5-316
FAST AND LS TTL DATA
4-BIT D-TYPE REGISTER
WITH 3-STATE OUTPUTS
The SN54/74LS173A is a high-speed 4-Bit Register featuring 3-state
outputs for use in bus-organized systems. The clock is fully edge-triggered
allowing either a load from the D inputs or a hold (retain register contents)
depending on the state of the Input Enable Lines (IE
1
, IE
2
). A HIGH on either
Output Enable line (OE
1
, OE
2
) brings the output to a high impedance state
without affecting the actual register contents. A HIGH on the Master Reset
(MR) input resets the Register regardless of the state of the Clock (CP), the
Output Enable (OE
1
, OE
2
) or the Input Enable (IE
1
, IE
2
) lines.
• Fully Edge-Triggered
• 3-State Outputs
• Gated Input and Output Enables
• Input Clamp Diodes Limit High-Speed Termination Effects
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
CONNECTION DIAGRAM DIP (TOP VIEW)
C0049C0052 C0049C0051 C0049C0050 C0049C0049 C0049C0048 C0057
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0049C0054 C0049C0053
C0056
C0086
C0067C0067
C0079C0069
C0049
C0077C0082 C0068
C0048
C0068
C0049
C0068
C0050
C0073C0069
C0050
C0068
C0051
C0073C0069
C0049
C0079C0069
C0050
C0081
C0048
C0081
C0049
C0081
C0050
C0081
C0051
C0067C0080 C0071C0078C0068
PIN NAMES LOADING (Note a)
HIGH LOW
D
0
–D
3
IE
1
–IE
2
OE
1
–OE
2
CP
MR
Q
0
–Q
3
Data Inputs
Input Enable (Active LOW)
Output Enable (Active LOW) Inputs
Clock Pulse (Active HIGH Going Edge)
Input
Master Reset Input (Active HIGH)
Outputs (Note b)
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.5 U.L.
65 (25) U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
15 (7.5) 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)
b. Temperature Ranges.
SN54/74LS173A
4-BIT D-TYPE REGISTER
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
C0086
C0067C0067
C0061 C0080C0073C0078 C0049C0054
C0071C0078C0068 C0061 C0080C0073C0078 C0056
C0068
C0048
C0068
C0049
C0068
C0050
C0068
C0051
C0067C0080
C0079C0069
C0077C0082
C0049 C0050
C0049
C0049
C0050 C0050
C0081
C0049
C0081
C0048
C0081
C0050
C0081
C0051
C0057 C0049C0048 C0049C0052 C0049C0051 C0049C0050 C0049C0049
C0051 C0052 C0053 C0054C0049C0053
C0055
C0073C0069