PT7A7521WE [DIODES]
Power Supply Management Circuit, Fixed, 1 Channel, PDSO8, SOIC-8;
| 型号： | PT7A7521WE |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Power Supply Management Circuit, Fixed, 1 Channel, PDSO8, SOIC-8 光电二极管 |
| 文件： | 总9页 (文件大小：512K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT7A7511-15/7521-25/7531-35
μP Supervisor Circuits
Features
Description
Precision supply-voltage monitor
The PT7A751X/752X/753X family micro-processor
(P) supervisory circuits are targeted to improve
reliability and accuracy of power-supply circuitry in
P’s systems. These devices reduce the complexity and
number of components required to monitor power-
supply and battery functions.
-
-
-
-
-
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
The main functions are:
Debounced TTL/CMOS-compatible manual-
reset input
1. Asserting reset output during power-up, power-
down and brownout conditions for P system.
Independent watchdog timer 1.6sec time-out (not
available for PT7A7531 - 7535)
Reset output signal:
2. Detecting power failure or low-battery
conditions with a 1.25V threshold detector.
-
-
-
Active-low only (PT7A7511 - 7515)
3. Watchdog functions (not for PT7A753x)
Active-high only (PT7A7521 - 7525)
Active-high and active-low (PT7A7531 - 7535)
Applications
Voltage monitor for power-fail or low battery
warning
Power-supply circuitry in P systems
Guaranteed RESET/RESET valid at VCC=1.2V
Pin Configuration
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
WDO
RESET
WDI
WDO
RESET
WDI
RESET
RESET
NC
MR
V CC
GND
PFI
MR
V CC
GND
PFI
MR
V CC
GND
PFI
PFO
PFO
PFO
Top View
PT7A7511W-7515W
PT7A7521W-7525W
PT7A7531W-7535W
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PT7A7511-15/7521-25/7531-35
Pin Description
Pin
Type
Description
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.
I
MR
VCC
Power
Supply Voltage.
GND
Ground
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 Vcc when not used.
PFI
I
Power-Fail Output: it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays high.
O
PFO
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.
WDI
I
Reset Output pulses: 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.
RESET
O
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 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.
WDO
O
O
RESET
The inverse of RESET, active high. Whenever RESET is high, RESET is low.
Block Diagram
Block Diagram of PT7A7511-7515/7521-7525
Watchdog
WDI
Watchdog Timer
WDO
Transition Detector
V
cc
Timebase for Reset
& Watchdog
250uA
MR
Vcc
RESET
Reset Generator
(RESET)
VRST
PFI
PFO
1.25V
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Block Diagram of PT7A7531-35
Vcc
250uA
RESET
RESET
MR
Vcc
Reset Generator
VRST
PFI
PFO
1.25V
Maximum Ratings
Note:
Storage Temperature ............................................................-65oC to +150oC
Ambient Temperature with Power Applied.......................... -40oC to +85oC
Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V
DC Input Voltage (All inputs except Vcc and GND)......-0.3V to VCC+0.3V
DC Output Current (All outputs) ..........................................................20mA
Power Dissipation .......................................... 500mW (Depend on package)
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 condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended Operation Conditions
Symbol
Description
Test Conditions
Min.
Typ.
Max.
Unit
Supply Voltage for 75x1,75x2
Supply Voltage for 75x3,75x4
Supply Voltage for 75x5
-
-
4.5
5.0
3.3
3.0
2.4
-
5.5
5.5
V
V
VCC
3.0
2.7
5.5
VCC > 4.0V
2.0
VCC
VCC
VCC
0.8
V
V
V
V
V
V
ºC
VIH1
VIH2
VIL1
MR Input High Voltage
WDI Input High Voltage
MR Input Low Voltage
VCC ≤ 4.0V
0.7VCC
-
0.7VCC
-
VCC > 4.0V
-
-
-
VCC ≤ 4.0V
-
0.2VCC
0.3VCC
85
VIL2
TA
WDI Input Low Voltage
Operating Temperature
-
-
-
-
-40
-
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DC Electrical Characteristics
(VCC = VRN + 5% to 5.5V, TA= -40~85ºC, unless otherwise noted.)(Note 1)
Symbol
Description
Test Conditions
Min.
