Datasheet

TPS3813J25, TPS3813L30
TPS3813K33, TPS3813I50
SLVS331G –DECEMBER 2000–REVISED OCTOBER 2013 www.ti.com
TIMING REQUIREMENTS
At R
L
= 1 MΩ, C
L
= 50 pF, and T
A
= –40°C to +85°C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
w
Pulse width at V
DD
V
DD
= V
IT–
+ 0.2 V, V
DD
= V
IT–
– 0.2 V 3 μs
SWITCHING CHARACTERISTICS
At R
L
= 1 MΩ, C
L
= 50 pF, and T
A
= -40°C to +85°C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
t
d
Delay time V
DD
≥ V
IT
+ 0.2 V, See timing diagram 20 25 30 ms
WDT = 0 V 0.2 0.25 0.3
s
t
t(out)
Watchdog time-out Upper limit WDT = V
DD
2 2.5 3
WDT = programmable
(1)
See
(2)
ms
WDR = 0 V, WDT = 0 V 1:31.8
WDR = 0 V, WDT = V
DD
1:32
WDR = 0 V, WDT = programmable 1:25.8
Watchdog window ratio
WDR = V
DD
, WDT = 0 V 1:124.9
WDR = V
DD
, WDT = V
DD
1:127.7
WDR = V
DD
, WDT = programmable 1:64.5
Propagation (delay) time,
t
PHL
V
DD
to RESET delay V
IL
= V
IT
– 0.2 V, V
IH
= V
IT
+ 0.2 V 30 50 μs
high-to-low-level output
(1) 155 pF < C
(ext)
< 63 nF
(2) (C
(ext)
÷ 15.55 pF + 1) × 6.25 ms
Table 1. TPS3813 FUNCTION/TRUTH TABLE
V
DD
> V
IT
RESET
0 L
1 H
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