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Home > Products > Integrated Circuits (ICs) > Logic > Counters, Dividers

STMicroelectronics M74HC4020B1R

Name: M74HC4020B1R
Brand: STMicroelectronics
SKU: M74HC4020B1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HC4020B1R

Manufacturer:: STMicroelectronics

Category:: Counters, Dividers

Package:: 16-DIP (0.300", 7.62mm)

Datasheet:: M74HC4020B1R.pdf

Description:: IC BINARY COUNTER 14-BIT 16DIP

Quantity:: RFQ Add To RFQ list

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Inventory:2,046

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Product details

Overview

M74HC4020B1R from STMicroelectronics is a high-speed CMOS 14-stage binary counter with pin- and function-compatibility to the 74-series 4020. It operates from 2V to 6V, delivers symmetrical output drive (±4 mA), achieves 70 MHz max clock frequency at 6V, and features edge-triggered clock input and asynchronous active-high clear. It is used in timing division circuits requiring precise 1/16384 clock scaling, such as real-time clock prescalers and serial data rate generators.

For engineers reviewing the M74HC4020B1R datasheet, M74HC4020B1R pinout, M74HC4020B1R application, or M74HC4020B1R equivalent, key selection criteria include propagation delay matching across stages (tPLH ≅ tPHL), low quiescent current (4 µA max), wide VCC range (2–6 V), noise immunity (28% VCC min), and DIP-16 package compatibility with legacy 74HC designs.

Technical Context

The M74HC4020B1R implements a synchronous 14-bit ripple-carry binary counter using silicon gate C2MOS technology. Its clock input triggers on the LOW-to-HIGH transition, and the active-high CLEAR asynchronously resets all 14 flip-flops to logic low.

Twelve outputs (Q1, Q4–Q14) provide divided clock signals - Q1 = f_IN/2, Q4 = f_IN/16, up to Q14 = f_IN/16384. All inputs include ESD protection diodes, and output impedance is balanced (|I_OH| = I_OL ≥ 4 mA) for consistent rise/fall times.

Key Specifications

Parameter	Value and Actual Design Meaning
Max Clock Frequency	70 MHz (typ.) at VCC = 6 V - enables high-speed timing division without external PLL
Supply Voltage Range	2 V to 6 V - supports dual-supply systems and battery-powered logic interfacing
Quiescent Current	4 µA (max) at TA = 25°C - minimizes standby power in always-on timing modules
Output Drive Strength	±4 mA (min) - ensures reliable fan-out to ≥2 standard HC loads under worst-case VCC/temp
Noise Immunity	VNIH/VNIL = 28% VCC (min) - rejects supply-coupled transients in noisy industrial environments
Propagation Delay (Q1)	18 ns (max) at VCC = 6 V - guarantees predictable setup/hold margins in cascaded counters
Operating Temperature	−55°C to +125°C - qualified for automotive under-hood and industrial control applications

Pinout & Package

Package: Plastic DIP-16 (0.300 inch width), JEDEC MS-001, body dimensions 20.0 × 8.5 mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 9, 12, 13, 14, 15	Q1, Q4–Q14 Outputs	Asynchronous divided clock outputs; Q1 = /2, Q14 = /16384; no internal buffering
10	CLOCK Input	Edge-triggered (LOW→HIGH); minimum pulse width 7 ns at 6 V - defines maximum input jitter tolerance
11	CLEAR Input	Asynchronous active-high reset; propagates to all stages within 15 ns (6 V) - enables immediate state zeroing
8	GND	Logic ground reference; decoupling capacitor must be placed adjacent to this pin
16	VCC	Positive supply; requires local 100 nF ceramic bypass between pins 8 and 16

Key Features

Feature	Design Value
Symmetrical Output Impedance	Ensures matched rise/fall times (tTLH ≈ tTHL), critical for duty-cycle preservation in clock trees
Balanced Propagation Delays	tPLH ≅ tPHL across all stages - eliminates skew-induced metastability in multi-stage dividers
Wide Supply Range	2–6 V operation allows direct interface with 3.3 V microcontrollers and 5 V legacy peripherals
ESD-Protected Inputs	Integrated diode clamps withstand ±20 mA transient current - reduces need for external TVS in board-level ESD design
Pin-Compatible Replacement	DIP-16 footprint matches obsolete 74HC4020 and 74LS4020 - enables drop-in upgrade without PCB rework

Applications

Real-Time Clock Prescaler

Serial Data Rate Generator

Use Scenario: Dividing a 32.768 kHz crystal oscillator to generate 1 Hz, 2 Hz, and 4 Hz timebase signals.

IC Role / Device Role / Timing Role: Primary 14-stage divider; Q14 provides exact 2 Hz output (32768 ÷ 16384), Q13 yields 1 Hz.

Use Value: Eliminates software timer overhead and ensures deterministic, jitter-free seconds pulses for RTC firmware.

Use Scenario: Generating baud-rate clocks (e.g., 9600, 19200, 38400) from a 1.8432 MHz master oscillator.

IC Role / Device Role / Timing Role: Hardware clock divider feeding UART clock input; Q4 = 115.2 kHz, Q6 = 28.8 kHz, Q8 = 7.2 kHz.

