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74221

Hitachi Semiconductor
Part Number 74221
Manufacturer Hitachi Semiconductor
Description Dual Monostable Multivibrators
Published Apr 3, 2005
Detailed Description HD74HC221 Dual Monostable Multivibrators (with Schmitt Trigger Input) Description Each multivibrator features both a ne...
Datasheet PDF File 74221 PDF File

74221
74221

Overview
HD74HC221 Dual Monostable Multivibrators (with Schmitt Trigger Input) Description Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit.
Also included is a clear inpt that when taken low resets the one shot.
The HD74HC221 can be triggered on the positive transition of teh clear while A is held low and B is held high.
This device is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.
The output pulse equation is simply: tW = 0.
7·(Rext)·(Cext) Features • • • • • High Speed Operation 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 Function Table Inputs Clear L X X H H L A X H X L H H B X X L Outputs Q L L L Q H H H HD74HC221 Pin Arrangement 1A 1B CLR1 1Q 2Q Cext 2 2 Rext/ Cext GND 1 2 3 4 5 Q CLR Q Q 16 15 14 13 12 11 10 9 (Top view) VCC 1 Rext/ Cext 1 Cext 1Q 2Q 2CLR 2B 2A Q CLR 6 7 8 Logic Diagram VCC Rext Cext Cext Rext /Cext A B Q Clear Q Q Clear 2 HD74HC221 DC Characteristics Sym- VCC Ta = 25°C Item Input voltage bol VIH Ta = –40 to +85°C (V) Min Typ Max Min Max Unit Test Conditions 2.
0 1.
5 — — — — 0.
5 1.
5 — V 4.
5 3.
15 — 6.
0 4.
2 VIL 2.
0 — 4.
5 — 6.
0 — Output voltage VOH 2.
0 1.
9 4.
5 4.
4 6.
0 5.
9 — — — — 2.
0 4.
5 6.
0 3.
15 — 4.
2 — — 0.
5 1.
35 1.
8 — — — I OH = –4 mA I OH = –5.
2 mA V Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V 1.
35 — 1.
8 — — — — — 0.
1 0.
1 0.
1 — 1.
9 4.
4 5.
9 4.
5 4.
18 — 6.
0 5.
68 — VOL 2.
0 — 4.
5 — 6.
0 — 4.
5 — 6.
0 — Input current Quiescent supply current Iin I CC 6.
0 — 6.
0 — 6.
0 — 0.
0 0.
0 0.
0 — — — — — 4.
13 — 5.
63 — — — — 0.
1 0.
1 0.
1 0.
33 0.
33 ±1.
0 µA 220 220 µA Vin = VCC or GND 0.
26 — 0.
26 — ±0.
1 — 130 — 130 — I OL = 4 mA I OL = 5.
2 mA Vin = VCC or GND Iout = 0 µA Rext/Cent = 0.
5 VCC 3 HD74HC221 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = 25°C Item Trigger propagation delay time t PHL ...


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