STMicroelectronics M74HC393RM13TR

Overview

M74HC393RM13TR from STMicroelectronics is a high-speed CMOS dual 4-bit binary ripple counter with independent negative-edge-triggered clock inputs and asynchronous clear. It operates from 2V to 6V, delivers 79 MHz max clock frequency at 6V, and features symmetrical 4 mA output drive capability. Used in digital timing, frequency division, and address sequencing circuits where cascaded divide-by-256 operation is required.

For engineers reviewing the M74HC393RM13TR datasheet, M74HC393RM13TR pinout, M74HC393RM13TR application, or M74HC393RM13TR equivalent, key selection criteria include negative-edge clocking, independent clear per counter, TSSOP-14 package compatibility, and guaranteed 4 mA output drive across full voltage and temperature range.

Technical Context

The M74HC393RM13TR integrates two electrically isolated 4-bit ripple-carry binary counters, each triggered on the falling edge of its dedicated clock input (CLK1, CLK2). Each counter has its own active-low asynchronous clear (CLR1, CLR2), enabling independent reset without affecting the other section.

It uses silicon gate C2MOS technology for low static current (4 µA max at 25°C) and high noise immunity (28% VCC min). Propagation delays are balanced (tPLH ≅ tPHL), and outputs support symmetrical sourcing/sinking (|IOH| = IOL = 4 mA min), ensuring predictable timing in synchronous logic chains.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, thin shrink small outline, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual binary counter applications.

Compared with SN74HC393DR and CD74HC393M96, the M74HC393RM13TR offers superior thermal performance in dense layouts due to TSSOP-14's lower θJA, while maintaining full functional equivalence and ST's AEC-Q100-aligned manufacturing controls for automotive-adjacent designs.

Availability

M74HC393RM13TR is available at Aetrix Electronics and suitable for frequency division, digital timing control, address decoding, and industrial sequence logic requiring stable component supply across automotive, industrial automation, and test equipment programs.

Supply support for M74HC393RM13TR 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, specializing in automotive, industrial, and power management ICs with broad analog, digital, and mixed-signal portfolios.

The M74HC393RM13TR belongs to ST's high-speed HC logic family, designed specifically for robust, low-power digital signal routing and timing functions in harsh-environment embedded systems.

FAQ

What is the maximum clock frequency supported by M74HC393RM13TR at 3.3 V?

At VCC = 3.3 V, the maximum clock frequency is 34 MHz (min) over the −40°C to +85°C range, per AC Electrical Characteristics table on page 6 of the official ST datasheet. This value is derived from measured propagation delay and pulse width limits under CL = 50 pF loading conditions.

Can the two counters be synchronized to the same clock edge?

Yes - both CLK1 (pin 1) and CLK2 (pin 13) accept the same external clock signal. Since both are negative-edge-triggered, they increment simultaneously on each falling edge, enabling parallel counting with matched phase alignment.

Is the M74HC393RM13TR pin-compatible with older 74LS393 devices?

No - while functionally equivalent and logic-compatible, M74HC393RM13TR uses CMOS input thresholds and drive strength, whereas 74LS393 is TTL. Direct replacement requires verifying voltage level compatibility, especially for driving LS inputs or being driven by LS outputs.

Does the device support cascading beyond 8 bits?

Yes - the QD output of Counter 1 (pin 6) can drive CLK2 (pin 13) to create an 8-bit ripple counter. Further extension to 12+ bits is possible by connecting QD of Counter 2 (pin 8) to a third counter's clock, provided setup/hold and propagation delay budgets are verified per stage.