SN54AS756_08 Datasheet, PDF (1/16 Pages) Texas Instruments – OCTAL BUFFERS AND LINE DRIVERS WITH OPEN-COLLECTOR OUTPUTS

• Open-Collector Outputs Drive Bus Lines or
Buffer Memory Address Registers
• Eliminate the Need for 3-State Overlap
Protection
• pnp Inputs Reduce dc Loading
• Open-Collector Versions of ′AS240A and
′AS241
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These octal buffers and line drivers are designed
specifically to improve the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters by eliminating the need for 3-state
overlap protection. The designer has a choice of
selected combinations of inverting and
noninverting outputs, symmetrical active-low
output-enable (OE) inputs, and complementary
OE and OE inputs. These devices feature high
fan-out and improved fan-in.
The SN54AS756 is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74AS756 and SN74AS757 are
characterized for operation from 0°C to 70°C.
logic symbols^‡
1
1OE
′AS756
EN
2
1A1
4
1A2
6
1A3
8
1A4
18
1Y1
16
1Y2
14
1Y3
12
1Y4
SN54AS756, SN74AS756, SN74AS757
OCTAL BUFFERS AND LINE DRIVERS
WITH OPEN-COLLECTOR OUTPUTS
SDAS040B – DECEMBER 1983 – REVISED JANUARY 1995
SN54AS756 . . . J PACKAGE
SN74AS756, SN74AS757 . . . DW OR N PACKAGE
(TOP VIEW)
1OE ₁
1A1 ₂
2Y4 3
1A2 4
2Y3 5
1A3 6
2Y2 7
1A4 8
2Y1 9
GND 10
20 ^V_CC
19 ^{2OE / 2OEâ€} 
18 1Y1
17 2A4
16 1Y2
15 2A3
14 1Y3
13 2A2
12 1Y4
11 2A1
SN54AS756 . . . FK PACKAGE
(TOP VIEW)
1A2
3 2 1 20 19
4
18
1Y1
2Y3 ₅
17 ^2A4
1A3 6
16 1Y2
2Y2 7
15 2A3
1A4 8
14 1Y3
9 10 11 12 13
† _{2OE for ′AS756 or 2OE for SN74AS757}
1
1OE
2
1A1
4
1A2
6
1A3
8
1A4
SN74AS757
EN
18
1Y1
16
1Y2
14
1Y3
12
1Y4
19
2OE
EN
19
2OE
EN
11
2A1
13
2A2
15
2A3
17
2A4
9
2Y1
7
2Y2
5
2Y3
3
2Y4
11
2A1
13
2A2
15
2A3
17
2A4
‡ _{These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.}
9
2Y1
7
2Y2
5
2Y3
3
2Y4
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1995, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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