ON Semiconductor MC74ACT259D: 8-Bit Addressable Latch

The ON Semiconductor MC74ACT259D is a high-performance, 8-bit addressable latch designed for use in a wide range of digital applications. This integrated circuit is part of the AC/ACT family, which is known for its high-speed operation and compatibility with TTL (Transistor-Transistor Logic) levels. The MC74ACT259D offers a convenient and flexible method for switching and controlling multiple data lines with a minimal number of pins.

Constructed with BiCMOS technology, the MC74ACT259D latch operates with a supply voltage range of 4.5V to 5.5V, making it suitable for interfacing with 5V digital systems. This device is capable of working at high speeds while maintaining low power consumption, a characteristic that is essential for power-sensitive designs.

The MC74ACT259D provides eight individually addressable latches, which can be controlled through a common data input (D), three address inputs (A0, A1, and A2), and a write enable input (G). The address inputs determine which latch is to be accessed, while the write enable input enables the data at the D input to be written into the selected latch when asserted low.

Additionally, the device features an active-low Master Reset (MR) input that, when asserted, clears all latches simultaneously, regardless of the state of the address or write enable inputs. This feature is particularly useful for initializing the system or resetting the circuit during power-up or after an error condition.

The MC74ACT259D is housed in a 16-pin SOIC package, which is well-suited for space-constrained applications. The compact form factor, combined with the device's low power dissipation and high-speed operation, makes it an excellent choice for a variety of digital systems, including microprocessor/microcontroller interfaces, control systems, and data routing applications.

With its robust design and ON Semiconductor's reputation for reliability, the MC74ACT259D is a versatile component that delivers consistent performance for digital designers looking to manage multiple outputs with precision and ease.

Key Features:

• 8-bit addressable latch
• Compatible with TTL levels
• Operating voltage range: 4.5V to 5.5V
• High-speed operation
• Low power consumption
• Three address inputs for latch selection
• Active-low Master Reset input
• 16-pin SOIC package