STMicroelectronics M74HC164TTR

Overview

M74HC164TTR from STMicroelectronics is a high-speed CMOS 8-bit serial-in, parallel-out (SIPO) shift register with dual data inputs (A/B), asynchronous master clear, and edge-triggered clock. It operates from 2V to 6V, delivers 62MHz max clock frequency at 6V, supports ±4mA symmetrical output drive, and features 4µA max quiescent current at 25°C - used in LED matrix drivers, address latching, and digital control sequencing.

For engineers reviewing the M74HC164TTR datasheet, M74HC164TTR pinout, M74HC164TTR application, or M74HC164TTR equivalent, this page provides verified functional identity, TSSOP-14 package mapping, SIPO timing behavior, noise immunity specs (28% VCC), and real-world interface constraints for embedded logic expansion and serial-to-parallel conversion.

Technical Context

The M74HC164TTR implements an 8-stage shift register using silicon gate C2MOS technology, where each rising clock edge shifts data right and loads QA with the NAND of A and B inputs. Its asynchronous CLEAR input forces all Q outputs low regardless of clock or data state.

Input protection circuits guard against ESD and transient overvoltage; propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 4mA). The device is functionally and pin-compatible with standard 74-series 164 logic.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9–5.1 mm width, 6.2–6.6 mm length, 0.65 mm pitch, 1.2 mm max height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SIPO shift register applications.

Compared with SN74HC164DR and 74LV164PW, the M74HC164TTR offers optimal balance of 5V compatibility, TSSOP space savings, and proven noise immunity - making it preferred for industrial control boards where layout density and EMI resilience are co-prioritized.

Availability

M74HC164TTR is available at Aetrix Electronics and suitable for LED display drivers, microcontroller GPIO expansion, and industrial address latching requiring stable component supply across automotive-grade temperature ranges (−55°C to +125°C).

Supply support for M74HC164TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

The M74HC164TTR belongs to ST's legacy HC logic family - engineered for pin- and function-compatibility with industry-standard 74-series devices while delivering enhanced speed, power efficiency, and ruggedness for embedded control systems.

FAQ

Can M74HC164TTR operate reliably at 3.3V?

Yes - the device is fully specified from 2V to 6V, with guaranteed performance at 3.3V including 32ns typical propagation delay, 4mA output drive, and 28% VCC noise margin. Input thresholds scale with VCC, ensuring clean logic interpretation without external biasing.

What happens if both A and B inputs are held low?

When A = B = LOW, QA loads HIGH on each rising clock edge (since QA = A·B = LOW·LOW = HIGH in NAND logic). This produces a repeating "1" pattern shifted right - useful for initializing or test-mode sequences.

Is the CLEAR input truly asynchronous?

Yes - the CLEAR signal forces all Q outputs low immediately, independent of clock phase or data inputs. Propagation delay from CLEAR to any Q is 17ns (typ.) at 6V, and the function overrides all internal state, including metastable conditions.

Does M74HC164TTR support hot insertion?

No - the device lacks hot-swap protection circuitry. Applying VCC before GND or connecting inputs while unpowered may exceed absolute maximum ratings (e.g., VI > VCC + 0.5V), risking latch-up or permanent damage.