TS823/824/825 Series
Microprocessor Supervisory Circuit
with Watchdog Timer & Manual Reset
SOT-25
General Description
The TS823/824/825 family allows the user to customize the CPU monitoring function without any external
components. The user has a large choice of reset voltage thresholds and output driver configurations, all of which are
present ant the factory. Each wafer is trimmed to the customer’s specifications.
These circuits will ignore fast negative going transients on Vdd. The state of the reset output is guaranteed to be
correct down to 1V. After Vdd crosses above a factory present threshold, the TS823/824/825 assert a reset signal.
After a predetermined time (the “reset” interval) the reset is deasserted. If Vdd ever drops below the threshold voltage
a reset is asserted immediately. In addition to a supply monitoring function the TS823/824/825 also monitor transitions
at the watchdog (WDI) input. If a logic transition does not occur at the WDI pin within a certain time interval (the
“watchdog” interval) then a reset is asserted. The reset deasserts after the reset interval, as explained earlier.
The TS823/824/825 can both assert a reset manually by pulling the MR input to ground, and the micro-power
quiescent current make this family a natural for portable battery powered equipment.
Features
Ordering Information
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Precision monitoring of +3V, +3.3V and +5V power
Part No.
Package
Packing
supply voltage
TS823CX5x RF
TS824CX5x RF
TS825CX5x RF
SOT-25
SOT-25
SOT-25
3Kpcs / 7” Reel
3Kpcs / 7” Reel
3Kpcs / 7” Reel
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Tight voltage threshold tolerance +/-1.5%
Fully specified over temperature
210mS min. power-on reset pulse width
3uA(typ) supply current
Note: x is the threshold voltage type, option as
A : 4.63V
F : 2.63V
B : 4.38V D : 3.08V E : 2.93V
G : 2.32V H : 2.19V
Guaranteed reset valid to Vdd = +1V
Power supply transient immunity
No external components
Contact factory for additional voltage option
Pin Descriptions
Applications
Function
RESET (Active-Low)
Ground
TS823 TS824 TS825
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Computers and Controllers
1
2
3
-
1
2
-
1
2
4
3
-
Embedded Controllers
Intelligent instruments
Manual Reset
Critical uP monitoring
(RESET) (Active-High)
Watchdog Input
Supply Voltage (Vdd)
3
4
5
Portable / Battery powered equipment
Automotive Systems
4
5
5
Absolute Maximum Rating
Parameter
Symbol
Vdd
Maximum
6.0
Unit
V
Supply Voltage
Supply Voltage - Recommended
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance
Vdd
0.9 ~ 5
-40 ~ +125
-65 ~ +150
256
V
oC
oC
oC/W
TOP
TSTG
Θjc
Maximum Lead Temperature (260oC)
TLEAD
10
S
Notes: Stress above the listed absolute rating may cause permanent damage to the device.
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Version: B07