X40021

Features:

• Dual voltage detection and reset assertion
-Three standard reset threshold settings(4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
-V_TRIP2 Programmable down to 0.9V
-Adjust low voltage reset threshold voltages using special programming sequence
-Reset signal valid to V_CC = 1V
-Monitor two voltages or detect power fail
• Battery Switch Backup
• VOUT: 5mA to 50mA from V_CC; 250A from V_BATT
• Fault detection register
• Selectable power-on reset timeout(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval(25ms, 200ms, 1.4s, off)
• Debounced manual reset input
• Low power CMOS
-25A typical standby current, watchdog on
-6A typical standby current, watchdog off
-1A battery current in backup mode
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
-14-lead SOIC, TSSOP
• Monitor Voltages: 5V to 1.6V
• Memory Security
• Battery Switch Backup
• VOUT 5mA to 50mA




Application

• Communications Equipment
-Routers, Hubs, Switches
-Disk arrays
• Industrial Systems
-Process Control
-Intelligent Instrumentation
• Computer Systems
-Desktop Computers
-Network Servers




Pinout

Specifications

Temperature under bias .................... -65°C to +135°C
Storage temperature ......................... -65°C to +150°C
Voltage on any pin with
respect to V_SS ...................................... -1.0V to +7V
D.C. output current ....................................................5mA
Lead temperature (soldering, 10 seconds)........... 300°C




Description

The X40021 combines power-on reset control, watchdog timer, supply voltage supervision, and secondary supervision, and manual reset, in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. Applying voltage to VCC activates the power-on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code.