SN74LS123D

Product Overview

Category

SN74LS123D belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for various applications such as timing, pulse generation, and synchronization.

Characteristics

• Low-power Schottky TTL technology
• Dual retriggerable monostable multivibrator
• Wide operating voltage range: 4.75V to 5.25V
• High-speed operation: 16ns typical propagation delay
• Output can source or sink up to 10mA
• Operating temperature range: -40°C to 85°C

Package

SN74LS123D is available in a 16-pin SOIC (Small Outline Integrated Circuit) package.

Essence

The essence of SN74LS123D lies in its ability to generate precise and adjustable time delays or pulses in digital circuits.

Packaging/Quantity

SN74LS123D is typically sold in reels containing 250 units per reel.

Specifications

• Supply Voltage: 4.75V to 5.25V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Maximum Clock Frequency: 33MHz
• Maximum Power Dissipation: 500mW
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

1. CLR (Clear)
2. A (Input A)
3. B (Input B)
4. GND (Ground)
5. RC (Resistor/Capacitor)
6. RE (Retrigger Enable)
7. Q (Output Q)
8. VCC (Supply Voltage)
9. Q' (Complementary Output Q')
10. D (Input D)
11. CP (Clock Pulse)
12. REXT (External Resistor)
13. CEXT (External Capacitor)
14. NC (No Connection)
15. NC (No Connection)
16. VCC (Supply Voltage)

Functional Features

• Retriggerable operation allows for extending the output pulse width by applying additional trigger pulses.
• Monostable multivibrator configuration ensures a stable output pulse regardless of input pulse duration.
• Adjustable timing through external resistor and capacitor values.
• Clear input for immediate termination of the output pulse.

Advantages and Disadvantages

Advantages

• Low-power consumption due to Schottky TTL technology.
• Wide operating voltage range allows compatibility with various digital systems.
• High-speed operation enables precise timing applications.
• Retriggerable feature provides flexibility in pulse generation.

Disadvantages

• Limited maximum clock frequency compared to some modern ICs.
• Requires external components (resistor and capacitor) for timing adjustment.

Working Principles

SN74LS123D operates as a retriggerable monostable multivibrator. When triggered by a positive pulse at the CP (Clock Pulse) input, the output Q goes high for a duration determined by the external resistor and capacitor values. Additional trigger pulses during this period extend the output pulse width. The output remains low until a new trigger pulse is received or the CLR (Clear) input is activated.

Detailed Application Field Plans

SN74LS123D finds applications in various fields, including: 1. Timing circuits in microcontrollers and digital systems. 2. Pulse generation for communication protocols. 3. Synchronization of signals in data transmission. 4. Delay circuits for control systems. 5. Precision timing in scientific instruments.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to SN74LS123D are: 1. 74HC123: High-speed CMOS version with comparable features. 2. CD74HC123: CMOS version with extended operating temperature range. 3. MC74HC123A: Another CMOS alternative with improved noise immunity.

These alternatives can be considered based on specific requirements and compatibility with existing systems.

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