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STMicroelectronics M48T201Y-70MH1F
- Part No.:
- M48T201Y-70MH1F
- Manufacturer:
- STMicroelectronics
- Category:
- Real Time Clocks
- Package:
- 44-BSOP (0.337", 8.56mm Width) requires SNAPHAT
- Datasheet:
-
M48T201Y-70MH1F.pdf
- Description:
- IC RTC CLK/CALENDAR PAR 44SOH
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
M48T201Y-70MH1F from STMicroelectronics is a 5.0 V real-time clock (RTC) supervisor IC integrating RTC, watchdog timer, programmable alarm, square wave output, power-fail detection, and battery-backed SRAM control logic. It manages up to 512 K × 8 external low-power SRAM via GCON/ECON signals, provides year-2000-compliant timekeeping with leap-year correction through 2100, and features battery-low flag and microprocessor power-on reset active during backup mode. Used in industrial control panels requiring persistent timestamping and nonvolatile memory supervision.
For engineers reviewing the M48T201Y-70MH1F datasheet, M48T201Y-70MH1F pinout, M48T201Y-70MH1F application, or M48T201Y-70MH1F equivalent, key selection criteria include VPFD voltage range (4.1–4.5 V), SOH44 44-pin SOIC package with SNAPHAT® top compatibility, VOUT regulated output for RAM backup, and TIMEKEEPER® register map access via standard SRAM interface.
Technical Context
The device implements a self-contained RTC subsystem with 16 dedicated TIMEKEEPER® registers mapped into upper SRAM address space (7FFF0h–7FFFFh), accessed identically to conventional SRAM using A0–A18 and DQ0–DQ7. Clock updates occur once per second; alarm and watchdog functions are controlled via register bits (e.g., WDS bit selects reset vs. interrupt output).
Power management includes dual-threshold detection: VPFD (4.1–4.5 V) triggers write protection and RST assertion during VCC decay; VSO switchover enables seamless transition to SNAPHAT® lithium battery (VBAT) for RTC and SRAM retention. GCON/ECON outputs are actively controlled to prevent data corruption during power transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Specifies valid VCC operating range; VPFD threshold (4.1–4.5 V) ensures early write protection before brownout. |
| VPFD Range | 4.1–4.5 V - Power-fail deselect voltage window; determines precise point at which external SRAM and RTC registers become write-protected. |
| Max External RAM | 512 K × 8 - Supported density via A0–A18 addressing; GCON/ECON timing (tAOEL = 20–30 ns) ensures reliable SRAM enable control. |
| RTC Accuracy | ±20 ppm over 0–70°C - Crystal-based timing stability; calibrated via register 7FFF8h; supports long-term timestamp integrity without external compensation. |
| VOUT Output | Regulated ~3.0 V @ 100 µA - Powers attached SRAM during battery backup; <0.3 V drop ensures stable data retention under load. |
| Alarm Output | Programmable month/date/hour/minute/second match - IRQ/FT pin asserts on register match; active in battery backup mode for low-power wake-up. |
| Watchdog Timer | Configurable timeout window - Generates reset or interrupt (via WDS bit); prevents system lockup in embedded controllers during firmware hangs. |
Pinout & Package
Package: SOH44 - 44-pin plastic small outline integrated circuit (330 mil width), RoHS-compliant, lead-free second-level interconnect. Designed for direct top-mounting of separate SNAPHAT® housing (e.g., M4Txx-BR12SH) containing crystal and lithium battery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address inputs | 19-bit address bus for accessing external SRAM (00000h–7FFEFh) and TIMEKEEPER® registers (7FFF0h–7FFFFh). |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus; shares same timing as SRAM reads/writes; no separate RTC data path required. |
| E, G, W | SRAM control inputs | Chip enable (E), output enable (G), write enable (W); standard SRAM interface signals replicated for unified memory mapping. |
| ECON, GCON | RAM control outputs | Active-low chip enable and output enable outputs to external SRAM; dynamically gated during power transitions to prevent corruption. |
| VOUT | Battery-regulated supply | Provides stable ~3.0 V to external SRAM during VCC loss; sourced from SNAPHAT® battery; supports 100 µA load with <0.3 V drop. |
| RST | Open-drain reset output | Asserted low during VCC out-of-tolerance (≤ VPFD); remains active for 200 ms after VCC recovery for safe MCU initialization. |
