3 PIN MICROPROCESSOR RESET MONITORS
FSP2200
FEATURES
Precision VCC Monitor for 2.5 V, 3.0V, 3.3 V, and
5.0 V Supplies
Fully Specified Over Temperature
Available in Three Output Configurations
Push-Pull RESET Output
140ms min Power-On Reset Pulse Width
12µA Supply Current
Guaranteed Reset Valid to Vcc=+1V
Power Supply Transient Immunity
No External Components
SOT323-3L and SOT23-3L Packages
GENERAL DESCRIPTION
The FSP2200 is a microprocessor supervisory circuits
used to monitor the power supplies in MPU and digital
systems. They provide excellent circuit reliability and
low cost by eliminating external components and
adjustments when used with +5V, +3.3V, +3.0V, or
+2.5V powered circuits
These curcuits perform a single function: they assert a
reset signal whenever the Vcc supply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after Vcc has risen above the reset
threshold. Reset thresholds suitable for operation whit
a variety of supply voltages are available. The
FSP2200 have push-pull outputs, an active-low
RESET output. The reset comparator is designed to
ignore fast transients on Vcc, and the outputs are
guaranteed to be in the correct logic state for Vcc down
to 1V. Low supply current makes the FSP2200 ideal for
use in portable equipment. The FSP2200 are available
in SOT323-3L or SOT23-3L packages.
APPLICATIONS
Computers
Controllers
Intelligent Instruments
Critical MPU and MPU Power Monitoring
Portable/Battery-Powered Equipment
Automotive
PIN CONFIGURATION
(Top View)
GND 1
3
RESET 2
VCC
Pin
1
2
3
Name
GND
RESET
VCC
Function
Ground reference
Active-low output. RESET remains low while VCC is below the reset threshold,
and for a reset timeout period after VCC rises above the reset threshold.
Supply voltage (typ.)
TYPICAL OPERATION CIRCUIT
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3 PIN MICROPROCESSOR RESET MONITORS
FSP2200
ABSOLUTE MAXIMUM RATINGS
Parameter
Terminal Voltage
(with respect to GND)
Output Current, RESET
Rate of Rise, V
CC
Continuous Power Dissipation(TA=70°C)
SOT323-3L
SOT23-3L
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Seconds)
SOT323-3L
SOT23-3L
Tstg
T
L
Symbol
V
CC
V
RESET
(push-pull)
V
RESET
(push-drain)
Value
-0.3 to 6.0
-0.3 to (V
CC
+ 0.3)
-0.3 to 6.0
20
100
174
320
-40 to +125
-40 to +105
-65 to +150
300
mA
V/µs
mW
°C
°C
°C
Unit
V
ELECTRICAL CHARACTERISTICS
(Vcc=full range, T
A
= -40°C to +105°C(SOT23) or T
A
= -40°C to +125°C(SOT323)unless otherwise noted.)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
TA=0°C to +70
1.0
5.5
Vcc Range
TA=-40°C to +105°C(SOT23)
1.2
5.5
TA=-40°C to +125°C(SOT323)
1.2
5.5
24
60
VCC＜5.5V,FSP2200-4.63/4.38
TA=-40°C
VC＜3.6V,
to +85°C
17
50
Supply
FSP2200-2.32/2.63/2.93/3.08
ICC
Current(SOT23)
100
VCC＜5.5V,FSP2200-4.63/4.38
TA=+85°C
VCC＜3.6V,
to +105°C
100
FSP2200-2.32/2.63/2.93/3.08
24
35
VCC＜5.5V,FSP2200-4.63/4.38
TA=-40°C
VCC＜3.6V,
to +85°C
17
30
FSP2200-2.32/2.63/2.93/3.08
Supply
ICC
Current(SOT323)
60
VCC＜5.5V,FSP2200-4.63/4.38
TA=+85°C
VCC＜3.6V,
to +125°C
60
FSP2200-2.32/2.63/2.93/3.08
TA=+25°C
4.56
4.63
4.70
FSP2200-
TA=-40°C to +85°C
4.50
4.75
4.63
TA=-40°C to +105°C
4.40
4.86
TA=+25°C
4.31
4.38
4.45
FSP2200-
TA=-40°C to +85°C
4.25
4.50
4.38
TA=-40°C to +105°C
4.16
4.56
TA=+25°C
3.93
4.00
4.06
FSP2200-
TA=-40°C to +85°C
3.89
4.10
4.00
TA=-40°C to +105°C
3.80
4.20
Reset Threshold
V
TH
(SOT23)
TA=+25°C
3.04
3.08
3.11
FSP2200-
TA=-40°C to +85°C
3.00
3.15
3.08
TA=-40°C to +105°C
2.92
3.23
TA=+25°C
2.89
2.93
2.96
FSP2200-
TA=-40°C to +85°C
2.85
3.00
2.93
TA=-40°C to +105°C
2.78
3.08
TA=+25°C
2.59
2.63
2.66
FSP2200-
TA=-40°C to +85°C
2.55
2.70
2.63
TA=-40°C to +105°C
2.50
2.76
Unit
V
μA
V
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3 PIN MICROPROCESSOR RESET MONITORS
FSP2200
ELECTRICAL CHARACTERISTICS
(CONTINUED)
(Vcc=full range, T
A
= -40°C to +105°C(SOT23) or T
A
= -40°C to +125°C(SOT323)unless otherwise noted.)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
TA=+25°C
4.56
4.63
4.70
FSP2200-
TA=-40°C to +85°C
4.50
4.75
4.63
TA=-40°C to +125°C
4.44
4.82
TA=+25°C
4.31
4.38
4.45
FSP2200-
TA=-40°C to +85°C
4.25
4.50
4.38
TA=-40°C to +125°C
4.20
4.56
TA=+25°C
3.04
3.08
3.11
FSP2200-
TA=-40°C to +85°C
3.00
3.15
3.08
Reset Threshold
TA=-40°C to +125°C
2.95
3.21
V
V
TH
(SOT323)
TA=+25°C
2.89
