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SN74ALS880A Datasheet(PDF) 1 Page - Texas Instruments

Part No. SN74ALS880A
Description  DUAL 4-BIT D-TYPE LATCHES WITH 3-STATE OUTPUTS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SN54ALS880A, SN54AS880, SN74ALS880A, SN74AS880
DUAL 4-BIT D-TYPE LATCHES WITH 3-STATE OUTPUTS
SDAS079A – D2661, DECEMBER 1982 – REVISED MAY 1986
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Copyright
© 1986, Texas Instruments Incorporated
1
3-State Buffer-Type Outputs Drive Bus
Lines Directly
Bus-Structured Pinout
’ALS873B is Alternative Version With
Noninverting Outputs
Package Options Include Plastic Small
Outline Packages, Both Plastic and
Ceramic Chip Carriers, and Standard
Plastic and Ceramic 300-mil DIPs
Dependable Texas Instruments Quality and
Reliability
description
These dual 4-bit registers feature 3-state outputs
designed specifically for bus driving. This makes
these devices particularly suitable for implement-
ing buffer registers, I/O ports, bidirectional bus
drivers, and working registers.
The dual 4-bit latches are transparent D-type.
When the latch enable input (1C or 2C) is high, the
Q outputs will follow the data (D) inputs in inverted
form, according to the function table. When the
latch enable input is taken low, the outputs will be
latched. When PRE goes low, the Q outputs go low
independently of the clock. The outputs are in a
high-impedance state when OC (output control) is
at a high logic level.
The SN54ALS880A and SN54AS880 are charac-
terized for operation over the full military
temperature range of – 55
°C to 125°C. The
SN74ALS880A and SN74AS880 are character-
ized for operation from 0
°C to 70°C.
FUNCTION TABLE
(each latch)
INPUTS
OUTPUT
OC
PRE
C
D
Q
L
L
X
X
L
L
HH
H
L
L
HH
L
H
L
HL
X
Q0
H
X
X
X
Z
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
1PRE
1OC
1D1
1D2
1D3
1D4
2D1
2D2
2D3
2D4
2OC
GND
VCC
1C
1Q1
1Q2
1Q3
1Q4
2Q1
2Q2
2Q3
2Q4
2C
2PRE
SN54ALS880A, SN54AS880 . . . JT PACKAGE
SN74ALS880A, SN74AS880 . . . DW OR NT PACKAGE
(TOP VIEW)
32 1
13 14
5
6
7
8
9
10
11
1Q2
1Q3
1Q4
NC
2Q1
2Q2
2Q3
1D2
1D3
1D4
NC
2D1
2D2
2D3
4
15 16 17 18
SN54ALS880A, SN54AS880 . . . JT PACKAGE
SN74ALS880A, SN74AS880 . . . DW OR NT PACKAGE
(TOP VIEW)
28 27 26
25
24
23
22
21
20
19
12
NC – No internal connection
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.




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