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SCAS551D− NOVEMBER 1995 − REVISED OCTOBER 2003
SN54AC564 . . . J OR W PACKAGE
SN74AC564 . . . DB, DW, N, NS, OR PW PACKAGE
(TOP VIEW)
D
D
D
D
2-V to 6-V V
Operation
CC
Inputs Accept Voltages to 6 V
Max t of 9 ns at 5 V
pd
3-State Inverting Outputs Drive Bus Lines
Directly
OE
1D
2D
3D
4D
5D
6D
7D
8D
V
CC
19 1Q
1
2
3
4
5
6
7
8
9
10
20
18
17
16
15
14
13
12
11
2Q
3Q
4Q
5Q
6Q
7Q
8Q
CLK
D
Full Parallel Access for Loading
D
Flow-Through Architecture to Optimize
PCB Layout
description/ordering information
The ’AC564 devices are octal D-type
edge-triggered flip-flops that feature inverting
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.
GND
SN54AC564 . . . FK PACKAGE
(TOP VIEW)
On the positive transition of the clock (CLK) input,
the Q outputs are set to the inverse logic levels set
up at the data (D) inputs.
3
2
1
20 19
18
3D
4D
5D
6D
7D
2Q
17 3Q
4
5
6
7
8
16
15
14
4Q
5Q
6Q
A buffered output-enable (OE) input places 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.
9 10 11 12 13
OE does not affect internal operations of the flip-flops. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
PACKAGE
T
A
PDIP − N
Tube
SN74AC564N
SN74AC564N
Tube
SN74AC564DW
SN74AC564DWR
SN74AC564NSR
SN74AC564DBR
SN74AC564PW
SN74AC564PWR
SNJ54AC564J
SOIC − DW
AC564
Tape and reel
Tape and reel
Tape and reel
Tube
SOP − NS
AC564
AC564
−40°C to 85°C
−55°C to 125°C
SSOP − DB
TSSOP − PW
AC564
Tape and reel
Tube
CDIP − J
CFP − W
LCCC − FK
SNJ54AC564J
SNJ54AC564W
SNJ54AC564FK
Tube
SNJ54AC564W
SNJ54AC564FK
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.
Copyright 2003, Texas Instruments Incorporated
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1
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