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ꢊꢋ ꢌ ꢍꢎꢏꢐꢍꢑ ꢁꢁꢊꢒꢈꢒ ꢋ ꢁꢊꢈ ꢓꢊꢐ ꢊꢋ ꢔ ꢊꢓ ꢀ
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SLLS076B − JANUARY 1977 − REVISED MAY 1995
N PACKAGE
(TOP VIEW)
• Meets or Exceeds the Requirements of
IBM System 360/370 Input/Output
Specification
†
1S/1S
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
• Input Resistance . . . 7 kΩ to 20 kΩ
• Output Compatible With TTL
1A
1Y
2Y
3Y
4Y
5Y
2A
3A
• Schottky-Clamped Transistors
• Operates From a Single 5-V Supply
• High Speed . . . Low Propagation Delay
4A
5A
6A
14 6Y
• Ratio Specification . . . t
/t
PLH PHL
13
12
11
7A
7Y
• Common Strobe for Each Group of Four
8A
8Y
Receivers
†
GND
2S/2S
• SN75128 . . . Active-High Strobes
†
S and S for SN75128 and SN75129, respectively
SN75129 . . . Active-Low Strobes
description
The SN75128 and SN75129 are eight-channel line receivers designed to satisfy the requirements of the
input-output interface specification for IBM 360/370. Both devices feature common strobes for each group of
four devices. The SN75128 has active-high strobes; the SN75129 has active-low strobes. Special low-power
design and Schottky-diode-clamped transistors allow low supply-current requirements while maintaining fast
switching speeds and high-current TTL outputs.
For new IBM 360/370 interface designs, see the SN751730.
The SN75128 and SN75129 are characterized for operation from 0°C to 70°C.
†
logic symbols
SN75128
SN75129
1
1S
1
EN1
EN2
1S
2S
EN1
EN2
11
11
2S
2
1A
3
19
18
17
16
15
14
13
12
2
3
4
5
6
7
8
9
19
18
17
16
15
14
13
12
1Y
2Y
3Y
4Y
5Y
6Y
7Y
8Y
1
2
1Y
2Y
3Y
4Y
5Y
6Y
7Y
8Y
1
2
1A
2A
3A
4A
5A
6A
7A
8A
2A
4
3A
5
4A
6
5A
7
6A
8
7A
9
8A
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
IBM is a trademark of International Business Machines Corp.
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Copyright 1995, Texas Instruments Incorporated
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2−1
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