DS8838 Quad Unified Bus Transceiver General Description Features The DS8838 is a quad high speed driver/receiver designed for use in bus organized data transmission systems interconnected by terminated 120Ω impedance lines. The external termination is intended to be 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 hysteresis to greatly enhance bus noise immunity. One two-input NOR gate is included to disable all drivers in a package simultaneously. Receiver performance is optimized for systems with bus rise and fall times ≤ 1.0 µs/V. n n n n n n n n n 4 totally separate driver/receiver pairs per package 1V typical receiver input hysteresis Receiver hysteresis independent of receiver output load Guaranteed minimum bus noise immunity of 1.3V, 2V typ. Temperature-insensitive receiver thresholds track bus logic levels 20 µA typical bus terminal current with normal VCC or with VCC = 0V Open collector driver output allows wire-OR connection High speed Series 74 TTL compatible driver and disable inputs and receiver outputs Typical Application DS005812-1 © 1999 National Semiconductor Corporation DS005812 www.national.com DS8838 Quad Unified Bus Receiver May 1999 Connection Diagram Dual-In-Line Package DS005812-2 Top View Order Number DS7838J, DS8838M or DS8838N See NS Package Number J16A, M16A or N16A www.national.com 2 Molded DIP Package: 1362 mW SO Package: 1002 mW 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 Input and Output Voltage Storage Temperature Range Lead Temperature, (Soldering, 4 sec.) Operating Conditions Operating Temperature Range Supply Voltage (VCC) 7V 5.5V −65˚C to +150˚C 260˚C 0˚C to +70˚C 4.75V ≤ VCC ≤ 5.25V Note 1: Derate cavity package 9.6 mW/˚C above 25˚C; derate molded DIP package 10.9 mW/˚C above 25˚C; derate SO package 8.01 mW/˚C above 25˚C. Maximum Power Dissipation (Note 1) at 25˚C Cavity Package: 1433 mW Electrical Characteristics The following apply for VMIN ≤ VCC ≤ VMAX, TMIN ≤ TA ≤ TMAX, unless otherwise specified (Notes 3, 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, IOL = 16 mA, VCC = Max VIND = 0.8V, VOH = −400 µA, VCC = Min 0.4 0.7 V 20 100 µA 2 100 µA 1.80 2.25 2.50 V 1.05 1.30 1.55 V 0.25 0.4 V −55 mA 50 70 mA RECEIVER OUTPUT VOH Logical “1” Output Voltage VOL Logical “0” Output Voltage IOS Output Short Circuit Current ICC Supply Current tpd Propagation Delays (Note 9) 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) 2.4 V −18 Disable to Bus “1” (Note 6) 19 30 ns Disable to Bus “0” (Note 6) 15 23 ns Driver Input to Bus “1” (Note 6) 17 25 ns Driver Input to Bus “0” (Note 6) 9 15 ns Bus to Logical “1” Receiver Output (Note 7) 20 30 ns Bus to Logical “0” Receiver Output (Note 8) 18 30 ns Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” 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 −55˚C to +125˚C temperature range for the DS7838 and across the 0˚C to +70˚C range for the DS8838. 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 3.0V pulse. Note 7: Fan-out of 10 load, CLOAD = 15 pF total. Measured from VIN = 1.3V to VOUT = 1.5V, VIN = 0V to 3.0V pulse. Note 8: Fan-out of 10 load, CLOAD = 15 pF total. Measured from VIN = 2.3V to VOUT = 1.5V, VIN = 0V to 3.0V pulse. Note 9: These apply for VCC = 5V, TA = 25˚C unless otherwise speicified. 3 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted SO Package (M) Order Number DS8838M NS Package Number M16A Molded Dual-In-Line Package (N) Order Number DS8838N NS Package Number N16A www.national.com 4 DS8838 Quad Unified Bus Receiver Notes 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: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français 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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