SN54HCT573, SN74HCT573
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS

SCLS176E – MARCH 1984 – REVISED JULY 2003
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
C0068 Operating Voltage Range of 4.5 V to 5.5 V
C0068 High-Current 3-State Outputs Drive Bus
Lines Directly or Up To 15 LSTTL Loads
C0068 Low Power Consumption, 80-µA Max I
CC
C0068 Typical t
pd
= 21 ns
C0068 ±6-mA Output Drive at 5 V
C0068 Low Input Current of 1 µA Max
C0068 Inputs Are TTL-Voltage Compatible
C0068 Bus-Structured Pinout
description/ordering information
These octal transparent D-type latches feature
3-state outputs designed specifically for driving
highly capacitive or relatively low-impedance
loads. The ’HCT573 devices are particularly
suitable for implementing buffer registers, I/O
ports, bidirectional bus drivers, and working
registers.
While the latch-enable (LE) input is high, the
Q outputs respond to the data (D) inputs. When
LE is low, the outputs are latched to retain the data
that was set up at the D inputs.
A buffered output-enable (OE) input can be used
to place the eight outputs in either a normal logic
state (high or low logic levels) or the
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.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N Tube SN74HCT573N SN74HCT573N
SOIC DW
Tube SN74HCT573DW
HCT573 –
Tape and reel SN74HCT573DWR
–40°C to 85°C SOP – NS Tape and reel SN74HCT573NSR HCT573
SSOP – DB Tape and reel SN74HCT573DBR HT573
TSSOP PW
Tube SN74HCT573PW
HT573 –
Tape and reel SN74HCT573PWR
CDIP – J Tube SNJ54HCT573J SNJ54HCT573J
–55°C to 125°C CFP – W Tube SNJ54HCT573W SNJ54HCT573W
LCCC – FK Tube SNJ54HCT573FK SNJ54HCT573FK
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
3212019
910111213
4
5
6
7
8
18
17
16
15
14
2Q
3Q
4Q
5Q
6Q
3D
4D
5D
6D
7D
2D 1D OE
8Q 7Q
V 1Q
8D
GND
LE
SN54HCT573 . . . FK PACKAGE
(TOP VIEW)
CC
SN54HCT573 ...J OR W PACKAGE
SN74HCT573 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1D
2D
3D
4D
5D
6D
7D
8D
GND
V
CC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
LE

Copyright  2003, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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.