Use Value: Offloads timing generation from MCU, enabling lower-power sleep modes while maintaining precise serial timing.

Frequency Synthesis Reference Divider

Industrial PLC Scan Timer

Use Scenario: Providing programmable reference division ratios to a PLL-based synthesizer in RF test equipment.

IC Role / Device Role / Timing Role: Fixed-ratio pre-divider; selected taps (Q8–Q12) feed phase detector to set channel spacing (e.g., 12.5 kHz, 25 kHz).

Use Value: Reduces PLL loop bandwidth requirements and improves lock time versus full-N synthesis alone.

Use Scenario: Implementing fixed-interval scan cycles (e.g., 10 ms, 20 ms, 50 ms) for deterministic I/O polling in ruggedized PLCs.

IC Role / Device Role / Timing Role: Deterministic cycle timer; Q5 = 32× base clock, Q6 = 64× - generates stable, temperature-invariant scan windows.

Use Value: Guarantees repeatable scan timing independent of CPU load or interrupt latency variations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-stage binary counter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC4020N	Same logic function and DIP-16 package; max f_MAX = 60 MHz (typ.) at 6 V; higher ICC (8 µA max)	Limited to ≤60 MHz clocking; less suitable for high-frequency prescaling above 30 MHz	Prefer when cost sensitivity outweighs speed requirement and TI sourcing is preferred
CD74HC4020E	Identical AC/DC specs and pinout; rated for −55°C to +125°C same as M74HC4020B1R; slightly higher t_PHL (16 ns vs. 15 ns at 6 V)	No functional impact in most timing applications; identical thermal qualification	Select when requiring dual-sourcing assurance with identical performance envelope

Compared with SN74HC4020N and CD74HC4020E, the M74HC4020B1R offers the highest verified clock frequency (70 MHz typ.), lowest quiescent current (4 µA), and tightest propagation delay matching - making it optimal for precision, low-power, high-speed division where stage-to-stage skew must be minimized.

Availability

M74HC4020B1R is available at Aetrix Electronics and suitable for real-time clock prescalers, serial data rate generators, frequency synthesis reference dividers, and industrial PLC scan timers requiring stable component supply across extended temperature ranges.

Supply support for M74HC4020B1R 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.

The M74HC4020B1R belongs to ST's high-speed CMOS logic family, engineered for low-power, high-noise-immunity digital timing applications in harsh environments and legacy-compatible systems.

FAQ

Is M74HC4020B1R compatible with 5 V TTL logic inputs?

Yes - its VIH(min) is 3.15 V at VCC = 4.5 V and 4.2 V at VCC = 6 V, exceeding TTL's 2.0 V high-level threshold. Input protection diodes clamp voltages beyond VCC or GND, allowing safe interfacing with 5 V TTL outputs without external level shifters.

What is the maximum fan-out capability of M74HC4020B1R outputs?

Each output drives ≥2 standard 74HC loads (C_L = 50 pF) while maintaining specified t_PLH/t_PHL and VOH/VOL. At VCC = 6 V and IO = ±4 mA, it sustains valid logic levels driving two parallel HC gates or one LS gate, verified per AC electrical characteristics table.

Does M74HC4020B1R require an external pull-up on the CLEAR pin?

No - CLEAR is active-high and internally uncommitted; it may be driven directly by a microcontroller GPIO or open-collector buffer. Pull-up is only needed if driven by an open-drain source; typical use connects CLEAR to VCC via switch or logic signal without external bias.

Can M74HC4020B1R operate reliably at 2.0 V supply?

Yes - it is fully specified down to 2.0 V, with VIH(min) = 1.5 V, VOL(max) = 0.1 V, and f_MAX = 4.8 MHz (min). Propagation delays increase predictably (t_PLH = 65 ns max), supporting low-voltage battery-powered timing where speed is secondary to energy efficiency.

M74HC4020B1R Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74HC

Package/Case:: 16-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Binary Counter

Direction:: Up

Number of Elements:: 1

Number of Bits per Element:: 14

Reset:: Asynchronous

Timing:: -

Count Rate:: 70 MHz

Trigger Type:: Negative Edge

Voltage - Supply:: 2 V ~ 6 V

Operating Temperature:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 16-DIP

M74HC4020B1R FAQ

1.How can I place an order for M74HC4020B1R through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HC4020B1R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M74HC4020B1R reliable?

The price and inventory of M74HC4020B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC4020B1R is usually 5 days.

3.What payment methods are accepted for M74HC4020B1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC4020B1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HC4020B1R?

M74HC4020B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HC4020B1R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M74HC4020B1R?

For technical support, including M74HC4020B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC4020B1R requirements.

6.How does Aetrix verify that M74HC4020B1R is sourced from the original manufacturer or authorized distributors?

All M74HC4020B1R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M74HC4020B1R meets industry standards.

7.What is the process for return or replacement of M74HC4020B1R?

All M74HC4020B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC4020B1R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M74HC4020B1R part is unused and in its original packaging.

Return procedure for M74HC4020B1R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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