HIT HD74HC373, HD74HC533 Datasheet
HD74HC373/HD74HC533
Octal D-type Transparent Latches (with 3-state outputs)
Octal D-type Transparent Latches (with inverted 3-state outputs)
Description
When the latch enable input is high, the Q outputs of HD74HC373 will follow the D inputs and the Q
outputs of HD74HC533 will follow the inversion of the D inputs. When the latch enable goes low, data at
the D inputs will be retained at the outputs until latch enable returns high again. When a high logic level is
applied to the output control input, all outputs go to a high impedance state, regardless of what signals are
present at the other inputs and the state of the storage elements.
Features
• High Speed Operation: tpd (D to Q) = 16 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Output Control Enable
GD
LH H H L
LH L L H
L L X No change No change
HX X Z Z
X : irrelevant
Z : Off (high-impedance) state of a 3-state output.
HD74HC373
Q
HD74HC533
Q
HD74HC373/HD74HC533
Pin Arrangement
HD74HC373
HD74HC533
Out put
Control
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
Out put
Control
1Q
1
2
3
4
5
6
7
8
9
10 11
(Top view)
1
2
20
19
18
17
16
15
14
13
12
20
19
CC
V
8Q
8D
7D
7Q
6Q
6D
5D
5Q
Enable G
CC
V
8Q
1D
3
2D
4
2Q
5
3Q
6
3D
7
4D
8
9
4Q
GND
10 11
(Top view)
2
18
8D
17
7D
16
7Q
6Q
15
14
6D
13
5D
12
5Q
Enable G
HD74HC373/HD74HC533
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage range V
Input voltage V
Output voltage V
DC current drain per pin I
DC current drai per VCC GND ICC, I
DC input diode current I
DC output diode current I
Power Dissipation per package P
CC
IN
OUT
OUT
GND
IK
OK
T
Storage temperature Tstg –65 to +150 °C
Block Diagram
HD74HC373
–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V
±35 mA
±75 mA
±20 mA
±20 mA
500 mW
Enable G
Output
Control
1D
2D
D
Q
G
1Q
3D
D
Q
G
2Q
4D
D
Q
G
3Q
5D
D
Q
G
4Q
6D
D
Q
G
5Q
7D
D
Q
G
6Q
8D
D
G
D
Q
7Q
Q
G
8Q
3
HD74HC373/HD74HC533
HD74HC533
Enable G
Output
Control
1D
2D
D
Q
G
1Q
3D
D
Q
G
2Q
4D
D
Q
G
3Q
5D
D
Q
G
4Q
6D
D
Q
G
5Q
7D
D
Q
G
6Q
8D
D
G
D
Q
7Q
Q
G
8Q
4
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