2.93
2.96
FSP2200-
TA=-40°C to +85°C
2.85
3.00
2.93
TA=-40°C to +125°C
2.81
3.05
TA=+25°C
2.59
2.63
2.66
FSP2200-
TA=-40°C to +85°C
2.55
2.70
2.63
TA=-40°C to +125°C
2.52
2.74
TA=+25°C
2.28
2.32
2.35
FSP2200-
TA=-40°C to +85°C
2.25
2.38
2.32
TA=-40°C to +125°C
2.22
2.42
Reset Threshold
30
ppm/°C
Tempco
Vcc to Reset
Vcc= V
TH
to (V
TH
-100mV)
20
μs
Delay
Reset Active
TA=-40°C to +85°C
140
240
560
Timeout
TA=-40°C to +105°C
100
840
Period(SOT23)
ms
Reset Active
TA=-40°C to +85°C
140
240
460
Timeout
TA=-40°C to +125°C
100
840
Period(SOT323)
Vcc=V
TH
min, I
SINK
=1.2mA
0.3
RESET Output
FSP2200-2.32/2.63/2.93/3.08
Voltage Low
Vcc=V
TH
min, I
SINK
=3.2mA
V
OL
0.4
(push-pull active
FSP2200-4.00/4.38/4.63
V
low)
0.3
Vcc＞1.0V, I
SINK
=50µA
Vcc＞V
TH
max, I
SOURCE
=500µA
FSP2200-2.32/2.63/2.93/3.08
V
OH
Vcc＞V
TH
max, I
SOURCE
=80µA
FSP2200-4.00/4.38/4.63
Typical Values: TA=-+25°C Vcc=5V for FSP2200-4.00/4.38/4.63
Vcc=3.3V for FSP2200-3.08/2.93
Vcc=3V for FSP2200-2.63
Vcc=2.5V for FSP2200-2.32
RESET Output
Voltage High
(push-pull active
low)
0.8Vcc
V
Vcc-1.5
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3 PIN MICROPROCESSOR RESET MONITORS
FSP2200
DETAILED DESCRIPTION
A microprocessor's (MPU) reset input starts the MPU in a known state. The FSP2200 reset to prevent code
execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the
Vcc supply voltage declines below a preset thresh-old, keeping it asserted for at least 140ms after Vcc has risen
above the reset threshold. The FSP2200 push-pull output stage.
APPLICATION INFORMATION
Negative-Going V
CC
Transients
In addition to issuing a reset to the MPU during power-up, power-down, and brownout conditions, the FSP2200 is
relatively immune to short-duration negative-going Vcc transients (glitches). Figure 1 shows typical transient
duration vs. reset comparator overdrive, for which the FSP2200 do not generate a reset pulse. The graph was
generated using a negative going pulse applied to Vcc, starting 0.5V above the actual reset threshold and ending
below it by the magnitude in dicated (reset comparator overdrive). The graph indicates the maximum pulse width a
negative-going Vcc transient can have without causing a reset pulse. As the magnitude of the transient increases
(goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, for the
FSP2200-4.63/4.38, a Vcc transient that goes 100mV below the reset threshold and lasts 20µs or less will not cause
a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient
immunity.
400
320
240
160
80
0
1
10
100
1000
Reset Comparator Overdrive, V
TH
-Vcc
Figure 1
Figure 2
Ensuring a Valid Reset Output: Down to VCC = 0
When VCC falls below 1V, the FSP2200 RESET output no longer sinks current-it becomes an open circuit.
Therefore, high-impedance CMOS logic input connected to RESET can drift to undetermined voltages. This
presents no problem in most applications since most MPU and other circuitry is inoperative with Vcc below 1V.
However, in applications where RESET must be valid down to 0V, adding a pull-down resistor to RESET causes any
stray leakage currents to flow to ground, holding RESET low Figure 2. R1's value is not critical, 100kΩ is large
enough not to load RESET and small enough to pull RESET to ground
Benefits of Highly Accurate Reset Threshold
Most MPU supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal supply
voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10%
below nominal.
When using ICs rated at only the nominal supply ±5%, this leaves a zone of uncertainty where the supply is between
5% and 10% low, and where the reset may or may not be asserted.
The FSP2200-4.63/3.08/2.32 use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below nominal.
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3 PIN MICROPROCESSOR RESET MONITORS
FSP2200
ORDERING INFORMATION
FSP2200XXXX
Packing:
Package:
C: SOT23-3L A:Tape & Reel
U: SOT323-3L
Temperature Grade:
L: -40~105℃
E: -40~125℃
Threshold Voltage:
Z: 2.32V
R: 2.63V
S: 2.93V
T: 3.08V
J: 4.00V
M: 4.38V
L: 4.63V
MARKING INFORMATION
09X
Threshold Voltage:
L: 4.63V
M: 4.38V
J: 4.00V
T: 3.08V
S: 2.93V
R: 2.63V
Z: 2.32V
Part Number: FSP2200
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2007-2-8
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