SERIAL-IN PARALLEL-OUT SHIFT REGISTER
The SN54/74LS164 is a high speed 8-Bit Serial-In Parallel-Out Shift Register. Serial data is entered through a 2-Input AND gate synchronous with the LOW to HIGH transition of the clock. The device features an asynchronous Master Reset which clears the register setting all outputs LOW independent of the clock. It utilizes the Schottky diode clamped process to achieve high speeds and is fully compatible with all Motorola TTL products.
•Typical Shift Frequency of 35 MHz
•Asynchronous Master Reset
•Gated Serial Data Input
•Fully Synchronous Data Transfers
•Input Clamp Diodes Limit High Speed Termination Effects
•ESD > 3500 Volts
CONNECTION DIAGRAM DIP (TOP VIEW)
|
VCC |
|
Q7 |
|
Q6 |
|
Q5 |
|
Q4 |
|
MR CP |
|||
|
14 |
|
13 |
|
12 |
|
11 |
|
10 |
|
9 |
|
8 |
|
NOTE:
The Flatpak version has the same pinouts
(Connection Diagram) as the Dual In-Line Package.
|
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
|
A |
|
B |
|
Q0 |
|
Q1 |
|
Q2 |
Q3 |
|
GND |
|
|
PIN NAMES |
|
LOADING (Note a) |
||
|
|
HIGH |
LOW |
|
|
|
|
|
|
A, B |
Data Inputs |
0.5 U.L. |
0.25 |
U.L. |
CP |
Clock (Active HIGH Going Edge) Input |
0.5 U.L. |
0.25 |
U.L. |
MR |
Master Reset (Active LOW) Input |
0.5 U.L. |
0.25 |
U.L. |
Q0 ± Q7 |
Outputs (Note b) |
10 U.L. |
5 (2.5) |
U.L. |
NOTES:
a)1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW.
b)The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges.
SN54/74LS164
SERIAL-IN PARALLEL-OUT
SHIFT REGISTER
LOW POWER SCHOTTKY
|
|
|
J SUFFIX |
|
|
|
CERAMIC |
|
|
|
CASE 632-08 |
14 |
1 |
|
|
|
|
|
|
|
|
|
N SUFFIX |
|
|
|
PLASTIC |
14 |
|
|
CASE 646-06 |
|
|
|
|
|
1 |
|
|
|
|
|
D SUFFIX |
|
14 |
|
SOIC |
|
|
CASE 751A-02 |
|
|
|
1 |
|
|
|
|
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
1 |
|
A |
|
|
|
LS164 |
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|||||||
2 |
|
B |
8-BIT SHIFT REGISTER |
|
|
|
|
||||||||||
|
|
|
|
|
|||||||||||||
8 |
|
CP |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
|
MR Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 |
|||||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
9 |
3 |
4 |
5 |
6 |
10 |
11 |
12 |
13 |
|||||||
|
|
|
|
|
|
VCC = PIN 14 |
|
|
|
|
|
|
|||||
|
|
|
|
|
|
GND = PIN 7 |
|
|
|
|
|
|
|||||
FAST AND LS TTL DATA
5-1
SN54/74LS164
LOGIC DIAGRAM
1 |
A |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
D |
Q |
D |
Q |
D |
Q |
D |
Q |
D |
Q |
D |
Q |
D |
Q |
D |
Q |
||
2 |
|||||||||||||||||
B |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
CD |
|
CD |
|
CD |
|
CD |
|
CD |
|
CD |
|
CD |
|
CD |
|
8 |
CP |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
9 |
MR |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
VCC = PIN 14 |
Q0 |
|
Q1 |
|
Q2 |
|
|
Q3 |
|
Q4 |
Q5 |
|
Q6 |
|
Q7 |
|
|
3 |
|
4 |
|
5 |
|
|
6 |
|
10 |
11 |
|
12 |
|
13 |
GND = PIN 7
= PIN NUMBERS
FUNCTIONAL DESCRIPTION
The LS164 is an edge-triggered 8-bit shift register with serial data entry and an output from each of the eight stages. Data is entered serially through one of two inputs (A or B); either of these inputs can be used as an active HIGH Enable for data entry through the other input. An unused input must be tied HIGH, or both inputs connected together.
Each LOW-to-HIGH transition on the Clock (CP) input shifts data one place to the right and enters into Q0 the logical AND of the two data inputs (A•B) that existed before the rising clock edge. A LOW level on the Master Reset (MR) input overrides all other inputs and clears the register asynchronously, forcing all Q outputs LOW.
MODE SELECT Ð TRUTH TABLE
OPERATING |
|
|
INPUTS |
|
OUTPUTS |
|
MODE |
|
|
|
|
|
|
|
MR |
A |
B |
Q0 |
Q1±Q7 |
|
|
|
|||||
Reset (Clear) |
|
L |
X |
X |
L |
L ± L |
|
|
|
|
|
|
|
|
|
H |
I |
I |
L |
q0 ± q6 |
Shift |
|
H |
I |
h |
L |
q0 ± q6 |
|
|
H |
h |
I |
L |
q0 ± q6 |
|
|
H |
h |
h |
H |
q0 ± q6 |
L (l) = LOW Voltage Levels
H (h) = HIGH Voltage Levels X = Don't Care
qn = Lower case letters indicate the state of the referenced input or output one qn = set-up time prior to the LOW to HIGH clock transition.
GUARANTEED OPERATING RANGES
Symbol |
Parameter |
|
Min |
Typ |
Max |
Unit |
|
|
|
|
|
|
|
VCC |
Supply Voltage |
54 |
4.5 |
5.0 |
5.5 |
V |
|
|
74 |
4.75 |
5.0 |
5.25 |
|
|
|
|
|
|
|
|
TA |
Operating Ambient Temperature Range |
54 |
± 55 |
25 |
125 |
°C |
|
|
74 |
0 |
25 |
70 |
|
|
|
|
|
|
|
|
IOH |
Output Current Ð High |
54, 74 |
|
|
± 0.4 |
mA |
IOL |
Output Current Ð Low |
54 |
|
|
4.0 |
mA |
|
|
74 |
|
|
8.0 |
|
|
|
|
|
|
|
|
FAST AND LS TTL DATA
5-2
Loading...