SN54HC574, SN74HC574
OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCLS148F – DECEMBER 1982 – REVISED AUGUST 2003
SN54HC574 . . . J OR W PACKAGE
SN74HC574 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
Wide Operating Voltage Range of 2 V to 6 V
High-Current 3-State Noninverting Outputs
Drive Bus Lines Directly or Up To 15 LSTTL
Loads
OE
1D
2D
3D
4D
5D
6D
7D
8D
V
CC
1Q
2Q
1
2
3
4
5
6
7
8
9
20
19
18
Low Power Consumption, 80-µA Max I
CC
Typical t = 22 ns
pd
17 3Q
16 4Q
15 5Q
14 6Q
13 7Q
12 8Q
11 CLK
6-mA Output Drive at 5 V
Low Input Current of 1 µA Max
Bus-Structured Pinout
description/ordering information
GND 10
These octal edge-triggered D-type flip-flops
feature 3-state outputs designed specifically for
bus driving. They are particularly suitable for
implementing buffer registers, I/O ports,
bidirectional bus drivers, and working registers.
SN54HC574 . . . FK PACKAGE
(TOP VIEW)
The eight flip-flops enter data on the low-to-high
transition of the clock (CLK) input.
3
2
1
20 19
18
2Q
3Q
4Q
3D
4D
5D
6D
7D
4
5
6
7
8
17
16
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.
15 5Q
14
6Q
9 10 11 12 13
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP – N
Tube of 20
Tube of 25
Reel of 2000
Reel of 2000
Reel of 2000
Tube of 70
Reel of 2000
Reel of 250
Tube of 20
Tube of 85
Tube of 55
SN74HC574N
SN74HC574N
SN74HC574DW
SN74HC574DWR
SN74HC574DBR
SN74HC574NSR
SN74HC574PW
SN74HC574PWR
SN74HC574PWT
SNJ54HC574J
SOIC – DW
HC574
SSOP – DB
SOP – NS
HC574
HC574
–40°C to 85°C
TSSOP – PW
HC574
CDIP – J
CFP – W
LCCC – FK
SNJ54HC574J
SNJ54HC574W
SNJ54HC574FK
–55°C to 125°C
SNJ54HC574W
SNJ54HC574FK
†
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.
Copyright 2003, 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.
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.
1
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