X5168
CPU Supervisor with 16Kbit SPI EEPROM

Key Features

• Low V_CC Detection and Reset Assertion
• Five standard reset threshold voltages
• Re-program low V_CC reset threshold voltage using special programming sequence
• Reset signal valid to V_CC = 1V
• Long Battery Life with Low Power Consumption
• <50µA max standby current, watchdog on
• <1µA max standby current, watchdog off
• <400µA max active current during read
• 16Kbits of EEPROM
• Built-in Inadvertent Write Protection
• Power-up/power-down protection circuitry
• Protect 0, 1/4, 1/2 or all of EEPROM array with Block Lock™ protection
• In circuit programmable ROM mode
• 2MHz SPI Interface Modes (0,0 & 1,1)
• Minimize EEPROM Programming Time
• 32-byte page write mode
• Self-timed write cycle
• 5ms write cycle time (typical)
• 2.7V to 5.5V and 4.5V to 5.5V Power Supply Operation
• Available Packages
• 14 Ld TSSOP, 8 Ld SOIC, 8 Ld PDIP
• Pb-Free Plus Anneal Available (RoHS Compliant)

Description

These devices combine three popular functions, Power-on Reset Control, Supply Voltage Supervision, and Block Lock Protect Serial EEPROM Memory in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

Applying power to the device activates the power-on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and oscillator to stabilize before the processor can execute code.

The device's low V_CC detection circuitry protects the user's system from low voltage conditions by holding RESET/RESET active when V_CC falls below a minimum V_CC trip point. RESET/RESET remains asserted until V_CC returns to proper operating level and stabilizes. Five industry standard VTRIP thresholds are available, however, Intersil's unique circuits allow the threshold to be reprogrammed to meet custom requirements or to fine-tune the threshold in applications requiring higher precision.