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

STMicroelectronics M48T512Y-70PM1

Name: M48T512Y-70PM1
Brand: STMicroelectronics
SKU: M48T512Y-70PM1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M48T512Y-70PM1

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

Package:: 32-DIP Module (0.600", 15.24mm)

Datasheet:: M48T512Y-70PM1.pdf

Description:: IC RTC CLOCK/CALENDAR PAR 32DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M48T512Y-70PM1 from STMicroelectronics is a 4 Mbit (512 K × 8) battery-backed TIMEKEEPER® SRAM integrating ultra-low-power static RAM, real-time clock, power-fail control circuitry, lithium coin cell, and 32.768 kHz crystal in a single PMDIP32 module. It operates at 5.0 V (V_CC = 4.5–5.5 V), delivers 70 ns access time, supports BCD-coded timekeeping (year/month/day/hour/minute/second), and guarantees 10-year data retention on battery backup.

For engineers reviewing the M48T512Y-70PM1 datasheet, M48T512Y-70PM1 pinout, M48T512Y-70PM1 application, or M48T512Y-70PM1 equivalent, this device serves as a drop-in replacement for standard 512 K × 8 SRAMs while adding autonomous timekeeping, software-calibratable RTC accuracy (±1/–2 ppm), and automatic power-fail write protection with seamless V_CC-to-battery switchover.

Technical Context

The M48T512Y-70PM1 implements a BiPORT™ dual-port architecture where seven dedicated RAM addresses (7FFF9h–7FFFFh) store BCD-formatted time registers updated once per second by an internal quartz oscillator. The clock control register (7FFF8h) provides independent READ/WRITE bit control, STOP bit (in 7FFF9h), and five-bit calibration field with sign bit for ±31-step adjustment.

Its power management uses voltage-sense circuitry to detect V_CC decay: at VPFD (4.2–4.5 V), it disables writes and places outputs in high-Z; below VSO, it switches to internal lithium battery, sustaining full SRAM and RTC operation. All timing parameters-including tAVQV (70 ns), tELQV (70 ns), and tWHAX (5 ns)-are specified over 0–70 °C with CL = 5 pF.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	4 Mbit (512 K × 8) SRAM array with non-volatile data retention
Access Time	70 ns - enables direct replacement of 70 ns industry-standard SRAMs without timing redesign
Supply Voltage	4.5–5.5 V - compatible with legacy 5 V logic systems and industrial power rails
RTC Accuracy	Better than ±2 ppm after software calibration - achieves ±1.1 seconds/month drift at 25 °C
Data Retention	≥10 years on internal lithium battery - eliminates need for external backup power design
Power-Fail Threshold	VPFD = 4.2–4.5 V - triggers automatic write protection before system brownout corrupts memory
Crystal Frequency	32.768 kHz - standard low-power watch crystal enabling precise timekeeping with minimal current draw

Pinout & Package

Package: 32-pin Plastic Module DIP (PMDIP32), 600 mil width, RoHS-compliant with lead-free second-level interconnect.

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address inputs	19-bit address bus supporting full 524,288-word addressing of SRAM and TIMEKEEPER registers
DQ0–DQ7	Data I/O lines	8-bit bidirectional data path shared between SRAM storage and BCD time register read/write
E	Chip enable	Active-low signal enabling memory access; controls power-down entry when high during V_CC decay
G	Output enable	Active-low signal gating output drivers; must be high during WRITE to prevent bus contention
W	Write enable	Active-low signal initiating WRITE cycles; falling edge synchronizes data latch timing
VCC	Primary supply	5 V nominal input; monitored continuously for VPFD detection and automatic battery switchover
VSS	Ground reference	Common return for SRAM core, RTC oscillator, and voltage-sense circuitry

Key Features

Feature	Design Value
Integrated TIMEKEEPER® RTC	BCD-coded year/month/day/hour/minute/second with automatic leap-year correction through year 2100
Self-contained power solution	On-board lithium coin cell + 32.768 kHz crystal eliminates external backup components and layout complexity
Software-controlled calibration	Five-bit signed calibration register (±31 steps) enables fine-tuning to ±1/–2 ppm accuracy at 25 °C
Automatic power-fail protection	Voltage-sense circuitry disables writes and isolates I/O at VPFD, then switches to battery below VSO
PIN-compatible SRAM replacement	Direct drop-in for standard 512 K × 8 SRAMs-no PCB redesign required for legacy system upgrades

Applications

Industrial PLC Real-Time Logging

Medical Device Timestamping

Use Scenario: Programmable logic controllers record sensor events and operational states with precise timestamps across extended uptime cycles.

IC Role / Device Role / Timing Role: Provides persistent, battery-backed time-of-day stamping synchronized to internal RTC, independent of main system power cycling.

Use Value: Ensures traceable event logs survive 10+ years of intermittent power loss, meeting FDA 21 CFR Part 11 audit requirements for timestamp integrity.

Use Scenario: Portable diagnostic equipment (e.g., ECG monitors) stores patient session metadata including acquisition start/end times.

IC Role / Device Role / Timing Role: Acts as sole time source for session logging; maintains accurate UTC-aligned timestamps during battery-only operation.

Use Value: Delivers ±1.1 sec/month RTC accuracy post-calibration, eliminating need for periodic GPS or network time sync in isolated clinical environments.

