UCD3138RMHT datasheet(20/78 Pages) TI1

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TPOR

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V33D

IReset

3.3 V

TPOR

VGH

VGL

Vres

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.

Vres

– This is the V33D threshold where the internal reset signal is no longer valid. Below this

threshold the device is in an indeterminate state.

IReset

– 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.

TPOR

– 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.

Electrical Specifications

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