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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Real Time Clocks

Analog Devices Inc./Maxim Integrated DS3232MZ+TRL

Name: DS3232MZ+TRL
Brand: Analog Devices Inc./Maxim Integrated
SKU: DS3232MZ+TRL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DS3232MZ+TRL

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Real Time Clocks

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: DS3232MZ+TRL.pdf

Description:: IC RTC CLK/CALENDAR I2C 8SOIC

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Product details

Overview

DS3232MZ+TRL from Maxim Integrated is an ultra-accurate I²C real-time clock (RTC) with integrated MEMS resonator, ±5ppm timekeeping accuracy (±0.432 s/day) across –40°C to +85°C, 236 bytes of battery-backed SRAM, and dual-supply power management (VCC/VBAT). It delivers calendar functions with leap-year compensation through year 2100 and supports industrial metering and embedded systems requiring continuous, high-stability timekeeping during main power loss.

For engineers reviewing the DS3232MZ+TRL datasheet, DS3232MZ+TRL pinout, DS3232MZ+TRL application, or DS3232MZ+TRL equivalent, this page provides verified technical context, validated pin functionality, confirmed alarm and temperature-sensing capabilities, and real-world design implications for backup-power-critical timing systems.

Technical Context

The DS3232MZ+TRL implements a factory-trimmed, temperature-compensated MEMS oscillator that adjusts the 1Hz output once per second when powered by VCC or once every 10s on VBAT to preserve battery life-maintaining ±5ppm accuracy without external crystal or compensation circuitry. Its digital adjustment logic reads an on-die temperature sensor (±3°C accuracy) and applies real-time correction to the time base.

Power control uses a precision voltage reference and comparator to monitor VCC against VPF (2.45–2.70V); automatic switchover to VBAT occurs when VCC drops below VPF, while RST asserts low to signal power failure and supports debounced pushbutton reset (250ms debounce, 250ms active time). The I²C interface operates at up to 400kHz and remains accessible under either VCC or VBAT supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Timekeeping Accuracy	±5ppm (±0.432 s/day) from –40°C to +85°C - enables <1.5s/month drift without calibration in industrial environments.
Backup Supply Current	1.8–3.0 µA (VBAT, I²C inactive) - supports >10-year coin-cell operation in battery-backed applications.
SRAM Capacity	236 bytes battery-backed SRAM - retains critical configuration, logs, or calibration data across power cycles.
I²C Interface Speed	Up to 400kHz Fast Mode - compatible with modern microcontrollers without timing bottlenecks.
Temperature Sensing	Digital sensor with ±3°C accuracy and 10ms conversion time - enables thermal-aware timebase correction and system monitoring.
Alarm Capability	Two independent time-of-day/date alarms with maskable fields (second/minute/hour/day/date) - supports scheduled wake-up, maintenance alerts, or event logging.
Output Signals	1Hz square-wave or interrupt (INT/SQW), 32.768kHz (push-pull, BB32KHZ-enabled), and active-low RST - provides flexible timing, event signaling, and system reset coordination.
Supply Voltage Range	+2.3V to +4.5V (VCC or VBAT) - interoperates with 3.3V and 2.5V logic domains and common lithium backup cells.

Pinout & Package

DS3232MZ+TRL is housed in an 8-pin SOIC package (150 mil width), UL-recognized for reverse-charging protection with lithium batteries. Pin functions are electrically validated per Maxim's official datasheet Rev 2 (July 2013).

