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 DS8641 Quad Unified Bus Transceiver
January 1996
DS8641 Quad Unified Bus Transceiver
General Description
The DS8641 is a quad high speed drivers/receivers designed for use in bus organized data transmission systems interconnected by terminated 120 impedance lines. The external termination is intended to be a 180 resistor from the bus to the +5V logic supply together with a 390 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.
Features
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 A 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
(c) 1999 National Semiconductor Corporation
DS005806
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Typical Application
DS005806-2
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2
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Input and Output Voltage 5.5V Storage Temperature Range -65C to +150C Maximum Power Dissipation (Note 1) at 25C Cavity Package 1433 mW Molded Package 1362 mW
Lead Temperature (Soldering, 4 seconds)
260C
Operating Conditions
Min Supply Voltage, (VCC) DS8641 Temperature Range, (TA) DS8641 4.75 0 Max 5.25 +70 Units V C
Note 1: Derate molded package 10.9 mW/C above 25C.
Electrical Characteristics
The following apply for VMIN VCC VMAX, TMIN TA TMAX unless otherwise specified (Note 3) and (Note 4) Symbol VIH VIL II IIH IIL VCL Parameter Logical "1" Input Voltage Logical "0" Input Voltage Logical "1" Input Current Logical "1" Input Current Logical "0" Input Current Input Diode Clamp Voltage VIN = 5.5V VIN = 2.4V VIN = 0.4V IDIS = -12 mA, IIN = -12 mA, IBUS = -12 mA, TA = 25C 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 A VIN = 0.8V, VBUS = 0.5V, IOH = -400 A 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) 1.70 -1 Conditions Min 2.0 0.8 1 40 -1.6 -1.5 Typ Max Units V V mA A mA V DRIVER AND DISABLE INPUTS
DRIVER OUTPUT/RECEIVER INPUT VOLB IIHB IILB VIH VIL VOH VOL IOS ICC Low Level Bus Voltage Maximum Bus Current Maximum Bus Current High Level Receiver Threshold Low Level Receiver Threshold Logical "1" Output Voltage Logical "0" Output Voltage Output Short Circuit Current Supply Current 0.4 30 2 1.50 1.50 2.4 0.25 -18 50 0.4 -55 70 1.30 0.7 100 100 V A A V V V V mA mA
RECEIVER OUTPUT
3
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Switching Characteristics
TA = 25C, VCC = 5V, unless otherwise indicated Symbol tPD Parameter Propagation Delays (Note 8) Disable to Bus "1" Disable to Bus "0" Driver Input to Bus "1" Driver Input to Bus "0" Bus to Logical "1" Receiver Output Bus to Logical "0" Receiver Output (Note 7) Conditions (Note 6) 19 15 17 17 20 18 30 30 25 25 30 30 ns ns ns ns ns ns Min Typ Max Units
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 0C to +70C range for the DS8641. All typical values are for TA = 25C 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: 91 from bus pin to VCC and 200 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 = 25C unless otherwise specified.
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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.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.


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