74HCT4538 Series
High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrators
Manufacturer: Texas Instruments
Catalog(1 parts)
| Part | Supplier Device Package | Package / Case▲▼ | Package / Case | Schmitt Trigger Input▲▼ | Mounting Type | Logic Type | Propagation Delay▲▼ | Current - Output High, Low▲▼ | Operating Temperature▲▼ | Operating Temperature▲▼ | Independent Circuits▲▼ | Voltage - Supply▲▼ | Voltage - Supply▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
16-PDIP | 0.007619999814778566 m, 0.007619999814778566 m | 16-DIP | Through Hole | Monostable | 2.3000000126671697e-8 s | 0.004000000189989805 A, 0.004000000189989805 A | -55 °C | 125 °C | 2 ul | 5.5 V | 4.5 V |
Key Features
• Retriggerable/Resettable CapabilityTrigger and Reset Propagation Delays Independent of RX, CXTriggering from the Leading or Trailing EdgeQ and Q\ Buffered Outputs AvailableSeparate ResetsWide Range of Output Pulse WidthsSchmitt Trigger Input on A and B\ InputsRetrigger Time is Independent of CXFanout (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, VOHRetriggerable/Resettable CapabilityTrigger and Reset Propagation Delays Independent of RX, CXTriggering from the Leading or Trailing EdgeQ and Q\ Buffered Outputs AvailableSeparate ResetsWide Range of Output Pulse WidthsSchmitt Trigger Input on A and B\ InputsRetrigger Time is Independent of CXFanout (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
AI
The ’HC4538 and ’HCT4538 are dual retriggerable/resettable monostable precision multivibrators for fixed voltage timing applications. 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. The propagation delay from trigger input-to-output transition and the propagation delay from reset input-to-output transition are independent of RXand CX.
Leading-edge triggering (A) and trailing edge triggering (B)\ inputs are provided for triggering from either edge of the input pulse. An unused "A" input should be tied to GND and an unused B\ should be tied to VCC. On power up the IC is reset. Unused resets and sections must be terminated. In normal operation the circuit retriggers on the application of each new trigger pulse. To operate in the non-triggerable mode Q\ is connected to B\ when leading edge triggering (A) is used or Q is connected to A when trailing edge triggering (B)\ is used. The period (. CMINis 0pF.
The ’HC4538 and ’HCT4538 are dual retriggerable/resettable monostable precision multivibrators for fixed voltage timing applications. 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. The propagation delay from trigger input-to-output transition and the propagation delay from reset input-to-output transition are independent of RXand CX.
Leading-edge triggering (A) and trailing edge triggering (B)\ inputs are provided for triggering from either edge of the input pulse. An unused "A" input should be tied to GND and an unused B\ should be tied to VCC. On power up the IC is reset. Unused resets and sections must be terminated. In normal operation the circuit retriggers on the application of each new trigger pulse. To operate in the non-triggerable mode Q\ is connected to B\ when leading edge triggering (A) is used or Q is connected to A when trailing edge triggering (B)\ is used. The period (. CMINis 0pF.