Texas Instruments SN74HCS367DR

Overview

SN74HCS367 from Texas Instruments is a hex CMOS buffer IC with Schmitt-trigger inputs and 3-state outputs, configured as two independent banks (4-channel + 2-channel), each controlled by its own active-low output enable pin. It operates from 2 V to 6 V, delivers ±7.8 mA output drive at 6 V, supports –40°C to +125°C ambient temperature, and features 100 nA typical supply current - ideal for noise-prone industrial sensor interfacing and controller reset hold applications.

For engineers reviewing the SN74HCS367 datasheet, SN74HCS367 pinout, SN74HCS367 application, or SN74HCS367 equivalent, key selection considerations include Schmitt-trigger hysteresis (min 0.2 V at 2 V), 3-state timing (enable/disable times ≤41 ns at 6 V), bank-level output control, and SOIC-16 package compatibility with legacy board layouts.

Technical Context

The SN74HCS367 implements dual-bank logic buffering where Bank 1 (pins 1OE, 1A1–1A4, 1Y1–1Y4) and Bank 2 (pins 2OE, 2A1–2A2, 2Y1–2Y2) operate independently. Each bank's outputs enter high-impedance state when its respective OE pin is high, enabling bus sharing without contention.

Schmitt-trigger inputs provide hysteresis (ΔVT = 0.2–1.6 V depending on VCC), rejecting slow edges and noise up to ±0.5 V peak-to-peak. Balanced CMOS 3-state outputs support symmetrical sourcing/sinking (±7.8 mA at 6 V) with propagation delay as low as 16 ns at 6 V and 50-pF load.

Key Specifications

Pinout & Package

SN74HCS367 is packaged in a 16-pin SOIC (D package) with 9.90 mm × 3.90 mm body size, compatible with standard surface-mount reflow profiles and legacy PCB footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex buffer with Schmitt-trigger and 3-state applications.

Compared with SN74HCS367, SN74HCS125DR offers reduced channel count but identical performance per channel, while SN74LVTH126PW sacrifices noise immunity for TTL interoperability - making SN74HCS367 the optimal choice for mixed-signal or harsh-environment designs requiring both robust input conditioning and flexible bank control.

Availability

SN74HCS367 is available at Aetrix Electronics and suitable for industrial sensor interface, controller reset hold, switch debouncing, and noise-immune digital bus driver applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74HCS367 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 for industrial, automotive, and communications markets.

The SN74HCS367 belongs to TI's HCS logic family, designed specifically for low-power, high-noise-immunity digital interfacing in demanding environments where reliability and signal integrity are critical.

FAQ

What is the function of the 1OE and 2OE pins on the SN74HCS367?

The 1OE and 2OE pins are active-low output enable inputs controlling two independent banks of buffers. When 1OE is low, all four outputs in Bank 1 (1Y1–1Y4) are enabled; when high, they enter high-impedance state. Similarly, 2OE controls the two outputs in Bank 2 (2Y1–2Y2). This separation allows selective bus gating - for example, disabling peripheral drivers while keeping system clocks active. The SN74HCS367 datasheet specifies that both OE pins should be pulled up to VCC via 10-kΩ resistors to ensure safe high-Z state during power-up.

Does the SN74HCS367 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on the SN74HCS367 must be terminated to either VCC or GND to prevent floating states that cause increased power consumption and unpredictable logic behavior. The SN74HCS367 datasheet recommends 10-kΩ resistors for this purpose, balancing leakage current limits (±100 nA) and transition speed requirements. Leaving inputs unconnected violates the device's recommended operating conditions and may lead to erratic operation, especially in high-noise environments where Schmitt-trigger inputs could oscillate near threshold voltages.

What is the maximum capacitive load the SN74HCS367 can drive while maintaining specified timing?

The SN74HCS367 is characterized for a 50-pF load in its switching characteristics table - propagation delay, enable/disable times, and transition times are guaranteed only up to this value. While the device can physically drive larger capacitances, exceeding 50 pF degrades timing performance: tpd increases beyond 20 ns at 6 V, and signal integrity (ringing, overshoot) worsens. For reliable operation matching the SN74HCS367 datasheet specifications, keep total output node capacitance - including trace, connector, and receiver input - at or below 50 pF. Layout best practices recommend short, direct traces and local decoupling to maintain this limit.

How does the Schmitt-trigger input hysteresis of the SN74HCS367 improve noise immunity?

The SN74HCS367 provides input hysteresis (ΔVT) ranging from 0.2 V at 2 V supply to 0.6 V at 6 V, meaning the positive-going threshold (VT+) and negative-going threshold (VT−) differ by that amount. This creates a "dead zone" preventing multiple toggles when input voltage slowly crosses the logic threshold or experiences noise spikes within the hysteresis window. For instance, at 6 V supply, noise up to ±0.3 V peak-to-peak will not cause false triggering - a critical advantage for SN74HCS367 applications involving mechanical switches, long cables, or unshielded sensor outputs where signal integrity cannot be guaranteed.

Can multiple outputs of the SN74HCS367 be paralleled for higher drive strength?

Yes - the SN74HCS367 datasheet explicitly permits paralleling outputs from the same bank (e.g., 1Y1 and 1Y2) when driven by the same input (1A1 = 1A2) to increase effective sink/source current capability. This technique doubles the available drive strength (e.g., ~15.6 mA at 6 V) without violating absolute maximum ratings, provided both outputs share identical enable status and load conditions. However, outputs from different banks (e.g., 1Y1 and 2Y1) must not be paralleled due to potential timing skew and independent OE control - doing so risks shoot-through current and device damage. Always verify synchronized enable and identical input signals before paralleling any SN74HCS367 outputs.