SN54ALS580B, SN74ALS580B, SN74AS580
OCTAL D-TYPE TRANSPARENT LATCHES
WITH 3-STATE OUTPUTS
SDAS277 – JANUARY 1995
SN54ALS580B . . . J OR W PACKAGE
SN74ALS580B, SN74AS580 . . . DW OR N PACKAGE
(TOP VIEW)
• 3-State Buffer-Type Outputs Drive Bus
Lines Directly
• Bus-Structured Pinout
• Inverting-Logic Outputs
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), Standard Plastic (N) and
Ceramic (J) 300-mil DIPs, and Ceramic Flat
(W) Packages
OE
1D
2D
3D
4D
5D
6D
7D
8D
V
CC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
1Q
2Q
3Q
4Q
5Q
6Q
description
13 7Q
12 8Q
These octal D-type transparent latches feature
3-state outputs designed specifically for driving
highly capacitive or relatively low-impedance
loads. They are particularly suitable for
implementing buffer registers, I/O ports,
bidirectional bus drivers, and working registers.
11
GND
LE
SN54ALS580B . . . FK PACKAGE
(TOP VIEW)
While the latch-enable (LE) input is high, outputs
(Q) respond to the data (D) inputs. When LE islow,
the outputs are latched to retain the data that was
set up.
3
2
1
20 19
18
2Q
3Q
4Q
5Q
6Q
3D
4D
5D
6D
7D
4
5
6
7
8
17
16
15
14
A buffered output-enable (OE) input can be used
to place the eight outputs in either a normal logic
state (high or low) or a high-impedance state. In
thehigh-impedancestate, theoutputsneitherload
nor drive the bus lines significantly. The
high-impedance state and the increased drive
provide the capability to drive bus lines without
interface or pullup components.
9 10 11 12 13
OE does not affect internal operations of the latches. Old data can be retained or new data can be entered while
the outputs are in the high-impedance state.
The SN54ALS580B is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74ALS580B and SN74AS580 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each latch)
INPUTS
OUTPUT
Q
OE
L
LE
H
H
L
D
H
L
L
L
H
L
X
X
Q
0
H
X
Z
Copyright 1995, Texas Instruments Incorporated
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.
1
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