PT7A7522 [ETC]
4.38V Reset Active High Supervisor? ; 4.38V复位高有效监？\n
| 型号： | PT7A7522 |
| 厂家： | 
ETC |
| 描述： | 4.38V Reset Active High Supervisor?
|
| 文件： | 总12页 (文件大小：57K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Features
Introduction
• 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)
- 2.32V (PT7A7516, 7526, 7536)
- 2.20V (PT7A7517, 7527, 7537)
• 200ms reset pulse width
The PT7A751X/752X/753X 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-µp, power-
down and brownout conditions for µP system;
2. Detecting power failure or low-battery conditions
with a 1.25V threshold detector;
• Debounced TTL/CMOS-compatible manual-
reset input
• Independent watchdog timer 1.6sec time-out (not
available for PT7A7531 - 7537)
3. Watchdog functions (not for PT7A753x).
• Reset output signal:
- Active-low only (PT7A7511 - 7517)
- Active-high only (PT7A7521 - 7527)
- Active-high and active-low (PT7A7531 - 7537)
• Voltage monitor for power-fail or low battery warning
• Guaranteed RESET/RESET valid at VCC = 1.2V
Applications
• Power-supply circuitry in µP systems
PT0082(05/02)
Ver:1
1
Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Contents
Features ....................................................................................................................................................... 1
Block Diagram ............................................................................................................................................ 1
Introduction ................................................................................................................................................. 1
Pin Information ........................................................................................................................................... 4
Pin Configuration .............................................................................................................................. 4
Pin Description .................................................................................................................................. 4
Functional Description ................................................................................................................................ 5
Reset Output ...................................................................................................................................... 5
Watchdog Timer ................................................................................................................................ 5
Manual Reset ..................................................................................................................................... 5
Power-Fail Comparator ..................................................................................................................... 5
Function Reference Table .................................................................................................................. 6
Detailed Specifications ................................................................................................................................ 7
Absolute Maximum Ratings .............................................................................................................. 7
Recommended Operation Condition ................................................................................................. 7
DC Electrical Characteristics ............................................................................................................. 8
AC Electrical Characteristics ............................................................................................................. 9
Ordering Information ................................................................................................................................ 10
Mechanical Information ............................................................................................................................ 11
Notes ......................................................................................................................................................... 12
PT0082(05/02)
Ver:1
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Block Diagram
Figure 1. Block Diagram of PT7A7511-7517/7521-7527
Watchdog
Transition Detector
Watchdog Timer
WDI
WDO
V
cc
Timebase for Reset
& Watchdog
250uA
MR
Vcc
RESET
Reset Generator
(RESET)
V
RST
PFI
PFO
1.25V
Figure 2. Block Diagram of PT7A7531-7537
Vcc
250uA
RESET
RESET
MR
Reset Generator
Vcc
V
RST
PFI
PFO
1.25V
PT0082(05/02)
Ver:1
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Pin Information
Pin Configuration
Figure 3. Pin Configuration
PT7A7511P-7517P
PT7A7511W-7517W
8-Pin PDIP/8-Pin SOIC
PT7A7521P-7527P
PT7A7521W-7527W
8-Pin PDIP/8-Pin SOIC
PT7A7531P-7537P
PT7A7531W-7537W
8-Pin PDIP/8-Pin SOIC
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
VCC
MR
VCC
MR
VCC
GND
PFI
GND
PFI
GND
PFI
PFO
PFO
PFO
Top View
Pin Description
Table 1. Pin Description
Pin Name
MR
Type
I
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.
Vcc
Power
Power Supply
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.
PFO
O
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
NC
No Connect
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.
PT0082(05/02)
Ver:1
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Watchdog Timer
Functional Description
The watchdog circuit monitors the µP’s activity. If the µP does
not toggle the watchdog input (WDI) within 1.6sec and WDI is
The PT75xx family can assert reset output during power-up,
power-down and brownout conditions for uP system, detect
not in high impedance, WDO goes low. As long as RESET is
power failure or low-battery conditions with a 1.25V threshold
asserted or the WDI input is in high impedance, the watchdog
detector and have watchdog functions. Refer to Table 2 for
timer will stay cleared and will not count. As soon as reset is
their individual features. The typical application see Figure 4.
released and WDI is driven high or low, the timer will start
counting. Pulses as short as 50ns can be detected.
