Datasheet

T
POR
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V33D
IReset
3.3 V
T
POR
VGH
VGL
Vres
t
t
Brown Out
UCD3138
SLUSAP2F –MARCH 2012 –REVISED NOVEMBER 2013 www.ti.com
Figure 3-2. Bus Timing in Extended Mode
3.6 Power On Reset (POR) / Brown Out Reset (BOR)
Figure 3-3. Power On Reset (POR) / Brown Out Reset (BOR)
VGH – This is the V33D threshold where the internal power is declared good. The UCD3138 comes
out of reset when above this threshold.
VGL – This is the V33D threshold where the internal power is declared bad. The device goes into
reset when below this threshold.
V
res
– This is the V33D threshold where the internal reset signal is no longer valid. Below this
threshold the device is in an indeterminate state.
I
Reset
– This is the internal reset signal. When low, the device is held in reset. This is equivalent to
holding the reset pin on the IC high.
T
POR
– The time delay from when VGH is exceeded to when the device comes out of reset.
Brown – This is the V33D voltage threshold at which the device sets the brown out status bit. In
Out addition an interrupt can be triggered if enabled.
20 Electrical Specifications Copyright © 2012–2013, Texas Instruments Incorporated
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