ST TS834 User Manual

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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
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
NC
Timer Control*
January 2001
1/7
TS834
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V V
T
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
V
V
I
V
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
amb
= 25°C
amb
amb
= 10kΩ, CL = 15pF, VCC = V
L
C/W for TSSOP8 package
amb
≤ +85°C
≤ +85°C
≤ +85°C
amb
-0.3 to V
TSSOP8
= 25°C (unless otherwise specified)
4.10
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
mV
nA
nA
µ
A
s
ms
2/7
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
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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