Overview
The M48Z128Y-85PM1 is a non-volatile static RAM (SRAM) produced by STMicroelectronics. This device is part of the ZEROPOWER® RAM family, combining an internal lithium battery, a CMOS SRAM, and a control circuit within a single 32-pin DIP module. It is designed to provide a highly integrated battery-backed memory solution, ensuring data retention for up to 10 years in the absence of power. Although it is not recommended for new designs, it remains a viable option for existing systems due to its compatibility with JEDEC standard 128 K x 8 SRAMs and its ability to fit into many ROM, EPROM, and EEPROM sockets.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Capacity | 128 Kbit x 8 | 131,072 words by 8 bits |
| Supply Voltage (VCC) | 4.5 to 5.5 V | |
| Power-Fail Deselect Voltage (VPFD) | 4.2 to 4.5 V | |
| Battery Backup Switchover Voltage (VSO) | 3.0 V | |
| Data Retention Time | 10 years | |
| Access Time | 85 ns | |
| Operating Temperature | 0 to 70 °C | |
| Package | 32-pin DIP |
Key Features
- Integrated ultra-low power SRAM, power-fail control circuit, and battery.
- Conventional SRAM operation with unlimited WRITE cycles.
- Automatic power-fail chip deselect and WRITE protection.
- Battery internally isolated until power is first applied.
- Pin and function compatible with JEDEC standard 128 K x 8 SRAMs.
- RoHS compliant with lead-free second level interconnect.
Applications
The M48Z128Y-85PM1 is suitable for various applications requiring non-volatile memory, such as:
- Industrial control systems.
- Medical devices.
- Aerospace and defense systems.
- Automotive systems.
- Any system needing reliable, long-term data storage without the need for periodic refresh.
Q & A
- What is the capacity of the M48Z128Y-85PM1?
The M48Z128Y-85PM1 has a capacity of 128 Kbit x 8, organized as 131,072 words by 8 bits.
- What is the supply voltage range for the M48Z128Y-85PM1?
The supply voltage range is 4.5 to 5.5 V.
- What is the power-fail deselect voltage (VPFD) for the M48Z128Y-85PM1?
The VPFD is between 4.2 and 4.5 V.
- How long does the battery maintain data in the absence of power?
The battery maintains data for up to 10 years.
- Is the M48Z128Y-85PM1 compatible with standard SRAMs?
Yes, it is pin and function compatible with JEDEC standard 128 K x 8 SRAMs.
- What is the operating temperature range for the M48Z128Y-85PM1?
The operating temperature range is 0 to 70 °C.
- What type of package does the M48Z128Y-85PM1 come in?
The device comes in a 32-pin DIP package.
- Is the M48Z128Y-85PM1 RoHS compliant?
Yes, it is RoHS compliant with lead-free second level interconnect.
- Why is the M48Z128Y-85PM1 not recommended for new designs?
Although it is still in production, it is not recommended for new designs due to the availability of more modern alternatives.
- How does the power-fail control circuit work?
The control circuit monitors the VCC supply and automatically switches to battery power when VCC falls below the switchover voltage, ensuring data security and retention.
