SN54ACT564 Datasheet, PDF (1/6 Pages) Texas Instruments – OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS WITH 3-STATE OUTPUTS

SN54ACT564, SN74ACT564
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCAS549A – NOVEMBER 1995 – REVISED MAY 1996
D Inputs Are TTL-Voltage Compatible
D EPIC™ (Enhanced-Performance Implanted
CMOS) 1-µm Process
D 3-State Inverted Outputs Drive Bus Lines
Directly
D Flow-Through Architecture to Optimize
PCB Layout
D Full Parallel Access for Loading
D Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), Thin Shrink Small-Outline (PW),
Ceramic Chip Carriers (FK) and
Flatpacks (W), and Standard Plastic (N) and
Ceramic (J) DIPs
description
SN54ACT564 . . . J OR W PACKAGE
SN74ACT564 . . . DB, DW, N, 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 CLK
SN54ACT564 . . . FK PACKAGE
(TOP VIEW)
The ’ACT564 are octal D-type edge-triggered
flip-flops that feature 3-state outputs designed
specifically for driving highly capacitive or
relatively low-impedance loads. They are particu-
larly suitable for implementing buffer registers, I/O
ports, bidirectional bus drivers, and working
registers.
On the positive transition of the clock (CLK) input,
the Q outputs are set to the complements of the
logic levels set up at the data (D) inputs.
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
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.
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.
The SN54ACT564 is characterized for operation over the full military temperature range of – 55°C to 125°C. The
SN74ACT564 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OE CLK D
OUTPUT
Q
L
↑
H
L
L
↑
L
H
L H or L X
Q0
H
X
X
Z
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.
EPIC is a trademark of 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.
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Copyright © 1996, Texas Instruments Incorporated
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