74HC221 Series

High Speed CMOS Logic Dual Monostable Multivibrators with Reset

Catalog(6 parts)

Part	Mounting Type	Supplier Device Package	Package / Case	Package / Case▲▼	Logic Type	Current - Output High, Low▲▼	Independent Circuits▲▼	Voltage - Supply▲▼	Voltage - Supply▲▼	Operating Temperature▲▼	Operating Temperature▲▼	Propagation Delay▲▼	Package / Case▲▼	Package / Case▲▼
Texas Instruments CD74HC221MT Monostable Multivibrator 18 ns 16-SOIC	Surface Mount	16-SOIC	16-SOIC	0.003911599982529879 m, 3.900000095367432 ul	Monostable	0.005200000014156103 A, 0.005200000014156103 A	2 ul	6 V	2 V	-55 °C	125 °C	1.7999999712969842e-8 s
Texas Instruments CD74HC221E Monostable Multivibrator 18 ns 16-PDIP	Through Hole	16-PDIP	16-DIP	0.007619999814778566 m, 0.007619999814778566 m	Monostable	0.005200000014156103 A, 0.005200000014156103 A	2 ul	6 V	2 V	-55 °C	125 °C	1.7999999712969842e-8 s
Texas Instruments CD74HC221M96 Monostable Multivibrator 18 ns 16-SOIC	Surface Mount	16-SOIC	16-SOIC	0.003911599982529879 m, 3.900000095367432 ul	Monostable	0.005200000014156103 A, 0.005200000014156103 A	2 ul	6 V	2 V	-55 °C	125 °C	1.7999999712969842e-8 s
Texas Instruments CD74HC221PW Monostable Multivibrator 18 ns 16-TSSOP	Surface Mount	16-TSSOP	16-TSSOP		Monostable	0.005200000014156103 A, 0.005200000014156103 A	2 ul	6 V	2 V	-55 °C	125 °C	1.7999999712969842e-8 s	0.004394200164824724 m	0.004399999976158142 m
Texas Instruments CD74HC221MG4 Monostable Multivibrator 18 ns 16-SOIC	Surface Mount	16-SOIC	16-SOIC	0.003911599982529879 m, 3.900000095367432 ul	Monostable	0.005200000014156103 A, 0.005200000014156103 A	2 ul	6 V	2 V	-55 °C	125 °C	1.7999999712969842e-8 s
Texas Instruments CD74HC221NSR Monostable Multivibrator 18 ns 16-SO	Surface Mount	16-SO	16-SOIC (0.209", 5.30mm Width)		Monostable	0.005200000014156103 A, 0.005200000014156103 A	2 ul	6 V	2 V	-55 °C	125 °C	1.7999999712969842e-8 s

Key Features

• Overriding RESET Terminates Output PulseTriggering from the Leading or Trailing EdgeQ and Q\ Buffered OutputsSeparate ResetsWide Range of Output-Pulse WidthsSchmitt Trigger on B InputsFanout (Over Temperature Range)Standard Outputs . . . . 10 LSTTL LoadsBus Driver Outputs . . . . 15 LSTTL LoadsWide Operating Temperature Range . . . –55°C to 125°CBalanced Propagation Delay and Transition TimesSignificant Power Reduction Compared to LSTTL Logic ICsHC Types2V to 6V OperationHigh Noise Immunity: NIL= 30%, NIH= 30% of VCCat VCC= 5VHCT Types4.5V to 5.5V OperationDirect LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH= 2V (Min)CMOS Input Compatibility, Il1µA at VOL, VOHData sheet acquired from Harris SemiconductorOverriding RESET Terminates Output PulseTriggering from the Leading or Trailing EdgeQ and Q\ Buffered OutputsSeparate ResetsWide Range of Output-Pulse WidthsSchmitt Trigger on B InputsFanout (Over Temperature Range)Standard Outputs . . . . 10 LSTTL LoadsBus Driver Outputs . . . . 15 LSTTL LoadsWide Operating Temperature Range . . . –55°C to 125°CBalanced Propagation Delay and Transition TimesSignificant Power Reduction Compared to LSTTL Logic ICsHC Types2V to 6V OperationHigh Noise Immunity: NIL= 30%, NIH= 30% of VCCat VCC= 5VHCT Types4.5V to 5.5V OperationDirect LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH= 2V (Min)CMOS Input Compatibility, Il1µA at VOL, VOHData sheet acquired from Harris Semiconductor

Description

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. 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.