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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µ
P Supervisor Circuits
Discription
The PT7M7xxx family microprocessor (µP) supervisory
circuits are targeted to improve reliability and accuracy
of power-supply circuitry in
µP
systems. These devices
reduce the complexity and number of components
required to monitor power-supply and battery functions.
The main functions are:
1. Asserting reset output during power-up, power-down
and brownout conditions for
µP
system;
2. Detecting power failure or low-battery conditions with
a 1.25V threshold detector;
3. Watchdog functions;
4. Manual reset.
Features
• Precision supply-voltage monitor
- 4.63V (PT7M7xxxL)
- 4.38V (PT7M7xxxM)
- 3.08V (PT7M7xxxT)
- 2.93V (PT7M7xxxS)
- 2.63V (PT7M7xxxR)
- 2.32V (PT7M7xxxZ)
- 2.20V (PT7M7xxxY)
- 4.00V (PT7M7xxxJ)
• 200ms reset pulse width
• Debounced CMOS-compatible manual-reset input
(7811, 7812, 7823, 7825, 7342-7344)
• Reset Output Signal for Watchdog and Power
Abnormal, Manual Reset
• Reset Push-Pull output (PT7M7809,7811,7823,
7824,7825,7342,7345)
• Reset Open-Drain output (PT7M7803/7343)
• Voltage monitor for power-fail or low battery warning
• Guaranteed RESET/RESET valid at V
CC
= 1.0V
Applications
• Power-supply circuitry in
µP
systems
Ordering Information
No.
1
2
3
4
5
6
7
8
9
10
11
Part No
PT7M7803XT
PT7M7809XT
PT7M7810XT
PT7M7811XTA
PT7M7812XTA
PT7M7823XTA
PT7M7824XTA
PT7M7825XTA
PT7M7342XTA
PT7M7343XTA
PT7M7344XTA
Package
SOT23-3
No.
12
13
14
15
16
17
18
19
20
21
22
Part No
PT7M7345XTA
PT7M7811XTB
PT7M7812XTB
PT7M7803XDE
PT7M7809XDE
PT7M7810XDE
PT7M7811XDE
PT7M7812XDE
PT7M7823XDE
PT7M7824XDE
PT7M7825XDE
Package
SOT23-6
SOT143
SOT23-5
Die Form
SOT23-6
Note: lead free package is available by adding E at the end of each part no. For example: PT7M7803XTE for
SOT23-3 lead free package.
Suffix: X -- Monitored Voltage
Suffix X
L
Reset Threshold(V) 4.36
PT0109L(02/07)
M
4.38
T
3.08
1
S
2.93
R
2.63
Z
2.32
Y
2.20
J
4.00
Ver:11
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µ
P Supervisor Circuits
Power Fail
Detector
(1.25V)
-
-
-
-
-
-
-
-
Function Comparison
RESET output
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Part No.
PT7M7803XT
PT7M7809XT
PT7M7810XT
PT7M7811XTA
PT7M7812XTA
PT7M7823XTA
PT7M7824XTA
PT7M7825XTA
PT7M7342XTA
PT7M7343XTA
PT7M7344XTA
PT7M7345XTA
PT7M7811XTB
PT7M7811XTB
PT7M7803XDE
PT7M7809XDE
PT7M7810XDE
PT7M7811XDE
PT7M7812XDE
PT7M7823XDE
PT7M7824XDE
PT7M7825XDE
Push-Pull
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Open-Drain
RESET
output
(push-pull)
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Manual Reset
Input
-
-
-
Watchdog
Input
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Block Diagram
Block Diagram
WDI
Watchdog
Transition Detector
V cc
Watchdog Timer
Timebase for Reset
& Watchdog
MR
Reset Generator
Vcc
RESET
(RESET)
V
RST
PFI
1.25V
PFO
PT0109L(02/07)
2
Ver:11
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µ
P Supervisor Circuits
Marking Information
C od e
12
Descr ip t ion
Part Number
Year
Work Week
1
2
3
4
3
4
Part Number Code
Code 1 2
AA
AB
AC
AD
AE
AF
AG
AH
AI
AJ
AK
AL
AM
AN
AO
AP
AQ
AR
AS
AT
AU
AV
AW
AX
AY
AZ
BA
BB
Part No.
