STMicroelectronics M74HC4040TTR

Overview

M74HC4040TTR from STMicroelectronics is a high-speed CMOS 12-stage binary ripple counter with TSSOP-16 package, operating from 2V to 6V supply, delivering f_MAX = 70 MHz (typ.) at V_CC = 6V, I_CC ≤ 4 µA (max) at 25°C, and symmetrical output drive of ±4 mA. It serves as a frequency divider (1/4096) in clock tree distribution and timing control circuits for industrial PLCs and sensor interface modules.

For engineers reviewing the M74HC4040TTR datasheet, M74HC4040TTR pinout, M74HC4040TTR application, or M74HC4040TTR equivalent, key selection criteria include propagation delay matching (t_PLH/t_PHL ≤ 13 ns at 6V), CLEAR-to-Q_n delay ≤ 36 ns, noise immunity (V_NIH/V_NIL ≥ 28% V_CC), and TSSOP-16 thermal profile suitability for space-constrained PCB layouts.

Technical Context

The M74HC4040TTR implements a synchronous-reset-free asynchronous ripple counter using silicon gate C2MOS technology, where each stage feeds the clock input of the next, producing Q1–Q12 outputs with cumulative division ratios (2ⁿ). Its edge-triggered CLOCK input responds only to LOW-to-HIGH transitions, while the active-high CLEAR asynchronously forces all outputs low.

All inputs include ESD protection diodes rated for ±20 mA transient current; output stages are designed for balanced sourcing/sinking capability (|I_OH| = I_OL ≥ 4 mA at V_CC = 4.5V), and propagation delays remain tightly matched (t_PLH ≅ t_PHL) across temperature (−55°C to +125°C).

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9–5.1 mm width, 6.2–6.6 mm length, 1.2 mm height, 0.65 mm pitch, exposed pad not present, RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-stage binary counter applications.

Compared with SN74HC4040PWR and 74AC4040SCX, the M74HC4040TTR offers superior thermal robustness (−55°C to +125°C), lowest quiescent current, and highest noise immunity - making it optimal for mission-critical timing in harsh environments where long-term reliability outweighs marginal speed gains.

Availability

M74HC4040TTR is available at Aetrix Electronics and suitable for industrial PLC timing modules, serial interface baud rate generators, power supply sequencing controllers, and LED dimming waveform generators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for M74HC4040TTR 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 microcontrollers, power ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The M74HC4040 belongs to ST's high-speed CMOS logic family, engineered specifically for low-power, high-noise-immunity digital timing functions in industrial automation and embedded control systems where reliability across extreme temperatures is non-negotiable.

FAQ

Can M74HC4040TTR operate reliably at 2.0 V supply?

Yes. The device is fully specified down to V_CC = 2.0 V, with f_MAX = 4.8 MHz (min), t_PLH/t_PHL ≤ 75 ns, and V_IL ≤ 0.5 V - enabling use in energy-harvesting systems powered by thin-film batteries or piezoelectric sources.

Is the CLEAR input synchronous or asynchronous?

The CLEAR input is asynchronous and active-high: asserting CLEAR immediately forces all Q1–Q12 outputs low, independent of CLOCK state or edge. Minimum high pulse width is 16 ns at V_CC = 6 V, verified per AC electrical characteristics table on page 5.

What is the maximum capacitive load supported on Q outputs?

Each Q output drives up to 10 LS-TTL loads (≈15 pF total), as confirmed by I_OL/I_OH = ±4 mA specifications at V_CC = 4.5 V. Exceeding this load increases propagation delay variance and may cause setup/hold violations in downstream logic.

Does M74HC4040TTR include Schmitt-trigger inputs?

No. The CLOCK and CLEAR inputs are standard CMOS with no hysteresis; V_NIH and V_NIL are specified as 28% V_CC (min), meaning input thresholds track supply voltage linearly - external RC filtering or Schmitt buffers are required for slow-rising or noisy clock sources.