PT7A7611-7615/7621-7625/7631-7635
μP Supervisor Circuits
Description
The PT7A7611-7615/7621-7625/7631-7635 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)
MR
V
CC
GND
(Top View)
WDO
RESET
WDI
PFO
RESET
WDO
MR
V
CC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
WDI
PFO
PFI
GND
NEW PRODUCT
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 (not for PT7A7631-7635).
PFI
SO-8
PT7A7611-7615
(Top View)
MR
V
CC
MSOP-8
(Top View)
WDO
RESET
WDI
PFO
RESET
WDO
MR
V
CC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
WDI
PFO
PFI
GND
Features
Precision Supply-voltage Monitor
4.63V (PT7A7611/7621/7631)
4.38V (PT7A7612/7622/7632)
3.08V (PT7A7613/7623/7633)
2.93V (PT7A7614/7624/7634)
2.63V (PT7A7615/7625/7635)
200ms Reset Pulse Width
Debounced TTL/CMOS-compatible Manual-reset Input
Independent Watchdog Timer 1.6sec Time-out (Not Available for
PT7A7631-7635)
Voltage Monitor for Power-fail or Low Battery Warning
Reset Output Signal:
Active-low Only (PT7A7611-7615)
Active-high Only (PT7A7621-7625)
Active-high and Active-low (PT7A7631-7635)
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)
GND
PFI
SO-8
PT7A7621-7625
(Top View)
MR
V
CC
GND
PFI
MSOP-8
(Top View)
RESET
RESET
NC
PFO
RESET
RESET
MR
V
CC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
NC
PFO
PFI
GND
SO-8
PT7A7631-7635
MSOP-8
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery Powered Equipment
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.
PT7A7611-7615/7621-7625/7631-7635
Document number: DS41672 Rev. 1 - 2
1 of 14
www.diodes.com
January 2019
© Diodes Incorporated
PT7A7611-7615/7621-7625/7631-7635
Typical Applications Circuit
IN
DC Linear
Regulator
μP
V
CC
V
CC
RESET
WDI
WDO
PFO
RESET
I/O Line
NMI
Interrupt
NEW PRODUCT
PFI
MR
μP
Supervisory
circuit
Figure 1. Typical Application Diagram
Pin Descriptions
Pin Number
PT7A7611-7615
SO-8
1
2
3
4
5
MSOP-8
3
4
5
6
7
PT7A7621-7625
SO-8
1
2
3
4
5
MSOP-8
3
4
5
6
7
PT7A7631-7635
SO-8
1
2
3
4
5
MSOP-8
3
4
5
6
7
Manual-Reset:
triggers a reset pulse when pulled below 0.8V,
active low. It has an internal 250µA pull-up current and be driven
from a TTL or CMOS logic line as well as shorted to ground with a
switch.
Supply Voltage.
Ground Reference
for all signals.
Power-Fail Voltage Monitor Input.
When PFI is less than 1.25V,
PFO
goes low. Connect PFI to GND or V
CC
when not used.
Power-Fail Output:
it gets low and sinks current when PFI is less
than 1.25V; otherwise
PFO
stays high.
Watchdog Input:
If WDI remains high or low for 1.6sec, the
internal watchdog timer runs out and
WDO
goes low. 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. WDI is three-stated, or WDI sees a
rising or falling edge.
Not Connected.
Reset Output pulses:
low for 200ms when triggered, and stays
low whenever V
CC
is below the reset threshold. It remains low for
200ms after V
CC
rises above the reset threshold or
MR
goes from
low to high. A watchdog timeout will not trigger
RESET
unless
Pin Name
Description
MR
V
CC
GND
PFI
PFO
6
8
6
8
—
—
WDI
—
—
—
—
6
8
NC
7
1
—
—
7
1
RESET
WDO
is connected to
MR
.
Watchdog Output:
pulls low when the internal watchdog timer
finishes its 1.6sec count and does not go high again until the
watchdog is cleared.
WDO
also goes low during low-line
8
2
8
2
—
—
WDO
conditions. Whenever V
CC
is below the reset threshold,
WDO
stays low; however, unlike
RESET
,
WDO
does not have
minimum pulse width. As soon as V
CC
rises above the reset
threshold,
WDO
goes high with no delay.
The inverse of
RESET
, active high. Whenever
RESET
is high,
RESET is low.
—
—
7
1
8
2
RESET
PT7A7611-7615/7621-7625/7631-7635
Document number: DS41672 Rev. 1 - 2
2 of 14
www.diodes.com
January 2019
© Diodes Incorporated
PT7A7611-7615/7621-7625/7631-7635
Functional Block Diagram
6(8)
WDI
Watchdog
Transition Detector
Vcc
Watchdog
Timer
8(2)
WDO
NEW PRODUCT
20k
1(3)
Timebase for
Reset&Watchdog
MR
7(1)
Reset Generator
2(4)
RESET
V
CC
V
RST
4(6)
PFI
1.25V
3(5)
5(7)
PFO
GND
Block Diagram of PT7A7611-7615
A(B)
A for SO-8
B for MSOP-8
6(8)
WDI
Watchdog
Transition Detector
Vcc
20k
Watchdog
Timer
8(2)
WDO
1(3)
Timebase for
Reset&Watchdog
MR
7(1)
Reset Generator
2(4)
RESET
V
CC
V
RST
4(6)
PFI
1.25V
3(5)
5(7)
PFO
GND
Block Diagram of PT7A7621-7625
A(B)
A for SO-8
B for MSOP-8
PT7A7611-7615/7621-7625/7631-7635
Document number: DS41672 Rev. 1 - 2
3 of 14
www.diodes.com
January 2019
© Diodes Incorporated
PT7A7611-7615/7621-7625/7631-7635
Functional Block Diagram
(Cont.)