PT7M7809L
PT7M7809M
PT7M7809T
PT7M7809S
PT7M7809R
PT7M7809Z
PT7M7809Y
PT7M7810L
PT7M7810M
PT7M7810T
PT7M7810S
PT7M7810R
PT7M7810Z
PT7M7810Y
PT7M7811L
PT7M7811M
PT7M7811T
PT7M7811S
PT7M7811R
PT7M7811Z
PT7M7811Y
PT7M7812L
PT7M7812M
PT7M7812T
PT7M7812S
PT7M7812R
PT7M7812Z
PT7M7812Y
Code 1 2
BC
BD
BE
BF
BG
BH
BI
BJ
BK
BL
BM
BN
BO
BP
BQ
BR
BS
BT
BU
BV
BW
BX
BY
BZ
CA
CB
CC
CD
Part No.
PT7M7803L
PT7M7803M
PT7M7803T
PT7M7803S
PT7M7803R
PT7M7803Z
PT7M7803Y
PT7M7823L
PT7M7823M
PT7M7823T
PT7M7823S
PT7M7823R
PT7M7823Z
PT7M7823Y
PT7M7824L
PT7M7824M
PT7M7824T
PT7M7824S
PT7M7824R
PT7M7824Z
PT7M7824Y
PT7M7825L
PT7M7825M
PT7M7825T
PT7M7825S
PT7M7825R
PT7M7825Z
PT7M7825Y
Code 1 2
CE
CF
CG
CH
CI
CJ
CK
CL
CM
CN
CO
CP
CQ
CR
CS
CT
CU
CV
CW
CX
CY
CZ
DA
DB
DC
DD
DE
DF
Part No.
PT7M7342L
PT7M7342M
PT7M7342T
PT7M7342S
PT7M7342R
PT7M7342Z
PT7M7342Y
PT7M7343L
PT7M7343M
PT7M7343T
PT7M7343S
PT7M7343R
PT7M7343Z
PT7M7343Y
PT7M7344L
PT7M7344M
PT7M7344T
PT7M7344S
PT7M7344R
PT7M7344Z
PT7M7344Y
PT7M7345L
PT7M7345M
PT7M7345T
PT7M7345S
PT7M7345R
PT7M7345Z
PT7M7345Y
Note: lead free package is available by adding line above the first code. For example: Part Number code of PT7M7809LE is AA.
PT0109L(02/07)
3
Ver:11
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µ
P Supervisor Circuits
Pin Information
Pin Configuration
SOT23-3
PT7M7803
PT7M7809
1
GND
1
SOT143
PT7M7810
GND
1
PT7M7811
GND
VCC
4
1
PT7M7812
GND
VCC
4
VCC
3
VCC
3
2
RESET
2
RESET
2
RESET
MR
3
2
RESET
MR
3
SOT23-5
PT7M7811
1
GND
VCC
5
1
PT7M7812
GND
VCC
5
2
NC
2
NC
3
RESET
MR
4
3
RESET
MR
4
PT7M7823
1
RESET
VCC
5
1
PT7M7824
RESET
VCC
5
PT7M7825
1
RESET
VCC
5
2
GND
2
GND
2
GND
3
MR
WDI
4
3
RESET
WDI
4
3
RESET
MR
4
SOT23-6
PT7M7342
PT7M7343
1
VCC
RESET
6
1
PT7M7344
VCC
RESET
6
1
PT7M7345
VCC
RESET
6
2
GND
MR
5
2
GND
MR
5
2
GND
RESET
5
3
PFI
PFO
4
3
PFI
PFO
4
3
PFI
PFO
4
PT0109L(02/07)
4
Ver:11
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µ
P Supervisor Circuits
Pin Description
Pin Na me
MR
Type
I
De s cr ipt ion
M a nua l-R e s e t : (CM OS). 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
VCC if not used.
Powe r Supply: 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 keep asserted for the duration of the Reset Timeout Period (t
RS
)
once V
CC
rises above V
RST
.
Gr ound R e fe r e nce for all signals
Powe r-Fa il Volt a ge M onit or I nput . When PFI <V
PFT
, PFO goes low. Connect PFI to GND or Vcc
when not used.
Powe r-Fa il Out put : it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays
high.
Wa t chdog I nput (CM OS). 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.
Act ive -Low R e s e t O ut put (Pus h-Pull or O pe n-D r a in). It goes low when Vcc is below the reset
threshold. It remains low for about 200ms after one of the following occurs: Vcc rises above the reset
threshold (V
RST
), the watchdog triggers a reset, or MR goes from low to high.
The inve r s e of R ESE T, active high. Whenever RESET is high, RESET is low.
No conne ct ion
Vcc
GND
PFI
PFO
Power
Ground
I
O
WDI
I
RESET
RESET
NC
O
O
-
PT0109L(02/07)
5
Ver:11
