STMicroelectronics 74LVX594MTR

Overview

74LVX594MTR from STMicroelectronics is a low-voltage CMOS 8-bit serial-in/parallel-out shift register with output register, featuring 5V-tolerant inputs, 2V–3.6V operation, 5.5ns typical propagation delay at 3.3V, ±4mA symmetrical output drive, and independent shift/storage clocks with asynchronous clears. It enables level-shifting in mixed-voltage 3.3V/5V digital systems such as LED display controllers and industrial I/O expanders.

For engineers reviewing the 74LVX594MTR datasheet, 74LVX594MTR pinout, 74LVX594MTR application, or 74LVX594MTR equivalent, key selection criteria include 5V input tolerance, dual-clock architecture for pipeline staging, low-noise 0.3V dynamic quiet output, 4µA max quiescent current, and SOP-16 package compatibility with legacy 74-series layouts.

Technical Context

The 74LVX594 implements two cascaded synchronous registers: an 8-bit shift register accepting serial data (SI) on positive SCK edges, and an 8-bit D-type storage register loaded on positive RCK edges. Separate SCLR and RCLR inputs allow independent asynchronous reset of each stage.

Its 5V-tolerant inputs accept 0–5.5V regardless of VCC (2–3.6V), enabling safe interfacing between 5V logic and 3.3V systems. Power-down protection ensures no back-drive current when VCC = 0V, and ESD immunity exceeds 2kV per IEC 61000-4-2.

Key Specifications

Pinout & Package

SOP-16 (Small Outline Package, 150 mil width), JEDEC MS-012AC compliant, with 1.27mm pitch and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit shift-with-latch register applications.

Compared with SN74LV8154N and 74HC595PW, the 74LVX594MTR uniquely delivers independent clocking, true 5V input tolerance without external components, and sub-5µA quiescent current - making it optimal for mixed-voltage, low-noise, and power-sensitive embedded control designs.

Availability

74LVX594MTR is available at Aetrix Electronics and suitable for LED display drivers, industrial I/O expanders, mixed-voltage sensor interfaces, and test equipment pattern generators requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74LVX594MTR 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LVX series targets low-voltage, low-power 3.3V logic applications with 5V-tolerant I/O, emphasizing noise immunity, latch-up robustness, and seamless integration into mixed-supply systems.

FAQ

Can 74LVX594MTR operate with VCC = 2.0V and still accept 5V inputs?

Yes. The device guarantees 5V-tolerant inputs across its full operating VCC range (2.0V–3.6V). At VCC = 2.0V, inputs may swing from 0V to 5.5V without damage or functional degradation, and power-down protection prevents reverse current flow when VCC = 0V.

What is the functional difference between SCLR and RCLR?

SCLR asynchronously clears only the 8-bit shift register, leaving the storage register (and thus QA–QH outputs) unchanged. RCLR asynchronously clears only the storage register, preserving shift register contents. This enables independent control of data staging and output release - essential for glitch-free updates.

Does QH' reflect the same data as QH after one clock cycle?

No. QH' is the inverted output of the shift register's final stage (QH), not the storage register's QH. When cascading, QH' feeds SI of the next device. Storage register outputs (QA–QH) update only on RCK edges and are not directly related to QH' timing unless clocks are synchronized.

Is the 74LVX594MTR pin-compatible with standard 74LS594?

Yes - it is pin- and function-compatible with the 74-series 594 family, including 74LS594 and 74HC594, in SOP-16 packaging. However, electrical behavior differs: LVX offers 5V-tolerant inputs, lower VCC, and lower power, so direct substitution requires verifying voltage domain compatibility and timing margins.