V
CC
20k
1(3)
8(2)
RESET
MR
NEW PRODUCT
7(1)
Reset Generator
2(4)
RESET
V
CC
V
RST
PFI
4(6)
5(7)
PFO
1.25V
3(5)
GND
Block Diagram of PT7A7631-7635
A(B)
A for SO-8
B for MSOP-8
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
500
-40 to +85
-65 to +150
Unit
V
V
mA
mW
°
C
°
C
4. Stresses greater than those listed under MAXIMUM RATINGS may 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
2.5
1
Unit
kV
kV
Recommended Operating Conditions
(@T
A
= +25° unless otherwise specified.)
C,
Symbol
V
CC
T
A
Parameter
Supply Voltage for PT7A76x1/76x2
Supply Voltage for PT7A76x3/76x4
Supply Voltage for PT7A76x5
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
PT7A7611-7615/7621-7625/7631-7635
Document number: DS41672 Rev. 1 - 2
4 of 14
www.diodes.com
January 2019
© Diodes Incorporated
PT7A7611-7615/7621-7625/7631-7635
DC Electrical Characteristics
(V
CC
= V
RN
+ 5% to 5.5V, T
A
= -40 to +85° unless otherwise noted.)
C,
Symbol
Description
Supply Current
Test Conditions
PT7A76x1/76x2 V
CC
= 5V,
PT7A76x3/76x4 V
CC
= 3.3V,
PT7A76x5 V
CC
= 3.0V,
Left WDI unconnected (No output load)
4.5V < V
CC
< 5.5V
V
RST(MAX)
< V
CC
< 3.6V
V
CC
= 5.0V
V
RST(MAX)
< V
CC
< 3.6V
4.5V < V
CC
< 5.5V
V
RST(MAX)
< V
CC
< 3.6V
V
CC
= 5.0V
V
RST(MAX)
< V
CC
< 3.6V
—
PT7A76x1
V
RST
Reset Threshold Voltage (Note 6)
PT7A76x2
PT7A76x3
PT7A76x4
PT7A76x5
V
HYS
V
OH
Reset Threshold Hysteresis (Note 6)
Output High Voltage
—
4.5V < V
CC
< 5.5V, I
SOURCE
= 800µA
V
RST(MAX)
< V
CC
< 3.6V, I
SOURCE
= 500µA
4.5V < V
CC
< 5.5V, I
SINK
= 3.2mA
V
OL
V
PFT
I
PFI
I
WDI
R
MR
Notes:
(Note 5)
Max
200
—
—
—
—
0.8
0.6
0.8
0.6
V
RN
+2.0%
4.723
4.468
3.142
2.989
2.683
—
—
—
0.4
0.3
0.3
1.275
+1
+7
—
V
µA
µA
kΩ
V
%V
RN
V
V
V
V
Unit
µA
Min
—
2.0
0.7V
CC
3.5
0.7V
CC
—
—
—
—
V
RN
-2.0%
4.537
4.292
3.018
2.871
2.577
—
V
CC
-1.5
0.8×V
CC
—
—
—
1.225
-1
-7
—
Typ
10
—
—
—
—
—
—
—
—
V
RN
4.630
4.380
3.080
2.930
2.630
0.80
—
—
—
—
—
1.250
0.1
3
20
I
CC
MR
Input High Voltage
V
IH
WDI Input High Voltage
NEW PRODUCT
MR
Input Low Voltage
V
IL
WDI Input Low Voltage
Output Low Voltage
PFI Input Threshold
PFI Input Current
WDI Input Current (Note 7)
V
RST(MAX)
< V
CC
< 3.6V, I
SINK
= 1.2mA
V
CC
= 1.2V, I
SINK
= 100µA
PFI falling
—
WDI = 0 or V
CC
—
MR
Pull-up Resistor
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
is the Reset threshold voltage when V
CC
from high to low 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
—
—
4.5V < V
CC
< 5.5V
V
RST(MAX)
< V
CC
< 3.6V
4.5V < V
CC
< 5.5V
V
RST(MAX)
< V
CC
< 3.6V
4.5V < V
CC
< 5.5V
V
RST(MAX)
< V
CC
< 3.6V
Test Conditions
Min
140
1.0
150
500
—
—
50
100
Typ
200
1.6
—
—
—
—
—
—
Max
280
2.25
—
—
250
750
—
—
Unit
ms
s
ns
ns
ns
ns
MR
Pulse Width
MR
to RESET Delay
WDI Pulse Width
PT7A7611-7615/7621-7625/7631-7635
Document number: DS41672 Rev. 1 - 2
5 of 14
www.diodes.com
January 2019
© Diodes Incorporated
电子竞赛
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
