This is a reset IC with In various CPU systems or other logic systems, when the time of a power supply injection and a
power supply are severed for a moment, this IC detects supply voltage and applies reset to a system.
PST85 has separated the detecting voltage monitor terminal (VS) and the VDD terminal. Even if monitor voltage VS
falls, when an operating limit is reached for another power supply, an output does not become unfixed, and the power
supply of IC can maintain low level. It is especially suitable for the power supply surveillance of the low power supply (1V
system).
Features
1. High Accuracy
2.
3.
4.
5.
6.
Super low supply current
Operating-voltage range
Operating-temperature range
Detecting voltage rank
Output type
Typ±0.8% (VTH=0.8~1.9V)
Typ±0.5% (VTH=2.0~6.0V)
Typ 0.35µA
0.70V~10V
-40~+105°C
1.2V~6.0V (0.1Vstep)
CMOS output (PST851)
Open drain output (PST852)
Packages
SSON-4
SC-82ABB
SOT-25A
Applications
1.
2.
3.
4.
5.
Reset circuits for CPUs and MPUs
Reset circuits for logic circuits
Battery voltage check circuits
Change circuit of a backup circuit
Level detector
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset IC PST85XX Series
Block Diagram
VS
VDD
RA
RD
OUT
RB
Vref
GND
RC
: Protection Circuit
Pin Assignment
4
3
1
2
3
4
1
2
GND
OUT
VS
VDD
4
3
1
2
1
2
3
4
GND
VDD
VS
OUT
SSON-4
(TOP VIEW)
SC-82ABB
(TOP VIEW)
5
4
1
2
3
1
2
3
4
5
OUT
VDD
GND
NC
VS
SOT-25A
(TOP VIEW)
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset IC PST85XX Series
Pin Description
SSON-4
Pin No.
1
2
3
4
Pin name
GND
OUT
VS
V
DD
GND Pin
Reset Signal Output Pin
Sence Pin
V
DD
Pin
Functions
SC-82ABB
Pin No.
1
2
3
4
Pin name
GND
V
DD
VS
OUT
GND Pin
V
DD
Pin
Sence Pin
Reset Signal Output Pin
Functions
SOT-25A
Pin No.
1
2
3
4
5
Pin name
OUT
V
DD
GND
NC
VS
V
DD
Pin
GND Pin
No Connection
Sence Pin
Functions
Reset Signal Output Pin
Absolute Maximum Ratings
Item
Supply voltage
Output voltage
Output voltage
Input current (V
DD
)
Output current (RESET, RESET)
Power dissipation
Operating temperature
Storage temperature
Symbol
VDD max.
OUT
VS
I
DD
I
OUT
SSON-4
P
D
T
OPR
T
STG
SC-82ABB
SOT-25A
- 40~+105
- 65~+150
PST851
PST852
20
20
330 (Note1)
150
150
°C
°C
mW
Ratings
- 0.3~+12.0
- 0.3~(VDD+0.3)
- 0.3~+12.0
- 0.3~+12.0
Units
V
V
V
mA
mA
Note1 : With PC board of glass epoxy. (The tab pin is not connected with PC board.)
PC board size of 110×40×0.8mm
Recommended Operating Conditions
Item
Operating temperature
Supply voltage
Symbol
T
OPR
VDD
Ratings
- 40~+105
+0.70~+10.0
Units
°C
V
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset IC PST85XX Series
Model Name
P
S
T
8
5
a
a
Output Type
1
2
Push
Pull
Open
Drain
A
b
Dalay Pin
No
c
VDET Rank
080
~
V
TH
=0.80V
~
R
U
N
A
b
d
Packge
SSON-4B
SC-82ABB
SOT-25A
R
L
M
H
c
U
d
e
e
Packing Specifications
R HOUSING
Halogen-contained Product
L HOUSING
Halogen-contained Product
R HOUSING
Halogen-free Product
L HOUSING
Halogen-free Product
600
V
TH
=6.00V
note1 : This device is tested at Ta=25°C, over temperature limits guaranteed by design only.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
System Reset IC PST85XX Series
Electrical Characteristics
Item
Symbol
(Except where noted otherwise Ta=25°C)
Rank
0.8V
0.9V
1.0V
1.1V
1.2V
1.3V
1.4V
1.5V
1.6V
1.7V
1.8V
Min.
0.7936
0.7800
0.8928
0.8775
0.9920
0.9750
1.0912
1.0725
1.1904
1.1700
1.2896
1.2675
1.3888
1.3650
1.4880
1.4625
1.5872
1.5600
1.6864
1.6575
1.7856
1.7550
1.8848
1.8525
1.9900
1.9500
2.0895
2.0475
2.1890
2.1450
2.2885
2.2425
2.3880
2.3400
2.4875
2.4375
2.5870
2.5350
2.6865
2.6325
2.7860
2.7300
2.8855
2.8275
2.9850
2.9250
Typ.
0.8000
0.9000
1.0000
1.1000
1.2000
1.3000
1.4000
1.5000
1.6000
1.7000
1.8000
1.9000
2.0000
2.1000
2.2000
2.3000
2.4000
2.5000
2.6000
2.7000
2.8000
2.9000
3.0000
Max.
0.8064
0.8200
0.9072
0.9225
1.0080
1.0250
1.1088
1.1275
1.2096
1.2300
1.3104
1.3325
1.4112
1.4350
1.5120
1.5375
1.6128
1.6400
1.7136
1.7425
1.8144
1.8450
1.9152
1.9475
2.0100
2.0500
2.1105
2.1525
2.2110
2.2550
2.3115
2.3575
2.4120
2.4600
2.5125
2.5625
2.6130
2.6650
2.7135
2.7675
2.8140
2.8700
2.9145
2.9725
3.0150
3.0750
Units
Circuit
Measurement conditions
Reset threshold
V
TH
VDD=V
TH
+1V
Ta=+25°C
Ta=−40~+85°C
1.9V
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.9V
3.0V
V
2
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
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