Reset

Logic

Timer

+

−

90k

V

DD

GND

0.4 V

V

REF

SENSE

MR

C

T

RESET

R

2

R

Reset

Logic

Timer

+

−

90k

V

DD

GND

0.4 V

V

REF

SENSE

MR

C

T

RESET

TPS3808G01-Q1, TPS3808G12-Q1, TPS3808G125-Q1, TPS3808G15-Q1

TPS3808G18-Q1, TPS3808G30-Q1, TPS3808G33-Q1, TPS3808G50-Q1

SBVS085I – JANUARY 2007 – REVISED JUNE 2015

www.ti.com

8 Detailed Description

8.1 Overview

The TPS3808Gxx-Q1 devices are low-current supervisory circuits used to monitor system voltages ranging from

0.4 V to 5 V. The devices assert an active low, open-drain RESET signal when the SENSE voltage drops below

a preset threshold or when the manual reset (MR) pin is asserted to a logic low. The RESET output remains low

for the user-adjustable delay time after the SENSE voltage and MR return above their thresholds. The devices

are also designed to be immune to short negative transients on the SENSE pin. The reset delay time can be

8.2 Functional Block Diagrams

Figure 6. Adjustable-Voltage Version

Figure 7. Fixed-Voltage Version

8

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Product Folder Links: TPS3808G01-Q1 TPS3808G12-Q1 TPS3808G125-Q1 TPS3808G15-Q1 TPS3808G18-Q1

TPS3808G30-Q1 TPS3808G33-Q1 TPS3808G50-Q1