DS75160A,DS75161A DS75160A/DS75161A IEEE-488 GPIB Transceivers Literature Number: SNOSBL5A DS75160A/DS75161A 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 -- 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. n 8-channel bi-directional non-inverting transceivers n Bi-directional control implemented with TRI-STATE (R) output design n Meets IEEE Standard 488-1978 n High-speed Schottky design n Low power consumption n High impedance PNP inputs (drivers) n 500 mV (typ) input hysteresis (receivers) n On-chip bus terminators n No bus loading when VCC is removed n Pin selectable open collector mode on DS75160A driver outputs n Accommodates multi-controller systems Connection Diagrams Dual-In-Line Package Dual-In-Line Package DS005804-16 Order Number DS75161AN or DS75161AWM See NS Package Number M20B or N20B DS005804-1 Top View Order Number DS75160AN or DS75160AWM See NS Package Number M20B or N20A TRI-STATE (R) is a registered trademark of National Semiconductor Corporation. (c) 2001 National Semiconductor Corporation DS005804 www.national.com DS75160A/DS75161A IEEE-488 GPIB Transceivers May 1999 DS75160A/DS75161A Absolute Maximum Ratings (Note 2) Molded Package If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VCC, Supply Voltage TA, Ambient Temperature IOL, Output Low Current Bus Terminal Supply Voltage, VCC 7.0V Input Voltage 5.5V Storage Temperature Range -65C to +150C Lead Temperature (Soldering, 4 sec.) 260C Maximum Power Dissipation (Note 1) at 25C 1897 mW Min 4.75 0 Max 5.25 70 Units V C 48 16 mA mA Note 1: Derate molded package 15.2 mW/C above 25C. Electrical Characteristics (Notes 3, 4) 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 Terminal Output Voltage VOL Low-Level Output Voltage IIH High-Level Input Current TE, PE, DC, VI = 2.7V 0.1 20 IIL Low-Level SC Inputs VI = 0.5V -10 -100 A 3.0 3.7 V 2 II = -18 mA V -0.8 -1.5 V 400 500 mV IOH = -800 A 2.7 3.5 V Bus (Note 4) IOH = -5.2 mA 2.5 3.4 Terminal IOL = 16 mA 0.3 0.5 Bus IOH = 48 mA 0.4 0.5 Terminal and VI = 5.5V 0.2 100 V A Input Current VBIAS ILOAD Terminator Bias Driver Voltage at Bus Port Disabled II(bus) = 0 (No Load) 2.5 Terminator VI(bus) = -1.5V to 0.4V -1.3 Bus Loading VI(bus) = 0.4V to 2.5V 0 Current Bus Driver -3.2 VI(bus) = 2.5V to 3.7V 2.5 Disabled VI(bus) = 3.7V to 5V 0 2.5 VI(bus) = 5V to 5.5V 0.7 2.5 VCC = 0V, VI(bus) = 0V to 2.5V IOS ICC CIN Short-Circuit Terminal Output Current Bus (Note 6) Supply Current DS75160A Bus-Port VI = 2V, VO = 0V (Note 5) 40 A -15 -35 -75 mA -35 -75 -150 Transmit, TE = 2V, PE = 2V, VI = 0.8V 85 125 Receive, TE = 0.8V, PE = 2V, VI = 0.8V 70 100 DS75161A TE = 0.8V, DC = 0.8V, VI = 0.8V 84 125 Bus VCC = 5V or 0V, VI = 0V to 2V, 20 30 Capacitance mA -3.2 mA pF f = 1 MHz 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 device 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 temperature range and the 4.75V to 5.25V power supply range. All typical values are for TA = 25C and VCC = 5.0V. Note 4: 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 5: Only one output at a time should be shorted. Note 6: This characteristic does not apply to outputs on DS75161A that are open collector. www.national.com 2 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 VL = 2.3V Terminal Bus Propagation Delay Time, CL = 30 pF High to Low Level Output Figure 1 tPLH Propagation Delay Time, VL = 5.0V tPHL Propagation Delay Time, CL = 30 pF High to Low Level Output Figure 2 tPZH Output Enable Time VI = 3.0V tPHZ Output Disable Time TE, DC, RL = 480 From High Level or SC CL = 15 pF Output Enable Time (Note 8) to Low Level (Note 9) Low to High Level