74HC423 Series

High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset

Catalog(3 parts)

Part	Independent Circuits▲▼	Package / Case	Package / Case▲▼	Voltage - Supply▲▼	Voltage - Supply▲▼	Logic Type	Mounting Type	Supplier Device Package	Propagation Delay▲▼	Current - Output High, Low▲▼	Operating Temperature▲▼	Operating Temperature▲▼
Texas Instruments CD74HC423MT Monostable Multivibrator 25 ns 16-SOIC	2 ul	16-SOIC	0.003911599982529879 m, 3.900000095367432 ul	6 V	2 V	Monostable	Surface Mount	16-SOIC	2.5000000292152436e-8 s	0.005200000014156103 A, 0.005200000014156103 A	-55 °C	125 °C
Texas Instruments CD74HC423NSR Monostable Multivibrator 25 ns 16-SO	2 ul	16-SOIC (0.209", 5.30mm Width)		6 V	2 V	Monostable	Surface Mount	16-SO	2.5000000292152436e-8 s	0.005200000014156103 A, 0.005200000014156103 A	-55 °C	125 °C
Texas Instruments CD74HC423M96 Monostable Multivibrator 25 ns 16-SOIC	2 ul	16-SOIC	0.003911599982529879 m, 3.900000095367432 ul	6 V	2 V	Monostable	Surface Mount	16-SOIC	2.5000000292152436e-8 s	0.005200000014156103 A, 0.005200000014156103 A	-55 °C	125 °C

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 Both A\ and 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, VOHOverriding Reset Terminates Output PulseTriggering From the Leading or Trailing EdgeQ and Q\ Buffered OutputsSeparate ResetsWide Range of Output-Pulse WidthsSchmitt Trigger on Both A\ and 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, VOH

Description

The ’HC123, ’HCT123, CD74HC423 and CD74HCT423 are dual monostable multivibrators with resets. They are all retriggerable and differ only in that the 123 types can be triggered by a negative to positive reset pulse; whereas the 423 types do not have this feature. An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit. Adjustment of Rx and CXprovides a wide range of output pulse widths from the Q and Q\ terminals. Pulse triggering on the A\ and B inputs occur at a particular voltage level and is not related to the rise and fall times of the trigger pulses. Once triggered, the output pulse width may be extended by retriggering inputs 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. If either Mono is not used each input on the unused device (A\, B, and R\) must be terminated high or low. The minimum value of external resistance, Rx is typically 5k. The minimum value external capacitance, CX, is 0pF. The calculation for the pulse width is tW= 0.45 RXCXat VCC= 5V. The ’HC123, ’HCT123, CD74HC423 and CD74HCT423 are dual monostable multivibrators with resets. They are all retriggerable and differ only in that the 123 types can be triggered by a negative to positive reset pulse; whereas the 423 types do not have this feature. An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit. Adjustment of Rx and CXprovides a wide range of output pulse widths from the Q and Q\ terminals. Pulse triggering on the A\ and B inputs occur at a particular voltage level and is not related to the rise and fall times of the trigger pulses. Once triggered, the output pulse width may be extended by retriggering inputs 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. If either Mono is not used each input on the unused device (A\, B, and R\) must be terminated high or low. The minimum value of external resistance, Rx is typically 5k. The minimum value external capacitance, CX, is 0pF. The calculation for the pulse width is tW= 0.45 RXCXat VCC= 5V.