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Data Sheet
PT7A7511-7515/7521-7525/7531-7535
µ
P Supervisor Circuits
Features
• Precision supply-voltage monitor
- 4.63V (PT7A7511, 7521, 7531)
- 4.38V (PT7A7512, 7522, 7532)
- 3.08V (PT7A7513, 7523, 7533)
- 2.93V (PT7A7514, 7524, 7534)
- 2.63V (PT7A7515, 7525, 7535)
• 200ms reset pulse width
• Debounced TTL/CMOS-compatible manual-
reset input
• Independent watchdog timer 1.6sec time-out (not
available for PT7A7531 - 7535)
• Reset output signal:
- Active-low only (PT7A7511 - 7515)
- Active-high only (PT7A7521 - 7525)
- Active-high and active-low (PT7A7531 - 7535)
• Voltage monitor for power-fail or low battery warning
• Guaranteed RESET/RESET valid at V
CC
= 1.2V
Discription
The PT7A751X/752X/753X family microprocessor (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.
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 PT7A753x).
Applications
• Power-supply circuitry in
µP
systems
PT0082L(03/06)
1
Ver:4
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Data Sheet
PT7A7511-7515/7521-7525/7531-7535
µ
P Supervisor Circuits
Ordering Information
P a r t N o.
PT7A7511P
PT7A7521P
PT7A7531P
PT7A7512P
PT7A7522P
PT7A7532P
PT7A7513P
PT7A7523P
PT7A7533P
PT7A7514P
PT7A7524P
PT7A7534P
PT7A7515P
PT7A7525P
PT7A7535P
Pa ck a ge
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
PDIP- 8
P a r t N o.
PT7A7511W
PT7A7521W
PT7A7531W
PT7A7512W
PT7A7522W
PT7A7532W
PT7A7513W
PT7A7523W
PT7A7533W
PT7A7514W
PT7A7524W
PT7A7534W
PT7A7515W
PT7A7525W
PT7A7535W
Pa ck a ge
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
SO IC- 8
P a r t N o.
PT7A7511DE
PT7A7521DE
PT7A7531DE
PT7A7512DE
PT7A7522DE
PT7A7532DE
PT7A7513DE
PT7A7523DE
PT7A7533DE
PT7A7514DE
PT7A7524DE
PT7A7534DE
PT7A7515DE
PT7A7525DE
PT7A7535DE
Pa ck a ge
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Die Form
Note:
Lead free package is available by add E after each part no. For example: PT7A7511PE for PDIP-8 lead free.
Function Comparison
Function Table of PT7A75xx Family
Part No.
PT 7A7511
PT 7A7521
PT 7A7531
PT 7A7512
PT 7A7522
PT 7A7532
PT 7A7513
PT 7A7523
PT 7A7533
PT 7A7514
PT 7A7524
PT 7A7534
PT 7A7515
PT 7A7525
PT 7A7535
PT0082L(03/06)
Re se t
Thre shold
4.63V
4.63V
4.63V
4.38V
4.38V
4.38V
3.08V
3.08V
3.08V
2.93V
2.93V
2.93V
2.63V
2.63V
2.63V
Reset Active Low
or High
LOW
HIGH
LOW, HIGH
LOW
HIGH
LOW, HIGH
LOW
HIGH
LOW, HIGH
LOW
HIGH
LOW, HIGH
LOW
HIGH
LOW, HIGH
Nom. Re set Ti me
(ms), t
RS
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
Nom. Watch dog
Time (sec), t
WD
1.6
1.6
unavailable
1.6
1.6
unavailable
1.6
1.6
unavailable
1.6
1.6
unavailable
1.6
1.6
unavailable
Powe r Fail Comp.
