SN74ALS533A Datasheet, PDF (1/12 Pages) Texas Instruments – OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS

SN74ALS533A, SN74AS533A
OCTAL D-TYPE TRANSPARENT LATCHES
WITH 3-STATE OUTPUTS
SDAS270 – DECEMBER 1994
• Eight Latches in a Single Package
• 3-State Bus-Driving Inverting Outputs
• Full Parallel Access for Loading
• Buffered Control Inputs
• pnp Inputs Reduce dc Loading on
Data Lines
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (N) 300-mil DIPs
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.
DW OR N PACKAGE
(TOP VIEW)
OE 1
1Q 2
1D 3
2D 4
2Q 5
3Q 6
3D 7
4D 8
4Q 9
GND ¹⁰
20 V_CC
19 8Q
18 8D
17 7D
16 7Q
15 6Q
14 6D
13 5D
12 5Q
11 _LE
While latch-enable (LE) input is high, the Q outputs follow the complements of the data (D) inputs. When LE is
taken low, the Q outputs are latched at the inverses of the levels set up at the D inputs. The SN74ALS533A and
SN74AS533A are functionally equivalent to the SN74ALS373A and SN74AS373, except for having inverted
outputs.
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 drive provide the capability to drive bus lines without
interface or pullup components.
OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered
while the outputs are off.
The SN74ALS533A and SN74AS533A are 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
L
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 © 1994, Texas Instruments Incorporated
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