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

Diodes Incorporated PT7C4372AWEX

Name: PT7C4372AWEX
Brand: Diodes Incorporated
SKU: PT7C4372AWEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PT7C4372AWEX

Manufacturer:: Diodes Incorporated

Category:: Real Time Clocks

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

Datasheet:: PT7C4372AWEX.pdf

Description:: IC RTC CLK/CALENDAR I2C 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:3,095

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Product details

Overview

PT7C4372AWEX from Diodes Incorporated is a high-precision I²C real-time clock (RTC) module supporting BCD-coded time/calendar functions (year/month/date/day/hour/minute/second), auto-leap-year calculation through 2099, and dual alarm (Alarm_A/Alarm_B) with interrupt outputs on /INTA and /INTB pins. It operates across 1.3 V to 6 V supply and delivers 0.4 µA typical current at 3.0 V, targeting battery-backed industrial and automotive infotainment systems.

For engineers reviewing the PT7C4372AWEX datasheet, PT7C4372AWEX pinout, PT7C4372AWEX application, or PT7C4372AWEX equivalent, key selection considerations include its ±3.051 ppm clock precision adjustment capability (32.768 kHz crystal), selectable 12-/24-hour mode, five-periodic-interrupt intervals (0.5 s to monthly), and dual open-drain interrupt outputs with configurable routing via SL1/SL2 control bits.

Technical Context

The PT7C4372AWEX integrates a digitally adjustable oscillator circuit with two internal trimming capacitors, enabling precise frequency calibration in ±3.051 ppm steps for 32.768 kHz crystals (±3.125 ppm for 32.000 kHz). Its register-mapped architecture supports independent configuration of Alarm_A (/INTA) and Alarm_B (/INTB), plus oscillation stop detection that flags invalid time data after power loss.

It implements a full BCD timekeeping engine with automatic carry logic across seconds→minutes→hours→days→months→years, including leap-year handling up to 2099. The I²C interface complies with high-speed mode (400 kHz), and both SCL and SDA tolerate up to 6 V beyond V_CC, supporting mixed-voltage system interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
Interface	I²C bus, high-speed mode (400 kHz); SCL/SDA tolerate up to 6 V beyond V_CC
Timekeeping Accuracy	±3.051 ppm adjustment resolution (32.768 kHz crystal); ±189.1 ppm total trim range
Supply Voltage Range	1.3 V to 6.0 V - enables direct connection to coin-cell (1.3–3.6 V) or main rail (3.3/5 V)
Quiescent Current	0.4 µA at 3.0 V - ensures >10-year battery life with CR2032 (220 mAh)
Interrupt Outputs	/INTA and /INTB: open-drain, independently configurable for Alarm_A, Alarm_B, periodic interrupts, or 32-kHz clock output
Calendar Function	BCD-coded year/month/date/day/hour/minute/second; auto-leap-year calculation through year 2099
Crystal Support	External 32.000 kHz or 32.768 kHz crystal; selected via /XSL bit in Time Trimming Register

Pinout & Package

PT7C4372AWEX is housed in an 8-pin TSSOP (L) package with 0.65 mm pitch and exposed pad (RoHS-compliant, lead-free).

Pin/Terminal	Circuit Role	Design Meaning
/INTB	Open-drain interrupt output B	Configurable output for Alarm_B, periodic interrupts, or 32-kHz clock (via register enable)
SCL	I²C serial clock input	Accepts up to 6 V beyond V_CC; synchronizes all I²C read/write transfers
SDA	I²C bidirectional data line	Open-drain output; requires external pull-up; tolerates up to 6 V beyond V_CC
GND	Ground reference	Common return path for all analog/digital circuitry and crystal oscillator
/INTA	Open-drain interrupt output A	Configurable output for Alarm_A, periodic interrupts, or shared Alarm_B (per SL1/SL2 settings)
OSCOUT	Clock oscillator output	Drives external 32 kHz crystal together with OSCIN; forms Pierce oscillator loop
OSCIN	Clock oscillator input	Completes crystal oscillator circuit; internal biasing enables stable startup
V_CC	Power supply input	Supports 1.3–6.0 V; powers RTC core, registers, and I/O buffers

Key Features

Feature	Design Value
Dual independent alarms	Alarm_A routed to /INTA, Alarm_B configurable to /INTA or /INTB; each supports day/hour/minute match with per-day enable
Programmable periodic interrupts	Five intervals (0.5 s, 1 s, 1 min, 1 hr, monthly); selectable pulse or level output for CPU wake-up or polling
Digital clock precision trim	Adjustment in ±3.051 ppm steps (32.768 kHz crystal); compensates aging, temperature drift, and capacitor tolerance
Oscillation stop detection	Hardware flag indicates invalid time data after crystal failure or power loss; prevents use of corrupted calendar
Wide voltage operation	1.3 V minimum V_CC enables direct coin-cell backup; 6 V max supports 5 V system rails without level shifters

Applications

Industrial Control Panel

Automotive Infotainment

Use Scenario: Standalone HMI unit with local time-stamped event logging and scheduled UI refreshes.

IC Role / Device Role / Timing Role: Primary RTC providing BCD time/calendar, periodic wake-up for low-power display updates, and alarm-triggered diagnostics capture.

Use Value: 0.4 µA quiescent current extends battery life; oscillation stop detection prevents timestamp corruption during brown-out events.

Use Scenario: Head unit requiring accurate time display, media scheduling, and firmware update timing validation.

