DS75129 - National Semiconductor

TL/F/5793

DS75129 Eight-Channel Line Receivers

February 1996

DS75129 Eight-Channel Line Receivers

General Description

The DS75129 is an eight-channel line receiver designed to

satisfy the requirements of the input-output interface specifi-

cation for IBM 360/370. The device features common

strobes for each group of four receivers. The DS75129 has

an active-low strobe. Special low-power design and

Schottky-diode-clamped transistors allow low supply-cur-

rent requirements while maintaining fast switching speeds

and high-current TTL outputs. The DS75129 is character-

ized for operation from 0§Cto70

Features

YMeets IBM 360/370 I/O specification

YInput resistanceÐ7 kXto 20 kX

YOutput compatible with TTL

YSchottky-clamped transistors

YOperates from a single 5V supply

YHigh speedÐlow propagation delay

YRatio specificationÐtPLH/tPLH

YCommon strobe for each group of four receivers

YDS75129 strobeÐactive-low

Connection Diagram

DS75129

Dual-In-Line Package

positive logic: Y eAS TL/F/5793–2

Top View

Order Number DS75129N

See NS Package Number N20A

C1996 National Semiconductor Corporation RRD-B30M36/Printed in U. S. A. http://www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Supply Voltage, VCC 7V

Input Voltage Range b0.15V to 7V

Strobe Input Voltage 7V

Maximum Power Dissipation*at 25§C (Note 2)

Molded Package 1687 mW

Operating Free-Air Temperature Range 0§Ctoa

70§C

Storage Temperature Range b65§Ctoa

150§C

*Derate molded package 13.5 mW/§C above 25§C.

Lead Temperature 260§C

(/16 Inch from Case for 4 Seconds: N Package

Recommended Operating

Conditions

Min Typ Max Units

Supply Voltage, VCC 4.5 5.0 5.5 V

High-Level Output Current, IOH b0.4 mA

Low-Level Output Current, IOL 16 mA

Operating Free-Air Temperature, TA070

Electrical Characteristics over recommended operating free-air temperature range (Note 3)

Symbol Parameter Conditions Min Typ Max Units

(Note 5)

VIH High-Level Input Voltage A 1.7 V

IL Low-Level Input Voltage A 0.7 V

S 0.7

VOH High-Level Output Voltage VCC e4.5V, VIL e0.7V, IOH e0.4 mA 2.4 3.1 V

VOL Low-Level Output Voltage VCC e4.5V, VIH e1.7V, IOL e16 mA 0.4 0.5 V

VIInput Clamp Voltage S VCC e4.5V, IIeb

18 mA b1.5 V

IIH High-Level Input Current A VCC e5.5V, VIe3.11V 0.3 0.42 mA

CC e5.5V, VIe2.7V 20 mA

IIL Low-Level Input Current A VCC e5.5V, VIe0.15V b0.24 mA

CC e5.5V, VIe0.4V b0.4

IOS Short-Circuit Output Current VCC e5.5V, VOe0V b18 b60 mA

(Note 4)

rIInput Resistance VCC e4.5V, 0V, or Open, DV, e0.15V to 4.15V 7 20 kX

ICC Supply Current VCC e5.5V, Strobe at 0.4V, All A Inputs at 0.7V 19 31 mA

VCC e5.5V, Strobe at 0.4V, All A Inputs at 4V 32 53

Note 1: ‘‘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 2: For operation above 25§C free-air temperature, refer to Thermal Ratings for ICs, in App Note AN-336.

Note 3: 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 4: Only one output should be shorted at a time.

Note 5: All typical values are at VCC e5V, TAe25§C.

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Switching Characteristics VCC e5V, TAe25§C

Symbol Parameter Conditions Min Typ Max Units

tPLH Propagation Delay Time, Low-to-High-Level Output A71425 ns

PHL Propagation Delay Time, High-to-Low-Level Output 10 18 30 ns

tPLH Propagation Delay Time, Low-to-High-Level Output SRLe400X,

20 35 ns

tPHL Propagation Delay Time, High-to-Low-Level Output CLe50 pF, 16 30 ns

tPLH Ratio of Propagation Delay Times ASee

Figure 1

0.5 0.8 1.3

tPHL

tTLH Transition Time, Low-to-High-Level Output 1 7 12 ns

tTHL Transition Time, High-to-Low-Level Output 1 3 12 ns

Schematic Diagram (each receiver)

TL/F/5793–3

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AC Test Circuit and Switching Time Waveforms

TL/F/5793–4

TL/F/5793–5

Note 1: Input pulses are supplied by a generator having the following characteristics: ZOe50X, PRR e5 MHz.

Note 2: Includes probe and jig capacitance.

Note 3: All diodes are 1N3064 or equivalent.

Note 4: The strobe inputs of DS75129 are in-phase with the output.

Note 5: VREF1 e0.7V and VREF2 e1.7V for testing data (A) inputs, VREF1 eVREF2 e1.3V for strobe inputs.

FIGURE 1

Typical Characteristics

Voltage Transfer Characteristics

From A Inputs

TL/F/5793–6

Voltage Transfer Characteristics

From A Inputs

TL/F/5793–7

Input Current vs

Input Voltage, A Inputs

TL/F/5793–8

Low-Level Output Voltage

vs Output Current

TL/F/5793–9

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DS75129 Eight-Channel Line Receivers

Physical Dimensions inches (millimeters)

Molded Dual-In-Line Package (N)

Order Number DS75129N

NS Package Number N20A

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