MC74VHC259DR2G

Overview

Category: Integrated Circuit (IC)

Use: Data Storage and Control

Characteristics: - High-Speed CMOS Logic - 8-Bit Addressable Latch/Shift Register - Wide Operating Voltage Range: 2.0V to 5.5V - Low Power Consumption - Schmitt Trigger Inputs for Noise Immunity - Balanced Propagation Delays - Direct Interface with TTL Levels - Multiple Package Options Available

Package: SOIC-16

Essence: The MC74VHC259DR2G is an integrated circuit that combines an 8-bit addressable latch and a shift register. It is designed to store and control data in various applications.

Packaging/Quantity: The MC74VHC259DR2G is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.0V to 5.5V
• Input Voltage Range: -0.5V to VCC + 0.5V
• Output Voltage Range: -0.5V to VCC + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 200MHz

Pin Configuration

The MC74VHC259DR2G has a total of 16 pins, which are assigned specific functions as follows:

1. GND (Ground)
2. D0 (Data Input 0)
3. D1 (Data Input 1)
4. D2 (Data Input 2)
5. D3 (Data Input 3)
6. D4 (Data Input 4)
7. D5 (Data Input 5)
8. D6 (Data Input 6)
9. D7 (Data Input 7)
10. MR (Master Reset)
11. SH/LD (Shift/Load)
12. CLK (Clock Input)
13. Q0 (Output 0)
14. Q1 (Output 1)
15. Q2 (Output 2)
16. VCC (Supply Voltage)

Functional Features

The MC74VHC259DR2G offers the following functional features:

• Addressable Latch: The IC can store data at each latch output based on the address provided.
• Shift Register: It can shift the stored data in a serial manner.
• Master Reset (MR): Allows resetting all latches to their initial state.
• Shift/Load (SH/LD): Determines whether the IC operates in shift or load mode.
• Clock Input (CLK): Controls the timing of data storage and shifting operations.

Advantages and Disadvantages

Advantages: - High-speed operation - Wide operating voltage range - Low power consumption - Noise immunity due to Schmitt trigger inputs - Direct interface with TTL levels

Disadvantages: - Limited number of addressable latches (8-bit)

Working Principles

The MC74VHC259DR2G operates by receiving data inputs (D0-D7) and an address signal. When the shift/load (SH/LD) input is low, the IC functions in the shift mode. In this mode, the clock input (CLK) controls the shifting of data through the latch and shift register stages.

When the SH/LD input is high, the IC operates in the load mode. In this mode, the data inputs are latched and stored based on the address provided. The stored data can then be accessed from the corresponding outputs (Q0-Q2).

Detailed Application Field Plans

The MC74VHC259DR2G finds applications in various fields, including:

1. Data Storage Systems: Used for temporary storage of data in microcontrollers, microprocessors, and digital systems.
2. Address Decoding: Enables efficient address decoding in memory systems and peripheral devices.
3. Serial-to-Parallel Conversion: Converts serial data streams into parallel data for further processing.
4. Data Multiplexing: Allows multiple data sources to share a common bus by selecting one at a time based on the address.

Detailed and Complete Alternative Models

1. 74HC259: Similar functionality but operates at a lower voltage range (2.0V to 6.0V).
2. CD74HCT259E: Compatible alternative with TTL-level inputs and higher operating temperature range (-55°C to +125°C).
3. SN74LV595A: Offers an extended number of addressable latches (8-bit) and operates at a lower voltage range (1.65V to 5.5V).

These alternative models provide similar functionalities to the MC74VHC259DR2G and can be considered based on specific requirements.

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