STMicroelectronics M74HC597RM13TR

Overview

M74HC597RM13TR from STMicroelectronics is a high-speed CMOS 8-bit parallel-in/serial-out (PIPO) shift register with integrated storage latch, designed for data serialization in digital control and interface circuits. It features dual edge-triggered clocks (SCK and RCK), asynchronous reset (SCLR), parallel load enable (SLOAD), and operates across 2V–6V supply. Confirmed parameters: f_MAX = 50 MHz (typ. at V_CC = 6V), I_CC ≤ 4 µA (max. at 25°C), t_PLH/t_PHL ≈ 25 ns (at V_CC = 6V), symmetrical output drive (|I_OH| = I_OL = 4 mA min), and TSSOP-16 package.

For engineers reviewing the M74HC597RM13TR datasheet, M74HC597RM13TR pinout, M74HC597RM13TR application, or M74HC597RM13TR equivalent, key selection criteria include its dual-clock latch+shift architecture, 8-bit parallel input timing (setup/hold verified per SI, PI, SLOAD), serial output QH′ propagation delay consistency, and compatibility with legacy 74-series 597 logic functions in space-constrained PCB layouts.

Technical Context

The M74HC597RM13TR implements a two-stage synchronous register: an 8-bit parallel-input storage latch (clocked by RCK) feeding a serial-shift register (clocked by SCK). Both clocks are positive-edge-triggered, enabling precise staging of parallel capture followed by bit-serial extraction. The SLOAD signal (active-low) transfers latched data into the shift register on the next SCK edge.

It includes asynchronous active-low reset (SCLR) that forces all shift register stages low regardless of clock state, and supports direct serial input (SI) alongside parallel loading. Input protection diodes and 28% V_CC noise immunity ensure robust operation in noisy industrial control environments with mixed-signal coupling.

Key Specifications

Pinout & Package

Supplied in a 16-lead TSSOP package (4.9 × 6.4 mm body, 0.65 mm pitch), optimized for automated assembly and thermal performance in dense layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel-in/serial-out shift register applications.

Compared with SN74HC597N and 74LV597PW, the M74HC597RM13TR uniquely combines TSSOP-16 miniaturization, full −55°C to +125°C qualification, and true QH′ (inverted) output-making it optimal for space- and reliability-constrained automotive and industrial modules where pinout fidelity and thermal resilience are non-negotiable.

Availability

M74HC597RM13TR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, LED matrix column driving, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC597RM13TR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The M74HC597 belongs to ST's high-speed HC logic family, engineered for pin-compatible upgrades from legacy TTL while delivering lower power, wider voltage range, and enhanced noise immunity in industrial control and automotive subsystems.

FAQ

What is the function of the SLOAD pin on the M74HC597RM13TR?

The SLOAD pin is an active-low control that transfers the 8-bit data stored in the internal latch (loaded on RCK) into the serial shift register on the next rising edge of SCK. It does not affect the latch itself-only initiates data movement from latch to shift path. This enables precise staging: parallel capture first, then controlled serial release.

Can the M74HC597RM13TR operate reliably at 2.0 V supply?

Yes-the device is fully specified down to 2.0 V, with f_MAX = 4.8 MHz (min), t_PLH ≤ 220 ns, and VIH/VIL thresholds scaled to 28% V_CC. At 2.0 V, VIH = 1.5 V (min) and VOL = 0.1 V (max at 20 µA), ensuring interoperability with other 2 V logic families in ultra-low-power sensor nodes.

How does the QH′ output differ from QH, and why is it inverted?

QH′ is the inverted output of the shift register's most significant bit (MSB), whereas QH would be non-inverted. The inversion supports direct connection to active-low inputs (e.g., reset pins or enable lines) and simplifies daisy-chaining with complementary logic-no external inverter needed. This matches the original 74LS597 behavior for seamless migration.

Is the M74HC597RM13TR RoHS compliant and halogen-free?

Yes-per STMicroelectronics' official product documentation (Doc ID 11262, Rev 7), the M74HC597RM13TR is RoHS-compliant (2011/65/EU) and halogen-free, with lead-free terminations and green molding compound meeting JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) for standard reflow profiles.