Overview
The CD14538BPWR is a dual precision monostable multivibrator produced by Texas Instruments. This component provides stable retriggerable/resettable one-shot operation for any fixed-voltage timing application. It is designed to offer precise control over output pulse widths using external resistor (RX) and capacitor (CX) configurations. The CD14538BPWR is interchangeable with the MC14538 and is pin-compatible with the CD4098B and CD4538B, making it a versatile option for various timing and pulse shaping applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TSSOP (PW) |
| Pins | 16 |
| Operating Temperature Range (°C) | -55 to 125 |
| Minimum External Resistance (RX) | 4 KΩ |
| External Capacitance (CX) Range | 0 pF to 100 µF |
| Trigger and Reset Propagation Delays | Independent of RX and CX |
| Triggering Inputs | Leading-edge-triggering (+TR) and trailing-edge-triggering (-TR) |
| Reset Input | Low level for immediate termination of output pulse |
| Maximum Input Current | 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C |
| Noise Margin | 1 V at VDD= 5 V, 2 V at VDD= 10 V, 2.5 V at VDD= 15 V |
Key Features
- Retriggerable/resettable capability
- Trigger and reset propagation delays independent of RX and CX
- Triggering from leading or trailing edge of input pulse
- Q and Q̄ buffered outputs available
- Separate resets for each section
- Wide range of output-pulse widths
- Schmitt-trigger input allows unlimited rise and fall times on +TR and -TR inputs
- 100% tested for maximum quiescent current at 20 V
- Standardized, symmetrical output characteristics
- Meets all requirements of JEDEC Tentative Standard No. 13B, 'Standard Specifications for Description of 'B' Series CMOS Devices'
Applications
- Pulse delay and timing
- Pulse shaping
Q & A
- What is the CD14538BPWR used for?
The CD14538BPWR is used for providing stable retriggerable/resettable one-shot operation in fixed-voltage timing applications, including pulse delay and timing, and pulse shaping.
- What are the key features of the CD14538BPWR?
Key features include retriggerable/resettable capability, independent trigger and reset propagation delays, leading-edge and trailing-edge triggering, and a wide range of output-pulse widths.
- How is the output pulse width controlled in the CD14538BPWR?
The output pulse width is controlled by adjusting the external resistor (RX) and capacitor (CX) configurations.
- What are the minimum and maximum values for the external resistance (RX) and capacitance (CX)?
The minimum value for RX is 4 KΩ, and the range for CX is from 0 pF to 100 µF.
- What types of packages are available for the CD14538BPWR?
The CD14538BPWR is available in 16-lead TSSOP (PW) packages among others, including hermetic dual-in-line ceramic, dual-in-line plastic, and small-outline packages.
- What is the operating temperature range for the CD14538BPWR?
The operating temperature range is -55°C to 125°C.
- Is the CD14538BPWR RoHS compliant?
- Can the CD14538BPWR replace other similar components?
- How do you calculate the time period (T) for the CD14538BPWR?
The time period (T) can be calculated using the formula T = RXCX.
- What are the noise margin specifications for the CD14538BPWR?
The noise margin is 1 V at VDD= 5 V, 2 V at VDD= 10 V, and 2.5 V at VDD= 15 V.
