HEF4538BT,652

Product Overview

• Category: Integrated Circuit (IC)
• Use: Digital Logic
• Characteristics: Dual Precision Monostable Multivibrator
• Package: SOIC-16
• Essence: Reliable timing control in digital circuits
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 3 V to 15 V
• High-Level Input Voltage: 2 V
• Low-Level Input Voltage: 0.8 V
• Maximum Operating Frequency: 30 MHz
• Propagation Delay Time: 60 ns
• Output Current: 4 mA
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

1. Pin 1: Control Voltage (CV)
2. Pin 2: Reset (R)
3. Pin 3: Q1 Output
4. Pin 4: Ground (GND)
5. Pin 5: Trigger (TR)
6. Pin 6: Threshold (TH)
7. Pin 7: Discharge (DIS)
8. Pin 8: VDD
9. Pin 9: Q2 Output
10. Pin 10: Q2 Complementary Output
11. Pin 11: Q1 Complementary Output
12. Pin 12: Unused
13. Pin 13: Unused
14. Pin 14: Unused
15. Pin 15: Unused
16. Pin 16: Unused

Functional Features

• Dual monostable multivibrator with independent trigger and reset inputs
• Precise timing control for digital circuits
• Adjustable pulse duration using external resistors and capacitors
• Stable operation over a wide range of supply voltages
• Low power consumption
• Schmitt-trigger action on all inputs allows noisy input signals

Advantages and Disadvantages

Advantages

• Dual monostable multivibrator provides flexibility in timing control applications
• Wide supply voltage range allows compatibility with various systems
• Schmitt-trigger action ensures reliable operation even with noisy input signals
• Low power consumption makes it suitable for battery-powered devices

Disadvantages

• Limited maximum operating frequency of 30 MHz
• Propagation delay time of 60 ns may not be suitable for high-speed applications

Working Principles

The HEF4538BT,652 is a dual precision monostable multivibrator IC. It consists of two independent monostable circuits that can be triggered and reset individually. The pulse duration of each monostable circuit is determined by external resistors and capacitors connected to the trigger and threshold pins.

When a trigger signal is applied to the TR pin, the output Q1 goes high for a duration determined by the external components. The Q2 output remains low during this time. After the specified duration, Q1 returns to its low state, and Q2 goes high for a brief period before returning to its low state.

The CV pin allows fine adjustment of the pulse duration by applying a control voltage. The R pin can be used to reset the monostable circuits prematurely, overriding the timing control.

Detailed Application Field Plans

The HEF4538BT,652 finds applications in various digital circuits where precise timing control is required. Some common application areas include:

1. Pulse generation for digital communication systems
2. Timing control in microcontroller-based projects
3. Delay circuits for synchronization purposes
4. Precision timing in industrial automation systems
5. Timer circuits in consumer electronics

Detailed and Complete Alternative Models

1. CD4538BCN: Dual Precision Monostable Multivibrator, DIP-16 package
2. MC14538B: Dual Precision Monostable Multivibrator, SOIC-16 package
3. 74HC4538: Dual Precision Monostable Multivibrator, SOIC-16 package

These alternative models offer similar functionality and can be used as replacements for the HEF4538BT,652 in various applications.

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