X40034

Features:

• Triple voltage detection and reset assertion
-Standard reset threshold settings See selection table on page 2.
-Adjust low voltage reset threshold voltages using special programming sequence
-Reset signal valid to V_CC = 1V
-Monitor three seperate voltages
• Fault detection register
• Selectable power on reset timeout (0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval (25ms, 200ms, 1.4s or off)
• Debounced manual reset input
• Low power CMOS
-25A typical standby current, watchdog on
-6A typical standby current, watchdog off
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
-14-lead SOIC, TSSOP
• Monitor Voltages: 5V to 0.9V
• Independent Core Voltage Monitor




Application

• Communication Equipment
-Routers, Hubs, Switches
-Disk arrays, Network Storage
• Industrial Systems
-Process Control
-Intelligent Instrumentation
• Computer Systems
-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 X40030, X40031, X40034, X40035 combine power-on reset control, watchdog timer, supply voltage supervision, second and third voltage 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 of X40034 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. Low VCC detection circuitry protects the users system from low voltage conditions, resetting the system when VCC falls below the minimum VTRIP1 point. RESET/RESET is active until VCC returns to proper operating level and stabilizes. A second and third voltage monitor circuit tracks the unregulated supply to provide a power fail warning or monitors different power supply voltage. Three common low voltage combinations are available, however, Intersils unique circuits allows the threshold for either voltage monitor to be reprogrammed to meet specific system level requirements or to fine-tune the threshold for applications requiring higher precision.