| IRQ/FT | Open-drain interrupt/frequency test | Alarms or square-wave test signal; active-low; usable for wake-up or clock verification without additional logic. |
| SQW | Square wave output | Programmable frequency (32.768 kHz, 1024 Hz, 64 Hz, 1 Hz) via RS0–RS3 bits in register 7FFF0h; no external oscillator needed. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RTC + Supervisor | Single-chip solution replaces discrete RTC, reset IC, watchdog, and battery management; reduces BOM count and PCB area. |
| SNAPHAT® Top-Mount Design | SOIC socket accepts battery/crystal module post-reflow; eliminates thermal damage risk to lithium cell during SMT assembly. |
| Year-2000 Compliant Calendar | Automatic leap-year correction through year 2100; month-end adjustment for 28/29/30/31-day months handled in hardware. |
| Backup-Mode Alarm | IRQ/FT remains functional during battery-only operation; enables low-power wake-up of host processor without VCC dependency. |
| SRAM Transparency | TIMEKEEPER® registers occupy fixed upper SRAM addresses; no special I²C/SPI interface required - uses existing parallel bus. |
Applications
| Industrial HMI Panels | Medical Data Loggers |
|---|---|
|
Use Scenario: Human-machine interface panel in factory automation requires persistent event timestamps, configuration storage, and power-loss recovery. IC Role / Device Role / Timing Role: RTC supervisor provides accurate wall-clock time, battery-backed SRAM stores last-known state and logs, and RST ensures clean boot after brownout. Use Value: Eliminates need for external backup capacitor or supercapacitor; VOUT sustains SRAM at 100 µA for >10 years with SNAPHAT® 120 mAh battery. |
Use Scenario: Portable ECG monitor records patient vitals continuously and must retain timestamps across battery swaps and charging cycles. IC Role / Device Role / Timing Role: M48T201Y-70MH1F maintains synchronized time and stores calibration data in external SRAM while main system sleeps. Use Value: Alarm output wakes MCU only when new log entry is due; SQW 1 Hz output drives low-power real-time scheduler without CPU overhead. |
| Energy Metering Gateways | Building Automation Controllers |
|
Use Scenario: Smart electricity meter gateway aggregates consumption data hourly and uploads daily; must retain time and counters during grid outages. IC Role / Device Role / Timing Role: Supervises 512 KB SRAM storing 30 days of interval data; VPFD-triggered write protection prevents corruption during voltage sags. Use Value: Battery-low flag (bit in register 7FFF0h) alerts firmware to initiate graceful shutdown before RTC failure; field-replaceable SNAPHAT® extends service life. |
Use Scenario: HVAC controller logs temperature setpoints, occupancy events, and maintenance intervals across seasonal power interruptions. IC Role / Device Role / Timing Role: Provides century-aware calendar, programmable alarms for scheduled maintenance, and watchdog reset on firmware hang. Use Value: GCON/ECON timing guarantees SRAM write integrity during 100 ms power dips; RST pulse duration (200 ms max) matches typical MCU reset requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RTC supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS12887A+ (Maxim) | Legacy 5 V RTC with integrated lithium battery; no external SRAM control outputs (ECON/GCON); fixed 128 bytes NV SRAM. | Lacks dynamic SRAM supervision; unsuitable for systems requiring >128 B nonvolatile storage or external memory write protection. | Select only if board space is constrained and external SRAM supervision is unnecessary. |
| PCF8583 (NXP) | I²C interface; no parallel SRAM control; 24-byte internal RAM; requires external crystal and pull-ups; lower accuracy (±100 ppm). | Not pin-compatible; demands firmware I²C stack; cannot replace M48T201Y-70MH1F in existing parallel-memory designs without hardware redesign. | Choose only for new low-pin-count designs where I²C is preferred and SRAM supervision is not required. |
Compared with DS12887A+ and PCF8583, M48T201Y-70MH1F uniquely combines parallel SRAM supervision, programmable alarm/wdog, and SNAPHAT® modularity - enabling field-serviceable battery replacement and scalable memory retention without redesign.
