Texas Instruments SN74HCS367PWR

Overview

SN74HCS367 from Texas Instruments is a hex buffer and line driver 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 typical supply current of 100 nA - used for noise-immune signal conditioning in industrial control interfaces and microcontroller peripheral isolation.

For engineers reviewing the SN74HCS367 datasheet, SN74HCS367 pinout, SN74HCS367 application, or SN74HCS367 equivalent, key selection criteria include Schmitt-trigger hysteresis (ΔVT = 0.6–1.6 V), 3-state timing (enable/disable times ≤ 41 ns at 6 V), bank-level output control, and TSSOP-16 package compatibility with high-density PCB layouts.

Technical Context

The SN74HCS367 implements six independent CMOS buffers with dual-bank architecture: Bank 1 (pins 1OE, 1A1–1A4, 1Y1–1Y4) contains four channels; Bank 2 (pins 2OE, 2A1–2A2, 2Y1–2Y2) contains two channels. Each bank's outputs enter high-impedance state when its respective OE pin is high.

Schmitt-trigger inputs provide hysteresis (ΔVT ≥ 0.6 V at 6 V), enabling reliable operation with slow-rising signals (e.g., mechanical switch inputs) and rejecting noise up to ±0.8 V peak-to-peak. Output drive strength is balanced (±7.8 mA at 6 V), supporting light-load transmission-line driving without external termination.

Key Specifications

Pinout & Package

TSSOP-16 package (5.00 mm × 4.40 mm body size), lead-free, RoHS-compliant, moisture sensitivity level (MSL) 1 - suitable for standard reflow assembly without baking.

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 SN74HCS125PWR and 74LVC1G17GW, the SN74HCS367 uniquely provides six channels with dual independent output enables and guaranteed Schmitt hysteresis across 2–6 V - making it the only option for scalable, bank-isolated buffering in space-constrained industrial and automotive PCBs.

Availability

SN74HCS367 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and IoT edge node signal conditioning 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The SN74HCS367 belongs to TI's HCS logic family - designed specifically for low-power, high-noise-immunity digital interfacing in harsh environments where reliability and wide supply voltage tolerance are critical.

FAQ

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

The SN74HCS367 is characterized for CL = 50 pF in switching specifications. While larger loads may be driven, propagation delay and transition time increase nonlinearly beyond this value - for example, tt rises from 10 ns (6 V, 50 pF) to >20 ns at 100 pF. To maintain timing compliance per datasheet, keep total output capacitance ≤50 pF using short traces and minimal stubs. The SN74HCS367 datasheet explicitly states this condition applies to all switching characteristics including fmax and tpd.

How should unused inputs on the SN74HCS367 be terminated?

Unused inputs on the SN74HCS367 must be tied to a valid logic level - either VCC or GND - to prevent floating states that cause excessive current draw and erratic output behavior. A 10 kΩ pull-up or pull-down resistor is recommended, matching the leakage-current-limited design guidance in Section 9.2.1.2. Direct connection is acceptable if the controlling signal source is permanently inactive. Leaving inputs unconnected violates TI's layout guidelines and risks increased ICC and thermal stress.

Does the SN74HCS367 support true 5 V TTL input compatibility?

No, the SN74HCS367 does not guarantee 5 V TTL input compatibility. Its input thresholds scale with VCC: VT+ = 2.1 V min and VT− = 1.2 V min at 6 V supply, but at 5 V supply, VT+ = 1.7 V min and VT− = 0.9 V min. Standard TTL outputs (VOH ≈ 2.4 V, VOL ≈ 0.4 V) may not reliably cross these thresholds across temperature and process variation. For guaranteed TTL interfacing, use a dedicated TTL-compatible buffer such as the SN74HCT367.

Can the two output banks of the SN74HCS367 be used simultaneously with different enable signals?

Yes, the SN74HCS367 is explicitly designed for independent bank control: 1OE governs Bank 1 (1Y1–1Y4), and 2OE governs Bank 2 (2Y1–2Y2). This allows concurrent operation - e.g., holding sensor data lines active (1OE = low) while disabling actuator control lines (2OE = high) during MCU reset. The function table in Section 8.4 confirms Z-state is asserted per bank, with no inter-bank dependency.

What is the recommended bypass capacitor configuration for the SN74HCS367?

Texas Instruments recommends a 0.1 µF ceramic capacitor placed physically adjacent to the VCC pin (Pin 16) and GND pin (Pin 8), with short, low-inductance traces. Layout Figure 11-1 shows this placement. For enhanced high-frequency noise suppression, a parallel 1 µF capacitor may be added - but the 0.1 µF unit is mandatory and must be the closest to the device. Failure to implement proper bypassing increases susceptibility to supply-induced jitter and output instability, especially under fast switching conditions.