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(R)
TS834
MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE LOW OR HIGH WITH INTEGRATED TIMER
. . . . . . . .
ULTRA LOW POWER CONSUMPTION : 12A max. @ VCC = 5V BOTH ACTIVE HIGH AND ACTIVE LOW OUTPUTS RESET TIMER WITH DISABLE FUNCTION PRECISION RESET THRESHOLD (guaranteed over Temperature) 4.33V typ. THRESHOLD VOLTAGE GUARANTEED RESET OPERATION DOWN TO 1.5V OPEN DRAIN OUTPUT WITH Vol = 450mVtyp. @ Iol = 8mA & VCC = 4V FAST RESPONSE TIME : 20s FOR A 10mV OVERDRIVE 100mV INTERNAL HYSTERESIS
N DIP8 (Plastic Package)
D SO8 (Plastic Micropackage)
ORDER CODES
Part Number TS834-5I Temperature Range -40, +85oC Package N * D *
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 drain output. The threshold voltage is set at 4.33V by internal thermally matched resistors. The comparator exhibits a 20s response (with 10mV overdrive). An internalhysteresisof 100mV increases the comparator noise margin and prevents false reset operation. APPLICATIONS Computers Microcontrollers Microprocessor systems Intelligent instruments Power failure detection
PIN CONNECTIONS
Re s e t Low
1
8
Re s e t High
Vcc
2
7
NC
NC
3
6
NC
. . . . .
Gnd
4
5
Time r Contro l*
* This pin mus t be conne cte d to Vcc or Gnd
April 1999
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TS834
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Vout Iout Pd Toper Tstg
Note: 1. 2.
Parameter Supply Voltage - note 1 Output Voltage - note 1 Output Current Power Dissipation - note 2 Operating Free Air Temperature Range Storage Temperature
All voltages values, except differential voltage are with respect to network ground terminal. Tj = 150oC, Tamb = 25oC with Rthja = 175oC/W for SO8 package Rthja = 100oC/W for DIP8 package
Value 7 -0.3 to VCC + 0.3 20 SO8 DIP8 700 1200 -40 to +85 -65 to +150
Unit V V mA mW
o o
C C
OPERATING CONDITIONS
Symbol VCC Supply Voltage Parameter Value 1.5 to 5.5 Unit V
TS834-5 ELECTRICAL CHARACTERISTICS Tamb = 25oC (unless otherwise specified)
Symbol Vthi Vthd Vhys ICC VOL1 VOL2 IOH1 IOH2 tphl trst Parameter Threshold Voltage VCC Increasing Threshold Voltage VCC Decreasing Hysteresis Voltage Current Consumption Low Level Output Voltage (OUTPUT 1) Low Level Output Voltage (OUTPUT 2) Output Off-state Leakage current (OUTPUT 1) Output Off-state Leakage current (OUTPUT 2) Response Time High to Low Reset Pulse width VCC = 5V VCC = 4V, IOL = 8mA, o -40 Tamb +85 C VCC = 5V, IOL = 8mA, -40 Tamb +85oC VCC = 5V o -40 Tamb +85 C VCC = 4V -40 Tamb +85oC RL = 10k, CL = 15pF VCC = Vthd -10mV Timer enabled o -40 Tamb +85 C 125 450 450 2 2 20 300 500 Test Condition Tamb = 25 C o -40 Tamb +85 C Tamb = 25oC o -40 Tamb +85 C
o
Min. 4.10
Typ. 4.33
Max. 4.46
Unit V V
4.23 4.10 50 100 4.46 200 12 800 1000 800 1000 40 1000 40 1000
mV A mV mV nA nA s ms
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TS834
TIMING DIAGRAMS All the timing diagrams are given with outputs loaded by 10k resistors to VCC.
Vcc+ Input Time r Control Vcc
RES ET OUTP UT Timer Vcc RES ET OUTP UT Vref Time r ena ble : timer con trolto Vcc Time r disa ble : timer control to Gn d GND
Active Low Reset, Timer Enable
Active Low Reset, Timer Disable
Active High Reset, Timer Enable
Active High Reset, Timer Disable
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TS834
Voltage Threshold (Vthi) vs Temperature Current Consumption vs Temperature
Timer Period (trst) vs Temperature
Vol vs Temperature
Output Voltage vs Input
Output Voltage vs Input
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TS834
Vol vs Isink Schematic to Measure Vol vs Isink
Vcc Vcc=4V
TS834
Reset Vin Gnd Reset
Isink Reset =low
Vcc=5V
Vcc
TS834
Reset Vin Gnd Reset
Isink Reset=low
Reset Low After a Vcc Transition (timer disabled)
Reset High After Vcc Transition (timer disabled)
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TS834
PACKAGE MECHANICAL DATA 8 PINS - PLASTIC PACKAGE
Dimensions A a1 B b b1 D E e e3 e4 F i L Z
Min. 0.51 1.15 0.356 0.204 7.95
Millimeters Typ. 3.32
Max.
Min. 0.020 0.045 0.014 0.008 0.313
Inches Typ. 0.131
Max.
1.65 0.55 0.304 10.92 9.75 2.54 7.62 7.62 6.6 5.08 3.81 1.52
0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0260 0.200 0.150 0.060
3.18
0.125
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TS834
PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO)
Dim. A a1 a2 a3 b b1 C c1 D E e e3 F L M S
Min. 0.1 0.65 0.35 0.19 0.25 4.8 5.8
Millimeters Typ.
Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2
o
Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228
Inches Typ.
Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244
1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.)
o
0.050 0.150 0.150 0.016 0.157 0.050 0.024
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such info rmation nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publi cation are subject to change without notice. This publ ication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for useas critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a trademark of STMicroelectronics (c) 1999 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. (c) http://www.st.com
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