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M74HC4538 Datasheet(PDF) 1 Page - STMicroelectronics |
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M74HC4538 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 14 page M54HC4538 M74HC4538 October 1993 DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR B1R (Plastic Package) ORDER CODES : M54HC4538F1R M74HC4538M1R M74HC4538B1R M74HC4538C1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) NC = No Internal Connection . HIGH SPEED tPD = 25 ns (TYP.) AT VCC =5 V . LOW POWER DISSIPATION STANDBY STATEICC =4 µA(MAX.) ATTA =25°C ACTIVE STATE ICC =200 µA (TYP.)ATVCC =5 V . HIGH NOISE IMMUNITY VNIH =VNIL =28 % VCC (MIN.) . OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS . BALANCED PROPAGATION DELAYS tPLH =tPHL . WIDE OUTPUT PULSE WIDTH RANGE tWOUT = 120 ns ~ 60 s OVER AT VCC = 4.5 V . OUTPUT PULSE WIDTH INDEPENDENT FROM TRIGGER INPUT PULSE WIDTH . PIN AND FUNCTION COMPATIBLE WITH 4538B The M54/74HC4538 is a high speed CMOS DUAL MONOSTABLEMULTIVIBRATOR fabricated in sili- con gate C 2MOS technology. It has the same high speed performance of LSTTL combined with true CMOS low power consumption. Each multivibrator features both a negative, A, and a positive, B, edge triggered input, either of which can be used as an in- hibit input. Also included is a clear input that when taken low resets the one shot. The monostable multivibrators are retriggerable. That is, they may be triggered reapeatedly while their outputs are gener- ating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature and supply is achieved using linear CMOS techniques. The output pulse equation is simply : PW = 0.7 (R)(C) where PW is in seconds, R in Ohms, and C is in Farads. All inputs are equipped with protection circuits against static discharge and transient excess volt- age. DESCRIPTION 1/14 |
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