Pin/Terminal	Circuit Role	Design Meaning
1 - 32KHZ	32.768kHz output	Push-pull, 50% duty cycle; enabled via EN32KHZ/BB32KHZ bits; usable as system clock source or test point.
2 - VCC	Main power supply input	Primary operating supply (2.3–4.5V); powers I²C interface, RTC, SRAM, and temperature sensor; requires 0.1–1.0µF decoupling.
3 - INT/SQW	Configurable multifunction pin	Open-drain; outputs 1Hz square wave (INTCN=0) or alarm interrupt (INTCN=1, A1IE/A2IE set); requires external pullup ≤4.5V.
4 - RST	Active-low reset & pushbutton input	Open-drain I/O; asserts low on VCC < VPF (power fail) or debounced pushbutton press (250ms); internal 50kΩ pullup to VCC.
5 - GND	Ground reference	Common return path for VCC, VBAT, and all signals; must be low-impedance for stable timekeeping and SRAM retention.
6 - VBAT	Backup power supply input	Accepts 2.3–4.5V backup source; maintains RTC, SRAM, and oscillator during VCC loss; UL-recognized for Li battery use.
7 - SDA	I²C serial data line	Open-drain bidirectional data bus; supports mixed-voltage systems (pullup ≤4.5V regardless of VCC level).
8 - SCL	I²C serial clock line	Input-only clock for I²C; synchronizes data transfers; pullup voltage independent of VCC (≤4.5V).

Key Features

Feature	Design Value
Integrated MEMS resonator	Eliminates external crystal and load capacitors-reduces BOM count, layout area, and aging-related drift in production lines.
Automatic VCC/VBAT switchover	Seamless transition at VPF threshold (2.45–2.70V) with no software intervention-ensures uninterrupted timekeeping during brownouts.
Battery-backed SRAM (236B)	Persists user data across decades of VBAT operation-supports firmware state storage, usage logs, or calibration offsets without EEPROM wear.
Dual alarm with maskable granularity	Enables precise scheduling (e.g., "alarm every Monday at 08:00" or "alarm daily at 23:59:59") without host CPU polling overhead.
On-die temperature sensor	Provides real-time thermal data (±3°C) for environmental monitoring and enables adaptive timebase correction without external components.
Reset with pushbutton debounce	Hardware-debounced RST input eliminates need for external RC filters or firmware debouncing-simplifies system-level reset design.

Applications

Smart Energy Metering	Industrial PLC Timing
Use Scenario: Utility-grade electricity meters requiring tamper-resistant, decade-long timestamping of consumption data under variable grid conditions. IC Role / Device Role / Timing Role: Primary timekeeping engine with battery-backed calendar, leap-year handling, and alarm-triggered data logging. Use Value: ±5ppm accuracy ensures <1.5s/month cumulative error-meets ANSI C12.1 and IEC 62053-21 metrology requirements without field calibration.	Use Scenario: Programmable logic controllers managing cyclic process control tasks where deterministic timing synchronization is critical. IC Role / Device Role / Timing Role: System-wide time anchor for coordinated task scheduling, event stamping, and watchdog timeout generation. Use Value: Dual-supply operation guarantees uninterrupted timekeeping during AC mains dips or controller reboots-enabling reliable sequence-of-events (SOE) recording.
Medical Device Clock Backup	Network Infrastructure Timing
Use Scenario: Portable diagnostic equipment (e.g., ECG monitors) needing accurate timestamps for patient data even during battery swaps or charging interruptions. IC Role / Device Role / Timing Role: Fail-safe RTC with SRAM retention for session metadata, audit trails, and regulatory compliance logging. Use Value: 1.8–3.0 µA VBAT current extends CR2032 life beyond 10 years-meeting FDA 21 CFR Part 11 electronic record integrity expectations.	Use Scenario: Telecom base station controllers and edge routers requiring precise time stamps for packet scheduling, syncE traceability, and NTP stratum alignment. IC Role / Device Role / Timing Role: Local holdover oscillator supporting IEEE 1588 PTP grandmaster fallback during GNSS signal loss. Use Value: MEMS-based stability outperforms quartz alternatives under thermal cycling-reducing time error accumulation during extended GNSS outages.

Smart Energy Metering

Industrial PLC Timing

Use Scenario: Utility-grade electricity meters requiring tamper-resistant, decade-long timestamping of consumption data under variable grid conditions.

IC Role / Device Role / Timing Role: Primary timekeeping engine with battery-backed calendar, leap-year handling, and alarm-triggered data logging.

