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Technical content
Features
Power-On Reset Generator With Fixed Delay Time of 200ms Manual Reset Input (G660/G661) Available in three RESET Output Options Push-Pull RESET Output (G660L/G662) Push-Pull RESET Output (G660H/G662) Open-Drain RESET Output (G661L) Supply Voltage Supervision Range 2.5V, 3V, 3.3V, 5V Watchdog Timer (G660/G661/G662) Supply Current of 10µA at VCC=3.3V SOT-23-5 Package Temperature Range . . . −40°C to 85°C
Applications
Critical μP and μC Power Monitoring Industrial Equipment Programmable Controls Automotive Systems Portable/Battery-Powered Equipment Intelligent Instruments Wireless Communications Systems Notebook/Desktop Computers General Description The G660/G661/G662 provide circuits initialization and timing supervision, primarily for DSP and proces- sor-based systems. During power-on, RESET (RESET) is asserted when supply voltage VCC be- comes higher than 1.1 V. Thereafter, the supply volt- age supervisor monitors VCC and keeps RESET (RESET) active as long as VCC remains below the threshold voltage VIT+ (1). An internal timer delays the return of the output to the inactive state to ensure proper system reset. The de- lay time, td, starts after VCC has risen above the threshold voltage V IT+. When the supply voltage drops below the threshold voltage V IT- (2), the outputs be- comes active again. No external components are re- quired. All the devices have a fixed-sense threshold voltage V IT- set by an internal voltage divider. The G660/G661 incorporate a manual reset input,MR . A low level at MR causes RESET (RESET) to be- come active. The G660/G661/G662 have WDI pin. The watchdog timer is periodically triggered by a posi- tive or negative transition at WDI. When the supervis- ing system fails to retrigger the watchdog circuit within the time-out interval, t tout, RESET (RESET) becomes active for the time period td. This event also reinitial- izes the watchdog timer. Leaving WDI unconnected disables the watchdog. The product spectrum is designed for supply voltages of 2.5V, 3V, 3.3V, and 5V. The circuits are available in a SOT-23-5 package. Note: (1) VIT+ means the reset voltage of VCC from low to high ( 2 ) V IT- means the reset voltage of VCC from high to low. Pin Configuration Typical Application Circuit RESET (RESET) GND SOT-23-5 WDI43MR VCC ()is for G660H G660/G661 RESET GND SOT-23-5 WDI43 VCC RESET G662 * MR is for G660/G661 ** RESET is for G662 µP VCC RESET I/O GND 3.3V 100nF RESET RESET WDI GND VCC G660/G661/ G662 RESET MR ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A. RESET (RESET) GND SOT-23-5 WDI43MR VCC ()is for G660H G660/G661 RESET GND SOT-23-5 WDI43 VCC RESET G662 * MR is for G660/G661 ** RESET is for G662 µP VCC RESET I/O GND 3.3V 100nF RESET RESET WDI GND VCC G660/G661/ G662 RESET MR µP VCC RESET I/O GND 3.3V 100nF RESET RESET WDI GND VCC G660/G661/ G662 RESET MR ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high T A.