DESCRIPTION
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.

FEATURES
• Dual Voltage Detection and Reset Assertion
   —Low Vcc Monitor
   —Low V2MON Monitor
   —Low Vcc Block of EEPROM Writes
   —RESET Signal Valid down to Vcc=1V
• Selectable Watchdog Timer
   —150ms, 450ms, 1s, 5s, 10s, 20s, 1min, OFF
• Volatile Flag shows Watchdog/Low Voltage Reset
• 64kbit 2-wire Serial EEPROM
   —1MHz Serial Interface speed
   —64-Byte Page Write Mode
• Two 64-Byte OTP memory blocks
   —Requires 64-bit OTP password to write
• Adjustable size Password Protected Array
   —64 Bit Read and Write Array Passwords 
   —Non-password protected array area
• 8 count tamper counter for invalid passwords
• Operates at 2.5-3.7V
• 8L TSSOP package