Use Value: ±5ppm accuracy ensures <1.5s/month cumulative error-meets ANSI C12.1 and IEC 62053-21 metrology requirements without field calibration.

Use Scenario: Programmable logic controllers managing cyclic process control tasks where deterministic timing synchronization is critical.

IC Role / Device Role / Timing Role: System-wide time anchor for coordinated task scheduling, event stamping, and watchdog timeout generation.

Use Value: Dual-supply operation guarantees uninterrupted timekeeping during AC mains dips or controller reboots-enabling reliable sequence-of-events (SOE) recording.

Medical Device Clock Backup

Network Infrastructure Timing

Use Scenario: Portable diagnostic equipment (e.g., ECG monitors) needing accurate timestamps for patient data even during battery swaps or charging interruptions.

IC Role / Device Role / Timing Role: Fail-safe RTC with SRAM retention for session metadata, audit trails, and regulatory compliance logging.

Use Value: 1.8–3.0 µA VBAT current extends CR2032 life beyond 10 years-meeting FDA 21 CFR Part 11 electronic record integrity expectations.

Use Scenario: Telecom base station controllers and edge routers requiring precise time stamps for packet scheduling, syncE traceability, and NTP stratum alignment.

IC Role / Device Role / Timing Role: Local holdover oscillator supporting IEEE 1588 PTP grandmaster fallback during GNSS signal loss.

Use Value: MEMS-based stability outperforms quartz alternatives under thermal cycling-reducing time error accumulation during extended GNSS outages.

Equivalent & Alternatives

The following parts are listed as comparable options for similar real-time clock applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS3231M	Lacks integrated SRAM (0 bytes); identical ±5ppm accuracy, MEMS oscillator, and alarm architecture.	Suitable where timekeeping is primary requirement and external memory suffices-reduces cost and footprint.	Select DS3231M if SRAM is unnecessary and board space is constrained; verify external memory interface compatibility.
RV-3028-C7	±5ppm accuracy over –40°C to +85°C; I²C interface; but uses quartz crystal (not MEMS) and offers only 128B SRAM.	Better suited for applications prioritizing long-term quartz stability over MEMS integration benefits-e.g., legacy designs with existing crystal footprints.	Choose RV-3028-C7 only if quartz-based qualification history is mandatory; note higher component count and potential aging drift vs. DS3232MZ+TRL.

Compared with DS3231M and RV-3028-C7, DS3232MZ+TRL uniquely combines MEMS-based accuracy, 236B SRAM, and UL-recognized VBAT safety-making it optimal for new designs demanding minimal BOM, long-life backup, and regulatory-compliant timekeeping.

Availability

DS3232MZ+TRL is available at Aetrix Electronics and suitable for smart metering, industrial automation, medical diagnostics, and telecom infrastructure requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for DS3232MZ+TRL 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

Maxim Integrated (now part of Analog Devices) is a semiconductor leader specializing in precision analog, mixed-signal, and high-reliability timing solutions for industrial, automotive, and communications markets.

The DS3232MZ+TRL belongs to Maxim's ultra-accurate RTC product line, engineered specifically for applications where crystal-free, battery-backed timekeeping with sub-5ppm stability and integrated memory is essential-targeting metering, PLCs, and mission-critical embedded systems.

FAQ

What is the primary function of the DS3232MZ+TRL in a system?

The DS3232MZ+TRL serves as a highly accurate, battery-backed real-time clock with integrated MEMS resonator and 236 bytes of SRAM. Its core function is to maintain precise time and date information-including leap-year compensation through year 2100-across power interruptions. In systems like energy meters or industrial controllers, DS3232MZ+TRL ensures reliable timestamping, alarm triggering, and data retention without external crystals or calibration. Its dual-supply architecture guarantees continuous operation using VBAT when main power fails.

How does the DS3232MZ+TRL achieve ±5ppm accuracy without an external crystal?

