SN54ACT573 Datasheet, PDF (1/16 Pages) Texas Instruments – OCTAL D-TYPE TRANSPARENT LATCHES WITH 3-STATE OUTPUTS

SN54ACT573, SN74ACT573
OCTAL D-TYPE TRANSPARENT LATCHES
WITH 3-STATE OUTPUTS
SCAS538D – OCTOBER 1995 – REVISED OCTOBER 2002
D 4.5-V to 5.5-V V_CC Operation
D Inputs Accept Voltages to 5.5 V
D Max t_pd of 9.5 ns at 5 V
D Inputs Are TTL-Voltage Compatible
description/ordering information
These 8-bit latches feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. The devices
are particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The eight latches are D-type transparent latches.
When the latch-enable (LE) input is high, the Q
outputs follow the data (D) inputs. When LE is
taken low, the Q outputs are latched at the logic
levels set up at the D inputs.
SN54ACT573 . . . J OR W PACKAGE
SN74ACT573 . . . DB, DW, N, NS, OR PW 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
SN54ACT573 . . . FK PACKAGE
(TOP VIEW)
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 in a bus-organized system without need for
interface or pullup components.
3 2 1 20 19
3D 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 the 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.
To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – N
Tube
SN74ACT573N
SN74ACT573N
–40°C to 85°C
SOIC – DW
SOP – NS
Tube
Tape and reel
Tape and reel
SN74ACT573DW
SN74ACT573DWR
SN74ACT573NSR
ACT573
ACT573
SSOP – DB
Tape and reel SN74ACT573DBR
AD573
TSSOP – PW
Tape and reel SN74ACT573PWR
AD573
CDIP – J
Tube
SNJ54ACT573J
SNJ54ACT573J
–55°C to 125°C CFP – W
Tube
SNJ54ACT573W
SNJ54ACT573W
LCCC – FK
Tube
SNJ54ACT573FK
SNJ54ACT573FK
† _{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.
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2002, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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