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UCC1946 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC1946 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 6 page UCC1946 UCC2946 UCC3946 SLUS247B - FEBRUARY 2000 FEATURES • Fully Programmable Reset Threshold • Fully Programmable Reset Period • Fully Programmable Watchdog Period • 2% Accurate Reset Threshold • VDD Can Go as Low as 2V • 18 µA Maximum IDD • Reset Valid Down to 1V Microprocessor Supervisor with Watchdog Timer 6 7 WDI WP 8 VDD 3RES 5 POWER TO CIRCUITRY A3 A2 A1 A0 CLK CLR 8-BIT COUNTER 400nA WDO 1 GND EDGE DETECT WATCHDOG TIMING 100mV 1.235V 2 RTH 4 RP 1.235V . 400nA POWER ON RESET BLOCK DIAGRAM Note: Pinout represents the 8-pin TSSOP package. UDG-98001 DESCRIPTION The UCC3946 is designed to provide accurate microprocessor supervi- sion, including reset and watchdog functions. During power up, the IC asserts a reset signal RES with VDD as low as 1V. The reset signal re- mains asserted until the VDD voltage rises and remains above the re- set threshold for the reset period. Both reset threshold and reset period are programmable by the user. The IC is also resistant to glitches on the VDD line. Once RES has been deasserted, any drops below the threshold voltage need to be of certain time duration and voltage mag- nitude to generate a reset signal. These values are shown in Figure 1. An I/O line of the microprocessor may be tied to the watchdog input (WDI) for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user, WDO will be asserted. The watchdog function will be disabled during reset conditions. The UCC3946 is available in 8-pin SOIC(D), 8-pin DIP (N or J) and 8-pin TSSOP(PW) packages to optimize board space. |
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