NXP Semiconductors 74HC368N,652

Overview

74HC368N,652 from NXP Semiconductors (formerly Philips) is a hex inverting buffer/line driver with 3-state outputs, designed for bus interface and data routing in digital systems. It features 6 independent inverting channels, 3-state output control via active-low OE inputs, propagation delay of 9 ns (typ.) at 5 V, and CMOS-level input compatibility. It is used in address/data bus buffering in microcontroller-based industrial controllers.

For engineers reviewing the 74HC368N,652 datasheet, 74HC368N,652 pinout, 74HC368N,652 application, or 74HC368N,652 equivalent, key selection criteria include 3-state timing (tPZH/tPHZ), inverting logic behavior, VCC range (2–6 V), bus-driver output capability, and compatibility with LSTTL logic families.

Technical Context

The 74HC368N,652 implements six identical inverting buffer stages, each with an independent output enable (OE) input controlling high-impedance state. Its 3-state architecture supports bidirectional bus sharing and avoids contention during read/write cycles.

It operates across VCC = 2.0–6.0 V, meets JEDEC Std. 7A, and is pin-compatible with 74LS368. Input thresholds are CMOS-compatible (VIH ≥ 3.5 V @ VCC = 5 V), and output drive strength supports standard TTL loads (IOH/IOL = ±4 mA @ VCC = 4.5 V).

Key Specifications

Pinout & Package

DIP-16 package: 16-pin dual in-line through-hole, 0.3-inch body width, standard 0.1-inch pin pitch. RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverting 3-state buffer applications.

Compared with 74HC368N,652, the 74HCT368N,652 offers guaranteed TTL input compatibility at the cost of marginally higher static current, while SN74HC368N delivers identical electrical performance with alternate logistics handling-both require no PCB changes but differ in sourcing and qualification documentation.

Availability

74HC368N,652 is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment repair, and test instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for 74HC368N,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

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74HC368N,652 belongs to NXP's legacy HC logic family, engineered for low-power, high-noise-immunity digital interfacing in space-constrained and thermally sensitive embedded systems.

FAQ

What is the maximum operating frequency supported by the 74HC368N,652?

The 74HC368N,652 does not specify a maximum clock frequency, but its typical propagation delay of 9 ns at 5 V implies reliable operation up to approximately 35 MHz in bus-switching applications. Actual usable frequency depends on load capacitance, trace length, and system timing margins. The 74HC368N,652 is intended for asynchronous data routing-not clock distribution-so timing is governed by setup/hold and enable-to-output delays rather than cycle rate.

Does the 74HC368N,652 support 3.3 V operation?

Yes, the 74HC368N,652 supports VCC from 2.0 V to 6.0 V, including 3.3 V nominal operation. At 3.3 V, propagation delay increases to ~15 ns (typ.), and output drive reduces to ±2.6 mA, but it remains fully functional and compatible with 3.3 V CMOS logic families. The 74HC368N,652 requires no level-shifting when interfacing with other 3.3 V devices.

How are the output enable pins configured on the 74HC368N,652?

The 74HC368N,652 has two active-low output enable inputs: 1OE (pin 1) controls outputs 1Y–3Y, and 2OE (pin 15) controls outputs 4Y–6Y. A LOW on either OE enables the corresponding three outputs with inverted logic; a HIGH places them in high-impedance state. This dual-OE structure allows independent control of two logical groups, which is essential for segmented bus architectures. The 74HC368N,652 does not support individual channel enable.

Is the 74HC368N,652 pin-compatible with the 74LS368?

Yes, the 74HC368N,652 is fully pin-compatible with the 74LS368, sharing identical pin configuration, logic function, and DC/AC timing specifications (with appropriate VCC and load conditions). This allows direct replacement in existing LSTTL designs to reduce power consumption and improve noise immunity. The 74HC368N,652 retains the same DIP-16 footprint and functional truth table as the 74LS368.

What is the purpose of the CPD parameter listed for the 74HC368N,652?

The CPD (power dissipation capacitance) of 30 pF per buffer quantifies the internal capacitive load switched during logic transitions. It is used to calculate dynamic power consumption using PD = CPD × VCC² × fi + Σ(CL × VCC² × fo). For the 74HC368N,652, this enables accurate thermal modeling in high-frequency bus applications where switching activity dominates total power draw.