Availability
M48T201Y-70MH1F is available at Aetrix Electronics and suitable for industrial HMI panels, medical data loggers, energy metering gateways, and building automation controllers requiring stable component supply with long-lifecycle support.
Supply support for M48T201Y-70MH1F 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, specializing in microcontrollers, power management, sensors, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
M48T201Y-70MH1F belongs to the TIMEKEEPER® supervisor product line, engineered to integrate real-time clock, power monitoring, and nonvolatile memory control into single-package solutions for embedded systems demanding high reliability and long-term data integrity.
FAQ
What is the function of the VOUT pin?
VOUT delivers a regulated ~3.0 V output sourced from the SNAPHAT® battery during VCC loss, powering external SRAM to maintain data retention. It supplies up to 100 µA with less than 0.3 V drop, ensuring stable operation of low-power SRAM during extended backup periods - critical for preserving logs and configuration across power outages.
How does the M48T201Y-70MH1F handle leap years?
The device automatically adjusts date calculations for leap years through year 2100 using built-in calendar logic. It correctly handles February 29 in leap years and switches to March 1 the next day, with no firmware intervention required. This behavior is hardwired in the RTC circuitry and verified per ISO 8601 compliance in the datasheet.
Can the SQW output frequency be changed dynamically?
Yes - the square wave output frequency (32.768 kHz, 1024 Hz, 64 Hz, or 1 Hz) is selected by writing values to bits RS0–RS3 in register 7FFF0h. This register is accessible via standard SRAM read/write cycles at address 7FFF0h, allowing runtime reconfiguration without reset or external components.
Is the SNAPHAT® housing included with the M48T201Y-70MH1F?
No - the SNAPHAT® housing (e.g., M4T28-BR12SH or M4T120-BR12SH) is ordered separately and mounted onto the SOH44 package post-reflow. The SOIC contains only the IC die, bond wires, and leads; the battery and 32.768 kHz crystal reside exclusively in the detachable SNAPHAT® module for thermal safety and field replacement.
M48T201Y-70MH1F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Timekeeper®
- Package/Case:
- 44-BSOP (0.337", 8.56mm Width) requires SNAPHAT
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Clock/Calendar
- Features:
- Alarm, Leap Year, Square Wave Output, Supervisor, Watchdog Timer, Y2K
- 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:
- 3V
- Current - Timekeeping (Max):
- 3mA @ 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 44-SOH
M48T201Y-70MH1F FAQ
1.How can I place an order for M48T201Y-70MH1F through Aetrix?
Please submit a Request for Quotation (RFQ) for M48T201Y-70MH1F 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 M48T201Y-70MH1F reliable?
The price and inventory of M48T201Y-70MH1F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48T201Y-70MH1F is usually 5 days.
3.What payment methods are accepted for M48T201Y-70MH1F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48T201Y-70MH1F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M48T201Y-70MH1F?
M48T201Y-70MH1F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M48T201Y-70MH1F 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 M48T201Y-70MH1F?
For technical support, including M48T201Y-70MH1F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48T201Y-70MH1F requirements.
6.How does Aetrix verify that M48T201Y-70MH1F is sourced from the original manufacturer or authorized distributors?
All M48T201Y-70MH1F 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 M48T201Y-70MH1F meets industry standards.
7.What is the process for return or replacement of M48T201Y-70MH1F?
All M48T201Y-70MH1F units undergo pre-shipment inspection (PSI). If there is an issue with M48T201Y-70MH1F, 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 M48T201Y-70MH1F part is unused and in its original packaging.
Return procedure for M48T201Y-70MH1F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M48T201Y-70MH1F Tags
-
MCP7940N-I/SN
Microchip Technology
-
MCP7940MT-I/MNY
Microchip Technology
-
PCF85063ATL/1,118
NXP USA Inc.
-
MCP7940NT-I/SN
Microchip Technology
-
MCP7940NT-I/MS
Microchip Technology
-
MCP7940N-I/MS
Microchip Technology
-
PCF85063AT/AY
NXP USA Inc.
-
PCF85063TP/1Z
NXP USA Inc.
-
PCF85063ATT/AJ
NXP USA Inc.
-
MCP7940NT-E/SN
Microchip Technology
-
MCP7940NT-I/MNY
Microchip Technology
-
MCP79400T-I/SN
Microchip Technology
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