DS75160A/DS75161A/DS75162A IEEE-488 GPIB Transceivers General Description Features This family of high-speed-Schottky 8-channel bi-directional transceivers is designed to interface TTL/MOS logic to the IEEE Standard 488-1978 General Purpose Interface Bus (GPIB). PNP inputs are used at all driver inputs for minimum loading, and hysteresis is provided at all receiver inputs for added noise margin. The IEEE-488 required bus termination is provided internally with an active turn-off feature which disconnects the termination from the bus when VCC is removed. The General Purpose Interface Bus is comprised of 16 signal lines Ð 8 for data and 8 for interface management. The data lines are always implemented with DS75160A, and the management lines are either implemented with DS75161A in a single-controller system, or with DS75162A in a multicontroller system. Y Y Y Y Y Y Y Y Y Y Y 8-channel bi-directional non-inverting transceivers Bi-directional control implemented with TRI-STATEÉ output design Meets IEEE Standard 488-1978 High-speed Schottky design Low power consumption High impedance PNP inputs (drivers) 500 mV (typ) input hysteresis (receivers) On-chip bus terminators No bus loading when VCC is removed Pin selectable open collector mode on DS75160A driver outputs Accommodates multi-controller systems Connection Diagrams Dual-In-Line Package Dual-In-Line Package TL/F/5804 – 15 Order Number DS75162AWM, DS75162AN See NS Package Number M24B or N24B Dual In-Line Package TL/F/5804 – 1 Top View Order Number DS75160AN or DS75160AWM See NS Package Number M20B or N20A TL/F/5804 – 16 TRI-STATEÉ is a registered trademark of National Semiconductor Corporation. C1996 National Semiconductor Corporation TL/F/5804 Order Number DS75161AN or DS75161AWM See NS Package Number M20B or N20B RRD-B30M36/Printed in U. S. A. http://www.national.com DS75160A/DS75161A/DS75162A IEEE-488 GPIB Transceivers February 1996 Absolute Maximum Ratings (Note 1) Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. VCC, Supply Voltage Supply Voltage, VCC Input Voltage Storage Temperature Range Lead Temperature (Soldering, 4 sec.) Maximum Power Dissipation* at 25§ C Molded Package TA, Ambient Temperature IOL, Output Low Current Bus Terminal 7.0V 5.5V b 65§ C to a 150§ C 260§ C Min 4.75 Max 5.25 Units V 0 70 §C 48 16 mA mA 1897 mW *Derate molded package 15.2 mW/§ C above 25§ C. Electrical Characteristics (Notes 2 and 3) Symbol Parameter Conditions Min Typ Max Units 0.8 V VIH High-Level Input Voltage VIL Low-Level Input Voltage VIK Input Clamp Voltage VHYS Input Hysteresis Bus VOH High-Level Output Voltage Terminal IOH e b800 mA 2.7 3.5 Bus (Note 5) IOH e b5.2 mA 2.5 3.4 Low-Level Output Voltage Terminal IOL e 16 mA 0.3 0.5 Bus IOH e 48 mA 0.4 0.5 VI e 5.5V 0.2 100 VI e 2.7V 0.1 20 b 10 b 100 mA 3.0 3.7 V VOL IIH High-Level Input Current IIL Low-Level Input Current VBIAS Terminator Bias Voltage at Bus Port ILOAD Terminator Bus Loading Current 2 II e b18 mA Terminal and TE, PE, DC, SC Inputs b 0.8 400 VI e 0.5V Driver Disabled II(bus) e 0 (No Load) VI(bus) e b1.5V to 0.4V VI(bus) e 0.4V to 2.5V Bus Driver Disabled V 2.5 500 0 ICC CIN Short-Circuit Output Current Supply Current Bus-Port Capacitance Terminal V 2.5 b 3.2 VI(bus) e 3.7V to 5V 0 2.5 VI(bus) e 5V to 5.5V 0.7 2.5 Bus (Note 5) 40 b 15 b 35 b 75 b 35 b 75 b 150 Transmit, TE e 2V, PE e 2V, VI e 0.8V 85 125 Receive, TE e 0.8V, PE e 2V, VI e 0.8V 70 100 DS75161A TE e 0.8V, DC e 0.8V, VI e 0.8V 84 125 DS75162A TE e 0.8V, DC e 0.8V, SC e 2V, VI e 0.8V 85 125 Bus VCC e 5V or 0V, VI e 0V to 2V, f e 1 MHz 20 30 DS75160A V mA b 3.2 VI(bus) e 2.5V to 3.7V VI e 2V, VO e 0V (Note 4) V mV b 1.3 VCC e 0V, VI(bus) e 0V to 2.5V IOS b 1.5 mA mA mA mA pF Note 1: ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of ‘‘Electrical Characteristics’’ provides conditions for actual device operation. Note 2: Unless otherwise specified, min/max limits apply across the 0§ C to a 70§ C temperature range and the 4.75V to 5.25V power supply