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TPS3850G18DRCR Fiches technique(PDF) 6 Page - Texas Instruments

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No de pièce TPS3850G18DRCR
Description  Precision Voltage Supervisor with Programmable Window Watchdog Timer
Download  35 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3850G18DRCR Fiches technique(HTML) 6 Page - Texas Instruments

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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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