IMP51IMP52 1 1/51 1 29 DATA COMMUNICATIONS 9-Line SCSI Terminator Key Features The 9-channel IMP5219 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. 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 IMP5219. The IMP5219 architecture tolerates marginal system designs. A key improvement offered by the IMP5219 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. Ultra-Fast response for Fast-20 SCSI applications Hot swap compatible 35MHz channel bandwidth 3.5V operation Less than 3pF output capacitance Sleep-mode current less than 375µA Thermally self limiting No external compensation capacitors Implements 8-bit or 16-bit (wide) applications Compatible with active negation drivers (60ma/channel) ◆ Compatible with passive and active terminations ◆ Approved for use with SCSI 1, 2, 3 and UltraSCSI ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ ◆ For portable and configurable peripherals, the IMP5219 can be placed in a sleep mode with an active LOW disable signal. Quiescent current is typically 375µA and output are in a high impedance state when disabled. Block Diagrams Term Power Thermal Limiting Circuit Current Biasing Circuit 24mA Current Limiting Circuit DATA OUTPUT PIN DB (0) 2.85V Disable Pin – 1 of 9 Channels + 1.4V 5219_01.eps © 2000 IMP, Inc. Data Communications 1 IMP51IMP52 1 1/51 1 29 Pin Configuration SOWB-16 TSSOP-20 TERM POWER 1 20 TERM POWER 15 NC NC 2 19 DISABLE 14 DISABLE NC 3 18 NC 13 D8 D0 4 17 D8 12 D7 D1 5 11 D6 D2 6 15 NC D3 7 14 D6 D4 8 13 D5 NC 9 12 NC TERM POWER 1 16 TERM POWER NC 2 D0 3 D1 4 D2 5 D3 6 IMP5219 D4 7 10 D5 GND 8 9 DW Package GND 5219_02.eps IMP5219 GND 10 16 D7 11 GND PW Package 5219_02a.eps Ordering Information Part Number Temperature Range Package IMP5219CDW 0°C to 125°C 16-pin Plastic SOWB IMP5219CDWT 0°C to 125°C Tape and Reel, 16-pin Plastic SOWB IMP5219CPW 0°C to 125°C 20-pin Plastic TSSOP IMP5219CPWT 0°C to 125°C Tape and Reel, 20-pin Plastic TSSOP 5219_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 . . . . . . . . . . 0°C to 125°C Storage Temperature Range . . . . . . . . . . . . . . –65°C to 150°C Lead Temperature (Soldering, 10 sec.) . . . . . . 300°C 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, θJA . . . . . . 95°C/W PW Package: Thermal Resistance Junction-to-Ambient, θJA . . . . . . 144°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA 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 © 2000 IMP, Inc. IMP51IMP52 1 1/51 1 29 Recommended Operating Conditions2 Parameter Symbol Min VTERM High Level Disable Input Voltage Low Level Disable Input Voltage Termpwr Voltage Max Units 3.5 5.5 V VIH 2 VTERM V VIL 0 0.8 V 0 125 °C Operating Junction Temperature Range Note: Typ 5219_t02.eps 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 = 25°C. 