STMicroelectronics M74HC4017RM13TR

Overview

M74HC4017RM13TR from STMicroelectronics is a high-speed CMOS decade counter/divider with 10 decoded outputs, 5-stage Johnson architecture, and active-low clock enable (CKEN) and carry (COUT) functions. It operates from 2V to 6V, delivers tPD = 21 ns (typ.) at VCC = 6V, supports 10 MHz max clock frequency, and features symmetrical output drive (±4 mA). Used in sequential LED drivers, timing sequencers, and digital state machines.

For engineers reviewing the M74HC4017RM13TR datasheet, M74HC4017RM13TR pinout, M74HC4017RM13TR application, or M74HC4017RM13TR equivalent, key selection criteria include decoded output count (10), clock edge sensitivity (rising), clear polarity (active-high), carry logic (active-low), and TSSOP-16 package compatibility with space-constrained PCB layouts.

Technical Context

The M74HC4017RM13TR implements a 5-bit Johnson counter with decoded Q0–Q9 outputs, where each output asserts high for exactly one clock cycle in a 10-cycle sequence. Its carry output toggles low-to-high after Q9 deasserts, enabling cascaded multi-decade counting when paired with CKEN.

It uses silicon gate C2MOS technology for low ICC (4 µA max at 25°C) and high noise immunity (VNIH/VNIL = 28% VCC min). Input thresholds are rail-proportional (VIH = 3.15 V @ VCC = 4.5 V), and propagation delays are balanced (tPLH ≅ tPHL) across all outputs and control pins.

Key Specifications

Pinout & Package

TSSOP-16 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free, RoHS-compliant surface-mount outline optimized for automated assembly and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC4017E and SN74HC4017DR, the M74HC4017RM13TR offers the highest fMAX (29 MHz) and smallest footprint (TSSOP-16), making it optimal for high-density, high-speed digital sequencers where board area and timing margin are constrained.

Availability

M74HC4017RM13TR is available at Aetrix Electronics and suitable for LED lighting controllers, industrial timer modules, test equipment sequencers, and embedded indexer systems requiring stable component supply across long production lifecycles.

Supply support for M74HC4017RM13TR 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 automotive, industrial, and consumer markets.

The M74HC4017 belongs to ST's high-speed CMOS logic family, engineered for low-power, rail-to-rail compatible digital sequencing in space- and energy-constrained embedded control systems.

FAQ

What is the function of the COUT pin on the M74HC4017RM13TR?

The COUT (Carry Output) pin is active-low and transitions from high to low after Q9 returns to low, marking completion of the 10-count cycle. It is designed to drive the CKEN (Clock Enable) input of a cascaded M74HC4017, enabling synchronous multi-digit counting without external logic. Its timing aligns precisely with the internal Johnson counter state, ensuring zero-cycle ambiguity between stages.

Can the M74HC4017RM13TR operate reliably at 2.0 V supply voltage?

Yes - the device is fully specified down to VCC = 2.0 V, with guaranteed fMAX = 5 MHz, tPD ≤ 295 ns, and VIH = 1.5 V (min). At this voltage, output drive strength reduces to ±20 µA, making it suitable for ultra-low-power monitoring circuits but not for driving heavy capacitive or resistive loads. All DC and AC parameters remain valid across the full −55°C to +125°C temperature range.

How does the CLOCK ENABLE (CKEN) input affect counter operation?

CKEN is an active-low enable input: when pulled high, counting halts immediately and holds the current decoded output state; when pulled low, counting resumes on the next rising clock edge. Unlike gated clocks, CKEN does not introduce glitches or metastability because it controls internal enable latches synchronously. This allows safe pausing/resuming of sequences without resetting internal state or requiring external synchronization logic.

Is the M74HC4017RM13TR pin-compatible with older 74LS4017 devices?

No - while functionally equivalent and logically pin-compatible (same pin numbers for Q0–Q9, CLOCK, CLEAR, COUT, CKEN, VCC, GND), the M74HC4017RM13TR uses CMOS input thresholds and drive strength, whereas 74LS4017 is TTL. Direct replacement requires verifying VIL/VIH compatibility (e.g., LS outputs may not meet HC VIH at VCC = 2 V) and adjusting pull-up/pull-down networks to avoid bus contention or excessive loading on shared lines.