Key facts
- Brand
- STMicroelectronics
- Model
- M41ST87
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-09
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STMicroelectronics M41ST87Y/M41ST87W Secure Serial RTC and NVRAM Supervisor Datasheet
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.
Read onlineSTMicroelectronics M41ST87 specifications
| 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) |
Source: STMicroelectronics M41ST87Y/M41ST87W Secure Serial RTC and NVRAM Supervisor Datasheet
All STMicroelectronics M41ST87 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the NVRAM capacity?
The device provides 128 bytes of clearable, general purpose NVRAM.
From: STMicroelectronics M41ST87Y/M41ST87W Secure Serial RTC and NVRAM Supervisor Datasheet
Does the device include a watchdog timer?
Yes, it includes a programmable watchdog timer.
From: STMicroelectronics M41ST87Y/M41ST87W Secure Serial RTC and NVRAM Supervisor Datasheet
How does the M41ST87 clear external memory?
It uses an external charge pump to drive the SRAM VCC pin to a negative voltage, which corrupts the data.
From: AN1879 Application Note: Using M41ST87 Tamper Detect and RAM Clear
What applications is the M41ST87 circuit designed to secure?
The circuit can be used in systems ranging from credit card machines and point-of-sale terminals to electric data meters.
From: AN1879 Application Note: Using M41ST87 Tamper Detect and RAM Clear