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 Min Typ 2.65 2.85 IOUT Disable Input Current IIN Output Leakage Current IOL Capacitance in Disabled Mode COUT Channel Bandwidth BW Termination Sink Current, per Channel ISINK Units V All data lines = Open 6 9 mA All data lines = 0.5V 215 225 mA µA –24 mA Disable < 0.8V Output Current Max VOUT = 0.5V 375 –21 –23 Disable = 4.75V 10 Disable = 0V –90 nA µA Disable = 0.8V, VO = 0.5V 10 nA VOUT = 0V, Frequency = 1MHz 3 pF 35 MHz VOUT = 4V 60 mA 5219_t03.eps © 2000 IMP, Inc. Data Communications 3 IMP51IMP52 1 1/51 1 29 Application Information Figure 1. Receiving Waveform – 20MHz Figure 2. Driving Waveform – 20MHz Receiver Driver 1 Meter, AWG 28 IMP5219 IMP5219 5219_03.eps Figure 3. IMP5219 Maximizes Line Current Disable/Sleep Mode 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 110Ω) are a compromise. With coventional linear terminators as the line voltage increases the amount of current decreases linearly by the equation; Disable mode places the device in a sleep state, where quiescent current typically 375µA. When disabled, all outputs are in a high impedance state and output capacitance is a low 3pF. Sleep mode can be used for power conservation or to remove the terminator from the SCSI chain. An additional feature of the IMP5219 is its compatibility with active negation drivers. Table 1. Power Up/ Power Down Function Table (VREF − VLINE) = I. R Disable Outputs Quiescent Current The IMP5219, with its unique new architecture, applies the maximum amount of current regardless of line voltage until the termination high threshold (2.85V) is reached. H Enabled 6mA L Disable/High Impedance 375µA Acting as a near ideal line terminator, the IMP5219 closely reproduces the optimum case when the device is enabled. To enable the device the Disable pin must be driven HIGH or left Open. 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. Open Enabled 6mA 4 408-432-9100/www.impweb.com 5219_t04.eps © 2000 IMP, Inc. IMP51IMP52 1 1/51 1 29 Typical Characteristics Figure 4. Receiving Waveform Figure 5. Driving Waveform 3.5 3.5 Frequency = 1.00266MHz 3.0 2.5 2.5 Line Voltage (V) Line Voltage (V) Frequency = 1.03844MHz 3.0 2.0 1.5 1.0 2.0 1.5 1.0 0.5 0.5 GND GND –0.5 –0.5 Time (250ns/Div.) Time (250ns/Div.) 5219_04.eps Receiver Figure 4 5219_05.eps Driver Figure 5 6 Meter, 92Ω IMP5219 IMP5219 75C08 75C08 5219_06.eps Figure 6. End-Driven Cable © 2000 IMP, Inc. Data Communications 5 IMP51IMP52 1 1/51 1 29 Typical Characteristics Figure 7. Receiving Waveform Figure 8. Driving Waveform 3.5 3.5 Frequency = 4.9961MHz 3.0 2.5 2.5 Line Voltage (V) Line Voltage (V) Frequency = 5.0092MHz 3.0 2.0 1.5 1.0 2.0 1.5 1.0 0.5 0.5 GND GND –0.5 –0.5 Time (50ns/Div.) Time (50ns/Div.) 5219_07.eps Receiver Figure 7 5219_08.eps Driver Figure 8 6 Meter, 92Ω IMP5219 IMP5219 75C08 75C08 5219_09.eps Figure 9. End-Driven Cable Figure 10. 10MHz Waveform Figure 11. 20MHz Waveform 4 Ch2 Frequency = 10.096MHz 3 3 2 2 #2 1 Line Voltage (V) Line Voltage (V) 4 #1 0 4 #3 #1 #2 1 0 4 #3 2 2 GND GND Time (20ns/Div.) Ch2 Frequency = 20.020MHz Time (10ns/Div.) 5219_10.eps 4.75V 5219_11.eps 4.75V #1 6 Meter, 72Ω #2 IMP5219 IMP5219 #3 5219_12.eps Figure 12. End-Driven Cable 6 408-432-9100/www.impweb.com © 2000 IMP, Inc. IMP51IMP52 1 1/51 1 29 Typical Characteristics Figure 13. Output High Voltage vs. Junction Temperature Figure 14. Output Current