NXP Semiconductors 74HCT563D,653

Overview

74HCT563D,653 from Nexperia (formerly Philips Semiconductors) is an octal D-type transparent latch with inverting 3-state outputs, designed for bus-oriented digital systems. It features common latch enable (LE, active HIGH) and output enable (OE, active LOW), 8-bit data latching capability, propagation delay of 19 ns (typ.) at VCC = 4.5 V, and CMOS-compatible TTL input thresholds. It is used in microprocessor data bus interfacing where output inversion and high-impedance control are required.

For engineers reviewing the 74HCT563D,653 datasheet, 74HCT563D,653 pinout, 74HCT563D,653 application, or 74HCT563D,653 equivalent, key selection criteria include inverting 3-state output behavior, LE/OE timing coordination, bus driver output capability, and compatibility with 5 V TTL logic families in legacy industrial and embedded control designs.

Technical Context

The 74HCT563D,653 implements eight independent D-type transparent latches sharing a single LE input and a common OE control. Its operation is defined by two orthogonal control signals: LE governs data capture (transparent when HIGH, latched on HIGH-to-LOW transition), while OE independently enables/disables all Q0–Q7 outputs without affecting latch state.

It uses Si-gate CMOS technology with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), supports 5 V ±10% supply, and delivers bus-driver-level output current (±6 mA at VCC = 4.5 V). The device belongs to the MSI logic category and complies with JEDEC standard no. 7A.

Key Specifications

Pinout & Package

74HCT563D,653 is supplied in a 20-pin SO20 (Small Outline) package per JEDEC MS-013, with 0.65 mm lead pitch and body width of 7.5 mm. Pin numbering follows standard dual-in-line orientation with pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting latch applications.

Compared with 74HCT563D,653, the 74HCT573D,653 offers identical functionality except output polarity, while SN74HCT563N provides identical logic in a through-hole package-both require no redesign but differ in physical interface and signal integrity trade-offs.

Availability

74HCT563D,653 is available at Aetrix Electronics and suitable for microprocessor bus interfacing, industrial PLC I/O expansion, and legacy instrumentation backplane designs requiring stable component supply and long-term lifecycle support.

Supply support for 74HCT563D,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 global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions with focus on reliability, efficiency, and scalability for industrial and automotive markets.

The 74HCT563D,653 belongs to Nexperia's legacy 74HCT logic family, engineered specifically for robust 5 V TTL-compatible digital interfacing in mission-critical industrial control and instrumentation systems.

FAQ

What is the function of the LE and OE pins on the 74HCT563D,653?

The LE (latch enable) pin controls data capture: when HIGH, the 74HCT563D,653 operates transparently (Qn follows Dn); on HIGH-to-LOW transition, it latches the current Dn values. The OE (output enable) pin controls output state: when LOW, Q0–Q7 drive inverted latched data; when HIGH, all outputs enter high-impedance. These functions operate independently-OE does not affect latch contents. This dual-control architecture makes the 74HCT563D,653 ideal for synchronized bus arbitration.

Does the 74HCT563D,653 support 3.3 V operation?

No, the 74HCT563D,653 is specified only for 4.5 V to 5.5 V supply operation and features TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) optimized for 5 V systems. It lacks guaranteed functionality or timing at 3.3 V, and applying 3.3 V to VCC may result in marginal or non-compliant behavior. For 3.3 V applications, consider modern 74LVC or 74ALVC series alternatives-not the 74HCT563D,653.

How does the 74HCT563D,653 differ from the 74HCT573D,653?

The 74HCT563D,653 and 74HCT573D,653 share identical pinout, timing, supply requirements, and control logic (LE/OE), but differ exclusively in output polarity: 74HCT563D,653 provides inverting outputs (Qn = NOT(Dn)), whereas 74HCT573D,653 provides true (non-inverting) outputs. No other electrical or functional differences exist-this polarity distinction is the sole basis for part selection in bus-level signal path design.

What is the maximum capacitive load the 74HCT563D,653 can drive reliably?

The 74HCT563D,653 is characterized for CL = 50 pF in AC specifications and rated as a "bus driver" capable of driving up to 10 standard TTL loads (each ~10 pF + 1.6 mA). At VCC = 4.5 V, its typical output transition time is 5 ns, and propagation delays remain within spec up to 50 pF. Driving >50 pF may increase tTHL/tTLH and skew timing margins-designers should verify signal integrity with actual trace capacitance when using the 74HCT563D,653 in high-fanout layouts.

Is the 74HCT563D,653 RoHS compliant and halogen-free?

Yes, the 74HCT563D,653 manufactured by Nexperia meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SO20 package (suffix "D") uses lead-free matte tin terminations and green molding compound. Compliance documentation-including Declaration of Conformity and material content reports-is available through Nexperia's official product portal for the 74HCT563D,653 under ordering code 74HCT563D,653.