STMicroelectronics HCF4020M013TR

Overview

HCF4020M013TR from STMicroelectronics is a 14-stage ripple-carry binary counter IC with buffered inputs/outputs, Schmitt-trigger clock input, and common asynchronous reset. It operates up to 16 MHz (typ.) at VDD = 10 V, supports supply voltages from 3 V to 20 V, and delivers symmetrical output drive (±1.1 mA at VDD = 5 V). It is used in frequency division, timing control, and digital event counting circuits in industrial timers and instrumentation.

For engineers reviewing the HCF4020M013TR datasheet, HCF4020M013TR pinout, HCF4020M013TR application, or HCF4020M013TR equivalent, key selection criteria include propagation delay (65–130 ns Qn→Qn+1 at VDD = 15 V), reset pulse width tolerance (30 ns min at 15 V), input leakage (≤100 nA at VDD = 18 V), and SO-16 package compatibility with automated SMT assembly.

Technical Context

The HCF4020M013TR implements a cascaded chain of 14 master-slave D-type flip-flops, advancing state on each falling edge of the Φ input. Its Schmitt-trigger input enables robust clocking with unlimited rise/fall times, eliminating external conditioning circuitry.

All outputs (Q1, Q4–Q14) are fully buffered for fan-out stability and noise immunity; the common RESET line forces all outputs low asynchronously, independent of clock phase. Quiescent current is specified from -55°C to +125°C, supporting extended-temperature industrial operation.

Key Specifications

Pinout & Package

Package: SO-16 (Small Outline, 16-pin, surface-mount, 1.27 mm pitch, JEDEC MS-012 variant per PO13H mechanical drawing).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4020BE and 74HC4020PW, HCF4020M013TR uniquely balances wide supply range (3–20 V), Schmitt-trigger noise immunity, and SO-16 SMT compatibility - making it optimal for ruggedized industrial timing where voltage flexibility and EMI resilience are mandatory.

Availability

HCF4020M013TR is available at Aetrix Electronics and suitable for industrial timer modules, digital event counters, power supply sequencing controllers, and legacy system clock generators requiring stable component supply across extended temperature and voltage ranges.

Supply support for HCF4020M013TR 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.

HCF4020M013TR belongs to the HCF4000B series of high-voltage CMOS logic devices, engineered specifically for robust timing, counting, and control functions in harsh industrial environments with wide supply and temperature requirements.

FAQ

What is the minimum reset pulse width required for reliable operation at 15 V supply?

The minimum reset pulse width is 30 ns at VDD = 15 V, as specified in the Dynamic Electrical Characteristics table. This narrow requirement enables integration with fast digital control logic such as FPGA outputs or microcontroller GPIOs without added pulse-stretching circuitry. The parameter is validated across the full -55°C to +125°C operating temperature range.

Does HCF4020M013TR support true static operation, and how is that verified?

Yes, it supports fully static operation: the counter holds any stable state indefinitely without clock activity, confirmed by the "FULLY STATIC OPERATION" headline in the datasheet's feature list and absence of minimum clock frequency specification. Internal master-slave flip-flop architecture inherently prevents race conditions or metastability during clock suspension.

Can Q1–Q3 outputs be accessed on the HCF4020M013TR package?

No - only Q1 and Q4 through Q14 are brought out to pins (pins 1, 2, 3, 4, 5, 6, 12, 13, 14, 15). Q2 and Q3 are internal nodes not available externally, as shown in the Functional Diagram and Pin Description table. This matches the standard HCF4020B pinout and cannot be modified via configuration.

How does the Schmitt-trigger input improve noise immunity compared to standard CMOS inputs?

The Schmitt-trigger input provides hysteresis (typically 1–2.5 V depending on VDD), meaning the rising and falling input thresholds differ by ~1 V. This prevents multiple transitions due to slow-rising or noisy clock edges - a critical advantage when deriving Φ from RC oscillators, mechanical switch debouncing, or long cable runs. Standard CMOS inputs lack this hysteresis and may oscillate under identical conditions.