G660/G661/G662 Microprocessor Reset IC Global Mixed-mode Technology Features General Description 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 The G660/G661/G662 provide circuits initialization and timing supervision, primarily for DSP and processor-based systems. During power-on, RESET (RESET) is asserted when supply voltage VCC becomes higher than 1.1 V. Thereafter, the supply voltage 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 delay time, td, starts after VCC has risen above the threshold voltage VIT+. When the supply voltage drops below the threshold voltage VIT-(2), the outputs becomes active again. No external components are required. All the devices have a fixed-sense threshold voltage VIT- set by an internal voltage divider. 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 The G660/G661 incorporate a manual reset input, MR . A low level at MR causes RESET (RESET) to become active. The G660/G661/G662 have WDI pin. The watchdog timer is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET (RESET) becomes active for the time period td. This event also reinitializes 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) VIT- means the reset voltage of VCC from high to low. Pin Configuration Typical Application Circuit 3.3V G660/G661 RESET (RESET) 1 GND 2 MR 3 5 4 SOT-23-5 VCC RESET WDI 1 GND 2 RESET 3 100nF VCC G662 5 RESET VCC VCC RESET µP G660/G661/ G662 * MR 4 WDI WDI RESET GND I/O RESET GND SOT-23-5 ()is for G660H * MR is for G660/G661 ** RESET is for G662 ICC may increased at high TA, Therefore, can not connect Resistors to VCC to prevent Icc abnormal behavior at high TA. Ver: 0.7 Apr 09, 2012 TEL: 886-3-5788833 http://www.gmt.com.tw 1