Nexperia USA Inc. 74HC259D,653

Overview

74HC259D,653 from Nexperia is an 8-bit addressable latch IC with four operational modes: addressable latch, memory, 3-to-8 demultiplexing, and reset. It features CMOS-level inputs, operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, and delivers propagation delays as low as 17 ns (VCC = 6.0 V). It is used in digital logic control systems requiring selective parallel output updating via 3-bit address decoding.

For engineers reviewing the 74HC259D,653 datasheet, 74HC259D,653 pinout, 74HC259D,653 application, or 74HC259D,653 equivalent, key selection criteria include its dual function as latch and active-HIGH decoder, TTL-compatible variant (74HCT259), SO16 package thermal performance, and deterministic address-select timing behavior under varying supply voltages.

Technical Context

The device implements a combinational address decoder feeding eight independent D-type latches, each controlled by a 3-bit address (A0–A2) and enabled via active-LOW LE. Its MR input provides synchronous reset across all outputs, while clamp diodes on all inputs permit interfacing with voltages exceeding VCC when current-limiting resistors are used.

Four distinct functional modes are selected by the logic states of LE and MR: addressable latch (LE = LOW, MR = HIGH), memory hold (LE = HIGH, MR = HIGH), demultiplexer (LE = LOW, MR = LOW), and global reset (LE = HIGH, MR = LOW). Output drive capability is ±25 mA per pin at VCC = 4.5 V, with VOH ≥ 3.98 V and VOL ≤ 0.26 V under load.

Key Specifications

Pinout & Package

74HC259D,653 is supplied in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or index area; the package is RoHS-compliant and rated for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC259D,653, the 74HCT259D,653 offers superior input compatibility with older 5 V logic families but requires tighter VCC regulation, while the SN74HC259N sacrifices thermal efficiency and board-space savings for mechanical simplicity in non-production environments.

Availability

74HC259D,653 is available at Aetrix Electronics and suitable for industrial automation, test equipment design, and embedded display interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC259D,653 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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with a focus on reliability, energy efficiency, and automotive-grade qualification.

The 74HC259 belongs to Nexperia's HC-series high-speed CMOS logic family, designed for low-power, noise-immune digital control in industrial, automotive, and consumer applications where deterministic timing and wide supply tolerance are essential.

FAQ

What is the maximum clock frequency supported by 74HC259D,653?

The 74HC259D,653 does not operate on a clock signal; it is edge-triggered by the LE input. Its maximum usable data rate is governed by the minimum LE pulse width (12 ns at VCC = 6.0 V) and setup/hold times (tsu = 14 ns, th = 2 ns). In practice, reliable operation is achievable up to 20 MHz LE toggle frequency with proper layout and decoupling.

Can 74HC259D,653 drive LEDs directly?

Yes - each Qn output can sink or source up to ±25 mA at VCC = 4.5 V, sufficient to drive standard 20 mA LEDs with appropriate current-limiting resistors. For common-anode configurations, connect LED anodes to VCC and cathodes to Qn outputs; for common-cathode, reverse the connection and use Qn as source.

How does the reset (MR) function interact with latch enable (LE)?

MR is asynchronous and dominant: when MR = LOW, all Qn outputs force LOW regardless of LE state, address inputs, or D value. When MR = HIGH, normal operation resumes and LE controls whether new data is latched (LE = LOW) or held (LE = HIGH). No race condition exists between MR and LE transitions.

Is 74HC259D,653 pin-compatible with 74LS259?

No - although both are 8-bit addressable latches, the 74LS259 uses different pin assignments (e.g., Q0–Q7 occupy pins 1–7 and 15, while 74HC259D places them on pins 4–7 and 9–12) and lacks the memory mode. Direct substitution would require PCB redesign and logic-level adaptation due to LS TTL vs. HC CMOS voltage thresholds.