Output Bus 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 RL = 38.3 Terminal RL = 240 to High Level VL = 0V Figure 1 tPZL tPLZ Bus VI = 0V VL = 2.3V Output Disable Time RL = 38.3 From Low Level CL = 15 pF Figure 1 tPZH Output Enable Time VI = 3.0V tPHZ Output Disable Time TE, DC, From High Level or SC Output Enable Time (Note 8) VI = 0V to Low Level (Note 9) VL = 5V to High Level VL = 0V RL = 3 k Terminal CL = 15 pF Figure 1 tPZL tPLZ Output Disable Time RL = 280 From Low Level CL = 15 pF Figure 1 tPZH Output Pull-Up Enable VI = 3V Time (DS75160A Only) PE tPHZ Output Pull-Up Disable (Note 8) Bus Time (DS75160A Only) VL = 0V RL = 480 CL = 15 pF Figure 1 Note 7: Typical values are for VCC = 5.0V and TA = 25C and are meant for reference only. Note 8: Refer to Functional Truth Tables for control input definition. Note 9: 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. 3 www.national.com DS75160A/DS75161A Switching Characteristics (Note 7) VCC = 5.0V 5%, TA = 0C to 70C DS75160A/DS75161A Switching Load Configurations DS005804-8 VC logic high = 3.0V VC logic low = 0V *CL includes jig and probe capacitance FIGURE 1. DS005804-9 VC logic high = 3.0V VC logic low = 0V *CL includes jig and probe capacitance FIGURE 2. Connection Diagrams Dual-In-Line Package DS005804-2 Top View 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. Functional Description 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 = 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 www.national.com 4 Logic Diagrams (Continued) Table of Signal Line Abbreviations Signal Line Mne- Classi- monic Definition DS75160A/DS75161A Functional Description DS75160A Device fication DC Direction Control DS75161A Control PE Pull-Up Enable DS75160A Signals TE Talk Enable All SC System Controller Data B1-B8 Bus Side of Device I/O Ports D1-D8 Terminal Side DS75160A of Device Management Signals ATN Attention DAV Data Valid EOI End or Identify IFC Interface Clear NDAC Not Data Accepted NRFD Not Ready for Data REN Remote Enable SRQ Service Request DS75161A DS005804-4 5 www.national.com DS75160A/DS75161A Logic Diagrams (Continued) DS75161A DS005804-5 DS005804-7 Switching Waveforms Transmit Propagation Delays DS005804-10 www.national.com 6 DS75160A/DS75161A Switching Waveforms (Continued) Receive Propagation Delays DS005804-11 Terminal Enable/Disable Times DS005804-12 Bus Enable/Disable Times DS005804-13 *Input signal: f = 1.0 MHz, 50% duty cycle, tr = tf 5 ns Performance Characteristics Bus Port Load Characteristics DS005804-14 Refer to Electrical Characteristics table 7 www.national.com DS75160A/DS75161A Functional Truth Tables DS75160A Control Input Data Transceivers Level TE PE Direction H H T Bus Port Configuration Totem-Pole Output H L T Open Collector Output L X R Input DS75161A Control Input Level Transceiver Signal Direction ATN* TE DC REN IFC SRQ NRFD NDAC DAV H H R R R T R R T H L T T T R R R T L H R R R T T T R L L T T T R T T R EOI H X H T L X H R X H L R X L L T H = High level input L = Low level input X = Don't care T = Transmit, i.e., signal outputted to bus R = Receive, i.e., signal outputted to terminal *The ATN signal level is sensed for internal multiplex control of EOI transmission direction logic. www.national.com 8 DS75160A/DS75161A Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS75160AWM NS Package Number M20B 9 www.national.com DS75160A/DS75161A IEEE-488 GPIB Transceivers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS75160AN or DS75161AN NS Package Number N20A 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. 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