DS8641 Quad Unified Bus Transceiver General Description Features The DS8641 is a quad high speed drivers/receivers designed for use in bus organized data transmission systems interconnected by terminated 120Ω impedance lines. The external termination is intended to be a 180Ω resistor from the bus to the +5V logic supply together with a 390Ω resistor from the bus to ground. The bus can be terminated at one or both ends. Low bus pin current allows up to 27 driver/ receiver pairs to utilize a common bus. The bus loading is unchanged when VCC = 0V. The receivers incorporate tight thresholds for better bus noise immunity. One two-input NOR gate is included to disable all drivers in a package simultaneously. n 4 separate driver/receiver pairs per package n Guaranteed minimum bus noise immunity of 0.6V, 1.1V typ n Temperature insensitive receiver thresholds track bus logic levels n 30 µA typical bus terminal current with normal VCC or with VCC = 0V n Open collector driver output allows wire-OR connection n High speed n Series 74 TTL compatible driver and disable inputs and receiver outputs Connection Diagram Dual-In-Line Package DS005806-1 Top View Order Number DS8641N See NS Package Number N16A © 1999 National Semiconductor Corporation DS005806 www.national.com DS8641 Quad Unified Bus Transceiver January 1996 Typical Application DS005806-2 www.national.com 2 Absolute Maximum Ratings (Note 2) Lead Temperature (Soldering, 4 seconds) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Operating Conditions Supply Voltage 7V Input and Output Voltage 5.5V Storage Temperature Range −65˚C to +150˚C Maximum Power Dissipation (Note 1) at 25˚C Cavity Package 1433 mW Molded Package 1362 mW Supply Voltage, (VCC) DS8641 Temperature Range, (TA) DS8641 260˚C Min Max Units 4.75 5.25 V 0 +70 ˚C Note 1: Derate molded package 10.9 mW/˚C above 25˚C. Electrical Characteristics The following apply for VMIN ≤ VCC ≤ VMAX, TMIN ≤ TA ≤ TMAX unless otherwise specified (Note 3) and (Note 4) Symbol Parameter Conditions Min Typ Max Units DRIVER AND DISABLE INPUTS VIH Logical “1” Input Voltage VIL Logical “0” Input Voltage II Logical “1” Input Current IIH Logical “1” Input Current IIL Logical “0” Input Current VCL Input Diode Clamp Voltage 2.0 V VIN = 5.5V VIN = 2.4V VIN = 0.4V IDIS = −12 mA, IIN = −12 mA, IBUS = −12 mA, TA = 25˚C −1 0.8 V 1 mA 40 µA −1.6 mA −1.5 V DRIVER OUTPUT/RECEIVER INPUT VOLB Low Level Bus Voltage IIHB Maximum Bus Current IILB Maximum Bus Current VIH High Level Receiver Threshold VIL Low Level Receiver Threshold VDIS = 0.8V, VIN = 2V, IBUS = 50 mA VIN = 0.8V, VBUS = 4V, VCC = VMAX VIN = 0.8V, VBUS = 4V, VCC = 0V VIND = 0.8V, VOL = 16 mA VIND = 0.8V, VOH = −400 µA 1.70 0.4 0.7 V 30 100 µA 2 100 µA 1.50 1.30 V 0.25 0.4 V −55 mA 70 mA 1.50 V RECEIVER OUTPUT VOH Logical “1” Output Voltage VOL Logical “0” Output Voltage IOS Output Short Circuit Current ICC Supply Current VIN = 0.8V, VBUS = 0.5V, IOH = −400 µA VIN = 0.8V, VBUS = 4V, IOL = 16 mA VDIS = 0.8V, VIN = 0.8V, VBUS = 0.5V, VOS = 0V, VCC = VMAX, (Note 5) VDIS = 0V, VIN = 2V, (per Package) 3 2.4 V −18 50 www.national.com Switching Characteristics TA = 25˚C, VCC = 5V, unless otherwise indicated Symbol tPD Parameter Typ Max Units Disable to Bus “1” 19 30 ns Disable to Bus “0” 15 30 ns Driver Input to Bus “1” 17 25 ns Driver Input to Bus “0” 17 25 ns 20 30 ns 18 30 ns Propagation Delays (Note 8) Bus to Logical “1” Receiver Output Conditions Min (Note 6) (Note 7) Bus to Logical “0” Receiver Output Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation. Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS8641. All typical values are for TA = 25˚C and VCC = 5V. Note 4: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 5: Only one output at a time should be shorted. Note 6: 91Ω from bus pin to VCC and 200Ω from bus pin to ground. CLOAD = 15 pF total. Measured from VIN = 1.5V to VBUS = 1.5V, VIN = 0V to 3V pulse. Note 7: Fan-out of 10 load, CLOAD = 15 pF total. Measured from VIN = 1.5V to VOUT = 1.5V, VIN = 0V to 3V pulse. Note 8: The following apply for VCC = 5V, TA = 25˚C unless otherwise specified. www.national.com 4 DS8641 Quad Unified Bus Transceiver Physical Dimensions inches (millimeters) unless otherwise noted Molded Dual-In-Line Package (N) Order Number DS8641N NS Package Number N16A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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