Reset Output
Typically, WDO will be connected to the non-maskable
The supervisory circuits can assert reset for a microprocessor
interrupt input (NMI) of a µP. When VCC drops below the reset
during power-up, power-down and brownout to prevent code
threshold, WDO will go low whether or not the watchdog timer
execution errors.
has timed out yet. Normally this would trigger an NMI
interrupt, but RESET goes low simultaneously, and thus
On power-up, once VCC reaches about 1.2V, RESET is a
overrides the NMI interrupt. If WDI is left unconnected, WDO
guaranteed logic low of 0.4V or less.AsVCC rises, RESET stays
can be used as a low-line output. Since floating WDI disables
low. WhenVCC rises above the reset threshold, an internal timer
the internal timer, WDO goes low only when VCC falls below
releases RESET after about 200ms. RESET pulses low whenever
the reset threshold, thus functioning as a low-line output.
VCC drops below the reset threshold (brownout condition). If
brownout occurs in the middle of a previously initiated reset
pulse, the pulse continues for at least another 140ms.
Manual Reset
The manual-reset input (MR) allows reset to be triggered by a
On power-down, once VCC falls below the reset threshold,
push-button switch. The switch is effectively debounced by
RESET stays low and is guaranteed to be 0.4V or less untilVcc
the 140ms minimum reset pulse width. MR is TTL/CMOS
drops below 1V.
logic compatible, so it can be driven by any logic reset output.
The PT7A752x and PT7A753x active-high RESET output is
Power-Fail Comparator
simply the complement of the RESET output, and is guaranteed
to be valid with VCC down to 1.2V. Some µPs, such as Intel’s
80C51, require an active-high reset pulse.
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.
Figure 4. Typical Application Circuit
DC Linear
Regulator
IN
µP
OUT
Vcc
RESET
Vcc
RESET
P
Supervisory
µ
I/O Line
NMI
Interrupt
Circuit
PFI
MR
WDI
WDO
PFO
PT0082(05/02)
Ver:1
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Function Reference Table
Table 2. Function Table of PT7A75xx Family
Nom. Reset Time Nom. Watch dog
Reset Active Low
or High
Power Fail
Comp.
Manual Reset
Input
Part No.
Reset Threshold
(ms), tRS
Time (sec), tWD
PT7A7511
PT7A7521
PT7A7531
PT7A7512
PT7A7522
PT7A7532
PT7A7513
PT7A7523
PT7A7533
PT7A7514
PT7A7524
PT7A7534
PT7A7515
PT7A7525
PT7A7535
PT7A3516
PT7A3526
PT7A3536
PT7A7517
PT7A7527
PT7A7537
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
2.32V
2.32V
2.32V
2.20V
2.20V
2.20V
LOW
HIGH
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
1.6
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
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
1.25V detector
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
LOW, HIGH
LOW
unavailable
1.6
HIGH
1.6
LOW, HIGH
LOW
unavailable
1.6
HIGH
1.6
LOW, HIGH
LOW
unavailable
1.6
HIGH
1.6
LOW, HIGH
LOW
unavailable
1.6
HIGH
1.6
LOW, HIGH
LOW
unavailable
1.6
HIGH
1.6
LOW, HIGH
LOW
unavailable
1.6
HIGH
1.6
LOW, HIGH
unavailable
PT0082(05/02)
Ver:1
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Detailed Specifications
Absolute Maximum Ratings
Note:
Storage Temperature .......................................................-65oC to +150oC
Stresses greater than those listed under MAXIMUM
Ambient Temperature with Power Applied ....................... -40oC to +85oC
RATINGS may cause permanent damage to the
Supply Voltage to Ground Potential (Vcc to GND) ........... -0.3V to +7.0V
device. This is a stress rating only and functional
DC Input Voltage (All inputs except Vcc and GND) ..... -0.3VtoVCC+0.3V 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 ex-
tended periods may affect reliability.
