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HD74HC74AP fiches techniques PDF

Hitachi Semiconductor - Dual D-type Flip-Flops (with Preset and Clear)

Numéro de référence HD74HC74AP
Description Dual D-type Flip-Flops (with Preset and Clear)
Fabricant Hitachi Semiconductor 
Logo Hitachi Semiconductor 





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HD74HC74AP fiche technique
HD74HC74
Dual D-type Flip-Flops (with Preset and Clear)
Description
The flip-flop has independent data, preset, clear, and clock inputs and Q and Q outputs. The logic level
present at thte data input is transferred to the output during the positive going transition to the clock pulse.
Preset and clear are independent of the clock and accomplished by a low level at the appropriate input.
Features
High Speed Operation: tpd (Clock to Q or Q) = 14 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 2 µA max (Ta = 25°C)
Function Table
Inputs
Preset
Clear
Clock
Data
Outputs
Q
Q
LH X X H L
HL
LL
XX
XX
LH
H*1 H*1
HH
HHL
HH
LLH
HH
L
X
no change
no change
HH
HX
no change
no change
H
Note:
H
X
no change
no change
1. Q and Q will remain HIGH as long as Preset and Clear are Low, but Q and Q are unpredictable,
if Preset and Clear go HIGH simultaneously.

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