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STMicroelectronics M48T58Y-70MH1F
- Part No.:
- M48T58Y-70MH1F
- Manufacturer:
- STMicroelectronics
- Category:
- Real Time Clocks
- Package:
- 28-SOIC (0.337", 8.56mm Width) with SNAPHAT Sockets
- Datasheet:
-
M48T58Y-70MH1F.pdf
- Description:
- IC RTC CLK/CALENDAR PAR 28SOH
- Quantity:
- Payment:
- Shipping:
Inventory:1,799
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Product details
Overview
M48T58Y-70MH1F from STMicroelectronics is a 64 Kbit (8 Kb × 8) non-volatile TIMEKEEPER® SRAM integrating ultra-low-power static RAM, real-time clock (RTC), power-fail control circuitry, and on-board lithium battery + 32.768 kHz crystal in a CAPHAT™ DIP-28 package. It delivers BCD-coded timekeeping (year/month/day/hour/minute/second), automatic leap-year correction, frequency test output (FT), and VPFD-triggered write protection at 4.2–4.5 V. Used in industrial control panels for persistent timestamping during mains failure.
For engineers reviewing the M48T58Y-70MH1F datasheet, M48T58Y-70MH1F pinout, M48T58Y-70MH1F application, or M48T58Y-70MH1F equivalent, this device serves as a JEDEC-standard 8 Kb × 8 SRAM drop-in replacement with integrated RTC functionality - requiring no external battery management, crystal load capacitors, or clock initialization firmware.
Technical Context
The M48T58Y-70MH1F integrates a BiPORT™ SRAM array (8184 × 8) and a quartz-controlled 32.768 kHz oscillator on a single die, with clock registers mapped to addresses 1FF8h–1FFFh. Time data is stored in 24-hour BCD format and updated once per second by dedicated clock control logic - independent of SRAM read/write cycles.
Its power-fail detection operates across two thresholds: VPFD (4.2–4.5 V) triggers automatic write protection and high-Z I/O, while VSO (≈4.0 V) switches supply from VCC to internal battery. The device maintains RTC operation and SRAM data retention for ≥7 years on the integrated 48 mAh lithium cell under continuous backup conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64 Kbit (8 Kb × 8); provides byte-wide parallel access identical to JEDEC-standard SRAMs. |
| RTC resolution | 1 second; BCD-coded year/month/day/hour/minute/second with automatic 28/29/30/31-day month correction. |
| VPFD range | 4.2 V to 4.5 V; initiates automatic write protect and chip deselect before VCC collapse compromises data integrity. |
| Access time | 70 ns; meets timing requirements for legacy 8-bit microcontroller buses (e.g., 8051, Z80) without wait states. |
| Battery life | ≥7 years in data retention mode; enabled by ultra-low RTC current (1.0 µA typical) and integrated lithium cell. |
| Crystal accuracy | ±35 ppm at 25°C; ensures ±1.1 sec/day drift, sufficient for industrial logging without periodic NTP sync. |
| Package | PCDIP28 CAPHAT™; self-contained 28-pin plastic DIP housing silicon, 32.768 kHz crystal, and 48 mAh lithium battery. |
Pinout & Package
PCDIP28 CAPHAT™ package: 28-pin, 600-mil dual in-line package with integrated lithium battery and quartz crystal - no external components required for RTC or backup operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A12 | Address inputs | 13-bit address bus for accessing 8,192 bytes (0000h–1FFFh); A12 selects upper clock register block (1FF8h–1FFFh). |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus; supports BYTEWIDE™ SRAM-like read/write plus RTC register access via same interface. |
| E1, E2 | Chip enable inputs | Active-low (E1) and active-high (E2) dual CE scheme enables JEDEC-compliant timing; E1 low + E2 high = active mode. |
| G | Output enable | Controls three-state output drivers; high during WRITE to prevent bus contention, low during READ to drive DQ lines. |
| W | Write enable | Active-low signal initiating WRITE cycle; falling edge (with E1 low/E2 high) latches data into SRAM or clock registers. |
| FT | Frequency test output | Open-drain 32.768 kHz square wave output; used for production calibration and system-level clock verification. |
| VCC | Supply voltage | 4.5–5.5 V nominal; VPFD monitoring begins at 4.2 V to ensure deterministic write protect before brownout corruption. |
| VSS | Ground | System reference for all logic and RTC circuits; decoupling capacitor required near pin to suppress VCC noise-induced false VPFD trips. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RTC + SRAM + battery + crystal | Eliminates 4 external components (RTC IC, backup cap/battery, crystal, load caps), reducing BOM count and PCB area by >30%. |
| Byte-wide clock register mapping | RTC values reside at fixed SRAM addresses (1FF8h–1FFFh), enabling standard memory read/write instructions - no custom I²C/SPI driver needed. |
| Automatic leap-year correction | Hardware handles February 29 in leap years through year 2100; removes software date math complexity and Y2K/Y2100 edge-case risk. |
| STOP bit control | MSB of seconds register halts oscillator to extend battery shelf life; factory-shipped with STOP=1 to preserve battery pre-deployment. |
| Century bit with enable | CEB/CB bits allow explicit century tracking (19xx/20xx) and rollover handling - critical for long-life industrial loggers beyond 2099. |
Applications
| Industrial PLC Data Logger | Medical Device Event Recorder |
|---|---|
|
Use Scenario: Captures timestamped sensor readings and fault events during mains power loss in programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile SRAM stores operational logs; integrated RTC provides accurate wall-clock timestamps without host CPU intervention. Use Value: Maintains synchronized time and data integrity for ≥7 years on internal battery - eliminating need for external supercapacitor or service calls. |
Use Scenario: Records critical therapy delivery events (e.g., infusion pump actuations) with legally traceable timestamps in Class II medical equipment. IC Role / Device Role / Timing Role: Acts as tamper-resistant time source and event buffer; BCD RTC registers meet FDA 21 CFR Part 11 audit-trail requirements. Use Value: Hardware-based leap-year and century handling ensures timestamp validity across decades - avoiding software patch risks in certified devices. |
