PT7M1233A-10TCE [DIODES]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, LEAD FREE, TO-261, SOT-223, 4 PIN;
| 型号： | PT7M1233A-10TCE |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, LEAD FREE, TO-261, SOT-223, 4 PIN 光电二极管 |
| 文件： | 总7页 (文件大小：232K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Supervisory Circuit
Features
Description
The PT7M1233/1233A series are designed to monitor
High accurate: 1.5% (25°C)
power supplies in µP and digital systems. They
provide excellent circuit reliability and low cost by
eliminating external components and adjustments.
Operating voltage range: 1.0V ~ 5.5V
Operating temperature range: -40°C to + 85°C
Detect voltage temperature characteristics: 2.5%
TYP
The devices perform a single function: assert a reset
signal whenever the VCC supply voltage falls below a
preset threshold. Reset remains asserted 200ms after
VCC has risen above the reset threshold.
Output configuration: Bi-dir
Reset timeout period: typical 200ms
PT7M1233/1233A are bidirectional output, allowing it
to monitor a pushbutton on the reset output.
Pin Configuration
Pin Description
Name Type
Description
Reset Output and Pushbutton Input: RST is asserted when VCC drops below voltage threshold VTH-. Active
low. When other devices pull RST low, the reset condition occurs and will remain a reset timeout period at
least 200ms.
RST
I/O
GND
VCC
P
P
Ground
Supply Voltage.
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PT7M1233/1233A
Supervisory Circuit
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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) ..........................................................30mA
Power Dissipation .......................................... 320mW (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.
DC Electrical Characteristics
(TA= -40~85ºC, unless otherwise noted. Typical values are at TA = +25ºC)
Description
Supply Voltage
Sym.
Test Conditions
Min
1.0
-
Typ
Max
5.5
Unit
V
VCC
-
-
-
VCC = 5.5V. No load.
12
µA
µA
Supply Current
ICC
VCC = 3.6V. No load.
+25C
-
10
(VTH-
)
(VTH-)
VTH-
VTH-
2.88
2.88
2.72
2.72
50
V
V
0.985
(VTH-
0.975
(VTH-
0.985
(VTH-
0.975
(VTH-
0.985
(VTH-
1.015
(VTH-
1.025
(VTH-
1.015
(VTH-
1.025
(VTH-
1.015
(VTH-
Voltage Threshold
VTH-
)
)
-40C~85C
+25C
)
)
V
Voltage Threshold
(PT7M1233A-10)
VTH-
)
)
V
-40C~85C
+25C
)
)
V
Voltage Threshold
(PT7M1233A-15)
VTH-
)
)
V
-40C~85C
0.975
1.025
*
Hysteresis
VHYS
VTH+ - VTH-
-
-
mV
IOH = 8mA, VCC = 5V
IOH = 4mA, VCC = 3V
IOH = -50µA, VCC = 1V
-
-
-
-
-
-
0.4
0.3
Output
Driving
Output low
VOL
V
0.09
Note: VTH- is voltage threshold when VCC falls from high to low. VTH+ is voltage threshold when VCC rises from low to high.
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PT7M1233/1233A
Supervisory Circuit
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AC Electrical Characteristics
Timing diagram
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tSEN
VRST
VCC
1V
0V
tRS
tRPD
tRS
RST
1V
0V
VRST
VCC
1V
0V
tRS
tRS
tPD
0.8VCC
RST
1V
0.8V
0V
External pull down
signal release
Uncertain state
Note: If tPD < tRS, the reset pulse width will be tRS; if tPD > tRS, the width will be tPD + tRS
.
(VCC = 1.0V to 5.5V, TA= -40~85ºC, unless otherwise noted. Typical values are at TA = +25ºC)
Sym.
Description
Test Conditions
Min
140
-
Typ
200
17
-
Max
Unit
ms
s
tRS
Reset Timeout Period
-
-
-
280
tRPD Delay
tSEN Sensitivity
-
-
-
20
1
s
tPD
External Pull Down Signal Pulse
Pushbutton Debounce
-
s
RST pin
RST pin
RST pin
140
0.8
200
1.5
280
2.0
ms
V
Pushbutton Detect*
*Note: RST will be asserted when it is pull down to the typical value or less.
