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HD74HC108

Hitachi Semiconductor
Part Number HD74HC108
Manufacturer Hitachi Semiconductor
Description Dual J-K Flip-Flops
Published Mar 23, 2005
Detailed Description HD74HC108 Dual J-K Flip-Flops (with Preset, Common Clear and Common Clock) Description This flip-flop is edge sensitive...
Datasheet PDF File HD74HC108 PDF File

HD74HC108
HD74HC108

Overview
HD74HC108 Dual J-K Flip-Flops (with Preset, Common Clear and Common Clock) Description 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.
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 • • • • • 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.
2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = –4 mA I OH = –5.
2 mA Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.
0 4.
5 6.
0 1.
5 — 3.
15 — 4.
2 — — — — — — — — — — 0.
5 1.
5 3.
15 4.
2 — VIL 2.
0 4.
5 6.
0 1.
35 — 1.
8 — 1.
9 4.
4 5.
9 4.
13 5.
63 — — — Output voltage VOH 2.
0 4.
5 6.
0 4.
5 6.
0 1.
9 2.
0 — 4.
4 4.
5 — 5.
9 6.
0 — 4.
18 — 5.
68 — — — — — — — — — — VOL 2.
0 4.
5 6.
0 4.
5 6.
0 0.
0 0.
1 0.
0 0.
1 0.
0 0.
1 — — — — 0.
26 — 0.
26 — ±0.
1 — 2.
0 — Input current Quiescent su...


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