M54/74HC259 8-Bit Addressable Latch

Overview

The M54/74HC259 is a high-speed CMOS 8-bit addressable latch fabricated using silicon gate C²MOS technology. This component is designed for applications requiring high-speed data latching and addressable storage. It combines the benefits of CMOS technology, such as low power consumption and high noise immunity, with the speed and functionality of an addressable latch. The device is compatible with standard CMOS and TTL logic levels, making it suitable for interfacing with a wide range of digital systems.

Features

• High-Speed Operation: Optimized for high-speed data transfer and latching operations.
• Low Power Consumption: Leverages CMOS technology for minimal power dissipation.
• 8-Bit Addressable Latch: Provides eight individually addressable latches for flexible data storage.
• Wide Operating Voltage Range: Supports operation from 2V to 6V, accommodating various logic levels.
• High Noise Immunity: CMOS design ensures robust performance in noisy environments.
• TTL Compatibility: Inputs and outputs are compatible with TTL logic levels.
• Three-State Outputs: Features three-state outputs for bus-oriented applications.
• Common Reset: Includes a master reset input for clearing all latches simultaneously.

Applications

The M54/74HC259 is widely used in digital systems where addressable data storage and retrieval are required. Key applications include:

• Memory Addressing: Used in memory systems for address decoding and data latching.
• Data Multiplexing: Facilitates multiplexing of data in communication and signal processing systems.
• Register Storage: Acts as a temporary storage register in microprocessors and microcontrollers.
• Bus Interface: Suitable for bus-oriented systems requiring three-state outputs.
• Industrial Control Systems: Employed in control logic for industrial automation and machinery.
• Consumer Electronics: Used in devices such as TVs, set-top boxes, and gaming consoles for data handling.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7V
• Input Voltage (V_IN): -0.5V to V_CC + 0.5V
• Output Voltage (V_OUT): -0.5V to V_CC + 0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 2V to 6V
• Input High Voltage (V_IH): 3.15V (min) at V_CC = 4.5V
• Input Low Voltage (V_IL): 1.35V (max) at V_CC = 4.5V
• Output High Current (I_OH): -4mA (max)
• Output Low Current (I_OL): 4mA (max)

Dynamic Characteristics

• Propagation Delay (t_PD): 15ns (max) at V_CC = 4.5V
• Output Transition Time (t_THL, t_TLH): 15ns (max) at V_CC = 4.5V
• Setup Time (t_SU): 20ns (min) at V_CC = 4.5V
• Hold Time (t_H): 5ns (min) at V_CC = 4.5V

Package Information

The M54/74HC259 is available in multiple package options to suit different assembly and space requirements. Below are the common package types:

DIP (Dual In-Line Package)

• Package Code: DIP-16
• Dimensions: 19.3mm x 6.35mm
• Pin Count: 16
• Material: Plastic

SOIC (Small Outline Integrated Circuit)

• Package Code: SOIC-16
• Dimensions: 9.9mm x 3.9mm
• Pin Count: 16
• Material: Plastic

TSSOP (Thin Shrink Small Outline Package)

• Package Code: TSSOP-16
• Dimensions: 5mm x 4.4mm
• Pin Count: 16
• Material: Plastic

Pin Configuration

The M54/74HC259 features a 16-pin configuration with the following pinout:

• Pin 1: Data Input (D)
• Pin 2: Output Enable (OE)
• Pin 3: Address Input (A0)
• Pin 4: Address Input (A1)
• Pin 5: Address Input (A2)
• Pin 6: Latch Output (Q0)
• Pin 7: Latch Output (Q1)
• Pin 8: Ground (GND)
• Pin 9: Latch Output (Q2)
• Pin 10: Latch Output (Q3)
• Pin 11: Latch Output (Q4)
• Pin 12: Latch Output (Q5)
• Pin 13: Latch Output (Q6)
• Pin 14: Latch Output (Q7)
• Pin 15: Master Reset (MR)
• Pin 16: Supply Voltage (V_CC)

Functional Description

The M54/74HC259 operates as an 8-bit addressable latch with a common reset function. The device latches data from the input (D) to one of the eight