Specification	CD74HCT221M

Current - Output High, Low [custom]	4 mA
Current - Output High, Low [custom]	4 mA
Independent Circuits	2
Logic Type	Monostable
Mounting Type	Surface Mount
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-55 °C
Package / Case	16-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Propagation Delay	18 ns
Schmitt Trigger Input	True
Supplier Device Package	16-SOIC
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	4.5 V

CD74HCT221 Series

High Speed CMOS Logic Dual Monostable Multivibrators with Reset

Part	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Independent Circuits	Logic Type	Operating Temperature [Min]	Operating Temperature [Max]	Propagation Delay	Package / Case	Package / Case [x]	Package / Case [y]	Supplier Device Package	Package / Case	Package / Case
Texas Instruments CD74HCT221MT	4 mA	4 mA	4.5 V	5.5 V	Surface Mount	2	Monostable	-55 °C	125 °C	18 ns	16-SOIC	0.154 in	3.9 mm	16-SOIC
Texas Instruments CD74HCT221E	4 mA	4 mA	4.5 V	5.5 V	Through Hole	2	Monostable	-55 °C	125 °C	18 ns	16-DIP			16-PDIP	0.3 in	7.62 mm
Texas Instruments CD74HCT221M	4 mA	4 mA	4.5 V	5.5 V	Surface Mount	2	Monostable	-55 °C	125 °C	18 ns	16-SOIC	0.154 in	3.9 mm	16-SOIC
Texas Instruments CD74HCT221MG4	4 mA	4 mA	4.5 V	5.5 V	Surface Mount	2	Monostable	-55 °C	125 °C	18 ns	16-SOIC	0.154 in	3.9 mm	16-SOIC
Texas Instruments CD74HCT221EG4	4 mA	4 mA	4.5 V	5.5 V	Through Hole	2	Monostable	-55 °C	125 °C	18 ns	16-DIP			16-PDIP	0.3 in	7.62 mm
Texas Instruments CD74HCT221M96	4 mA	4 mA	4.5 V	5.5 V	Surface Mount	2	Monostable	-55 °C	125 °C	18 ns	16-SOIC	0.154 in	3.9 mm	16-SOIC

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 1.32
		431	$ 0.70
Texas Instruments	TUBE	1	$ 0.98
		100	$ 0.75
		250	$ 0.55
		1000	$ 0.40

Description

General part information

CD74HCT221 Series

The ’HC221 and CD74HCT221 are dual monostable multivibrators with reset. An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit. Adjustment of RXand CXprovides a wide range of output pulse widths from the Q and Q\ terminals. Pulse triggering on the B input occurs at a particular voltage level and is not related to the rise and fall time of the trigger pulse.

Once triggered, the outputs are independent of further trigger inputs on A\ and B. The output pulse can be terminated by a LOW level on the Reset (R)\ pin. Trailing Edge triggering (A)\ and leading-edge-triggering (B) inputs are provided for triggering from either edge of the input pulse. On power up, the IC is reset. If either Mono is not used each input (on the unused device) must be terminated either high or low.

The minimum value of external resistance, RX, is typically 500. The minimum value of external capacitance, CX, is 0pF. The calculation for the pulse width is tW= 0.7 RXCXat VCC= 4.5V.

Documents

Technical documentation and resources

CD54HC221, CD74HC221, CD74HCT221 datasheet (Rev. F)

Data sheet