Texas Instruments CD74HC365E

Overview

CD74HC365E from Texas Instruments is a high-speed CMOS hex non-inverting three-state buffer with dual active-low output enables (OE1, OE2), 6-channel bidirectional bus driving capability, ±25 mA output sink/source current per pin, 8 ns typical propagation delay at 5 V/15 pF, and operation across –55°C to 125°C for industrial and aerospace signal routing applications.

For engineers reviewing the CD74HC365E datasheet, CD74HC365E pinout, CD74HC365E application, or CD74HC365E equivalent, this page delivers verified functional mode behavior, real-world bus drive capacity (15 LSTTL loads), HC-family voltage flexibility (2–6 V), and precise three-state timing specs critical for legacy TTL interface bridging and high-reliability data path isolation.

Technical Context

The CD74HC365E implements six independent non-inverting buffers, each with high-current CMOS outputs capable of driving up to 15 LSTTL loads. Its dual three-state enable inputs (OE1, OE2) are internally NORed - both must be low to activate all outputs; either high forces all six outputs into high-impedance state.

It operates within the HC logic family, supporting 2 V to 6 V supply range with CMOS input compatibility (II ≤ 1 µA), 30% noise immunity (NIL/NIL = 30% of VCC at 5 V), and balanced tPLH/tPHL transition times - enabling clean signal integrity in mixed-voltage bus systems without level-shifting circuitry.

Key Specifications

Pinout & Package

CD74HC365E is supplied in a 16-pin plastic dual in-line package (PDIP-N), body size 19.30 mm × 6.35 mm, with through-hole mounting and standard 0.3-inch row spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC244N and CD74HC367E, the CD74HC365E uniquely provides dual active-low enables NORed together - offering simpler global bus control with fewer control lines, tighter timing synchronization across all six channels, and direct compatibility with legacy enable architectures designed for 74LS365.

Availability

CD74HC365E is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microprocessor bus isolation, aerospace data acquisition backplanes, and test equipment signal routing matrices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC365E 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability logic ICs and industrial-grade interface components.

The CD74HC365E belongs to TI's CD74HC high-speed CMOS logic family, engineered for robust performance in harsh environments - specifically targeting applications demanding wide temperature operation, low power, and seamless TTL/CMOS interoperability without external level shifters.

FAQ

What is the maximum supply voltage rating for CD74HC365E?

The CD74HC365E has an absolute maximum VCC rating of 7 V, but its recommended operating range is 2 V to 6 V. Operating above 6 V risks exceeding internal oxide breakdown limits and may cause irreversible damage. For reliable long-term use in industrial systems, maintain VCC between 4.5 V and 5.5 V when interfacing with standard TTL loads - the CD74HC365E remains fully functional at 2 V for ultra-low-power portable applications.

Does CD74HC365E support 3.3 V logic systems?

Yes, CD74HC365E fully supports 3.3 V operation: VIH(min) = 2.31 V and VIL(max) = 1.09 V at VCC = 3.3 V (interpolated from datasheet specs), providing >0.7 V noise margin. Its outputs swing rail-to-rail (VOH ≈ 3.3 V, VOL ≈ 0 V), making it suitable for driving other 3.3 V CMOS inputs directly. However, it cannot safely drive 5 V-tolerant inputs without series resistance or clamping due to lack of 5 V input tolerance.

How does the dual OE architecture of CD74HC365E differ from SN74HC244N?

CD74HC365E uses two active-low enables (OE1, OE2) internally NORed - both must be low to enable all six outputs. SN74HC244N has two independent active-low enables (1OE, 2OE), each controlling four outputs separately. This means CD74HC365E offers unified 6-channel control with one logic equation, while SN74HC244N allows granular 4+4 segmentation. The pinout differs: CD74HC365E places OE1/OE2 at pins 1/15; SN74HC244N places them at pins 1/19 (20-pin package).

What is the three-state disable timing for CD74HC365E?

At VCC = 5 V and CL = 15 pF, CD74HC365E exhibits 12 ns typical tPZL (output disable delay from OE high to high-Z) and tPLZ (enable-to-output valid delay) - both specified in Section 5.6 of the datasheet. These values ensure rapid bus release during multi-master arbitration. The max disable time is 38 ns over –55°C to +125°C, guaranteeing deterministic bus turnaround in real-time control loops.

Can CD74HC365E replace obsolete 74LS365 in existing designs?

Yes, CD74HC365E is a direct functional and pin-compatible replacement for 74LS365 in most cases: identical 16-pin PDIP footprint, same pin functions (OE1, OE2, A/Y pairs), and compatible 5 V operation. Key advantages include 90% lower quiescent power (160 µA vs. 30 mA), higher noise immunity (30% vs. 15%), and extended temperature range (–55°C to 125°C vs. 0°C to 70°C). No PCB changes are required - only verify that system timing margins accommodate slightly faster propagation (8 ns vs. 22 ns typical).