IMP51IMP52 1 1/51 1 28 DATA COMMUNICATIONS 9-Line Plug and Play SCSI Terminator Key Features 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. ◆ SCSI plug and play — Dual disconnect pins — Logic LOW disconnects lines ◆ Hot swap compatible ◆ Ultra-Fast response for Fast-20 SCSI applications ◆ 35MHz channel bandwidth ◆ 3.5V operation ◆ Less than 3pF output capacitance ◆ 375µA disable-mode current ◆ 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 IMP5218 can be placed in a sleep mode with two disconnect signals. When disabled, the quiescent current is typically 375µA, and the outputs are in a high impedance state. Block Diagrams Term Power Thermal Limiting Circuit Current Biasing Circuit 24mA Current Limiting Circuit DATA OUTPUT PIN DB (0) 2.85V DISCONNECT 1 1 of 9 Channels DISCONNECT 2 5218_01.eps Daily Silver IMP Data Communications 1 IMP51IMP52 1 1/51 1 28 Pin Configuration SOWB-16 TERM POWER 1 NC 2 D0 3 D1 4 D2 5 D3 6 TSSOP-20 TERM POWER 1 20 TERM POWER 15 DISCONNECT 1 NC 2 19 DISCONNECT 1 14 DISCONNECT 2 NC 3 18 DISCONNECT 2 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 16 TERM POWER IMP5218 D4 7 10 D5 GND 8 9 DW Package GND 5218_02.eps IMP5218 GND 10 16 D7 11 GND PW Package 5218_02a.eps Ordering Information Part Number Temperature Range Package IMP5218CDW 0°C to 125°C 16-pin Plastic SOWB IMP5218CDWT 0°C to 125°C Tape and Reel, 16-pin Plastic SOWB IMP5218CPW 0°C to 125°C 20-pin Plastic TSSOP IMP5218CPWT 0°C to 125°C 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 . . . . . . . . . . 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 www.ds-imp.com.cn Daily Silver IMP IMP51IMP52 1 1/51 1 28 Recommended Operating Conditions2 Max Units 3.5 5.5 V VIH 2 VTERM V VIL 0 0.8 V 0 125 °C Symbol Min VTERM High Level Disable Input Voltage Low Level Disable Input Voltage Parameter Termpwr Voltage Operating Junction Temperature Range Note: Typ 5218_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 Units V All data lines = Open 6 9 mA All data lines = 0.5V 215 225 mA µA –24 DISCONNECT Pins 1, 2 = 0V Output Current Max 375 Disable Input Current IIN DISCONNECT Pins 1, 2 = 4.75V 90 mA µA DISCONNECT Pins 1, 2 = 0V –10 µA Output Leakage Current IOL DISCONNECT Pins = 0V, VO = 0.5V 10 nA VOUT = 0V, Frequency = 1MHz 3 pF 35 MHz Capacitance in Disabled Mode COUT Channel Bandwidth BW Termination Sink Current, per Channel ISINK –21 VOUT = 0.5V VOUT = 4V –23 60 mA 5218_t03.eps Daily Silver IMP Data Communications 3 IMP51IMP52 1 1/51 1 28 Application Information Figure 1. Receiving Waveform – 20MHz Figure 2. Driving Waveform – 20MHz Receiver Driver 1 Meter, AWG 28 IMP5218 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 110Ω) are a compromise. With coventional linear terminators as the line voltage increases the amount of current decreases linearly by the equation; (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 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 375µA. 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. www.ds-imp.com.cn Daily Silver IMP IMP51IMP52 1 1/51 1 28 Application Information Table 1. Power Up/ Power Down Function Table DISCONNECT 1 DISCONNECT 2 Outputs Quiescent Current H H Enabled 6mA H L Enabled 6mA L H Enabled 6mA L L Disabled/High Impedance 375µA Open Open Enabled 6mA 5218_t04.eps 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.) 