X46402

Temperature under Bias . . . . . . . . . . ........ . 65 to +135
Storage Temperature . . . . . . . . . . . . . ...... . 65 to +150
Voltage on any Pin with respect to V_SS . . ........ . .1V to +7V
D.C. Output Current . . . . . . . . . . . . . . . . . . ...... . . . . . . . 5mA
Lead Temperature (Soldering, 10 seconds) . . ......... . . .300

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and the functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The X46402 combines several functions into one device.

The first is a dual voltage CPU supervisor plus 64Kbit serial EEPROM memory with password protected write and read operations. The size of the password protected area is selectable by 3 control bits. A Write Protect (WP) pin in conjunction with a WPEN bit provides hardware OTP control of the configuration of the array. Password protected areas require 64 bit read or write passwords prior to access. The eighth illegal password entry (regardless of the number of correct entries) sets an OTP tamper bit. This bit is one of the 32 bits in the Device ID. A secondary voltage monitor circuit activates a V2FAIL pin when the secondary supply voltage drops below a V2trip voltage. This circuit is primarily intended to detect the immediate loss of the battery supply.

A low Vcc voltage detect circuit activates a RESET pin when Vcc drops below a V_TRIP voltage. This signal also blocks read or write operations.

A watchdog timer with the time period controlled by three bits provides several possible time out periods from 150ms to 1 minute.