range. All typical values are for TA e 25§ C and VCC e 5.0V. Note 3: All currents into device pins are shown as positive; all currents out of device pins are shown as negative; all voltages are referenced to ground, unless otherwise specified. All values shown as max or min are so classified on absolute value basis. Note 4: Only one output at a time should be shorted. Note 5: This characteristic does not apply to outputs on DS75161A and DS75162A that are open collector. http://www.national.com 2 Switching Characteristics VCC e 5.0V g 5%, TA e 0§ C to 70§ C (Note 1) Symbol Parameter From To Conditions DS75160A DS75161A DS75162A Units Min Typ Max Min Typ Max Min Typ Max tPLH Propagation Delay Time, Low to High Level Output tPHL Propagation Delay Time, High to Low Level Output tPLH Propagation Delay Time, Low to High Level Output tPHL Propagation Delay Time, High to Low Level Output tPZH Output Enable Time to High Level tPHZ Output Disable Time From High Level tPZL Output Enable Time to Low Level tPLZ Output Disable Time From Low Level tPZH Output Enable Time to High Level tPHZ Output Disable Time From High Level tPZL Output Enable Time to Low Level tPLZ Output Disable Time From Low Level tPZH Output Pull-Up Enable Time (DS75160A Only) tPHZ Output Pull-UP Disable Time (DS75160A Only) Terminal Bus Bus VL e 5.0V RL e 240X Terminal CL e 30 pF Figure 2 VI e 3.0V VL e 0V RL e 480X CL e 15 pF Figure 1 TE, DC, or SC (Note 2) (Note 3) TE, DC, or SC Bus VI e 0V VL e 2.3V RL e 38.3X CL e 15 pF Figure 1 VI e 3.0V VL e 0V RL e 3 kX CL e 15 pF Terminal Figure 1 VI e 0V VL e 5V RL e 280X CL e 15 pF Figure 1 (Note 2) (Note 3) PE (Note 2) VL e 2.3V RL e 38.3X CL e 30 pF Figure 1 Bus VI e 3V VL e 0V RL e 480X CL e 15 pF Figure 1 10 20 10 20 10 20 ns 14 20 14 20 14 20 ns 14 20 14 20 14 20 ns 10 20 10 20 10 20 ns 19 32 23 40 23 40 ns 15 22 15 25 15 25 ns 24 35 28 48 28 48 ns 17 25 17 27 17 27 ns 17 33 18 40 18 40 ns 15 25 22 33 22 33 ns 25 39 28 52 28 52 ns 15 27 20 35 20 35 ns 10 17 NA NA ns 10 15 NA NA ns Note 1: Typical values are for VCC e 5.0V and TA e 25§ C and are meant for reference only. Note 2: Refer to Functional Truth Tables for control input definition. Note 3: Test configuration should be connected to only one transceiver at a time due to the high current stress caused by the VI voltage source when the output connected to that input becomes active. Switching Load Configurations TL/F/5804 – 8 VC logic high e 3.0V VC logic low e 0V VC logic high e 3.0V *CL includes jig and probe capacitance VC logic low e 0V FIGURE 1 TL/F/5804 – 9 *CL includes jig and probe capacitance FIGURE 2 3 http://www.national.com Connection Diagrams (Continued) Dual-In-Line Package TL/F/5804 – 2 Top View Dual-In-Line Package TL/F/5804 – 3 Top View Order Number DS75161AN, DS75162AN or DS75161AWM See NS Package Number M20B, N20A or N22A http://www.national.com 4 Functional Description Logic Diagrams DS75160A DS75160A This device is an 8-channel bi-directional transceiver with one common direction control input, denoted TE. When used to implement the IEEE-488 bus, this device is connected to the eight data bus lines, designated DIO1 –DIO8. The port connections to the bus lines have internal terminators, in accordance with the IEEE-488 Standard, that are deactivated when the device is powered down. This feature guarantees no bus loading when VCC e 0V. The bus port outputs also have a control mode that either enables or disables the active upper stage of the totem-pole configuration. When this control input, denoted PE, is in the high state, the bus outputs operate in the high-speed totem-pole mode. When PE is in the low state, the bus outputs operate as open collector outputs which are necessary for parallel polling. DS75161A This device is also an 8-channel bi-directional transceiver which is specifically configured to implement the eight management signal lines of the IEEE-488 bus. This device, paired with the DS75160A, forms the complete 16-line interface between