Typ.
Max.
Unit
75x1/x2 Vcc = 5V,
75x3/x4 Vcc = 3.3V,
75x5 Vcc = 3.0V, Left WDI un-
connected (No output load)
ICC
Supply Current
-
30
200
µA
VIH
VIL
Input High Voltage
Input Low Voltage
0.7VCC
-
-
-
VCC
0.3VCC
V
V
Pin: MR, WDI
Pin: MR, WDI
TA= 25ºC
VRN - 1.5%
4.560
VRN
4.630
VRN + 1.5%
4.699
75x1
75x2
75x3
75x4
4.314
3.034
2.886
4.380
3.080
2.930
4.446
3.126
2.974
Reset Threshold Voltage
(Note 2)
VRST
V
75x5
2.590
-
2.630
70
2.669
-
Reset Threshold Voltage
(Note 2)
VCC Varies between VRN - 5%
mV
V
VRTH＋
Vcc-1.5
-
VCC
VCC
VCC
0.4
Vcc 4.5V Isource=800µA
Vcc 2.7V Isource=500µA
Vcc 1.8V Isource=150µA
Vcc 4.5V Isink=3.2mA
Vcc 2.7V Isink=1.2mA
Vcc 1.2V Isink=100µA
VPFI varies from 1.0V to 1.5V
VPFI varies from 0V to 1.0V
PFI connected to Vcc
VOH
Output High Voltage
Output Low Voltage
0.8×Vcc
-
0.8×Vcc
-
-
-
-
VOL
-
0.3
V
-
-
0.3
1.23
1.20
-
1.25
1.25
-
1.27
1.30
2.00
-
VPFT
IPFI
PFI Input Threshold
PFI Input Current
V
µA
PFI connected to GND
-2.00
-
-
WDI connected to VCC
30
-30
-250
100
-
Average WDI Input
Current (Note 3)
µA
µA
IWDI
IMR
WDI connected to GND
-100
-600
-100
MR input Current
MR=0, Vcc = 5V
Note: 1. Parameters of room temperature guaranteed by production test and parameters of full-temperature guaranteed by design.
2. Valid for both RESET and RESET. VRST is the Reset threshold voltage when VCC from high to low level, VRN is nominal reset threshold voltage.
3. WDI is internally serviced within the watchdog period if WDI is left unconnected.
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AC Electrical Characteristics
Symbol
Description
Test Conditions
Min.
160
1.2
200
-
Typ.
Max.
280
2.25
-
Unit
ms
s
tRS
Reset Pulse Width
Watchdog Timeout Period
200
MR from low to High.
tWD
1.6
WDI, MR tied to VCC, VCC >VRN+5%.
-
tMR
-
-
-
ns
MR Pulse Width
tMD
VCC =5V
-
250
-
ns
MR to RESET Delay
WDI Pulse Width
tWP
150
ns
Watchdog Timing Diagram
tWP
tWD
tWD
tWD
5V
WDI
0V
5V
0V
WDO
5V
0V
Externally
Triggered by MR
RESET
tRS
5V
0V
RESET
Watchdog Timing Diagram
V
V
RT
RT
5V
V
CC
tRS
tRS
0V
5V
0V
RESET
MR
5V
0V
tMD
tMR
5V
0V
WDO
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Functional Description
The PT75xx family can assert reset output during power-up, power-down and brownout conditions for P system, detect power
failure or low-battery conditions with a 1.25V threshold detector and have watchdog functions. Refer to Function Table of
PT7A75xx Family for their individual features. The typical application see Figure 4.
