MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
IC for CMOS System Reset
Monolithic IC PST81XX, 82XX Series
Outline
This IC functions in a variety of CPU systems and other logic systems, to detect supply voltage and reset the
system accurately when the power is turned on or interrupted.
To ±1.5% of detection voltage accuracy of the conventional models, a maximum of ±0.5% of super-high
precision is realized, and it is more suitable for battery detection etc. Moreover, the mounting area
significantly contributes to space saving using the SSON package.
Features
1. Ultra-high accuracy VTH ±0.5%/2.0~6.0V
VTH ±0.8%/0.8~1.9V
2. Ultra-low current consumption 0.25µA typ.
3. Ultra-small package 1.10 1.40mm (SSON-4A)
4. Operating temperature range -40~+105°C
5. Detecting voltage rank 0.8~6.0V (0.1V step)
6. Output configuration PST81XX series ······ CMOS output
PST82XX series ······ Open drain output
Packages
SOT-25A
SC-82ABA
SC-82ABB
SSON-4A
Applications
1. Reset circuits for microcomputers, CPUs and MPUs
2. Reset circuits for logic circuits
3. Battery voltage check circuits
4. Back-up power supply switching circuits
5. Level detection circuits
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
Block Diagram
1
3
2
Vref
VDD
GND
OUT
PST81XXNX, PST81XXRX, PST81XXUX
(SOT-25A) (SSON-4A) (SC-82ABA/-82ABB)
1
3
2
Vref
VDD
GND
OUT
PST82XXNX, PST82XXRX, PST82XXUX
(SOT-25A) (SSON-4A) (SC-82ABA/-82ABB)
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
Pin Assignment
123
54
SOT-25A
(TOP VIEW)
12
43
SC-82ABA
SC-82ABB
(TOP VIEW)
12
43
SSON-4A
(TOP VIEW)
1OUT
2VDD
3GND
4N.C
5N.C
1OUT
2GND
3N.C
4VDD
1OUT
2VDD
3N.C
4GND
PST81XX, PST82XX
Pin Description
Pin No. Pin name Functions
1OUT Reset Signal Output Pin
2VDD
V
DD
Pin / Voltage Detect Pin
3GND GND Pin
4N.C No Connection
5N.C No Connection
PST81XXNX, PST82XXNX (SOT-25A)
Pin No. Pin name Functions
1OUT Reset Signal Output Pin
2GND GND Pin
3N.C No Connection
4VDD
V
DD
Pin / Voltage Detect Pin
PST81XXRX, PST82XXRX (SSON-4A)
Pin No. Pin name Functions
1OUT Reset Signal Output Pin
2VDD
V
DD
Pin / Voltage Detect Pin
3N.C No Connection
4GND GND Pin
PST81XXUX, PST82XXUX (SC-82ABA/-82ABB)
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
Absolute Maximum Ratings
Item Symbol Ratings Units
Supply voltage VDD max
-
0.3~+12.0 V
Output voltage OUT
-
0.3~(VDD+0.3) V
Input current (VDD)IDD 20 mA
Output current (RESET, RESET) IOUT 20 mA
Operating temperature TOPR
-
40~+105 °C
Storage temperature TSTG
-
65~+150 °C
PST81XX
Item Symbol Ratings Units
Supply voltage VDD max
-
0.3~+12.0 V
Output voltage OUT
-
0.3~+12.0 V
Input current (VDD)IDD 20 mA
Output current (RESET, RESET) IOUT 20 mA
Operating temperature TOPR
-
40~+105 °C
Storage temperature TSTG
-
65~+150 °C
PST82XX
Recommended Operating Conditions
Item Symbol Ratings Units
Operating temperature TOPR
-
40~+105 °C
Supply voltage VDD +0.7~+10.0 V
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
Electrical Characteristics (Except where noted otherwise Ta=25°C)
note1 : This device is tested at Ta=25°C, over temperature limits guaranteed by design only.
note2 : The parameter is guaranteed by design.
PST81XX
Item Symbol Measurement conditions Min. Typ. Max. Units Circuit
Supply current IDD VDD=VTH+1V 0.25 1.0 µA (1)
Ta=+25°C VTH <
= 1.9V
V
TH
-
0.8%
VTH
V
TH
+0.8%
Reset threshold VTH
Ta=-40~+85°C (note1)
V
TH
-
2.5%
0.8~
V
TH
+2.5%
V(2)
Ta=+25°C VTH >
= 2.0V
V
TH
v0.5%
6.0V
V
TH
+0.5%
Ta=
-
40~+85°C (note1)
V
TH
-
2.5% (0.1Vstep) V
TH
+2.5%
Reset threshold hysteresis
VTH VDD=0V VTH+1V 0V
V
TH
0.03 V
TH
0.08
V(2)
Reset threshold temp. coefficient
V
TH
/°C
Ta=
-
40~+85°C (note1) ±100
ppm/°C
(2)
L transfer delay time tPHL
V
DD
=V
TH
+0.4V V
TH
-
0.4V (note2)
100 µs (5)
H transfer delay time tPLH
V
DD
=V
TH
-
0.4V V
TH
+0.4V (note2)
100 µs (5)
IOL1 VDD=0.7V, VDS=0.05V 0.01 0.10
IOL2
VDD=1.2V, VDS=0.5V
VTH > 1.3V 0.23 2.00
"L" output curren IOL3
VDD=2.4V, VDS=0.5V mA (3)
VTH > 2.5V 1.60 8.00
IOL4
VDD=3.6V, VDS=0.5V 3.20 12.0
VTH > 3.7V
"H" output current IOH1
V
DD
=4.8V, V
DS
=0.5V, V
TH
< 4.7V
0.36 0.62 mA (4)
IOH2
V
DD
=6.1V, V
DS
=0.5V, V
TH
< 5.9V
0.46 0.75
note1 : This device is tested at Ta=25°C, over temperature limits guaranteed by design only.
