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TPS3850G25QDRCRQ1 Datasheet(PDF) 6 Page - Texas Instruments |
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TPS3850G25QDRCRQ1 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 39 page 6 TPS3850-Q1 SBVS264 – JANUARY 2017 www.ti.com Product Folder Links: TPS3850-Q1 Submit Documentation Feedback Copyright © 2017, 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 at 1.6 V ≤ VDD ≤ 6.5 V over the operating temperature range of –40°C ≤ TA, TJ ≤ +125°C (unless otherwise noted); the open- drain pullup resistors are 10 kΩ for each output; typical values are at TJ = 25°C MIN TYP MAX UNIT GENERAL tINIT CWD, CRST pin evaluation period 381 µs tSET Time required between changing the 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 1.48 1.85 2.22 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 7.65 9.0 10.35 ms CWD = 10 kΩ to VDD, SET0 = 0, SET1 = 1 7.65 9.0 10.35 ms CWD = 10 kΩ to VDD, SET0 = 1, SET1 = 0 Watchdog disabled CWD = 10 kΩ to VDD, SET0 = 1, SET1 = 1 1.48 1.85 2.22 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 23.375 27.5 31.625 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 9.35 11.0 12.65 ms tWD-setup Setup time required for the 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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