DS1831/T&R datasheet, PDF - EEWORLD Datasheet

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DS1831/T&R: DescriptionPower Supply Support Circuit, Fixed, 4 Channel, PDIP16, 0.300 INCH, DIP-16; CategoryPower/power management The power supply circuit; File Size74KB，14 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1831/T&R Overview

Power Supply Support Circuit, Fixed, 4 Channel, PDIP16, 0.300 INCH, DIP-16

DS1831/T&R Parametric

Parameter Name	Attribute value
Maker	DALLAS
package instruction	0.300 INCH, DIP-16
Reach Compliance Code	unknown
Adjustable threshold	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT
JESD-30 code	R-PDIP-T16
Number of channels	4
Number of functions	1
Number of terminals	16
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
Package shape	RECTANGULAR
Package form	IN-LINE
Certification status	Not Qualified
Maximum supply voltage (Vsup)	5.5 V
Minimum supply voltage (Vsup)	1 V
surface mount	NO
Temperature level	INDUSTRIAL
Terminal form	THROUGH-HOLE
Terminal location	DUAL

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DS1831/A/B

Multi-Supply Micromonitor

www.dalsemi.com

FEATURES

5 volt power-on reset

3.3 (or 3) volt power-on reset

2 referenced comparators with separate

outputs for monitoring additional supplies

Internal power is drawn from higher of either

the IN

input or the IN

3.3V

input

Excellent for systems designed to operate

with multiple power supplies.

Asserts resets during power transients

Pushbutton reset input for system override

Maintains reset for user configurable times

of 10ms, 100ms, or 1 sec

Watchdog timer for software monitoring

(DS1831A)

Precision temperature-compensated voltage

reference and voltage sensor

16 pin DIP & 16 pin 150mil SOIC available

Operating Temperature of -40°C to +85°C

PIN ASSIGNMENT

DS1831

RST

TOL

PBRST

IN1

IN2

GND

3.3V

RST

3.3V

TOL

3.3V

PBRST

3.3V

NMI1

NMI2

MPBRST

16-PIN (300 MIL) DIP

16-PIN (150 MIL) SOIC

DS1831A

IN1

GND

NMI1

WDS

DS1831B

PBRST

IN1

3.3V

PBST

NMI1

DESCRIPTION

The DS1831 Multi-Supply Monitor & Reset monitors up to 4 system voltages: 5 volt supply, 3.3 (or 3)

volt supply, and 2 additional user configurable voltage monitors. DS1831 power for internal operation

comes from the higher voltage level of the 3.3 volt input or the 5 volt input. One of these inputs must be

greater than 1 volt for device operation. Pushbutton (manual reset) functionality is provided for the 5 volt

reset, the 3.3 volt reset or for all reset outputs by the master pushbutton. The DS1831A replaces one

reference comparator and the master pushbutton with watchdog and the DS1831B replaces the 3.3V

PBRST with a last reset status output.

1 of 14

031400

DS1831/A/B

OPERATION – POWER MONITOR

The DS1831 provides the functions of detecting out-of-tolerance conditions on a 3.3 (or 3) volt and 5 volt

power supply and warning a processor based system of impending power failure. When an input is

detected as out-of-tolerance on either voltage input the

RST

for that supply will be forced active low.

When that input returns to a valid state the associated

RST

will remain active for the time delay selected

with the associated TD input and then return to an inactive state until the next input out-of-tolerance

condition.

On power-up both resets are kept active for the selected reset time after the associated power supply input

has reached the selected tolerance. This allows the power supply and system power to stabilize before

RST

is released.

All internal operating current for the DS1831 will be supplied by either the IN

3.3V

or IN

input which

ever has the highest voltage level.

OPERATION - TOLERANCE SELECT

The DS1831 provides 2 TOL inputs for individual customization of the DS1831 to specific application

requirements. If the TOL for the 5 volt supply is tied to the 5 volt input a 5% tolerance is selected. If the

TOL is connected to ground a 10% tolerance is selected or if it is left unconnected a 15% tolerance is

selected. If the TOL for the 3.3 volt supply is tied to the 3.3 volt input a 5% tolerance is selected, a 10%

tolerance is selected if it is connected to ground, and a 20% tolerance is selected if the input is left

unconnected. These tolerance conditions are set at power up and can only be changed by power cycling

the device.

OPERATION - RESET TIME-DELAY SELECT

The DS1831 provides 2 TD inputs for individual customization of reset time-delays and an additional one

for the DS1831A watchdog. TD inputs select time delays for the IN

and IN

3.3V

resets outputs and the

Watchdog on the DS1831A. The reset time delays are shown in table 1. These allow the selection of

minimum delays of 10ms, 100ms, and 1000ms.

