ST TS834 User Manual

p

TS834

MICROPOWER VOLTAGE SUPERVISOR

RESET ACTIVE LOW OR HIGH INTEGRATED TIMER

■ ULTRA LOW POWER CONSUMPTION :

12µA max.

@ V

CC

= 5V

■ BOTH ACTIVE HIGH AND ACTIVE LOW

OUTPUTS

■ RESET TIMER WITH DISABLE FUNCTION

■ PRECISION RESET THRESHOLD (guaran-

teed over Temperature)

■ 4.33V typ. THRESHOLD VOLTAGE

■ GUARANTEED RESET OPERATION DOWN

TO 1.5V

■ OPEN DRAIN OUTPUT WITH

■ Vol = 450mV typ.@ Iol = 8mA & V

CC

= 4V

■ F AST RESPONSE TIME : 20µ s FOR A 10mV

OVERDRIVE

■ 100mV INTERNAL HYSTERESIS

DESCRIPTION

The TS834 is a voltage supervisor providing two different outputs (one active low and one active high) with an integrated timer that can be disabled.

It incorporates a high stability bandgap voltage reference and a comparator with open d rain output.

The threshold voltage is s et at 4.33V by internal thermally matched resistors.

The comparator exhibits a 20µs response (with 10mV overdrive).

An internal hysteresis of 100mV increases the comparator noise margin and prevents false reset

operation.

APPLICATION

■ Computers

■ Microcontrollers

■ Microprocessor systems

■ Intelligent instruments

■ Power failure detection

D

SO8

(Plastic Micropackage)

P

TSSOP8

(Thin Shrink Small Outline Package)

ORDER CODE

Part Number Temperature Range

TS834-5I -40, +85°C

D = Small Outline Package (SO) - also available in Tape & Reel (DT) P = Thin Shrink Small Outline Package (TSSOP) - only available

in Tape & Reel (PT)

Package

DP

••

PIN CONNECTIONS (top view)

Reset Low

Vcc

NC

Gnd

* This

1

2

3

4

in must be connected to Vcc or Gnd

8

7

6

5

Reset High

NC

Timer Control*

January 2001

1/7

TS834

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V V

T

1. All voltages values, except differential voltage are with respect to network ground terminal.

2. T

j

Supply Voltage

CC

Output Voltage - See note 1

out

I

Output Current 20 mA

out

Pd

Power Dissipation

Operating Free Air Temperature Range -40 to +85 °C

oper

Storage Temperature -65 to +150 °C

stg

= 150°C, T

= 25oC with Rthja = 175oC/W for SO8 package

amb

OPERATING CONDITIONS

Symbol Parameter Value Unit

V

T

Supply Voltage 1.5 to 5.5 V

CC

Operating Free Air Temperature Range -40 to +85 °C

oper

TS834-5 ELECTRICAL CHARACTERISTICS T

Symbol Parameter Min. Typ. Max. Unit

Threshold Voltage - VCC Increasing

V

I

V

I

OH1

I

OH2

tphl

trst

thi

thd

hys

CC

OL1

OL2

T

-40°C ≤ T

Threshold Voltage - VCC Decreasing

T

-40°C ≤ T

Hysteresis Voltage 50 100 200 mV Current Consumption VCC = 5V Low Level Output Voltage VCC = 4V, IOL = 8mA

(OUTPUT 1) -40°C ≤ T Low Level Output Voltage VCC = 5V, IOL = 8mA

(OUTPUT 2) -40°C ≤ T Low Level Output Voltage VCC = 5V

(OUTPUT 1) -40°C ≤ T Low Level Output Voltage VCC = 4V

(OUTPUT 2) -40°C ≤ T Response Time High to Low

R

Reset Pulse width (Timer enabled)

-40°C ≤ T

1)

2)

SO8

o

Rthja = 200

= 25°C

amb

= 25°C

amb

= 10kΩ, CL = 15pF, VCC = V

L

C/W for TSSOP8 package

amb

≤ +85°C

amb

-0.3 to V

TSSOP8

= 25°C (unless otherwise specified)

4.10

≤ +85°C

amb

≤ +85°C

amb

≤ +85°C

amb

≤ +85°C

amb

-10mV

thd

125 300 500

7V

700

+ 0.3

cc

V

mW

625

4.33

V

4.46

4.23

V

4.46

12

450 800

1000

450 800

1000

240

1000

240

1000

20

µ

mV

nA

µ

A

s

ms

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TS834

TIMING DIAGRAMS

All the timung diagrams are given with outputs loaded by 10 kΩ resistors to V

CC

Vcc+ Input

Vref

GND

Active Low Reset, Timer Enabled

Timer

Vcc

Timer enable : timer control to Vcc Timer disable : timer control to Gnd

Timer Control

RESET

OUTPUT

RESET

OUTPUT

Active High Reset, Timer Enabled

Active Low Reset, Timer Disabled

Active High Reset, Timer Disabled

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