note2 : The parameter is guaranteed by design.
PST82XX
Item Symbol Measurement conditions Min. Typ. Max. Units Circuit
Supply current IDD VDD=VTH+1V 0.25 1.0 µA (1)
Ta=+25°C VTH <
= 1.9V
V
TH
-
0.8%
VTH
V
TH
+0.8%
Reset threshold VTH
Ta=
-
40~+85°C (note1)
V
TH
-
2.5%
0.8~
V
TH
+2.5%
V(2)
Ta=+25°C VTH >
= 2.0V
V
TH
-
0.5%
6.0V
V
TH
+0.5%
Ta=
-
40~+85°C (note1)
V
TH
-
2.5% (0.1Vstep) V
TH
+2.5%
Reset threshold hysteresis
VTH VDD=0V VTH+1V 0V VTH 0.03
V
TH
0.08
V(2)
Reset threshold temp. coefficient
V
TH
/°C
Ta=
-
40~+85°C (note1) ±100
ppm/°C
(2)
L transfer delay time tPHL
V
DD
=V
TH
+0.4V V
TH
-
0.4V (note2)
100 µs (4)
H transfer delay time tPLH
V
DD
=V
TH
-
0.4V V
TH
+0.4V (note2)
100 µs (4)
IOL1 VDD=0.7V, VDS=0.05V 0.01 0.10
IOL2
VDD=1.2V, VDS=0.5V
VTH > 1.3V 0.23 2.00
"L" output curren IOL3
VDD=2.4V, VDS=0.5V mA (3)
VTH > 2.5V 1.60 8.00
IOL4
VDD=3.6V, VDS=0.5V
VTH > 3.7V 3.20 12.0
Output leakage current
Ireak VDD=10V, OUT=10V 0.1 µA (3)
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
Measuring Circuit
(1) IDD
PST81XX *1-3in the circuit diagram is pin number for the SOT-25A package.
PST
81XX
2VDD
GND
VIN
ISS
1
3
(2) VTH, VTH, VTH/°C
VDD
GND
VIN
OUT
PST
81XX
2
1
3
(3) IOL1, IOL2, IOL3, IOL4
VDD
GND
VIN
OUT
VDS
IOUT
PST
81XX
2
1
3
(4) IOH1, IOH2
VDD
GND
VIN
OUT
VDD-VDS
IOUT
PST
81XX
2
1
3
(5) tPLH, tPHL
VDD
GND
VIN
OUT
PST
81XX
2
1
3
VTH+0.4V
GND
100%
50%
GND
Input Voltage
Output Voltage
VTH+0.4V
VTH
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
(1) IDD
PST
82XX
2VDD
GND
VIN
ISS
1
3
(2) VTH, VTH, VTH/°C
470kΩ
VDD
GND
VIN
OUT
PST
82XX
2
1
3
(3) IOL1, IOL2, IOL3, IOL4, Ireak
VDD
GND
VIN
OUT
VDS
IOUT
PST
82XX
2
1
3
(4) tPLH, tPHL
470kΩ
VDD
GND
VIN
OUT
PST
82XX
2
1
3
VTH+0.4V
GND
100%
50%
GND
Input Voltage
Output Voltage
VTH+0.4V
VTH
PST81XX *1-3in the circuit diagram is pin number for the SOT-25A package.
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
Timing Chart
V
VDD
t
V
OUT
t
VTH
VTH
tPLH
VTH+ VTH
tPHL
Application Circuit
PST
81XX
Logic
System
2
1
3
Reset
OUT
VDD
GND
VDD
VIN
PST81XX
MITSUMI IC for CMOS System Reset PST81XX, 82XX Series
· We shall not be liable for any trouble or damage caused by using this circuit.
· In the event a problem which may affect industrial property or any other rights of us or a third party is
encountered during the use of information described in these circuit, Mitsumi Electric Co., Ltd. shall not be
liable for any such problem, nor grant a license therefore.
· Please note that there is any possibility of circuit oscillation when resistance put in the line VIN.
· Please do not put resistance for PST81XX.
· Recommend 15kΩor less for PST82XX.
PST
81XX
2
OUT
VDD
GND
VIN
1
3
PST
82XX
2
OUT
VDD
GND
VIN
1
3
PST
82XX
Logic
System
2
Reset
OUT
VDD
GND
VDD
VIN
1
3
PST82XX