Point-of-Sale Transaction Audit

Energy Meter Firmware Clock

Use Scenario: Retail terminals generate fiscal receipts requiring legally binding timestamps for tax compliance and dispute resolution.

IC Role / Device Role / Timing Role: Supplies tamper-resistant, write-protected time values embedded directly into transaction records stored in SRAM.

Use Value: Automatic VPFD-triggered write protection prevents clock or memory corruption during mains brownouts-critical for PCI-DSS audit trails.

Use Scenario: Smart electricity meters maintain billing-cycle timestamps and firmware update logs under variable grid conditions.

IC Role / Device Role / Timing Role: Serves as primary timebase for tariff switching and firmware versioning; retains time across multi-year battery-only operation.

Use Value: 10-year battery-backed retention ensures uninterrupted timekeeping through meter lifetime, satisfying IEC 62053-21 long-term accuracy mandates.

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery-backed RTC SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS12C887-70+ (Maxim Integrated)	5 V, 70 ns, same 512 K × 8 density but uses external crystal; no integrated battery - requires separate holder and Li battery	Lacks self-contained module form factor; demands additional PCB area and assembly steps for backup power	Select if existing designs already use DS12C887 footprint and require vendor diversification without module redesign
M48T35-70PC1 (STMicroelectronics)	Lower density (64 K × 8), same PMDIP28 package; shares identical RTC architecture and calibration method but reduced SRAM capacity	Suitable only for space-constrained systems needing basic timekeeping + minimal non-volatile storage	Choose when board layout cannot accommodate 32-pin DIP or application requires <512 KB backup memory

Compared with DS12C887-70+, M48T512Y-70PM1 reduces bill-of-materials count and layout risk via integrated crystal/battery; versus M48T35-70PC1, it delivers 8× more SRAM while retaining identical calibration workflow and temperature compensation behavior.

Availability

M48T512Y-70PM1 is available at Aetrix Electronics and suitable for industrial PLC logging, medical timestamping, point-of-sale audit, and smart energy metering requiring stable component supply and long-term lifecycle support.

Supply support for M48T512Y-70PM1 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 microcontrollers, analog ICs, MEMS, and power devices for industrial, automotive, and consumer markets.

The TIMEKEEPER® product line targets applications demanding autonomous, long-life timekeeping with non-volatile memory - engineered specifically for mission-critical data logging, regulatory-compliant timestamping, and infrastructure equipment with multi-decade field deployment.

FAQ

What is the battery lifetime specification for M48T512Y-70PM1?

The internal lithium coin cell guarantees ≥10 years of continuous data retention and RTC operation at 25 °C with no external power applied. This rating assumes typical quiescent current draw during battery-backup mode and excludes accelerated aging from elevated ambient temperatures above 70 °C.

How does the M48T512Y-70PM1 handle leap years?

The device automatically corrects for 28-, 29- (leap year compliant through year 2100), 30-, and 31-day months using hardwired logic in the clock chain. No firmware intervention is required-the RTC updates date registers correctly on February 28/29 transitions without user configuration.

Can the crystal oscillator be disabled to extend battery life?

Yes. Setting the STOP bit (D7) in register address 7FFF9h halts the 32.768 kHz oscillator, reducing battery current consumption during shelf storage or standby. The oscillator resumes within ~1 second after clearing the STOP bit to '0'.

Is M48T512Y-70PM1 pin-compatible with standard 512 K × 8 SRAMs?

Yes. Its 32-pin PMDIP32 footprint and signal mapping (A0–A18, DQ0–DQ7, E, G, W, VCC, VSS) match industry-standard 512 K × 8 SRAMs. No PCB modification is needed-only firmware updates may be required to access TIMEKEEPER registers at 7FFF8h–7FFFFh.

M48T512Y-70PM1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Timekeeper®

Package/Case:: 32-DIP Module (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Leap Year

Memory Size:: -

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

Date Format:: YY-MM-DD-dd

Interface:: Parallel

Voltage - Supply:: 4.5V ~ 5.5V

Voltage - Supply, Battery:: -

Current - Timekeeping (Max):: 4mA @ 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: 32-PMDIP Module

M48T512Y-70PM1 FAQ

1.How can I place an order for M48T512Y-70PM1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M48T512Y-70PM1 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 M48T512Y-70PM1 reliable?

The price and inventory of M48T512Y-70PM1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48T512Y-70PM1 is usually 5 days.

3.What payment methods are accepted for M48T512Y-70PM1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48T512Y-70PM1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M48T512Y-70PM1?

M48T512Y-70PM1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M48T512Y-70PM1 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 M48T512Y-70PM1?

For technical support, including M48T512Y-70PM1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48T512Y-70PM1 requirements.

6.How does Aetrix verify that M48T512Y-70PM1 is sourced from the original manufacturer or authorized distributors?

All M48T512Y-70PM1 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 M48T512Y-70PM1 meets industry standards.

7.What is the process for return or replacement of M48T512Y-70PM1?

All M48T512Y-70PM1 units undergo pre-shipment inspection (PSI). If there is an issue with M48T512Y-70PM1, 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 M48T512Y-70PM1 part is unused and in its original packaging.

Return procedure for M48T512Y-70PM1:

1.Submit a request within 90 days.

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

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