HITACHI HD74HCT563, HD74HCT573 User Manual
HD74HCT563
HD74HCT563/HD74HCT573
Octal Transparent Latches (with 3-state outputs)
Description
When the latch enable (LE) input is high, the Q outputs of HD74HCT563 will follow the inversion of the D inputs and the Q outputs of HD74HCT573 will follow the D inputs.
When the latch enable goes low, data at the D inputs will be retained at the outputs until latch enabled 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
•LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
•High Speed Operation: tpd (D to Q, Q) = 13 ns typ (CL = 50 pF)
•High Output Current: Fanout of 15 LSTTL Loads
•Wide Operating Voltage: VCC = 4.5 to 5.5 V
•Low Input Current: 1 µA max
•Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
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Outputs |
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Output Control |
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Latch Enable |
Data |
HD74HCT563 |
HD74HCT573 |
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L |
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H |
H |
L |
H |
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L |
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H |
L |
H |
L |
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L |
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L |
X |
Q0 |
Q0 |
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H |
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X |
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Z |
Z |
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HD74HCT563/HD74HCT573
Pin Arrangement
HD74HCT563
Output |
1 |
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20 |
VCC |
Control |
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1D |
2 |
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OE |
19 1Q |
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D |
Q |
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2D |
3 |
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OE |
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18 |
2Q |
D |
Q |
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3D |
4 |
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OE |
17 |
3Q |
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D |
Q |
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4D |
5 |
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OE |
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16 |
4Q |
D |
Q |
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5D |
6 |
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OE |
15 |
5Q |
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D |
Q |
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6D |
7 |
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OE |
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14 |
6Q |
D |
Q |
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7D |
8 |
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OE |
13 |
7Q |
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D |
Q |
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8D |
9 |
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OE |
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12 |
8Q |
D |
Q |
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GND 10 |
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11 |
Latch |
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Enable |
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(Top view)
2
HD74HCT563/HD74HCT573
HD74HCT573
Output |
1 |
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20 |
VCC |
Control |
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1D |
2 |
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OE |
19 1Q |
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D |
Q |
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2D |
3 |
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OE |
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18 |
2Q |
D |
Q |
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3D |
4 |
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OE |
17 3Q |
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D |
Q |
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4D |
5 |
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OE |
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16 |
4Q |
D |
Q |
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5D |
6 |
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OE |
15 5Q |
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D |
Q |
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6D |
7 |
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OE |
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14 |
6Q |
D |
Q |
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7D |
8 |
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OE |
13 7Q |
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D |
Q |
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8D |
9 |
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OE |
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12 |
8Q |
D |
Q |
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GND 10 |
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11 |
Latch |
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Enable |
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(Top view)
3
HD74HCT563/HD74HCT573
Block Diagram
HD74HCT563
1D |
D |
1Q |
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C Q |
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C |
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2D |
D |
2Q |
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C Q |
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C |
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3D |
D |
3Q |
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C Q |
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C |
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4D |
D |
4Q |
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C Q |
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C |
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5D |
D |
5Q |
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C Q |
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C |
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6D |
D |
6Q |
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C Q |
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C |
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7D |
D |
7Q |
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C Q |
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C |
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8D |
D |
8Q |
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C Q |
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C |
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Enable C |
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OC |
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4
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