M41ST87Y and M41ST87W are 5.0V and 3.3/3.0V secure serial RTC and NVRAM supervisors with tamper detection and 128 bytes of clearable NVRAM. They support various operating voltages, have a 400kHz I2C bus, and feature automatic switchover and deselect circuitry. The products have multiple features, including NVRAM supervisor, counters, programmable alarm and interrupt function, programmable watchdog timer, unique electronic serial number, and low battery supply current.
The M41ST87Y and M41ST87W are low-power, static CMOS SRAM devices designed as secure serial RTC and NVRAM supervisors. They feature a built-in 32.768 kHz oscillator with an embedded crystal (in the SOIC package) and 128 bytes of clearable, general-purpose NVRAM. The devices support 5.0 V, 3.3 V, or 3.0 V operation and include security features such as tamper detection circuits with timestamping and automatic RAM clearing.
| Supply Voltage | 5.0, 3.3, or 3.0 V |
|---|---|
| NVRAM Size | 128 bytes |
| Oscillator Frequency | 32.768 kHz |
| Battery Supply Current | 500 nA (typ) |
The device provides 128 bytes of clearable, general purpose NVRAM.
Yes, it includes a programmable watchdog timer.
The device supports 5.0 V, 3.3 V, or 3.0 V operation.