Wiring an individual reset output to the push-button input of the other voltage reset allows custom reset

timings or allows for the sequencing of the reset outputs. See figure 2.

These time-delays are set at power-up and cannot be changed after the device reaches an in-tolerance

condition.

TD INPUTS/RESET AND WATCHDOG TIME-DELAYS

Table 1

GND

Float

MIN

10 ms

100 ms

1000 ms

RESET TIME-DELAY

TYP

16 ms

160 ms

1600 ms

MAX

20 ms

200 ms

2000 ms

3 of 14

DS1831/A/B

PUSHBUTTON RESET SEQUENCING

Figure 2

5V Supply

3.3V Supply

DS1831

3.3V

RST

3.3V

TOL

3.3V

PBRST

3.3V

RST

TOL

PBRST

GND

*NOTE:

The

RST

output is connected to the IN

3.3V

via a 100KΩ resistor in the push-button input and therefore

does not require a pull-up resistor (an addition pull up can be used to accelerate responses.) If an external

pull up is used in this example it must be connected to the 3.3 volt power supply.

OPERATION - PUSHBUTTON RESET

The DS1831 provides 3 pushbutton inputs for manual reset of the device. Pushbutton inputs for the 3.3V

reset, 5v reset, and a master pushbutton reset (DS1831 & DS1831B only) input; provide multiple options

for system control. The 3.3 volt pushbutton reset and 5 volt pushbutton resets provide a simple manual

reset for the associated reset output; while the master pushbutton reset forces all resets and NMI outputs

active low.

The 5 volt reset pushbutton input and the 3.3 volt reset pushbutton input provide manual reset control

input for each associated reset output. When the output associated with a pushbutton input is not active, a

pushbutton reset can be generated by pulling the associated

PBRST

pin low for at least 20 µs. When the

pushbutton is held low the reset will be forced active and will remain active for a reset cycle after the

pushbutton is released. See figure 2 for an application example that allows a user to sequence the reset

outputs.

A master pushbutton reset cycle can be started if at least one voltage input (IN

, IN

3.3V

, IN1, or IN2) is in

tolerance and at least 1 output is active. A master pushbutton reset is generated by pulling the

MPBRST

pin low for at least 20 µs. When the pushbutton is held low all outputs are forced active and will remain

active for a reset or NMI time delay after the pushbutton is released. The Master Pushbutton input is

pulled high through an internal 100KΩ pull up resistor and debounced via internal circuitry. See figure 3

for an application example. Figures 4 and 5 for the timing diagram.

The 5V and 3.3V pushbutton reset inputs are pulled high through an internal 100KΩ pull up resistor to

the voltage input, which is associated with that pushbutton. The master pushbutton is pulled to the greater

of the “IN

” and “IN

3.3V

” inputs.

*Caution should be exercised to avoid pulling the pushbutton inputs above associated supply inputs.

Generally all pushbutton inputs should be driven low with open drain inputs.

4 of 14

DS1831/T&R Related Products

	DS1831/T&R	DS1831B/T&R	DS1831A/T&R
Description	Power Supply Support Circuit, Fixed, 4 Channel, PDIP16, 0.300 INCH, DIP-16	Power Supply Support Circuit, Fixed, 4 Channel, PDIP16, 0.300 INCH, DIP-16	Power Supply Management Circuit, Fixed, 4 Channel, PDIP16, 0.300 INCH, DIP-16
Maker	DALLAS	DALLAS	DALLAS
package instruction	0.300 INCH, DIP-16	0.300 INCH, DIP-16	0.300 INCH, DIP-16
Reach Compliance Code	unknown	unknown	unknown
Adjustable threshold	NO	NO	NO
Analog Integrated Circuits - Other Types	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY SUPPORT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 code	R-PDIP-T16	R-PDIP-T16	R-PDIP-T16
Number of channels	4	4	4
Number of functions	1	1	1
Number of terminals	16	16	16
Maximum operating temperature	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	IN-LINE	IN-LINE	IN-LINE
Certification status	Not Qualified	Not Qualified	Not Qualified
Maximum supply voltage (Vsup)	5.5 V	5.5 V	5.5 V
Minimum supply voltage (Vsup)	1 V	1 V	1 V
surface mount	NO	NO	NO
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal form	THROUGH-HOLE	THROUGH-HOLE	THROUGH-HOLE
Terminal location	DUAL	DUAL	DUAL
Base Number Matches	-	1	1

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