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
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
3/7
TS834
Voltage Threshold (Vthi) vs Temperature
Curre nt Consumption vs Temperat ure
Vol vs Temperature
Output Voltage vs Input
Timer Period (trst) vs Temperature
4/7
Output Voltage vs Input
TS834
Vol v s Is ink
Schematic to Measure Vol vs Isink
Vcc=4V
Vin
TS8 34
Gnd
Reset
Reset
Vcc
Isink
Reset =low
Reset High After Vcc Tansition (timer disabled)
Reset Low After V
Tansition (timer disabled)
cc
Vcc=5V
Vin
TS834
Gnd
Reset
Reset
Vcc
Isink
Reset=low
5/7
TS834
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dim.
Min. Typ. Max. Min. Typ. Max.
A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033
b 0.35 0.48 0.014 0.019
b1 0.19 0.25 0.007 0.010
C 0.25 0.5 0.010 0.020
c1 45° (typ.)
D 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 3.81 0.150
F 3.8 4.0 0.150 0.157
L 0.4 1.27 0.016 0.050
M 0.6 0.024
S 8° (max.)
Millimeters Inches
6/7
TS834
PACKAGE MECHANICAL DATA
8 PINS - THIN SHRINK SMALL OUTL INE PAC KAGE
c
E1
A
A2
A1
D
b
0.25mm
.010 inch
GAGE PLANE
PLANE
SEATING
5
5
8
8
PIN 1 IDENTIFICATION
k
L
L
L1
L1
C
E
4
e
1
14
Millimeters Inches
Dim.
Min. Typ. Max. Min. Typ. Max.
A 1.20 0.05
A1 0.05 0.15 0.01 0.006
A2 0.80 1.00 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.15
c 0.09 0.20 0.003 0.012
D 2.90 3.00 3.10 0.114 0.118 0.122
E 6.40 0.252
E1 4.30 4.40 4.50 0.169 0.173 0.177
e 0.65 0.025
k 0° 8° 0° 8°
l 0.50 0.60 0.75 0.09 0.0236 0.030
L 0.45 0.600 0.75 0.018 0.024 0.030
L1 1.000 0.039
Information furnished is bel ieved to be accurate and reliable. However, STMicroe lectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No li cense is granted by i mp lication or otherwise under a ny patent or patent rig hts of STMicroelectronics. Spec ificat ions
mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information
previously supplied. S TMicroelectronics products are not authorized for use as critica l components in life suppo rt devices or
systems without express written approval of STMicroelectronics.
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© 2001 STM icroelectronics - Pr inted in Italy - All Rights Reserv ed
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