5-447
FAST AND LS TTL DATA
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
C0049C0056 C0049C0055 C0049C0054 C0049C0053 C0049C0052 C0049C0051
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0050C0048 C0049C0057
C0056
C0086
C0067C0067
C0077C0082
C0081
C0055
C0068
C0055
C0068
C0054
C0081
C0054
C0068
C0053
C0081
C0053
C0068
C0052
C0081
C0048
C0068
C0048
C0068
C0049
C0081
C0049
C0081
C0050
C0068
C0050
C0068
C0051
C0057 C0049C0048
C0081
C0051
C0071C0078C0068
C0049C0050 C0049C0049
C0081
C0052
C0067C0080
CONNECTION DIAGRAM DIP (TOP VIEW)
PIN NAMES LOADING (Note a)
HIGH LOW
CP Clock (Active HIGH Going Edge) Input 0.5 U.L. 0.25 U.L.
D
0
–D
7
Data Inputs 0.5 U.L. 0.25 U.L.
MR Master Reset (Active LOW) Input 0.5 U.L. 0.25 U.L.
Q
0
–Q
7
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 D
x
Q
x
L X X L
H H H
H L L
H = HIGH Logic Level
L = LOW Logic Level
X = Immaterial
LOGIC DIAGRAM
C0067C0080
C0077C0082
C0068
C0048
C0068
C0049
C0068
C0050
C0068
C0051
C0068
C0052
C0068
C0053
C0068
C0054
C0068
C0055
C0081
C0048
C0081
C0049
C0081
C0050
C0081
C0051
C0081
C0052
C0081
C0053
C0081
C0054
C0081
C0055
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0067C0080 C0068
C0067C0068
C0081
C0049C0052
C0049
C0050 C0054
C0055C0051 C0056C0052
C0053 C0057
C0049C0049
C0049C0050
C0049C0051
C0049C0053
C0086
C0067C0067
C0061 C0080C0073C0078 C0050C0048
C0071C0078C0068 C0061 C0080C0073C0078 C0049C0048
C0061 C0080C0073C0078 C0078C0085C0077C0066C0069C0082C0083
C0049C0055 C0049C0056
C0049C0054 C0049C0057
SN54/74LS273
OCTAL D FLIP-FLOP
WITH CLEAR
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03