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
Manual Re se t
Input
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Ver:4
2
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Data Sheet
PT7A7511-7515/7521-7525/7531-7535
µ
P Supervisor Circuits
Block Diagram
Block Diagram of PT7A7511-7515/7521-7525
WDI
Watchdog
Transition Detector
Vcc
250uA
Watchdog Timer
WDO
Timebase for Reset
& Watchdog
MR
Reset Generator
Vcc
RESET
(RESET)
V
RST
PFI
1.25V
PFO
Block Diagram of PT7A7531-7535
Vcc
250uA
MR
Reset Generator
Vcc
RESET
RESET
V
RST
PFI
PFO
1.25V
PT0082L(03/06)
3
Ver:4
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Data Sheet
PT7A7511-7515/7521-7525/7531-7535
µ
P Supervisor Circuits
Pin Information
Pin Configuration
PT7A7511P-7515P
PT7A7511W-7515W
8-Pin PDIP/8-Pin SOIC
MR
V
CC
GND
PFI
1
2
3
4
8
7
6
5
WDO
RESET
WDI
PFO
MR
V
CC
GND
PFI
PT7A7521P-7525P
PT7A7521W-7525W
8-Pin PDIP/8-Pin SOIC
1
2
3
4
8
7
6
5
WDO
RESET
WDI
PFO
MR
V
CC
GND
PFI
PT7A7531P-7535P
PT7A7531W-7535W
8-Pin PDIP/8-Pin SOIC
1
2
3
4
8
7
6
5
RESET
RESET
NC
PFO
Top View
Pin Description
P in Na m e
MR
Vcc
GND
PFI
PFO
Typ e
I
Power
Ground
I
O
Descr ip t ion
Ma n u a l-R eset : triggers a reset pulse when pulled below 0.8V, active low. It has an internal 250
µA
pull-up current and be driven from a TTL or CMOS logic line as well as shorted to ground with a
switch.
Power Su p p ly
G r ou n d R efer en ce for all signals
Power -Fa il Volt a ge Mon it or I n p u t: When PFI is less than 1.25V, PFO goes low. Connect PFI to
GND or Vcc when not used.
Power -Fa il O u t p u t : it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays
high.
Wa t ch d og I n p u t: 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.
No C on n ect
O
R eset O u t p u t p u lses: low for 200ms when triggered, and stays low whenever Vcc is below the reset
threshold. It remains low for 200ms after Vcc rises above the reset threshold or MR goes from low
to high. A watchdog timeout will not trigger RESET unless WDO is connected to MR.
Wa t ch d og O u t p u t : 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 conditions.
Whenever Vcc is below the reset threshold, WDO stays low; however, unlike RESET, WDO does
not have minimum pulse width. As soon as Vcc rises above the reset threshold, WDO goes high
with no delay.
T h e inver se of R E SE T: active high. Whenever RESET is high, RESET is low.
WDI
I
NC
RESET
WDO
O
RESET
PT0082L(03/06)
O
4
Ver:4
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Data Sheet
PT7A7511-7515/7521-7525/7531-7535
µ
P Supervisor Circuits
Pad Identification
PT7A7511, PT7A7513, PT7A7514, PT7A7515,
No .
2
3
1
8
9
7
4
(0,0)
5
6
1
2
3
4
5
6
7
8
9
Symbol
MR
Vcc
GND
PFI
PFO
WDI
RESET
WDO
NC
Location (X,Y)
(229.25, 815.60)
(130.25, 815.60)
(88.00, 626.80)
(383.75, 151.05)
(482.95, 151.05)
(581.95, 151.05)
(526.65, 815.60)
(328.45, 815.60)
(427.45, 815.60)
Note:
1)Wafer Size: 6 inch
2)Wafer Thickness: 675um
3)Chip Size: 810um*1060um (include scribe line width 100um*100um)
4)PAD Location: Refer above diagram and table. PAD size75um*75um
5)PAD discription refer to Pin discription
PT7A7512
2
2
No.
1
8
9
7
6
1
2
3
4
5
6
7
8
9
Symbol
MR
Vcc
GND
PFI
PFO
WDI
RESET
WDO
NC
3
3
(0,0)
Note:
4
5
Location (X,Y)
(323.20, 973.00)
(158.00, 1047.10)
(158.00, 947.00)
(123.60, 313.4)
(123.60, 213.4)
(577.50, 149.90)
(733.50, 149.9)
(893.80, 785.90)
(893.80, 941.90)
(479.20, 973.00)
(605.20, 973.00)
1)Wafer Size: 6 inch
2)Wafer Thickness: 350um
3)Chip Size: 1190um*1210um (include scribe line width 150um*90um)
4)PAD Location: Refer above diagram and table. PAD size85um*85um
5)PAD discription refer to Pin discription
PT0082L(03/06)
5
Ver:4
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