SN54ALS563B Datasheet, PDF (1/5 Pages) Texas Instruments – OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS

SN54ALS563B, SN74ALS563B
OCTAL D-TYPE TRANSPARENT LATCHES
WITH 3-STATE OUTPUTS
SDAS163A – DECEMBER 1982 – REVISED JANUARY 1995
• 3-State Buffer-Type Outputs Drive Bus
Lines Directly
• Bus-Structured Pinout
• 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
description
These 8-bit 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.
SN54ALS563B . . . J OR W PACKAGE
SN74ALS563B . . . DW OR N PACKAGE
(TOP VIEW)
OE ₁
1D ₂
2D 3
3D 4
4D 5
5D 6
6D 7
7D 8
8D 9
GND 10
20 ^V_CC
19 ^1Q
18 2Q
17 3Q
16 4Q
15 5Q
14 6Q
13 7Q
12 8Q
11 LE
SN54ALS563B . . . FK PACKAGE
(TOP VIEW)
While the latch-enable (LE) input is high, the Q
outputs follow the complements of data (D) inputs.
When LE is taken low, the outputs are latched at
the inverses of the levels set up at the D inputs.
A buffered output-enable (OE) input places the
eight outputs in either a normal logic state (high or
low logic levels) or a high-impedance state. In the
high-impedance state, the outputs neither load
nor drive the bus lines significantly. The
high-impedance state and increased high logic
level provide the capability to drive bus lines
without interface or pullup components.
3D
3 2 1 20 19
4
18
2Q
4D ₅
17 ^3Q
5D 6
16 4Q
6D 7
15 5Q
7D 8
14 6Q
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 SN54ALS563B is characterized for operation over the full military temperature range of – 55°C to 125°C.
The SN74ALS563B is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each latch)
INPUTS
OE LE
D
OUTPUT
Q
L
H
H
L
L
H
H
H
L
L
X
Q0
H
X
X
Z
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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Copyright © 1995, Texas Instruments Incorporated
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