Reset Output
The supervisory circuits can assert reset for a microprocessor during power-up, power-down and brownout to prevent code
execution errors.
On power-up, once Vcc reaches about 1.2V, RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, RESET stays low.
When Vcc rises above the reset threshold, an internal timer releases RESET after about 200ms. RESET pulses low whenever Vcc
drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the
pulse continues for at least another 140ms. On power-down, once Vcc falls below the reset threshold, RESET stays low and is
guaranteed to be 0.4V or less until Vcc drops below 1.0V.
The PT7A752x and PT7A753x active-high RESET output is simply the inverse of the RESET output, and is guaranteed to be
valid with Vcc down to 1.2V. Some Ps, such as Intel’s 80C51, require an active-high reset pulse.
Watchdog Timer
The watchdog circuit monitors the P activity. If the P does not toggle the watchdog input (WDI) within 1.6sec and WDI is not
in high impedance, WDO goes low. As long as RESET is asserted or the WDI input is in high impedance, the watchdog timer will
stay cleared and will not count. As soon as reset is released and WDI is driven high or low, the timer will start counting. Pulses as
short as 50ns can be detected.
Typically, WDO will be connected to the non-maskable interrupt input (NMI) of a P. When VCC drops below the reset threshold,
WDO will go low whether or not the watchdog timer has timed out yet. Normally this would trigger an NMI interrupt, but RESET
goes low simultaneously, and thus overrides the NMI interrupt. If WDI is left unconnected, WDO can be used as a low-line output.
Since floating WDI disables the internal timer, WDO goes low only when VCC falls below the reset threshold, thus functioning as
a low-line output. Do not apply voltage level over VCC
.
Manual Reset
The manual-reset input (MR) allows reset to be triggered by a push button switch. The switch is effectively debounced by the
140ms minimum reset pulse width. MR is TTL/CMOS logic compatible, so it can be driven by any logic reset output. Do not
apply voltage level over VCC.
Power-Fail Comparator
The power-fail comparator will send out a Low signal once detects a voltage lowered than 1.25V. It can be used for various
purposes because its output and non-inverting input are not internally connected. The inverting input is internally connected to a
1.25V reference.
Typical Application Circuit
DC Linear
Regulator
IN
P
OUT
Vcc
RESET
Vcc
RESET
P
Supervisory
I/O Line
NMI
Interrupt
Circuit
PFI
MR
WDI
WDO
PFO
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Mechanical Information
W (SOIC-8L)
For latest package info.
please check: http://www.diodes.com/design/support/packaging/pericom-packaging/packaging-mechanicals-and-thermal-characteristics/
Ordering Information
Part Number
PT7A751xWE
PT7A752xWE
PT7A753xWE
Package Code
Package Description
W
W
W
8-Pin, 150mil-Wide (SOIC)
8-Pin, 150mil-Wide (SOIC)
8-Pin, 150mil-Wide (SOIC)
Note: • “x” refers to voltage range, see below Function Comparison Table.
• E=Lead-free or Lead-free and Green
• Adding X suffix=Tape/Reel
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Function Comparison Table
Part No.
Reset
Threshold
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. Reset
Time (ms), tRS
200
Nom. Watch dog
Time (sec), tWD
Power Fail
Comp.
Manual
Reset Input
Yes
PT7A7511
PT7A7521
PT7A7531
PT7A7512
PT7A7522
PT7A7532
PT7A7513
PT7A7523
PT7A7533
PT7A7514
PT7A7524
PT7A7534
PT7A7515
PT7A7525
PT7A7535
1.6
1.6
unavailable
1.6
1.6
unavailable
1.6
1.6
unavailable
1.6
1.6
unavailable
1.6
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
200
200
200
200
200
200
200
200
200
200
200
200
200
200
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1.6
unavailable
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IMPORTANT NOTICE
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any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes
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by Diodes Incorporated.
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