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Motorola Semiconductors - OCTAL D FLIP-FLOP WITH CLEAR

Numéro de référence 74LS273
Description OCTAL D FLIP-FLOP WITH CLEAR
Fabricant Motorola Semiconductors 
Logo Motorola Semiconductors 





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74LS273 fiche technique
OCTAL D FLIP-FLOP WITH CLEAR
The SN54 / 74LS273 is a high-speed 8-Bit Register. The register consists of
eight D-Type Flip-Flops with a Common Clock and an asynchronous active
LOW Master Reset. This device is supplied in a 20-pin package featuring 0.3
inch lead spacing.
8-Bit High Speed Register
Parallel Register
Common Clock and Master Reset
Input Clamp Diodes Limit High-Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC Q7 D7 D6 Q6 Q5 D5 D4 Q4 CP
20 19 18 17 16 15 14 13 12 11
SN54/74LS273
OCTAL D FLIP-FLOP
WITH CLEAR
LOW POWER SCHOTTKY
20
1
J SUFFIX
CERAMIC
CASE 732-03
1 2 3 4 5 6 7 8 9 10
MR Q0 D0 D1 Q1 Q2 D2 D3 Q3 GND
PIN NAMES
LOADING (Note a)
HIGH
LOW
CP
Clock (Active HIGH Going Edge) Input
0.5 U.L.
0.25 U.L.
D0 – D7
MR
Data Inputs
Master Reset (Active LOW) Input
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
Q0 – Q7 Register 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.
TRUTH TABLE
MR CP Dx Qx
LXX
HH
HL
L
H
L
H = HIGH Logic Level
L = LOW Logic Level
X = Immaterial
LOGIC DIAGRAM
3
4
7
8
13
11 D0 D1 D2 D3 D4
CP
20
1
20
1
N SUFFIX
PLASTIC
CASE 738-03
DW SUFFIX
SOIC
CASE 751D-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
14 17 18
D5 D6 D7
CP D
CP D
CP D
CP D
CP D
CP D
CP D
CP D
1
CD Q
CD Q
CD Q
CD Q
CD Q
CD Q
CD Q
CD Q
MR
VCC = PIN 20
GND = PIN 10
= PIN NUMBERS
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
2
5
6
9
12
15 16
19
FAST AND LS TTL DATA
5-447

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