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HD74HC259 Datasheet 8-bit Addressable Latch

Manufacturer: Hitachi Semiconductor (now Renesas)

General Description

The HD74HC259 has a single data input (D), 8 latch outputs (Q0-Q7), 3 address inputs (A, B, and C), a common enable input (E), and a common clear input.

To operate this device as an addressable latch, data is held on the D input, and the address of the latch into which the data is to be entered is held on the A, B and C inputs.

When enable is taken low the data flows through to the addressed output.

Overview

HD74HC259 8-bit Addressable Latch.

Key Features

  • High Speed Operation: tpd (Data to Output) = 16 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Inputs Clear H H L L G L H L H Output of Addressed Latch D Qio D L Each Other Output Qio Qio L L Function Addressable latch Memory 8-line demultiplexer Clear HD74HC259 Select Inputs C L.