 Note: Add third IMP5218 for 16-bit SCSI Figure 24. 8-Bit SCSI System Application (c) 2000 IMP, Inc. Data Communications 9 IMP51 1 1/51 1 2 IMP52 8 Package Dimensions SOWB (16-Pin) Inches Min A A1 B C D E e H L M *LC Millimeters Max SOWB (16-Pin) Min Max E H D M A C e B A1 L 16-Pin (SOWB).eps 0.093 0.104 0.004 0.012 0.013 0.020 0.009 0.013 0.398 0.413 0.291 0.299 0.05 BSC 0.394 0.419 0.016 0.050 0 8 -- 0.004 2.35 2.65 0.10 0.30 0.33 0.51 0.23 0.32 10.10 10.50 7.40 7.60 1.27 BSC 10.00 10.65 0.40 1.27 0 8 -- 0.10 TSSOP (20-Pin) TSSOP (20-Pin) E P 1 2 3 D F A SEATING PLANE B H L E A 0.033 0.037 -- 0.90 B 0.007 0.012 0.18 0.30 C 0.0035 0.008 0.90 0.180 D 0.252 0.260 6.40 6.60 E 0.169 0.177 4.30 4.48 F 0.025 BSC 0.65 BSC G 0.002 0.005 0.05 0.15 H -- 0.0433 -- 1.10 L 0.020 0.028 0.50 0.70 M 0 8 0 8 P 0.246 0.256 6.25 6.50 *LC -- 0.004 -- 0.10 5218_t06.at3 * Lead Coplanarity* JEDEC Drawing ___________ M C 20-Pin (TSSOP).eps G IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-432-1085 e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners. (c) 2000 IMP, Inc. Printed in USA Publication #: 7011 Revision: D Issue Date: 07/31/00 Type: Preliminary |
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