the IEEE-488 bus and a single controller instrumentation system. In compliance with the system organization of the management signal lines, the SRQ, NDAC, and NRFD bus port outputs are open collector. In contrast to the DS75160A, these open collector outputs are a fixed configuration. The direction control is divided into three groups. The DAV, NDAC, and NRFD transceiver directions are controlled by the TE input. The ATN, SRQ, REN, and IFC transceiver directions are controlled by the DC input. The EOI transceiver direction is a function of both the TE and DC inputs, as well as the logic level present on the ATN channel. The port connections to the bus lines have internal terminators identical to the DS75160A. DS75162A This device is identical to the DS75161A, except that an additional direction control input is provided, denoted SC. The SC input controls the direction of the REN and IFC transceivers that are normally controlled by the DC input on the DS75161A. This additional control function is instrumental in implementing multiple controller systems. Table of Signal Line Abbreviations Signal Line Classification Control Signals Mnemonic Definition DC Direction Control PE TE Pull-Up Enable Talk Enable SC System Controller B1–B8 Bus Side of Device D1–D8 Terminal Side of Device ATN Attention DAV Data Valid EOI End or Identify Management IFC Interface Clear Signals NDAC Not Data Accepted Data I/O Ports NRFD REN SRQ Device DS75161A/ DS75162A DS75160A All DS75162A TL/F/5804 – 4 DS75160A DS75161A/ DS75162A Not Ready for Data Remote Enable Service Request 5 http://www.national.com Logic Diagrams (Continued) DS75161A DS75162A TL/F/5804–5 TL/F/5804 – 6 TL/F/5804 – 7 http://www.national.com 6 Switching Waveforms Transmit Propagation Delays TL/F/5804 – 10 Receive Propagation Delays TL/F/5804 – 11 Terminal Enable/Disable Times TL/F/5804 – 12 Bus Enable/Disable Times TL/F/5804 – 13 *Input signal: f e 1.0 MHz, 50% duty cycle, tr e tf s 5 ns Performance Characteristics Bus Port Load Characteristics TL/F/5804 – 14 Refer to Electrical Characteristics table 7 http://www.national.com Functional Truth Tables DS75160A Control Input Level Data Transceivers TE PE Direction Bus Port Configuration H H L H L X T T R Totem-Pole Output Open Collector Output Input DS75161A Control Input Level TE DC H H L L H L H L H L X X X X H L Transceiver Signal Direction ATN* EOI REN IFC SRQ NRFD NDAC DAV R T R T R T R T H H L L R T R T T R T R R R T T R R T T T T R R T R R T DS75162A Control Input Level SC TE DC H H H H L L L L H H L L H H L L H L H L H L H L X X X X H L X X X X H L Transceiver Signal Direction ATN* EOI REN IFC SRQ NRFD NDAC DAV R T R T R T R T H H L L T T T T R R R R T T T T R R R R T R T R T R T R R R T T R R T T R R T T R R T T T T R R T T R R T R R T H e High level input L e Low level input X e Don’t care T e Transmit, i.e., signal outputted to bus R e Receive, i.e., signal outputted to terminal *The ATN signal level is sensed for internal multiplex control of EOI transmission direction logic. http://www.national.com 8 Physical Dimensions inches (millimeters) Order Number DS75160AWM NS Package Number M20B Molded Dual-In-Line Package (N) Order Number DS75160AN or DS75161AN NS Package Number N20A 9 http://www.national.com DS75160A/DS75161A/DS75162A IEEE-488 GPIB Transceivers Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number DS75162AN NS Package Number N22A 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 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 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 http://www.national.com 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. National Semiconductor Europe Fax: a49 (0) 180-530 85 86 Email: europe.support @ nsc.com Deutsch Tel: a49 (0) 180-530 85 85 English Tel: a49 (0) 180-532 78 32 Fran3ais Tel: a49 (0) 180-532 93 58 Italiano Tel: a49 (0) 180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2308 Fax: 81-043-299-2408 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.