M41ST87 is a supervisory family circuit that provides the industry with the latest in on-chip security solutions. It can be used in any system to protect sensitive data from tampering. This chip can be used to secure a wide range of applications from credit card machines and point-of-sale (POS) terminals to electric data meters. The M41ST87 features the ability to detect and timestamp any tampering of the system, and corrupt the device memory when the event occurs. This prevents the intruder from accessing data stored in memory by clearing the device memory and/or external RAM when the tampering event occurs.
The document describes the M41ST87 device, a supervisory family circuit designed to protect sensitive data by detecting system tampering. It details two independent tamper input pins (TP1 and TP2) that can monitor signals for closing or opening switches to ground or VDD.
A significant portion of the note covers methods for clearing external memory during a tamper event. It explains how to use an external charge pump device driven by the M41ST87 to apply a negative voltage to the SRAM's VCC pin, ensuring rapid data corruption. The text provides circuit connection diagrams and timing specifications for configuring this process.
| Internal RAM size | 128 bytes |
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It uses an external charge pump to drive the SRAM VCC pin to a negative voltage, which corrupts the data.
The circuit can be used in systems ranging from credit card machines and point-of-sale terminals to electric data meters.
The regulator is switched off for 1, 4, 8, or 16 seconds depending on the register setting.
Certain SRAMs can be corrupted with a negative pulse width of 1 second.