Overview
The M48T35Y-70MH1F is a 32 Kb x 8 non-volatile static RAM and real-time clock integrated circuit produced by STMicroelectronics. This monolithic chip is part of the TIMEKEEPER® series and is designed to provide a highly integrated battery-backed memory and real-time clock solution. It is pin and function compatible with JEDEC standard 32 Kb x 8 SRAMs, making it a versatile component for various applications. The device is available in two special packages: the 28-pin DIP CAPHAT™ package, which includes a quartz crystal and a long-life lithium button cell, and the 28-pin SOIC package, which allows for a separate SNAPHAT® housing containing the battery and crystal to be mounted after the surface mount process.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Memory Size | 32 Kb x 8 | 256 Kbit |
| Supply Voltage (VCC) | 4.5 to 5.5 V | |
| Power-Fail Deselect Voltage (VPFD) | 4.2 to 4.5 V | |
| Operating Temperature | –40 to 85 °C | |
| Package Types | 28-pin DIP CAPHAT™, 28-pin SOIC with SNAPHAT® housing | |
| Real-Time Clock Features | BCD coded year, month, day, date, hours, minutes, and seconds; automatic corrections for leap years and month lengths | |
| Data Retention | At least 7 years with internal battery backup | |
| Write Protection | Automatic power-fail deselect and WRITE protection |
Key Features
- Integrated ultra-low power SRAM, real-time clock, power-fail control circuit, and battery.
- BYTEWIDE™ RAM-like clock access.
- BCD coded year, month, day, date, hours, minutes, and seconds with automatic leap year and month length corrections.
- Frequency test output for real-time clock.
- Automatic power-fail chip deselect and WRITE protection.
- Self-contained battery and crystal in the CAPHAT™ DIP package or separate SNAPHAT® housing for SOIC package.
- Pin and function compatible with JEDEC standard 32 Kb x 8 SRAMs.
- RoHS compliant – Lead-free second level interconnect.
Applications
The M48T35Y-70MH1F is suitable for a wide range of applications requiring non-volatile memory and real-time clock functionality. These include:
- Industrial control systems.
- Medical devices.
- Aerospace and defense systems.
- Automotive systems.
- Data logging and monitoring systems.
- Any system requiring reliable, battery-backed memory and real-time clock capabilities.
Q & A
- What is the memory size of the M48T35Y-70MH1F?
The memory size is 32 Kb x 8, which is equivalent to 256 Kbit. - What are the supply voltage requirements for the M48T35Y-70MH1F?
The supply voltage (VCC) ranges from 4.5 to 5.5 V. - What is the power-fail deselect voltage (VPFD) range for the M48T35Y-70MH1F?
The VPFD range is from 4.2 to 4.5 V. - What are the operating temperature ranges for the M48T35Y-70MH1F?
The operating temperature ranges from –40 to 85 °C. - What types of packages are available for the M48T35Y-70MH1F?
The device is available in 28-pin DIP CAPHAT™ and 28-pin SOIC packages with a separate SNAPHAT® housing. - How does the real-time clock function in the M48T35Y-70MH1F?
The real-time clock provides BCD coded year, month, day, date, hours, minutes, and seconds with automatic corrections for leap years and month lengths. - How long does the internal battery backup last in the M48T35Y-70MH1F?
The internal battery backup can maintain data for at least 7 years. - What kind of write protection does the M48T35Y-70MH1F offer?
The device features automatic power-fail chip deselect and WRITE protection. - Is the M48T35Y-70MH1F RoHS compliant?
Yes, the device is RoHS compliant with lead-free second level interconnect. - What are some common applications for the M48T35Y-70MH1F?
Common applications include industrial control systems, medical devices, aerospace and defense systems, automotive systems, and data logging and monitoring systems.
