CD74HC123 Series

High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset

Link to Manufacturer Page: https://www.ti.com/

Catalog

High Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Reset

Part	Logic Type	Mounting Type	Voltage - Supply [Max]	Voltage - Supply [Min]	Independent Circuits	Current - Output High, Low	Package / Case [x]	Package / Case	Package / Case [x]	Supplier Device Package	Propagation Delay	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case
Texas Instruments CD74HC123PWT	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA	0.173 "	16-TSSOP	4.4 mm	16-TSSOP	25 ns	-55 °C	125 °C
Texas Instruments CD74HC123M	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA		16-SOIC		16-SOIC	25 ns	-55 °C	125 °C	0.154 in, 3.9 mm Width
Texas Instruments CD74HC123E	Monostable	Through Hole	6 V	2 V	2	5.2 mA, 5.2 mA		16-DIP		16-PDIP	25 ns	-55 °C	125 °C	0.3 in, 7.62 mm
Texas Instruments CD74HC123NSR	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA		16-SOIC (0.209", 5.30mm Width)		16-SO	25 ns	-55 °C	125 °C
Texas Instruments CD74HC123PW	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA	0.173 "	16-TSSOP	4.4 mm	16-TSSOP	25 ns	-55 °C	125 °C
Texas Instruments CD74HC123PWRG4	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA	0.173 "	16-TSSOP	4.4 mm	16-TSSOP	25 ns	-55 °C	125 °C
Texas Instruments CD74HC123M96	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA		16-SOIC		16-SOIC	25 ns	-55 °C	125 °C	0.154 in, 3.9 mm Width
Texas Instruments CD74HC123PWR	Monostable	Surface Mount	6 V	2 V	2	5.2 mA, 5.2 mA	0.173 "	16-TSSOP	4.4 mm	16-TSSOP	25 ns	-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.