| Energy Meter Firmware Storage | Building Automation Controller |
|
Use Scenario: Stores tariff schedules, calibration constants, and billing cycle counters in smart electricity meters deployed for >15-year field life. IC Role / Device Role / Timing Role: Provides secure, battery-backed storage for meter configuration data and real-time energy accumulation counters. Use Value: VPFD-triggered write protection prevents corruption during grid voltage sags - ensuring regulatory compliance with IEC 62053-21. |
Use Scenario: Manages HVAC scheduling, occupancy logs, and alarm history in commercial building controllers operating unattended for years. IC Role / Device Role / Timing Role: Serves as central timekeeper and event buffer; FT pin enables periodic calibration against master building clock. Use Value: Integrated crystal eliminates external timing component drift - maintaining ±1.1 sec/day accuracy without network time sync dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-volatile RTC+SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS12887A-120IND+ | 5V-only (4.5–5.5 V), 200-year RTC calendar, no STOP bit; uses external lithium battery (not integrated). | Requires separate battery holder, crystal, and load caps; larger footprint due to discrete components. | Select if legacy DS12887 socket compatibility is mandatory and board space allows external components. |
| M48T35Y-70MH1F | 32 Kbit (4 Kb × 8) variant; identical RTC, VPFD (4.2–4.5 V), and CAPHAT™ packaging - reduced memory depth only. | Same pinout and timing; suitable where <8 KB non-volatile storage suffices (e.g., simpler controllers). | Choose for cost-sensitive designs needing identical RTC reliability but lower memory capacity. |
Compared with DS12887A-120IND+, M48T58Y-70MH1F reduces bill-of-materials and layout complexity via integrated battery/crystal; versus M48T35Y-70MH1F, it doubles SRAM capacity for extended event buffering without changing footprint or firmware.
Availability
M48T58Y-70MH1F is available at Aetrix Electronics and suitable for industrial PLC data loggers, medical event recorders, smart energy meters, and building automation controllers requiring stable component supply across multi-year production cycles.
Supply support for M48T58Y-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 specializing in automotive, industrial, and power management ICs, with broad analog, MCU, and memory portfolios.
The M48T58Y belongs to ST's TIMEKEEPER® family - designed specifically for systems demanding long-term, maintenance-free timekeeping and non-volatile data storage in harsh or remote environments.
FAQ
What is the function of the FT pin?
The FT (Frequency Test) pin provides an open-drain 32.768 kHz square wave output directly from the RTC oscillator. It is used during manufacturing calibration and system-level validation to verify crystal accuracy and oscillator stability without accessing internal registers. No pull-up resistor is required for basic monitoring, though one may be added for logic-level compatibility.
How does the M48T58Y-70MH1F handle leap years?
The device performs automatic leap-year correction in hardware for years 1900–2100, including February 29 in divisible-by-4 years (except 1900). This logic resides in the clock control circuit and requires no firmware intervention. The century bit (CB) and century enable bit (CEB) allow explicit 20th/21st-century tracking, supporting correct rollover at year 2000 and 2100.
Can the internal battery be replaced?
No - the lithium button cell is permanently sealed within the CAPHAT™ PCDIP28 package and not user-replaceable. ST specifies ≥7 years of data retention under continuous backup conditions at 25°C. For applications exceeding this lifetime, system-level redesign or use of external battery-backed alternatives is required.
Is the M48T58Y-70MH1F RoHS compliant?
Yes - the device is RoHS compliant and features lead-free second-level interconnects. The CAPHAT™ package uses Pb-free solder terminations and complies with EU Directive 2011/65/EU. Full material declarations and exemption documentation are available in ST's official product change notices (PCNs) and environmental reports.
M48T58Y-70MH1F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Timekeeper®
- Package/Case:
- 28-SOIC (0.337", 8.56mm Width) with SNAPHAT Sockets
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 3mA @ 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 28-SOH
M48T58Y-70MH1F FAQ
1.How can I place an order for M48T58Y-70MH1F through Aetrix?
Please submit a Request for Quotation (RFQ) for M48T58Y-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 M48T58Y-70MH1F reliable?
The price and inventory of M48T58Y-70MH1F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48T58Y-70MH1F is usually 5 days.
3.What payment methods are accepted for M48T58Y-70MH1F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48T58Y-70MH1F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M48T58Y-70MH1F?
M48T58Y-70MH1F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M48T58Y-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 M48T58Y-70MH1F?
For technical support, including M48T58Y-70MH1F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48T58Y-70MH1F requirements.
6.How does Aetrix verify that M48T58Y-70MH1F is sourced from the original manufacturer or authorized distributors?
All M48T58Y-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 M48T58Y-70MH1F meets industry standards.
7.What is the process for return or replacement of M48T58Y-70MH1F?
All M48T58Y-70MH1F units undergo pre-shipment inspection (PSI). If there is an issue with M48T58Y-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 M48T58Y-70MH1F part is unused and in its original packaging.
Return procedure for M48T58Y-70MH1F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M48T58Y-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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