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HD74HC109 Datasheet

  • HD74HC109

  • Dual J-K Flip-Flops (with Preset and Clear)

  • 9頁

  • HITACHI

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HD74HC109
Dual J-K Flip-Flops (with Preset and Clear)
Description
Each flip-flop has independent J,
K,
preset, clear and clock inputs and Q and
Q
outputs. This device is
edge sensitive to the clock input and changes state on the positive going transition of the clock pulse. Clear
and preset are independent of the clock and accomplished by a low logic level on the corresponding input.
Features
鈥?/div>
High Speed Operation: t
pd
(Clock to Q) = 15 ns typ (C
L
= 50 pF)
鈥?/div>
High Output Current: Fanout of 10 LSTTL Loads
鈥?/div>
Wide Operating Voltage: V
CC
= 2 to 6 V
鈥?/div>
Low Input Current: 1 碌A(chǔ) max
鈥?/div>
Low Quiescent Supply Current: I
CC
(static) = 2 碌A(chǔ) max (Ta = 25擄C)
Function Table
Inputs
Preset
L
H
L
H
H
H
H
H
Note:
Clear
H
L
L
H
H
H
H
H
L
Clock
X
X
X
J
X
X
X
L
H
L
H
X
K
X
X
X
L
L
H
H
X
Output
Q
H
L
H*
1
L
Toggle
Q
0
H
Q
0
Q
0
L
Q
0
Q
L
H
H*
1
H
1. Q and
Q
will remain high as long as preset and clear input are low, but Q and
Q
are
unpredictable if preset and clear input go high simultaneously.

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