PT7M823/824/825
μP Supervisor Circuits
Description
The PT7M823/824/825 family micro-processor (µP) supervisory
circuits are targeted to improve reliability and accuracy of power-
supply circuitry in µP’s systems. These devices reduce the complexity
and number of components required to monitor power-supply and
battery functions.
Pin Assignments
(Top View)
RESET
GND
MR
1
2
3
5
V
CC
NEW PRODUCT
The main functions are:
1. Asserting reset output during power-up, power-down and
brownout conditions for µP system.
2. Watchdog functions
3. Manual reset
4
WDI
SOT25/SOT353 (PT7M823)
(Top View)
Features
Precision Supply-Voltage Monitor
4.63V (PT7M82xL)
4.38V (PT7M82xM)
3.08V (PT7M82xT)
2.93V (PT7M82xS)
2.63V (PT7M82xR)
2.32V (PT7M82xZ)
2.19V (PT7M82xY)
200ms Reset Pulse Width
Debounced CMOS-Compatible Manual-Reset Input
(PT7M823/825)
Reset Output Signal for Watchdog and Power Abnormal, Manual
Reset
Reset Push-Pull Output
Voltage Monitor for Power-Fail or Low Battery Warning
Guaranteed
RESET
/RESET Valid at V
CC
= 1V
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
RESET
GND
RESET
1
2
3
5
V
CC
4
WDI
SOT25/SOT353 (PT7M824)
(Top View)
RESET
GND
RESET
1
2
3
5
V
CC
4
MR
Applications
Power-Supply Circuitry in µP Systems
Networking
Security System
Server/Storage
Embedded System
SOT25/SOT353 (PT7M825)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
PT7M823/824/825
Document number: DS41926 Rev. 1 - 2
1 of 14
www.diodes.com
May 2019
© Diodes Incorporated
PT7M823/824/825
Typical Applications Circuit
V
CC
V
CC
V
CC
RESET
WDI
MR
GND
μP
RESET
I/O Line
NEW PRODUCT
μP
Supervisory
circuit
Application Circuit of PT7M823
V
CC
V
CC
V
CC
RESET
WDI
GND
RESET
RESET
I/O Line
RESET
μP
μP
Supervisory
circuit
Application Circuit of PT7M824
V
CC
V
CC
V
CC
RESET
RESET
MR
GND
μP
RESET
RESET
μP
Supervisory
circuit
Application Circuit of PT7M825
PT7M823/824/825
Document number: DS41926 Rev. 1 - 2
2 of 14
www.diodes.com
May 2019
© Diodes Incorporated
PT7M823/824/825
Function Comparison Table
Part Number
PT7M823
PT7M824
PT7M825
RESET
Output
(Push-Pull)
RESET Output
(Push-Pull)
—
Manual Reset
Input
—
Watchdog Input
—
NEW PRODUCT
Pin Descriptions
Pin Number
PT7M823
SOT25/
SOT353
1
PT7M824
SOT25/
SOT353
1
PT7M825
SOT25/
SOT353
1
O
—
I
Active-Low Reset Output:
It goes low when V
CC
is below the
reset threshold. It remains low for about 200ms after one of
following occurs: V
CC
rises above the reset threshold (V
RST
), the
watchdog triggers a reset or
MR
goes from low to high
.
Ground Reference
for all signals.
Manual-Reset:
Active low. Pull low to force a reset. Reset
remains asserted for the duration of the Reset Timeout Period
after
MR
transitions from low to high. Leave unconnected or
connected to V
CC
if not used.
Pin Name
Type
Description
RESET
2
3
2
—
2
4
GND
MR
4
4
—
WDI
I
5
5
5
V
CC
—
Watchdog Input:
If WDI remains high or low for the duration of
the watchdog timeout period (t
WD
), the internal watchdog timer
trigger a reset output. Floating WDI or connecting WDI to a high-
impedance three-state buffer disables the watchdog feature. The
internal watchdog timer clears whenever reset is asserted or
WDI occurs a rising or falling edge.
Supply Voltage.
Reset is asserted when V
CC
drops below the
Reset Threshold Voltage (V
RST
). Reset remains asserted until
V
CC
rises above V
RST
and keeps asserted for the duration of the
Reset Timeout Period (t
RS
) once V
CC
rises above V
RST
.
Active High Reset Output. The inverse of
RESET
.
Whenever
RESET
is high, RESET is low.
—
3
3
RESET
O
PT7M823/824/825
Document number: DS41926 Rev. 1 - 2
3 of 14
www.diodes.com
May 2019
© Diodes Incorporated
PT7M823/824/825
Functional Block Diagram
WDI
4(4)
Watchdog
Transition Detector
V
CC
Watchdog
Timer
NEW PRODUCT
Timebase for
Reset&Watchdog
3[4]
MR
1(1)[1]
Reset Generator
V
CC
5(5)[5]
(3)[3]
RESET
RESET
V
RST
2(2)[2]
GND
A(B)[C]
A for PT7M823
B for PT7M824
C for PT7M825
Maximum Ratings
(Note 4)
Parameter
Supply Voltage to Ground Potential (V
CC
to GND)
DC Input Voltage (All Inputs Except V
CC
and GND)
DC Output Current (All Output)
Power Dissipation (Depend on Package)
Ambient Temperature with Power Applied
Storage Temperature Range
Note:
Rating
-0.3 to +6.0
-0.3 to V
CC
+ 0.3
20
320
-40 to +85
-65 to +150
Unit
V
V
mA
mW
°
C
°
C
4. Stresses greater than those listed under
Maximum Ratings
can cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect reliability.
