Overview
The M48T35Y-70PC1, produced by STMicroelectronics, is a highly integrated 32 Kb x 8 non-volatile static RAM and real-time clock solution. This monolithic chip is designed to provide a battery-backed memory and real-time clock in a single package. It is pin and function compatible with JEDEC standard 32 Kb x 8 SRAMs, making it easily interchangeable with many ROM, EPROM, and EEPROM sockets. The device features a self-contained battery and crystal in the CAPHAT™ DIP package, ensuring continuous operation even during power failures.
Key Specifications
| Parameter | 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 V ≤ VPFD ≤ 4.5 V |
| Package Type | 28-pin PDIP (CAPHAT™) and 28-pin SOIC |
| Operating Temperature | -40°C to 85°C |
| RoHS Compliance | Ecopack1 (Lead-free second level interconnect) |
| Battery Type | Long life lithium button cell |
| Crystal Type | Quartz crystal |
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.
- 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.
- SOIC package provides direct connection for a SNAPHAT® housing containing the battery and crystal.
- SNAPHAT® housing (battery and crystal) is replaceable.
- Pin and function compatible with JEDEC standard 32 Kb x 8 SRAMs.
- RoHS compliant – Lead-free second level interconnect.
Applications
The M48T35Y-70PC1 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.
- Consumer electronics requiring data logging and timekeeping.
Q & A
- What is the memory size of the M48T35Y-70PC1?
The memory size is 32 Kb x 8 (256 Kbit).
- What are the supply voltage ranges for the M48T35Y-70PC1?
The supply voltage range is 4.5 to 5.5 V.
- What is the power-fail deselect voltage range for the M48T35Y-70PC1?
The power-fail deselect voltage range is 4.2 V ≤ VPFD ≤ 4.5 V.
- What types of packages are available for the M48T35Y-70PC1?
The device is available in 28-pin PDIP (CAPHAT™) and 28-pin SOIC packages.
- What is the operating temperature range for the M48T35Y-70PC1?
The operating temperature range is -40°C to 85°C.
- Is the M48T35Y-70PC1 RoHS compliant?
Yes, it is RoHS compliant with a lead-free second level interconnect.
- What type of battery is used in the M48T35Y-70PC1?
The device uses a long life lithium button cell.
- Can the SNAPHAT® housing be replaced?
Yes, the SNAPHAT® housing (battery and crystal) is replaceable.
- Is the M48T35Y-70PC1 compatible with JEDEC standard SRAMs?
Yes, it is pin and function compatible with JEDEC standard 32 Kb x 8 SRAMs.
- How does the device handle power failures?
The device automatically power-fail deselects and write protects itself when VCC falls within the VPFD window, ensuring data security.
