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Part Name(s) : HD74LS123
Hitachi
Hitachi -> Renesas Electronics
Description : Dual RETRIGGERABLE MONOSTABLE MULTIVIBRATORS (with Clear)

Dual RETRIGGERABLE MONOSTABLE MULTIVIBRATORS (with Clear)

Renesas
Renesas Electronics
Description : Dual RETRIGGERABLE MONOSTABLE MULTIVIBRATORS (with Clear)

Dual RETRIGGERABLE MONOSTABLE MULTIVIBRATORS (with Clear)

This d-c triggered multivibrator features output pulse width control by three method. The basic pulse time is programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse width may be extended by retriggering the gated low-level -active (A) or high-level active (B) inputs, or be reduced by use of the overriding clear. Figure 1 illustrates pulse control by retriggering and early clear. This device is provided enough Schmitt hysteresis to ensure jitter-free triggering from the B input with transition rates as slow as 0.1 mV/ns.

Part Name(s) : SN74LS122ML1
ON-Semiconductor
ON Semiconductor
Description : RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

These dc triggered MULTIVIBRATORS feature pulse width control by three methods. The basic pulse width is programmed by selection of external resistance and capacitance values. The LS122 has an internal timing resistor that allows the circuits to be used with only an external capacitor. Once triggered, the basic pulse width may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear.
   
• Overriding Clear Terminates Output Pulse
• Compensated for VCC and Temperature Variations
• DC Triggered from Active-High or Active-Low Gated Logic Inputs
RETRIGGERABLE for Very Long Output Pulses, up to 100% Duty Cycle
• Internal Timing Resistors on LS122
   

ON-Semiconductor
ON Semiconductor
Description : RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

These dc triggered MULTIVIBRATORS feature pulse width control by three methods. The basic pulse width is programmed by selection of external resistance and capacitance values. The LS122 has an internal timing resistor that allows the circuits to be used with only an external capacitor. Once triggered, the basic pulse width may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear.

• Overriding Clear Terminates Output Pulse
• Compensated for VCC and Temperature Variations
• DC Triggered from Active-High or Active-Low Gated Logic Inputs
RETRIGGERABLE for Very Long Output Pulses, up to 100% Duty Cycle
• Internal Timing Resistors on LS122

Part Name(s) : 74HC4538
Toshiba
Toshiba
Description : DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR

Description : RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

These dc triggered MULTIVIBRATORS feature pulse width control by three methods. The basic pulse width is programmed by selection of external resistance and capacitance values. The LS122 has an internal timing resistor that allows the circuits to be used with only an external capacitor. Once triggered, the basic pulse width may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear.

• Overriding Clear Terminates Output Pulse
• Compensated for VCC and Temperature Variations
• DC Triggered from Active-High or Active-Low Gated Logic Inputs
RETRIGGERABLE for Very Long Output Pulses, up to 100% Duty Cycle
• Internal Timing Resistors on LS122

Description : High Speed CMOS Logic Dual RETRIGGERABLE MONOSTABLE MULTIVIBRATORS with Resets

Description
The Harris CD74HC123, CD74HCT123, 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 CX provides 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.

Features
• Overriding Reset Terminates Output Pulse
• Triggering From the Leading or Trailing Edge
• Q and Q Buffered Outputs
• Separate Resets
• Wide Range of Output-Pulse Widths
• Schmitt Trigger on Both A and B Inputs
• Fanout (Over Temperature Range)
   - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
   - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
   - 2V to 6V Operation
   - High Noise Immunity: NIL = 30%, NIH = 30%of VCC at VCC = 5V
• HCT Types
   - 4.5V to 5.5V Operation
   - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min)
   - CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH

 

Part Name(s) : HD74HC4538 74HC4538
Hitachi
Hitachi -> Renesas Electronics
Description : Dual Precision RETRIGGERABLE/Resettable MONOSTABLE MULTIVIBRATORS

Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one short. The HD74HC4538 is RETRIGGERABLE. That is, it may be triggered repeatedly while their outputs are generating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature. The output pulse equation is simply: tw= 0.7 (R)(C).

Features
•  High Speed Operation: tpd(A or B to Y) = 22 ns typ (CL= 50 pF)
•  High Output Current: Fanout of 10 LSTTL Loads
•  Wide Operating Voltage: VCC= 2 to 6 V
•  Low Input Current: 1 µA max
•  Low Quiescent Supply Current

 

System-Logic
System Logic Semiconductor
Description : Dual RETRIGGERABLE MONOSTABLE Multivibrator

Dual RETRIGGERABLE MONOSTABLE Multivibrator

The SL74HC123 is identical in pinout to the LS/ALS123. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs.
There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/falling signals.
The device may also be triggered by using the CLR input (positiveedge) because of the Schmitt-trigger input; after triggering the output maintains the MONOSTABLE state for the time period determined by the external resistor RX and capacitor CX. Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer.

 • Outputs Directly Interface to CMOS, NMOS, and TTL
 • Operating Voltage Range: 3.0 to 6.0 V
 • Low Input Current: 1.0 μA
 • High Noise Immunity Characteristic of CMOS Devices

SLS
System Logic Semiconductor
Description : Dual RETRIGGERABLE MONOSTABLE Multivibrator

Dual RETRIGGERABLE MONOSTABLE Multivibrator

The SL74HC123 is identical in pinout to the LS/ALS123. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs.
There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/falling signals.
The device may also be triggered by using the CLR input (positiveedge) because of the Schmitt-trigger input; after triggering the output maintains the MONOSTABLE state for the time period determined by the external resistor RX and capacitor CX. Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer.

 • Outputs Directly Interface to CMOS, NMOS, and TTL
 • Operating Voltage Range: 3.0 to 6.0 V
 • Low Input Current: 1.0 μA
 • High Noise Immunity Characteristic of CMOS Devices

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