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SCLS242K − OCTOBER 1995 − REVISED JANUARY 2004
SN54AHC573 . . . J OR W PACKAGE
SN74AHC573 . . . DB, DGV, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
D
D
D
Operating Range 2-V to 5.5-V V
CC
3-State Outputs Directly Drive Bus Lines
Latch-Up Performance Exceeds 250 mA Per
JESD 17
OE
1D
2D
3D
4D
5D
6D
7D
8D
V
CC
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
description/ordering information
The ’AHC573 devices are octal transparent
D-type latches designed for 2-V to 5.5-V V
operation.
CC
When the latch-enable (LE) input is high, the
Q outputs follow the data (D) inputs. When LE is
low, the Q outputs are latched at the logic levels
of the D inputs.
GND 10
11 LE
SN54AHC573 . . . 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) 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.
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
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.
9 10 11 12 13
To ensure the high-impedance state during power up or power down, OE should be tied to V
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
through a pullup
CC
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
Tube
SN74AHC573N
SN74AHC573N
Tube
SN74AHC573DW
SN74AHC573DWR
SN74AHC573NSR
SN74AHC573DBR
SN74AHC573PW
SN74AHC573PWR
SN74AHC573DGVR
SNJ54AHC573J
SOIC − DW
AHC573
Tape and reel
Tape and reel
Tape and reel
Tube
SOP − NS
AHC573
HA573
−40°C to 85°C
SSOP − DB
TSSOP − PW
HA573
Tape and reel
Tape and reel
Tube
TVSOP − DGV
CDIP − J
HA573
SNJ54AHC573J
SNJ54AHC573W
SNJ54AHC573FK
CFP − W
Tube
SNJ54AHC573W
SNJ54AHC573FK
−55°C to 125°C
LCCC − FK
Tube
†
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.
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Copyright 2004, Texas Instruments Incorporated
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