Overview
The M48Z35Y-70PC1 is a 256 Kbit (32 Kbit x 8) ZEROPOWER® SRAM produced by STMicroelectronics. This non-volatile static RAM integrates power-fail deselect circuitry and battery control logic on a single die, providing a highly integrated battery-backed memory solution. It is pin and function compatible with JEDEC standard 32 K x 8 SRAMs and can easily fit into many ROM, EPROM, and EEPROM sockets, offering the non-volatility of PROMs without special WRITE timing or limitations on the number of WRITEs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Memory Size | 256 Kbit (32 Kbit x 8) | |
| Supply Voltage (VCC) | 4.5 to 5.5 V | V |
| Power-Fail Deselect Voltage (VPFD) | 4.2 to 4.5 V | V |
| Ambient Operating Temperature (TA) | 0 to 70 °C | °C |
| Package Type | PDIP 28.7 | |
| READ Cycle Time | 70 ns | ns |
| WRITE Cycle Time | 70 ns | ns |
| Address Valid to Output Valid | 70 ns | ns |
Key Features
- Integrated, ultra-low power SRAM, power-fail control circuit, and battery.
- READ cycle time equals WRITE cycle time.
- Automatic power-fail chip deselect and WRITE protection.
- Self-contained battery in the CAPHAT™ DIP package.
- Packaging includes a 28-lead SOIC and SNAPHAT® top (to be ordered separately).
- Pin and function compatible with JEDEC standard 32 K x 8 SRAMs.
- RoHS compliant and lead-free second level interconnect.
Applications
The M48Z35Y-70PC1 is suitable for various applications requiring non-volatile memory, such as industrial control systems, medical devices, automotive systems, and any system where data retention during power failure is critical. It can replace traditional ROM, EPROM, and EEPROM solutions due to its non-volatility and ease of use.
Q & A
- What is the memory size of the M48Z35Y-70PC1?
The memory size is 256 Kbit (32 Kbit x 8). - What are the supply voltage and power-fail deselect voltage ranges for the M48Z35Y-70PC1?
The supply voltage (VCC) range is 4.5 to 5.5 V, and the power-fail deselect voltage (VPFD) range is 4.2 to 4.5 V. - What is the operating temperature range for the M48Z35Y-70PC1?
The ambient operating temperature range is 0 to 70 °C. - What types of packages are available for the M48Z35Y?
The device is available in PDIP 28.7 and SOIC 28 packages. - How does the power-fail protection work?
The device has an integrated power-fail detect circuit that write protects the SRAM when VCC falls below a certain threshold, and it switches to battery power to maintain data. - Is the M48Z35Y compatible with standard SRAMs?
Yes, it is pin and function compatible with JEDEC standard 32 K x 8 SRAMs. - What is the purpose of the SNAPHAT battery package?
The SNAPHAT battery package provides a separate housing for the battery that can be mounted on top of the SOIC package after surface mounting, preventing potential battery damage. - Is the M48Z35Y RoHS compliant?
Yes, the device is RoHS compliant and has a lead-free second level interconnect. - What are some typical applications for the M48Z35Y-70PC1?
Typical applications include industrial control systems, medical devices, automotive systems, and any system requiring non-volatile memory during power failure. - How long does the battery maintain data after power failure?
The internal button cell maintains data for an extended period; for specific details, refer to the application note AN1012.