DC Output Current (All outputs) .................................................... 20mA
Power Dissipation........................................................................ 500mW
(Depend on package)
Recommended Operation Condition
Table 3. DC Electrical Characteristics
Sym
VCC
Description
Test Conditions
Min
4.5
Typ
5.0
3.3
3.0
2.4
Max
5.5
Unit
V
Supply Voltage for 75x1, 75x2
Supply Voltage for 75x3, 75x4
Supply Voltage for 75x5, 75x6, 75x7
3.0
5.5
V
2.7
5.5
V
VCC > 4.0V
2.0
V
VIH1
VIH2
VIL1
MR Input High Voltage
WDI Input High Voltage
MR Input Low Voltage
VCC ≤ 4.0V
0.7VCC
0.7VCC
V
V
VCC > 4.0V
0.8
0.2VCC
0.3VCC
85
V
VCC ≤ 4.0V
V
VIL2
TA
WDI Input Low Voltage
Operating Temperature
V
-40
OC
PT0082(05/02)
Ver:1
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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DC Electrical Characteristics
Table 4. DC Electrical Characteristics
Sym
Description
Test Conditions
Min
Typ
30
Max
200
Unit
T7A75x1/75x2 VCC = 5V
PT7A75x3/75x4 VCC = 3.3V
PT7A75x5 VCC = 3.0V
PT7A75x6/75x7 VCC = 2.5V
Left WDI un-connected (No
output load)
ICC
Operational Power Supply Current
µΑ
TA=25oC
PT7A75x1
VRN
4.630
4.380
3.080
2.930
2.630
2.320
2.200
70
VRN+1.5%
4.699
4.446
3.126
2.974
2.669
2.355
2.233
VRN-1.5%
4.560
4.314
3.034
2.886
2.590
2.285
2.167
PT7A75x2
PT7A75x3
VRST
Reset Threshold Voltage *
V
PT7A75x4
PT7A75x5
PT7A75x6
PT7A75x7
VRTH
Reset Threshold Hysteresis *
Output HIGH Voltage
VCC varies between VRN – 5%
mV
V
Vcc > 4.5V Isource=800µA VCC-1.5
VOH
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
0.8VCC
0.8VCC
0.4
0.3
0.3
VOL
Output LOW Voltage
V
V
PFI varies from1.0V to 1.5V
1.23
1.20
1.25
1.25
1.27
V
V
(TA = 25oC)
VPFT
PFI Input Threshold
PFI Input Current
VPFI varies from1.0V to 1.5V
PFI connected to VCC
PFI connected to GND
WDI connected to VCC
WDI connected to GND
MR = 0, VCC= 5V
1.30
2.00
IPFI
µA
-2.00
30
-30
100
IWDI
IMR
Average WDI Input Current**
MR Input Current
µA
µA
-100
-600
-250
-100
* Valid for both RESET and RESET. VRN is nominal reset threshold voltage.
** WDI is internally serviced within the watchdog period if WDI is left unconnected.
PT0082(05/02)
Ver:1
8
Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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AC Electrical Characteristics
Table 5. AC Electrical Characteristics
Sym
tRS
Description
Test Conditions
Min
140
Typ
200
Max
280
Units
ms
Reset Pulse Width
MR from low to High
WDI and MR tied to VCC,
VCC > VRN + 5%
tWD
Watchdog Timeout Period
1.0
1.6
2.25
s
tMR
tMD
tWP
MR Pulse Width
MR to RESET Delay
WDI Pulse Width
150
ns
ns
ns
VCC = 5.0V
250
50
Figure 5. Watchdog Timing Diagram
tWP
tWD
tWD
tWD
5V
0V
WDI
5V
0V
WDO
5V
0V
Externally
Triggered by MR
RESET
RESET
tRS
5V
0V
Figure 6. Watchdog Timing Diagram
VRT
VRT
5V
0V
VCC
tRS
tRS
5V
0V
RESET
MR
5V
0V
tMD
tMR
5V
0V
WDO
PT0082(05/02)
Ver:1
9
Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Ordering Information
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
2.32
Package
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
PDIP-8
PDIP-8
PDIP-8
PDIP-8
PDIP-8
PDIP-8
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
2.32
Package
PT7A7511P
PT7A7521P
PT7A7531P
PT7A7512P
PT7A7522P
PT7A7532P
PT7A7513P
PT7A7523P
PT7A7533P
PT7A7514P
PT7A7524P
PT7A7534P
PT7A7515P
PT7A7525P
PT7A7535P
PT7A7516P
PT7A7526P
PT7A7536P
PT7A7517P
PT7A7527P
PT7A7537P
PT7A7511W
PT7A7521W
PT7A7531W
PT7A7512W
PT7A7522W
PT7A7532W
PT7A7513W
PT7A7523W
PT7A7533W
PT7A7514W
PT7A7524W
PT7A7534W
PT7A7515W
PT7A7525W
PT7A7535W
PT7A7516W
PT7A7526W
PT7A7536W
PT7A7517W
PT7A7527W
PT7A7537W
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
SOIC-8 (150mil)
2.32
2.32
2.32
2.32
2.20
2.20
2.20
2.20
2.20
2.20
PT0082(05/02)
Ver:1
10
Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Mechanical Information
Figure 7. 8-Pin SOIC
PT0082(05/02)
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Data Sheet
PT7A7511-7517/7521-7527/7531-7537
µP Supervisor Circuits
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Notes
Pericom Technology Inc.
Email: support@pti.com.cn
Web-Site: www.pti.com.cn, www.pti-ic.com
China:
No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China
Tel: (86)-21-6485 0576 Fax: (86)-21-6485 2181
Asia Pacific: Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong
Tel: (852)-2243 3660 Fax: (852)- 2243 3667
U.S.A.:
2380 Bering Drive, San Jose, California 95131, USA
Tel: (1)-408-435 0800 Fax: (1)-408-435 1100
Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve
design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any circuitry described
other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free
from patent infringement or other rights, of Pericom Technology Incorporation.
PT0082(05/02)
Ver:1
12
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