
SN54ALS564B, SN74ALS564B
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS164B – APRIL 1982 – REVISED JANUARY 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• 3-State Buffer-Type Inverting Outputs Drive
Bus Lines Directly
• Bus-Structured Pinout
• Buffered Control Inputs
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), Standard Plastic (N) and
Ceramic (J) 300-mil DIPs, and Ceramic Flat
(W) Packages
description
These octal D-type edge-triggered flip-flops
feature inverting 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.
The eight flip-flops enter data on the low-to-high
transition of the clock (CLK) input.
The output-enable (OE
) input 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 SN54ALS564B is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74ALS564B is characterized for
operation from 0°C to 70°C.
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
OE CLK D
Q
L ↑ H L
L ↑ LH
LLX Q
0
HXX Z
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1D
2D
3D
4D
5D
6D
7D
8D
GND
V
CC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
CLK
SN54ALS564B ...J OR W PACKAGE
SN74ALS564B . . . DW OR N PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
2Q
3Q
4Q
5Q
6Q
3D
4D
5D
6D
7D
SN54ALS564B . . . FK PACKAGE
(TOP VIEW)
2D1DOE
8Q
7Q 1Q
8D
GND
CLK
V
CC
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.

SN54ALS564B, SN74ALS564B
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS164B – APRIL 1982 – REVISED JANUARY 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
OE
1D
2
1D
3
2D
4
3D
5
4D
6
5D
11
CLK
19
18
17
16
15
14
13
12
7
6D
8
7D
9
8D
EN
1
OE
CLK
1D
1Q
1
11
2
19
To Seven Other Channels
C1
1D
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
C1
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage, V
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54ALS564B –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS564B 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54ALS564B SN74ALS564B
V
CC
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
I
OH
High-level output current –1 –2.6 mA
I
OL
Low-level output current 12 24 mA
f
clock
Clock frequency 0 22 0 30 MHz
t
w
Pulse duration, CLK high or low 25 14 ns
t
su
Setup time, data before CLK↑ 15 15 ns
t
h
Hold time, data after CLK↑ 4 0 ns
T
A
Operating free-air temperature –55 125 0 70 °C

SN54ALS564B, SN74ALS564B
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS164B – APRIL 1982 – REVISED JANUARY 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
V
IK
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC –2 VCC –2
V
OH
IOH = –2.6 mA 2.4 3.2
IOL = 12 mA 0.25 0.4 0.25 0.4
I
OZH
VCC = 5.5 V, VO = 2.7 V 20 20 µA
I
OZL
VCC = 5.5 V, VO = 0.4 V –20 –20 µA
I
I
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
I
IH
VCC = 5.5 V, VI = 2.7 V 20 20 µA
I
IL
VCC = 5.5 V, VI = 0.4 V –0.2 –0.2 mA
I
O
‡
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
Outputs high 10 18 10 18
I
CC
VCC = 5.5 V
Outputs low 15 24 15 24
mA
Outputs disabled 16 30 16 30
†
All typical values are at VCC = 5 V, TA = 25°C.
‡
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω
,
R2 = 500 Ω,
TA = MIN to MAX
§
UNIT
SN54ALS564B SN74ALS564B
MIN MAX MIN MAX
f
max
22 30 MHz
t
PLH
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

SN54ALS564B, SN74ALS564B
OCTAL D-TYPE EDGE-TRIGGERED FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS164B – APRIL 1982 – REVISED JANUARY 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
t
PHZ
t
PLZ
t
PHL
t
PLH
0.3 V
t
PZL
t
PZH
t
PLH
t
PHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
From Output
Under Test
Test
Point
R1
S1
C
L
(see Note A)
7 V
1.3 V
1.3 V1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
t
h
t
su
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
1.3 V 1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
t
w
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note C)
1.3 V 1.3 V
1.3 V1.3 V
1.3 V 1.3 V
1.3 V1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
V
OL
V
OH
V
OH
V
OL
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
[
0 V
V
OH
V
OL
[
3.5 V
In-Phase
Output
0.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
R2
V
CC
R
L
Test
Point
From Output
Under Test
C
L
(see Note A)
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
From Output
Under Test
Test
Point
C
L
(see Note A)
R
L
RL = R1 = R2
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms

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Copyright 1998, Texas Instruments Incorporated