DM74AS874NT

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Logic Function
• Characteristics: High-speed, TTL-compatible, octal D-type flip-flop with 3-state outputs
• Package: 20-pin plastic dual in-line package (DIP)
• Essence: Flip-flop circuitry for storing and transferring data
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Supply Voltage: 4.75V to 5.25V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: 2.7V (min)
• Low-Level Output Voltage: 0.5V (max)
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 10ns (typical)

Detailed Pin Configuration

1. CLR (Clear) - Active LOW input for clearing the flip-flop
2. D0-D7 (Data Inputs) - Inputs for the eight data bits
3. CP (Clock Pulse) - Input for clock signal
4. OE (Output Enable) - Active LOW output enable control
5. Q0-Q7 (Flip-Flop Outputs) - Outputs for the eight stored data bits
6. GND (Ground) - Ground reference
7. NC (No Connection) - No internal connection
8. Q7' (Complementary Output) - Complementary output of Q7
9. VCC (Supply Voltage) - Positive supply voltage

Functional Features

• High-speed operation allows for efficient data transfer
• TTL-compatible inputs and outputs ensure compatibility with other logic circuits
• 3-state outputs provide flexibility in connecting multiple devices
• Clear input allows for resetting the flip-flop to a known state
• Complementary output provides an inverted version of the Q7 output

Advantages and Disadvantages

Advantages: - High-speed operation enables quick data processing - TTL compatibility allows for easy integration with existing systems - 3-state outputs offer flexibility in connecting multiple devices

Disadvantages: - Limited voltage range (4.75V to 5.25V) may restrict certain applications - 20-pin package size may not be suitable for space-constrained designs

Working Principles

The DM74AS874NT is an octal D-type flip-flop that stores and transfers data using clock signals. When the clock pulse (CP) input transitions from LOW to HIGH, the data present at the D0-D7 inputs is transferred to the corresponding Q0-Q7 outputs. The clear (CLR) input, when activated, clears the flip-flop and sets all outputs to a known state. The output enable (OE) input controls the tri-state outputs, allowing them to be either active or in a high-impedance state.

Detailed Application Field Plans

The DM74AS874NT can be used in various applications, including:

1. Data Storage: The flip-flop functionality makes it suitable for storing data in microprocessors, memory systems, and communication devices.
2. Address Decoding: The outputs can be used for address decoding in memory systems and peripheral devices.
3. Bus Interface: The 3-state outputs facilitate bus interface connections, enabling multiple devices to share a common data bus.
4. Control Systems: The flip-flop can be utilized in control systems for storing and transferring control signals.

Detailed and Complete Alternative Models

1. SN74AS874: Similar octal D-type flip-flop with 3-state outputs, offered by Texas Instruments.
2. CD74AS874: Octal D-type flip-flop with 3-state outputs, available from various manufacturers.
3. MC74AS874: Another alternative octal D-type flip-flop with 3-state outputs, produced by Motorola.

These alternative models provide similar functionality and can be used as substitutes for the DM74AS874NT in various applications.

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