TPS386000 Datasheet, PDF (1/28 Pages) Texas Instruments – Quad Supply Voltage Supervisors with Programmable Delay and Watchdog Timer

TPS386000, TPS386020
TPS386040, TPS386060
www.ti.com......................................................................................................................................................................................... SBVS105 – SEPTEMBER 2009
Quad Supply Voltage Supervisors
with Programmable Delay and Watchdog Timer
Check for Samples: TPS386000 TPS386020 TPS386040 TPS386060
FEATURES
1
•2 4 Complete SVS Modules on 1 Silicon Platform
• Programmable Delay Time: 1.4ms to 10s
• Very Low Quiescent Current: 12μA typ
• Threshold Accuracy: 0.25% typ
• Adjustable Threshold Down to 0.4V
• SVS-1: Manual Reset (MR) Input
• SVS-4: Window Comparator or Low-Voltage
Sensing with VREF (1.2V) Pin
• Watchdog Timer with Dedicated Output
• Well-Controlled RESETn Output During
Power-Up
• TPS386000: Open-Drain RESETn and WDO
• TPS386020: Open-Drain RESETn and WDO
• TPS386040: Push-Pull RESETn and WDO
• TPS386060: Push-Pull RESETn and WDO
• Package: 4mm x 4mm, 20-pin QFN
APPLICATIONS
• Analog Sequencing
• All DSP and Microcontroller Applications
• All FPGA/ASIC Applications
DESCRIPTION
The TPS3860x0 family of voltage supervisors can
monitor four power rails that are greater than 0.4V
with a 0.25% (typical) threshold accuracy. Each of the
four supervisory circuits (SVS-n) assert a RESETn or
RESETn output signal when the SENSEm input
voltage drops below the programmed threshold. With
external resistors, the threshold of each SVS-n can
be programmed (where n = 1, 2, 3, 4 and m = 1, 2, 3,
4L, 4H).
Each SVS-n has a programmable delay before
releasing RESETn or RESETn, and the delay time
can be set from 1.4ms to 10s through the CTn pin
connection. Only SVS-1 has an active-low manual
reset (MR) input; a logic-low input to MR asserts
RESET1 or RESET1.
SVS-4 monitors the threshold window using two
comparators. The extra comparator can be
configured as a fifth SVS to monitor negative voltage
with voltage reference output VREF.
The TPS3860x0 has a very low quiescent current of
12μA (typical) and is available in a small, 4mm x
4mm, QFN-20 package.
Sequence: VIN
VCC41(positive)&VCC42(neagtive) VCC3 VCC2 VCC1
EN4 DC-DC
LDO
VCC42
VCC41
VCC3
VCC2
VCC-
AMP
VCC+
VCC1
EN3 DC-DC
LDO
EN2 DC-DC
LDO
VIN
Pos
and
Neg
DC-DC
Sub CPU
MSP430
RS3H RS2H RS1H
RS41H
MR
WDI
SENSE1
SENSE2
SENSE3
SENSE4L
SENSE4H
VCC
TPS386000
VREF
WDO
RESET1
RESET2
RESET3
RESET4
RP5 RP4 RP3 RP2 RP1
VCC1 VCC2 VCC3
RESET ^DSP
CLK
CPU
FPGA
CT1 CT2 CT3
CT4 GND
RS42L
CT1 CT2 CT3
CT4
RS42H RS41L RS3L RS2L RS1L
Figure 1. TPS386000 Typical Application Circuit
1
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated