Hitachi HD74HC108
This flip-flop is edge sensitive to the clock input and change state on the negative transition of the clock pulse. Each flip-flop has independent J, K, and preset inputs and Q and Q outputs.| Part No. | HD74HC108 |
|---|---|
| Datasheet | HD74HC108 Download |
| Manufacturer |  Hitachi |
| Description | Dual J-K Flip-Flops |
| Buy | Stock & Price |
DESCRIPTION
Two flip-flops are controlled by a common clear and a common clock. Preset and clear are independent of the clock and accomplished by a low logic level on the corresponding input.FEATURES
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● High Speed Operation: tpd (Clock to Q) = 20 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) HD74HC108 Function Table Inputs Preset L H L H H H H H H H Note: Clear H L L H H H H H H H L H Clock X X X J X X X L L H H X X X K X X X L H L H X X X Output Q H L H* 1 Q L H H*1 No change L H Toggle No change No change No change H L 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. Pin Arrangement 1K 1 J Q Q K PR 14 VCC 1Q 2 13 1PR 1Q 3 CK CLR 12 CLR 1J 4 CLR PR CK K 11 2J 2Q 5 Q 10 2PR 2Q 6 Q J 9 CK GND 7 (Top View) 8 2K 2 HD74HC108 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — 0.5 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 20 µA µA I OL = 4 mA I OL = 5.