IC Role / Device Role / Timing Role: System-level RTC delivering 24-hour format, dual alarms for reminder notifications, and 32-kHz clock output for audio subsystem sync.

Use Value: ±3.051 ppm trim resolution maintains <±1.5 sec/month accuracy over temperature; wide 1.3–6 V supply eliminates need for dedicated LDO.

Smart Energy Meter

Medical Portable Monitor

Use Scenario: Battery-powered meter logging consumption data with UTC-aligned timestamps for utility billing.

IC Role / Device Role / Timing Role: Tamper-resistant timekeeper with auto-leap-year support and interrupt-driven data upload triggers.

Use Value: Leap-year calculation through 2099 ensures long-term billing accuracy; /INTB 32-kHz output clocks secure crypto co-processor.

Use Scenario: Wearable vital sign recorder with sleep-cycle tracking and medication alerts.

IC Role / Device Role / Timing Role: Low-power RTC generating daily alarms for patient prompts and periodic sensor sampling interrupts.

Use Value: Dual-alarm capability enables separate reminders for dose timing and device calibration; 1.3 V operation supports single-cell Li-ion backup.

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	Integrated TCXO (±2 ppm); higher accuracy but no digital trim; 3.3 V only; no 32-kHz output pin	Requires external temperature compensation circuitry; lacks flexible interrupt routing and dual-alarm independence	Select when absolute accuracy > stability over voltage/temp is critical; avoid if 1.3–6 V supply or /INTB clock output needed
PCF8563	Lower-cost RTC; no clock trim; 0.25 µA current; no leap-year logic; single alarm; 1.8–5.5 V supply	Lacks auto-leap-year, precision adjustment, and dual-interrupt flexibility; limited interrupt interval options	Select for cost-sensitive, short-lifecycle consumer devices where ±2 min/year drift is acceptable

Compared with DS3231M and PCF8563, PT7C4372AWEX uniquely balances ultra-low power (0.4 µA), wide supply range (1.3–6 V), field-adjustable precision (±3.051 ppm), and dual fully independent alarms-making it optimal for long-life, mixed-rail, and function-rich embedded systems.

Availability

PT7C4372AWEX is available at Aetrix Electronics and suitable for industrial control panels, automotive infotainment head units, smart energy meters, and portable medical monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for PT7C4372AWEX 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and timing applications.

The PT7C4372AWEX belongs to Diodes' precision RTC product line, engineered for high-accuracy, low-power, and robust timekeeping in automotive, industrial, and medical systems where reliability across voltage and temperature extremes is essential.

FAQ

What crystal frequencies does the PT7C4372AWEX support?

The PT7C4372AWEX supports external 32.000 kHz and 32.768 kHz crystals. Selection is controlled by the /XSL bit (bit 7) in the Time Trimming Register (address 0x07): /XSL = 0 selects 32.768 kHz, and /XSL = 1 selects 32.000 kHz. Both frequencies are fully supported for timekeeping, alarm, and interrupt functions.

How is the 32-kHz clock output enabled and routed?

The 32-kHz clock output is enabled by clearing the /CLEN bit (bit 3) in Control Register 2 (address 0x0F). It is routed exclusively to the /INTB pin and cannot be redirected to /INTA. This output mirrors the selected crystal frequency (32.768 kHz or 32.000 kHz) and is unaffected by clock precision adjustment settings.

Can Alarm_A and Alarm_B trigger simultaneously on the same pin?

Yes - via SL1/SL2 control bits (bits 4–5 in Control Register 1), both alarms can be routed to /INTA or /INTB. For example, SL2=0/SL1=0 routes Alarm_A and Alarm_B to /INTA while directing 32-kHz output to /INTB. Each alarm retains independent enable/disable control (AALE/BALE bits) and status flag (AAFG/BAFG bits).

Does the PT7C4372AWEX support automatic power-fail detection?

No - it does not include dedicated voltage monitoring or power-fail detection circuitry. However, its Oscillation Stop Detection function identifies invalid time data after power loss or crystal failure by setting a hardware flag. This allows firmware to validate time integrity at boot but does not monitor V_CC level transitions.

PT7C4372AWEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Alarm, Leap Year

Memory Size:: -

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

Date Format:: YY-MM-DD-dd

Interface:: I2C, 2-Wire Serial

Voltage - Supply:: 1.8V ~ 6V

Voltage - Supply, Battery:: -

Current - Timekeeping (Max):: 0.8µA @ 3V

Operating Temperature:: -40°C ~ 85°C (TA)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

PT7C4372AWEX FAQ

1.How can I place an order for PT7C4372AWEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PT7C4372AWEX 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 PT7C4372AWEX reliable?

The price and inventory of PT7C4372AWEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PT7C4372AWEX is usually 5 days.

3.What payment methods are accepted for PT7C4372AWEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PT7C4372AWEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PT7C4372AWEX?

PT7C4372AWEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PT7C4372AWEX 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 PT7C4372AWEX?

For technical support, including PT7C4372AWEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PT7C4372AWEX requirements.

6.How does Aetrix verify that PT7C4372AWEX is sourced from the original manufacturer or authorized distributors?

All PT7C4372AWEX 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 PT7C4372AWEX meets industry standards.

7.What is the process for return or replacement of PT7C4372AWEX?

All PT7C4372AWEX units undergo pre-shipment inspection (PSI). If there is an issue with PT7C4372AWEX, 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 PT7C4372AWEX part is unused and in its original packaging.

Return procedure for PT7C4372AWEX:

1.Submit a request within 90 days.

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

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