The DS3232MZ+TRL achieves ±5ppm accuracy using an integrated, factory-trimmed MEMS resonator combined with on-die temperature sensing and digital compensation logic. Unlike quartz-based RTCs, it eliminates crystal aging, PCB parasitics, and capacitor matching errors. The device measures temperature every second (on VCC) or every 10 seconds (on VBAT) and dynamically adjusts the 1Hz output frequency. This closed-loop compensation-validated across –40°C to +85°C-ensures DS3232MZ+TRL meets its ±5ppm specification without external components or firmware calibration.

Can the DS3232MZ+TRL operate solely from the VBAT supply?

Yes, the DS3232MZ+TRL can operate solely from VBAT (2.3–4.5V), though with functional limitations: RST output is disabled (held low), temperature conversions occur every 10 seconds instead of every second, and pushbutton reset functionality is unavailable since it requires VCC. Timekeeping, SRAM access, alarms, and I²C communication remain fully operational. This mode draws only 1.8–3.0 µA, enabling multi-year operation from a CR2032 cell-ideal for long-term data loggers or maintenance-free backup clocks where VCC is intermittent.

What are the key differences between the INT/SQW and RST pins on the DS3232MZ+TRL?

INT/SQW is a multifunction open-drain pin configurable as either a 1Hz square-wave output or an alarm-driven interrupt signal (controlled by INTCN bit). It requires an external pullup resistor. RST is an open-drain input/output that asserts low during VCC power failure (below VPF) or on debounced pushbutton press. RST has an internal 50kΩ pullup to VCC and requires no external resistor. Critically, RST operation depends on VCC presence, whereas INT/SQW remains functional under VBAT-only operation-making them complementary for system-level timing and reset coordination in the DS3232MZ+TRL.

Is the 236-byte SRAM in the DS3232MZ+TRL truly battery-backed during VCC loss?

Yes, the 236-byte SRAM in the DS3232MZ+TRL is fully battery-backed and retains data continuously during VCC loss, as long as VBAT remains within 2.3–4.5V. SRAM access (read/write) is supported over I²C whenever either VCC or VBAT is valid. Data retention current is just 100nA when the oscillator is stopped (EOSC=1), and typical timekeeping current on VBAT is 1.8–3.0 µA. This design ensures DS3232MZ+TRL preserves critical firmware state, calibration values, or event logs across years of battery operation-without relying on external nonvolatile memory.

DS3232MZ+TRL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Alarm, Leap Year, Square Wave Output, SRAM

Memory Size:: 236B

Time Format:: HH:MM:SS (12/24 hr)

Date Format:: YY-MM-DD-dd

Interface:: I2C, 2-Wire Serial

Voltage - Supply:: 2.3V ~ 4.5V

Voltage - Supply, Battery:: 2.3V ~ 4.5V

Current - Timekeeping (Max):: 175µA @ 2.3V ~ 4.5V

Operating Temperature:: -40°C ~ 85°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

DS3232MZ+TRL FAQ

1.How can I place an order for DS3232MZ+TRL through Aetrix?

Please submit a Request for Quotation (RFQ) for DS3232MZ+TRL 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 DS3232MZ+TRL reliable?

The price and inventory of DS3232MZ+TRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS3232MZ+TRL is usually 5 days.

3.What payment methods are accepted for DS3232MZ+TRL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS3232MZ+TRL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DS3232MZ+TRL?

DS3232MZ+TRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DS3232MZ+TRL 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 DS3232MZ+TRL?

For technical support, including DS3232MZ+TRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS3232MZ+TRL requirements.

6.How does Aetrix verify that DS3232MZ+TRL is sourced from the original manufacturer or authorized distributors?

All DS3232MZ+TRL 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 DS3232MZ+TRL meets industry standards.

7.What is the process for return or replacement of DS3232MZ+TRL?

All DS3232MZ+TRL units undergo pre-shipment inspection (PSI). If there is an issue with DS3232MZ+TRL, 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 DS3232MZ+TRL part is unused and in its original packaging.

Return procedure for DS3232MZ+TRL:

1.Submit a request within 90 days.

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

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