vs. Junction Temperature 4.5 30 4.0 25 Output Current (mA) Output High Voltage (V) VT = 4.75V 3.5 3.0 2.5 20 15 10 2.0 5 0 25 50 75 100 125 Junction Temperature (°C) 0 25 Figure 15. Output Current vs. Output High Voltage 50 75 100 25 VT = 4.75V VA = 25°C VT = 3.3V VA = 25°C 20 Output Current (mA) Output Current (mA) 20 15 10 5 15 10 5 0 0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 Output High Voltage (V) 3.2 0 0.8 5219_15.eps 1.2 1.6 2.0 2.4 2.8 3.2 5219_16.eps Figure 18. TermPwr Supply Current vs. Termination Voltage (Disabled) 7 500 450 TermPwr Supply Current (µA) 6 5 4 3 2 1 0 2.5 0.4 Output High Voltage (V) Figure 17. TermPwr Supply Current vs. Termination Voltage TermPwr Supply Current (mA) 5219_14.eps Figure 16. Output Current vs. Output High Voltage 25 400 350 300 250 200 150 100 50 0 3.0 3.5 4.0 4.5 5.0 Termination Voltage (V) © 2000 IMP, Inc. 125 Junction Temperature (°C) 5219_13.eps 5.5 6.0 5219_17.eps 0 1 2 3 4 Termination Voltage (V) Data Communications 5 6 5219_18.eps 7 IMP51IMP52 1 1/51 1 29 Typical Characteristics Figure 19. Output High Voltage vs. Junction Temperature Figure 20. Output Current vs. Junction Temperature 4.5 30 VT = 3.3V 4.0 25 Output Current (mA) Output High Voltage (V) VT = 3.3V 3.5 3.0 2.5 20 15 10 2.0 5 0 25 50 75 100 Junction Temperature (°C) 125 0 25 5218_19.eps Figure 21. Output High Voltage vs. Termination Voltage 50 75 100 Junction Temperature (°C) 125 5218_20.eps Figure 22. Output Current vs. Termination Voltage 25 4.0 Output High Voltage (V) Output High Voltage (V) 3.5 3.0 2.5 2.0 1.5 1.0 20 15 10 5 0.5 0 3.0 3.5 4.0 4.5 5.0 VTERM Voltage (V) 8 5.5 6.0 5218_21.eps 408-432-9100/www.impweb.com 0 3.0 3.5 4.0 4.5 5.0 VTERM Voltage (V) 5.5 6.0 5218_22.eps © 2000 IMP, Inc. IMP51IMP52 1 1/51 1 29 Typical Characteristics 24 23.5 Io (mA) 23 23.5 – 24 23 – 23.5 22.5 – 23 22 – 22.5 21.5 – 22 21 – 21.5 22.5 22 21.5 i8 i6 21 i4 1 2 3 4 5 6 7 Channel 8 9 10 11 12 13 14 15 16 17 18 19 20 i0 Part # 21 22 23 24 25 i2 Figure 23. Output Current Matching Channel to Channel DB (0) DB (1) DB (0) DB (1) DB (6) DB (7) DB (P) DB (6) DB (7) DB (P) IMP5219 TERMPWR ACK RST MSG IMP5219 2.2µF TERMPWR VTERM ATN BSY SCSI CABLE ACK RST MSG IMP5219 DISCONNECT ~ ~ ATN BSY ~ ~ ~ VTERM TERMPWR 5V DISCONNECT VTERM IMP5219 TERMPWR DISCONNECT TERM POWER VTERM ~ ~ 2.2µF PERIPHERAL ~ ~ ~ DISCONNECT HOST TERM POWER 5V Note: Add third IMP5219 for 16-bit SCSI Figure 24. 8-Bit SCSI System Application © 2000 IMP, Inc. Data Communications 9 IMP51IMP52 1 1/51 1 29 Package Dimensions SOWB (16-Pin) Inches Min Millimeters Max Min Max SOWB (16-Pin) E H D M A C e L B A1 16-Pin (SOWB).eps A A1 B C D E e H L M *LC 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 1 2 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 ___________ P 3 E D F A SEATING PLANE B H G L M C 20-Pin (TSSOP).eps IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-432-1085 e-mail: [email protected] 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. © 2000 IMP, Inc. Printed in USA Publication #: 7012 Revision: D Issue Date: 07/31/00 Type: Preliminary