Nexperia USA Inc. 74HC259D,652

Overview

74HC259D,652 from Nexperia is an 8-bit addressable latch IC with four operational modes: addressable latch, memory, 3-to-8 demultiplexing, and reset. It operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, features CMOS-level inputs, and delivers 8 individually accessible latched outputs (Q0–Q7) for precise data routing in digital control systems.

For engineers reviewing the 74HC259D,652 datasheet, 74HC259D,652 pinout, 74HC259D,652 application, or 74HC259D,652 equivalent, this device serves as a serial-to-parallel interface with random-access write capability, active-HIGH 3-to-8 decoding, and deterministic reset behavior - critical for I/O expansion, LED matrix addressing, and programmable logic control.

Technical Context

The 74HC259D implements a combinational address decoder coupled with eight transparent D-type latches, enabling selective update of one output per LE transition while retaining others. Its MR input forces all Qn outputs LOW asynchronously, independent of LE or address state.

Mode selection is determined solely by the logic levels on LE and MR: LE = LOW + MR = HIGH enables addressable latch mode; LE = HIGH + MR = HIGH activates memory mode; LE = LOW + MR = LOW enables demultiplexer mode; LE = HIGH + MR = LOW triggers reset mode. No internal clock is required - operation is purely level- and edge-sensitive on LE.

Key Specifications

Pinout & Package

74HC259D,652 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch - compatible with automated PCB assembly and IPC-7351B land patterns.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit addressable latch applications.

Compared with 74HC259D,652, the 74HCT259D,653 offers guaranteed TTL input compatibility at the cost of marginally higher supply current, while SN74HC259N sacrifices automotive-grade temperature range for through-hole assembly convenience - neither is pin- or functionally identical across full environmental and interface specifications.

Availability

74HC259D,652 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, LED signage controllers, and programmable logic modules requiring stable component supply across extended temperature ranges.

Supply support for 74HC259D,652 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC259D belongs to Nexperia's 74HC high-speed CMOS logic family, engineered for low-power, wide-supply-voltage digital interfacing in space-constrained and thermally demanding applications.

FAQ

What is the function of the MR pin, and is it asynchronous?

The MR (Master Reset) pin is an asynchronous active-LOW input that forces all eight outputs (Q0–Q7) to LOW immediately, regardless of LE, address, or data states. It overrides all other control inputs and requires no clock or enable condition - making it ideal for fail-safe initialization and emergency shutdown sequences in safety-critical logic paths.

Can the 74HC259D operate as a standalone 3-to-8 decoder without external latching?

Yes - when configured in demultiplexer mode (MR = LOW, LE = LOW), the device acts as an active-HIGH 3-to-8 decoder: the D input appears at the selected Qn output (determined by A0–A2), while all unselected outputs remain LOW. No external latch or clock is needed, and propagation delay remains consistent at ≤37 ns (VCC = 4.5 V).

How does the addressable latch mode differ from standard 8-bit latch behavior?

In addressable latch mode (MR = HIGH, LE = LOW → HIGH), only the latch selected by A0–A2 updates to follow the D input on the LE rising edge; all other latches retain their prior state. This enables random-write capability - unlike a standard octal latch where all outputs update simultaneously - allowing partial register updates without disturbing existing data.

Are the Q0–Q7 outputs capable of driving LEDs directly?

Yes - each Qn output can source up to 4.0 mA (VOH ≥ 3.98 V @ VCC = 4.5 V) and sink up to 5.2 mA (VOL ≤ 0.26 V). This permits direct connection of common-anode LEDs (with current-limiting resistor to VCC) or common-cathode LEDs (with resistor to GND), supporting typical indicator and display applications without external buffer stages.