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PT7M1233/1233A
Supervisory Circuit
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Block Diagram
Vcc
5k
Reset
Monitor
VCC Resistor
Divider
RST
Timing
Delay
T.C.
Reference
GND
Function Description
Power Monitor
A microprocessor’s (µP’s) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in
reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout
conditions.
On power-up, once Vcc reaches about 1.0V, RST is a guaranteed logic low of 0.4V or less. As Vcc rises, RST stays low. When
Vcc rises above the reset threshold VRST, an internal timer releases RST after about 200ms. RST asserts 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 200ms. On power-down, once Vcc falls below the reset threshold, RST stays low and is guaranteed
to be 0.4V or less until Vcc drops below 1V.
Reset Output: Bi-direction
PT7M1233
The devices provide RST output pin for a pushbutton switch. When the devices are not in a reset cycle, it continuously monitors
the RST signal for a low going edge. If an edge is detected, the devices will debounce the switch by pulling the RST line low.
After the internal timer has expired, the devices will continue to monitor the RST line. If the line is still low, they will continue to
monitor the line looking for a rising edge. Upon detecting a release, they will force the RST line low and hold it low for 200ms.
PT7M1233A
When an out-of-tolerance condition is detected, an internal power fail signal is generated which forces reset to the active state.
When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 200ms to allow the
power supply and processor to stabilize. The second function of the PT7M1233A is pushbutton reset control. The PT7M1233A
debounces a pushbutton closure and will generate a 200ms reset pulse upon release.
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PT7M1233/1233A
Supervisory Circuit
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Application Information
Typical Operation Circuit
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PT7M1233 Application Example
Vcc
MICROPROCESSOR
RESET
RST
PT7M1233/1233A
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PT7M1233/1233A
Supervisory Circuit
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Mechanical Information
TC (SOT223-3)
DOCUMENT CONTROL NO.
PD-0022
REVISION: B
DATE: 5/16/2011
PKG. DIMENSIONS(MM)
SYMBOL
MIN
1.52
0
MAX
1.8
0.1
A
A1
A2
b
c
D
1.5
1.7
0.66
0.25
6.2
0.82
0.35
6.4
D1
E
2.9
3.3
3.1
3.7
E1
e
6.83
7.07
2.30BSC
e1
L
θ
4.5
0.9
0°
4.7
1.15
10°
Pericom Technology (Shanghai) Co.Ltd.
3/F., 20 Building , 481 Gui Ping Road,
Shanghai,200233
Tel:(86-21)6485-0576. Fax: (86-21)6485-2181
Note:
DESCRIPTION: 3-Pin SOT223
PACKAGE CODE: TC3
1) Ref: JEDEC TO-261C
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PT7M1233/1233A
Supervisory Circuit
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Ordering Information
Part Number
PT7M1233-15TCE
PT7M1233-10TCE
PT7M1233-5TCE
PT7M1233A-15TCE
PT7M1233A-10TCE
Note:
Package Code
Package
TC
TC
TC
TC
TC
Lead free and Green SOT223
Lead free and Green SOT223
Lead free and Green SOT223
Lead free and Green SOT223
Lead free and Green SOT223
E = Pb-free or Pb-free and Green
Adding X Suffix= Tape/Reel
Contact Pericom for availability.
Function Comparison Table
Item
Part No.
Reset Output
Threshold
4.1V
1
2
3
4
5
PT7M1233-15
PT7M1233-10
PT7M1233-5
Bi-direct, Active low
Bi-direct, Active low
Bi-direct, Active low
Bi-direct, Active low
Bi-direct, Active low
4.3V
4.6V
PT7M1233A-15
PT7M1233A-10
2.72V
2.88V
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Pericom 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 does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The
company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
2013-06-0001
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