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HD74HC4538

Hitachi Semiconductor
Part Number HD74HC4538
Manufacturer Hitachi Semiconductor
Description Dual Precision Retriggerable/Resettable Monostable Multivibrators
Published Mar 23, 2005
Detailed Description HD74HC4538 Dual Precision Retriggerable/Resettable Monostable Multivibrators Description Each multivibrator features bo...
Datasheet PDF File HD74HC4538 PDF File

HD74HC4538
HD74HC4538


Overview
HD74HC4538 Dual Precision Retriggerable/Resettable Monostable Multivibrators Description Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input.
Also included is a clear input that when taken low resets the one short.
The HD74HC4538 is retriggerable.
That is, it may be triggered repeatedly while their outputs are generating a pulse and the pulse will be extended.
Pulse width stability over a wide range of temperature.
The output pulse equation is simply: tw = 0.
7 (R) (C).
Features • • • • • High Speed Operation: tpd (A or B to Y) = 22 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 Function Table Inputs CD L H H H H X : Irrelevant H L A X L H Not triggered Not triggered B X Outputs Q L Q H HD74HC4538 Pin Arrangement T1A T2A CDA AA BA QA QA GND 1 2 3 4 5 6 7 8 (Top view) T1 T2 T1 16 VCC 15 T1B 14 T2B 13 CDB 12 AB 11 BB 10 QB 9 QB CD T2 A CD B A Q B Q Q Q 2 HD74HC4538 Block Diagram CX RX VCC T1A T2A QA AA BA QA CDA CX RX VCC T1B T2B QB AB BB QB CDB RX and CX are external components 3 HD74HC4538 Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage DC input diode current DC input diode current pin 2, 14 DC output diode current DC current drain per pin DC current drain per VCC, GND Power dissipation per package Storage temperature Symbol VCC Vin Vout I IK I IK I OK Iout I CC, I GND PT Tstg Rating –0.
5 to +7.
0 –0.
5 to VCC + 0.
5 –0.
5 to VCC + 0.
5 ±20 ±30 ±20 ±25 ±50 500 –65 to +150 Unit V V V mA mA mA mA mA mW °C 4 HD74HC4538 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.
0 220 µA µA I OL = 4 mA I OL = 5.
2 mA Vin = VCC or GND Vin = VCC or GND, QA = QB = GND, Iout = 0 µA Vin = VCC or GND, QA = QB = VCC Pin 2, 14 = 0.
5 VCC V I OH = –4 mA ...


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