74HC/HCT221 Dual Non-retriggerable Monostable Multivibrator With Reset

The 74HC/HCT221 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC/HCT221 are dual non-retriggerable Monostable Multivibrators Each multivibrator features an active LOW-going edge input (nA) and an active HIGH-going edge input (nB), either of which CAN be used as an enable input.Pulse triggering occurs at a particular Voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry for the nB inputs allow jitter-free triggering from inputs with slow transition rates, providing the circuit with excellent noise immunity.Once triggered, the outputs (nQ, nQ) are independent of further transitions of nA and nB inputs and are a function of the Timing components. The output pulses CAN be terminated by the overriding active LOW reset inputs (nRD ). Input pulses may be of any duration relative to the output pulse.Pulse width stability is achieved through internal compensation and is virtually independent of Vcc and temperature. In most applications pulse stability will only be limited by the accuracy of the external Timing components.The output pulse width is defined by the following relationship:tW =CEXT REXT In2 tW = 0.7CEXT REXT Pin assignments for the '221'are identical to those of the '123' so that the '221' CAN be substituted for those products in systems not using the retrigger by merely changing the value of REXT and/or CEXT .
By NXP Semiconductors
Part Manufacturer Description Datasheet Samples
CD74HC221EE4 Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-PDIP -55 to 125
CD74HC221NSR Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-SO -55 to 125
CD74HC221PWTE4 Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-TSSOP -55 to 125
CD74HC221MG4 Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-SOIC -55 to 125
CD74HC221PWR Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-TSSOP -55 to 125
CD74HC221M Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-SOIC -55 to 125
CD74HC221NSRE4 Texas Instruments HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, GREEN, PLASTIC, SOP-16
CD74HC221PWTG4 Texas Instruments HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, GREEN, PLASTIC, TSSOP-16
CD74HC221ME4 Texas Instruments HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, GREEN, PLASTIC, MS-012AC, SOIC-16
CD74HC221PWG4 Texas Instruments High Speed CMOS Logic Dual Monostable Multivibrators with Reset 16-TSSOP -55 to 125
74HC221 's Packages74HC221 's pdf datasheet
74HC221D SO
74HC221DB SSOP
74HC221N DIP
74HCT221D SO
74HCT221DB SSOP
74HCT221N DIP




74HC221 Pinout, Pinouts
74HC221 pinout,Pin out
This is one package pinout of 74HC221,If you need more pinouts please download 74HC221's pdf datasheet.

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