5218_04.eps Receiver Figure 4 5218_05.eps Driver Figure 5 6 Meter, 92Ω IMP5218 IMP5218 75C08 75C08 5218_06.eps Figure 6. End-Driven Cable Daily Silver IMP Data Communications 5 IMP51IMP52 1 1/51 1 28 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.) 5218_07.eps Receiver Figure 7 5218_08.eps Driver Figure 8 6 Meter, 92Ω IMP5218 IMP5218 75C08 75C08 5218_09.eps Figure 9. End-Driven Cable Figure 10. 10MHz Waveform 4 Ch2 Frequency = 10.096MHz 3 3 2 2 #2 1 Line Voltage (V) Line Voltage (V) 4 Figure 11. 20MHz Waveform #1 0 4 #3 #2 #1 1 0 4 #3 2 2 GND GND Time (20ns/Div.) Ch2 Frequency = 20.020MHz Time (10ns/Div.) 5218_10.eps 4.75V 5218_11.eps 4.75V #1 6 Meter, 72Ω #2 IMP5218 IMP5218 #3 5218_12.eps Figure 12. End-Driven Cable 6 www.ds-imp.com.cn Daily Silver IMP IMP51IMP52 1 1/51 1 28 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) 20 Output Current (mA) 5218_14.eps Figure 16. Output Current vs. Output High Voltage 25 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 1.2 1.6 2.0 2.4 2.8 3.2 5218_16.eps Figure 18. TermPwr Supply Current vs. Termination Voltage (Disabled) 6 350 TermPwr Supply Current (µA) 400 5 4 3 2 1 300 250 200 150 100 50 0 3.0 3.5 4.0 4.5 5.0 Termination Voltage (V) Daily Silver IMP 0.8 5218_15.eps 7 0 2.5 0.4 Output High Voltage (V) Figure 17. TermPwr Supply Current vs. Termination Voltage TermPwr Supply Current (mA) 125 Junction Temperature (°C) 5218_13.eps 5.5 6.0 5218_17.eps 0 1 2 3 4 Termination Voltage (V) Data Communications 5 6 5218_18.eps 7 IMP51IMP52 1 1/51 1 28 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 www.ds-imp.com.cn 0 3.0 3.5 4.0 4.5 5.0 VTERM Voltage (V) 5.5 6.0 5218_22.eps Daily Silver IMP IMP51IMP52 1 1/51 1 28 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 8 9 10 11 12 13 14 15 16 17 18 19 20 i0 Part # 21 22 23 24 25 i2 Channel Figure 23. Output Current Matching Channel to Channel HOST TERM POWER 2.2µF TERM POWER VTERM VTERM DB (0) DB (1) ~ ~ 5V PERIPHERAL DB (0) DB (1) 2.2µF DISC1 DISC1 TERMPWR DB (6) DB (7) DB (P) DB (6) DB (7) DB (P) ~ ~ ~ IMP5218 DISC2 TERMPWR DISC2 TERMPWR VTERM ~ ~ ATN BSY ATN BSY SCSI CABLE DISC1 DISC1 ACK RST MSG ACK RST MSG ~ ~ ~ IMP5218 IMP5218 TERMPWR VTERM DISC2 5V IMP5218 DISC2 Note: Add third IMP5218 for 16-bit SCSI Figure 24. 8-Bit SCSI System Application Daily Silver IMP Data Communications 9 IMP51IMP52 1 1/51 1 28 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 0.104 0.093 0.012 0.004 0.020 0.013 0.009 0.013 0.413 0.398 0.291 0.299 0.05 BSC 0.394 0.419 0.050 0.016 0° 8° — 0.004 2.65 2.35 0.30 0.10 0.51 0.33 0.23 0.32 10.50 10.10 7.40 7.60 1.27 BSC 10.00 10.65 1.27 0.40 0° 8° — 0.10 TSSOP (20-Pin) TSSOP (20-Pin) E 1 2 0.90 — 0.037 0.033 A 0.30 0.18 0.012 0.007 B C 0.0035 0.008 0.90 0.180 D 0.252 0.260 6.40 6.60 4.48 4.30 0.177 0.169 E 0.65 BSC 0.025 BSC F 0.15 0.05 0.005 0.002 G 1.10 — 0.0433 — H 0.70 0.50 0.028 0.020 L M 0° 8° 0° 8° 6.50 6.25 0.256 0.246 P 0.10 — 0.004 — *LC 5218_t06.at3 * Lead Coplanarity* JEDEC Drawing ___________ P 3 E D F A SEATING PLANE B G H L M C 20-Pin (TSSOP).eps Daily Silver IMP Microelectronics Co.,Ltd 7 Keda Road , Hi-Tech Park, NingBo,Zhejiang, P.R.C. Post Code : 315040 Tel:(086)-574-87906358 Fax:(086)-574-87908866 e-mail:[email protected] http://www.ds-imp.com.cn The IMP logo is a registered trademark of Daily Silver IMP. All other company and product names are trademarks of their respective owners. 2005 Daily Silver IMP Revision : A Issue Date: 08 / 08 / 05 Type: Product