ESD Ratings
Symbol
ESD HBM
ESD CDM
Parameter
Human Body Model ESD Protection
Charged Device Model ESD Protection
Rating
5
1
Unit
kV
kV
Recommended Operating Conditions
(@T
A
= +25° unless otherwise specified.)
C,
Symbol
V
CC
T
A
Parameter
Supply Voltage for PT7M82xL/M
Supply Voltage for PT7M82xT/S
Supply Voltage for PT7M82xR/Z/Y
Operating Temperature Range
Min
4.5
3.0
2.7
-40
Typ
5.0
3.3
3.0
—
Max
5.5
5.5
5.5
+85
Unit
V
V
V
°
C
PT7M823/824/825
Document number: DS41926 Rev. 1 - 2
4 of 14
www.diodes.com
May 2019
© Diodes Incorporated
PT7M823/824/825
DC Electrical Characteristics
(V
CC
= V
RN
+ 5% to 5.5V, T
A
= -40 to +85° unless otherwise noted.) (Note 5)
C,
Symbol
V
CC
I
CC
V
IH
V
IL
V
RST
Description
Operating Voltage Range
Supply Current
Input High Voltage
Input Low Voltage
Reset Threshold Voltage (Note 6)
Reset Threshold Hysteresis (Note 6)
—
V
CC
= 5V, No Load
MR
, WDI
MR
, WDI
Test Conditions
Min
1.0
—
0.7V
CC
—
V
RN
- 1.0%
V
RN
- 2.0%
—
V
CC
- 1.5
0.8
V
CC
0.8
V
CC
—
—
—
—
—
—
—
-20
—
35
Typ
—
10
—
—
V
RN
V
RN
0.80
—
—
—
—
—
—
—
—
—
—
-15
120
52
Max
5.5
36
—
0.3V
CC
V
RN
+ 1.0%
V
RN
+ 2.0%
—
—
—
—
0.4
0.3
0.3
0.4
0.3
800
Unit
V
µA
V
V
V
%V
RN
T
A
= +25°
C
T
A
= -40° to +85°
C
C
—
PT7M823/824/825L/M, V
CC
= V
RST(MAX)
,
I
SOURCE
= 120µA
PT7M823/824/825T/S/R/Z/Y,
V
CC
= V
RST(MAX)
, I
SOURCE
= 30µA
V
CC
>1.8V, I
SOURCE
= 150µA
PT7M823/824/825L/M, V
CC
= V
RST(MIN)
,
I
SINK
= 3.2mA
PT7M823/824/825T/S/R/Z/Y,
V
CC
= V
RST(MIN)
, I
SINK
= 1.2mA
V
CC
= 1.2V, I
SINK
= 100µA
PT7M823/824/825L/M, V
CC
= V
RST(MAX)
,
I
SINK
= 3.2mA
PT7M823/824/825T/S/R/Z/Y,
V
CC
= V
RST(MAX)
, I
SINK
= 1.2mA
PT7M823/824/825L/M,
RESET
= 0V,
V
CC
= 5.5V
NEW PRODUCT
V
HYS
V
OH
RESET
Output High Voltage
V
RESET Output High Voltage
RESET
Output Low Voltage
V
OL
RESET Output Low Voltage
V
I
SOURCE
RESET
Output Short Circuit Current
PT7M823/824/825T/S/R/Z/Y,
RESET
= 0V, V
CC
= 5.5V
µA
400
—
160
75
µA
kΩ
I
WDI
R
MR
Notes:
WDI Input Current (Note 7)
MR
Pull-Up Resistor
WDI = 0, time average
WDI = V
CC
, time average
PT7M823/825
5. Parameters of room temperature guaranteed by production test and parameters of full-temperature guaranteed by design.
6. Valid for both
RESET
and RESET. V
RST
(V
RTH
-) is the Reset threshold voltage when V
CC
from high to low level, and V
RTH
+ is the Reset threshold
voltage when V
CC
from low to high level. V
RN
is nominal reset threshold voltage.
7. WDI is internally serviced within the watchdog period if WDI is left unconnected.
AC Electrical Characteristics
Symbol
t
RS
t
WD
t
MR
—
t
MD
t
WP
—
Description
Reset Pulse Width
Watchdog Timeout Period
MR
Pulse Width
Test Conditions
—
—
—
Min
140
1.12
1.0
—
—
50
—
Typ
200
1.6
—
100
500
—
20
Max
280
2.25
—
—
—
—
—
Unit
ms
s
µs
ns
ns
ns
µs
MR
Noise Immunity (Pulse Width With —
No Reset)
MR
to RESET Delay
—
—
V
RST
- V
CC
= 100mV
WDI Pulse Width
V
CC
to RESET Delay
PT7M823/824/825
Document number: DS41926 Rev. 1 - 2
5 of 14
www.diodes.com
May 2019
© Diodes Incorporated
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