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The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ ADM6321/ADM6322 are supervisory circuits, which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power on reset signals, an on-chip watchdog timer can reset the micro-processor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external push-button, through a manual reset input. The seven parts feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in Table 1.
Each part is available in a choice of 26 reset threshold options ranging from 2.5 V to 5 V in 100 mV increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (min) and four watchdog timeout options of 6.3 ms, 102 ms, 1600 ms, and 25.6s (typ).
The ADM6316ADM6322 are available in 5-lead SOT-23 packages and typically consume only 3 µA, making them suitable for use in low power portable applications.
ADM6322 Maximum Ratings
Parameter
Rating
VCC RESET (ADM6320, ADM6321, ADM6322) All Other Pins Output Current (RESET, RESET) Operating Temperature Range Storage Temperature Range JA Thermal Impedance, SOT-23 Lead Temperature Soldering (10 s) Vapour Phase (60 s) Infrared (15 s)
0.3 V to +6 V 0.3 V to +6 V 0.3 V to (VCC + 0.3 V) 20 mA 40°C to +85°C 65°C to +125°C 270°C/W
300°C 215°C 220°C
ADM6322 Features
26 reset threshold options: 2.5 V to 5 V in 100 mV increments 4 reset timeout options: 1 ms, 20 ms, 140 ms, and 1120 ms (min) 4 watchdog timeout options: 6.3 ms, 102 ms, 1600 ms, and 25.6s (typ) Manual reset input Reset output stages: Push-pull active-low Open-drain active-low Push-pull active-high Low power consumption (5 µA) Guaranteed reset output valid to VCC = 1 V Power supply glitch immunity Specified over industrial temperature range 5-lead SOT-23 package
ADM6322 Typical Application
Microprocessor systems Computers Controllers Intelligent instruments Portable equipment