Texas Instruments CD74HC365M

Overview

CD74HC365M from Texas Instruments is a high-speed CMOS hex non-inverting three-state buffer with dual active-low output enables (OE1, OE2), 2–6 V supply operation, 8 ns typical propagation delay at 5 V/15 pF, and ±25 mA output drive capability. It serves as a bus driver in digital interface circuits requiring level translation, load isolation, and controlled data routing in industrial control and instrumentation systems.

For engineers reviewing the CD74HC365M datasheet, CD74HC365M pinout, CD74HC365M application, or CD74HC365M equivalent, key selection considerations include its SOIC-16 package, HC logic family voltage flexibility (2–6 V), three-state bus-driving capability, -55°C to +125°C operating range, and compatibility with LSTTL loads while delivering CMOS power efficiency.

Technical Context

The CD74HC365M implements six independent non-inverting buffers, each with high-current push-pull outputs capable of driving up to 15 LSTTL loads. Its dual three-state enable inputs (OE1 and OE2) are internally NORed, allowing simultaneous control of all six outputs with active-low logic.

It operates across a wide supply range (2 V to 6 V) with balanced tPLH/tPHL propagation delays and transition times, enabling reliable timing in mixed-voltage systems. Input noise immunity is specified at 30% of VCC for both NIL and NIH, ensuring robust operation in electrically noisy environments.

Key Specifications

Pinout & Package

CD74HC365M is housed in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm, with standard 1.27 mm pitch and RoHS-compliant NiPdAu lead finish. It is rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).

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 CD74HC365M96, the CD74HC365M offers exact 6-channel matching with dual-NOR enable architecture ideal for compact 6-bit control buses, while CD74HC365M96 provides identical performance in optimized packaging for SMT production.

Availability

CD74HC365M is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller peripheral expansion, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for CD74HC365M 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 ICs, with decades of expertise in high-reliability logic families and industrial-grade qualification.

The CD74HC365M belongs to TI's CD74HC high-speed CMOS logic series, designed for robust, low-power digital interfacing in extended-temperature industrial, instrumentation, and aerospace applications.

FAQ

What is the supply voltage range supported by the CD74HC365M?

The CD74HC365M operates from 2 V to 6 V DC, making it compatible with 3.3 V and 5 V logic systems without external level shifting. This wide range allows direct integration into mixed-voltage designs and simplifies power architecture in industrial controllers where multiple rail voltages coexist. The CD74HC365M maintains specified timing and drive performance across the full range.

How does the dual output enable (OE1 and OE2) function in the CD74HC365M?

In the CD74HC365M, OE1 and OE2 are internally NORed, meaning all six outputs enter high-impedance state only when both enables are high (logic 1). If either OE1 or OE2 is low, outputs remain active. This architecture allows flexible control - for example, using one enable for system-wide bus release and the other for local subsystem gating. The CD74HC365M datasheet confirms this behavior in Table 7-1.

Is the CD74HC365M pin-compatible with the CD74HCT365M?

No, the CD74HC365M is not pin-compatible with the CD74HCT365M in terms of input logic thresholds: while both share identical pinout and package (SOIC-16), the HCT version requires 4.5–5.5 V supply and accepts LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), whereas the HC version operates from 2–6 V with CMOS thresholds (VIL = 1.8 V at 6 V). Swapping them may cause logic misreads or failure to drive downstream TTL loads reliably. The CD74HC365M must be used only in HC-family designs.

What is the maximum capacitive load the CD74HC365M can drive while maintaining specified timing?

The CD74HC365M is characterized for CL = 15 pF (tPLH/tPHL = 8 ns typical at 5 V) and CL = 50 pF (tPLH/tPHL = 22 ns max at 5 V). Its ±25 mA output drive supports stable operation into ≥50 pF loads, including PCB trace capacitance, connector parasitics, and input capacitance of multiple downstream devices. For loads exceeding 50 pF, propagation delay increases predictably per the 5.6 Switching Characteristics table in the CD74HC365M datasheet.

Does the CD74HC365M require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on the CD74HC365M (e.g., spare A or OE pins) must be terminated to a valid logic level (VCC or GND) to prevent floating states that cause increased supply current, erratic output behavior, or ESD vulnerability. TI's Layout Guidelines (Section 9.1) explicitly mandate this. Leaving inputs unconnected violates the CD74HC365M's recommended operating conditions and risks undefined operation, especially over temperature.