74LS122 DIP Retriggerable Monostable Multivibrator With Clear

The 74LS122 is a high speed TTL integrated circuit designed to provide a single output pulse of a specific duration when triggered. This retriggerable monostable multivibrator features an internal timing resistor that allows the device to be used with only an external capacitor for many applications. The output pulse width is determined by the selection of external resistance and capacitance values connected to the timing pins.

The retriggerable nature of this IC means that if a new trigger occurs while the output pulse is active, the timing cycle will restart, effectively extending the pulse duration. It includes DC coupled trigger inputs from both positive going and negative going sources, as well as an overriding direct clear input. This clear function allows the output pulse to be terminated immediately regardless of the timing cycle, providing precise control in complex digital timing circuits.

KEY FEATURES

• Retriggerable operation for extended pulse timing
• Internal timing resistor for simplified circuit design
• Overriding asynchronous clear input for pulse termination
• Positive and negative edge trigger capability
• Low power Schottky technology for high speed performance
• Standard 14 pin dual in line package

SPECIFICATIONS

• Supply Voltage 4.75V to 5.25V
• Operating Temperature 0 to 70 Celsius
• Logic Type TTL Low Power Schottky
• Minimum Input Pulse Width 40ns
• Maximum Output Duty Cycle 0.9
• High Level Output Current -0.4mA
• Low Level Output Current 8mA

INTERFACES

• A1 Trigger input active low
• A2 Trigger input active low
• B1 Trigger input active high
• B2 Trigger input active high
• CLR Clear input active low
• REXT CEXT External resistor and capacitor connection
• CEXT External capacitor connection
• Q Pulse output true
• QBAR Pulse output complementary
• VCC Positive supply voltage
• GND Ground reference