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TPS3850G50DRCT Datasheet(PDF) 6 Page - Texas Instruments |
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TPS3850G50DRCT Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 35 page  6 TPS3850 SBVS301 – OCTOBER 2016 www.ti.com Product Folder Links: TPS3850 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated (1) During power-on, VDD must be a minimum 1.6 V for at least 300 µs before the output corresponds to the SENSE voltage. (2) 0 refers to VSET ≤ VIL, 1 refers to VSET ≥ VIH. (3) If this watchdog ratio is used, then tWDL(max) can overlap tWDU(min). 6.6 Timing Requirements MIN TYP MAX UNIT GENERAL tINIT CWD, CRST pin evaluation period 381 µs tSET Time required between changing SET0 and SET1 pins 500 µs SET0, SET1 pin setup time 1 µs Startup delay(1) 300 µs RESET FUNCTION tRST Reset timeout period CRST = NC 170 200 230 ms CRST = 10 kΩ to VDD 8.5 10 11.5 ms tRST-DEL VSENSE to RESET delay VDD = 5 V, VSENSE = VIT+(OV) + 2.5% 35 µs VDD = 5 V, VSENSE = VIT-(UV) – 2.5% 17 WINDOW WATCHDOG FUNCTION WD ratio Window watchdog ratio of lower boundary to upper boundary CWD = programmable, SET0 = 0, SET1 = 0(2) 1/8 CWD = programmable, SET0 = 1, SET1 = 1 (2) 1/2 CWD = programmable, SET0 = 0, SET1 = 1 (2)(3) 3/4 tWDL Window watchdog lower boundary CWD = NC, SET0 = 0, SET1 = 0 19.1 22.5 25.9 ms CWD = NC, SET0 = 0, SET1 = 1 1.5 1.85 2.2 ms CWD = NC, SET0 = 1, SET1 = 0 Watchdog disabled CWD = NC, SET0 = 1, SET1 = 1 680 800 920 ms CWD = 10 kΩ to VDD, SET0 = 0, SET1 = 0 7.7 9.0 10.4 ms CWD = 10 kΩ to VDD, SET0 = 0, SET1 = 1 7.7 9.0 10.4 ms CWD = 10 kΩ to VDD, SET0 = 1, SET1 = 0 Watchdog disabled CWD = 10 kΩ to VDD, SET0 = 1, SET1 = 1 1.5 1.85 2.2 ms tWDU Window watchdog upper boundary CWD = NC, SET0 = 0, SET1 = 0 46.8 55.0 63.3 ms CWD = NC, SET0 = 0, SET1 = 1 22.0 27.5 33.0 ms CWD = NC, SET0 = 1, SET1 = 0 Watchdog disabled CWD = NC, SET0 = 1, SET1 = 1 1360 1600 1840 ms CWD = 10 kΩ to VDD, SET0 = 0, SET1 = 0 92.7 109.0 125.4 ms CWD = 10 kΩ to VDD, SET0 = 0, SET1 = 1 165.8 195.0 224.3 ms CWD = 10 kΩ to VDD, SET0 = 1, SET1 = 0 Watchdog disabled CWD = 10 kΩ to VDD, SET0 = 1, SET1 = 1 8.8 11.0 13.2 ms tWD-setup Setup time required for device to respond to changes on WDI after being enabled 150 µs Minimum WDI pulse duration 50 ns tWD-del WDI to WDO delay 50 ns |
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