DS1233A-10+ [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, +2.88VV, CMOS, PBCY3, TO-92, 3 PIN;
| 型号： | DS1233A-10+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, +2.88VV, CMOS, PBCY3, TO-92, 3 PIN |
| 文件： | 总5页 (文件大小：94K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1233A
3.3V EconoReset
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
. Automatically restarts microprocessor after
power failure
DALLAS
DS1233A
Econo
. Monitors pushbutton for external override
. Internal circuitry debounces pushbutton
switch
Reset
. Maintains reset for 350ms after VCC returns to
an in-tolerance condition or pushbutton
released
. Accurate 10% or 15% microprocessor 3.3V
power supply monitoring
. Reduces need for discrete components
. Precision temperature-compensated voltage
reference and voltage sensor
. Low-cost TO-92 package or surface mount
SOT-223 package
1
4
1 2 3
1 2 3
2
3
BOTTOM VIEW
TO-92 PACKAGE
TOP VIEW
SOT-223 PACKAGE
. Internal 5kpull-up resistor
. Operating temperature of -40C to +85C
PIN DESCRIPTION
PIN 1
GROUND
PIN 2
PIN 3
PIN 4
RESET
VCC
GROUND (SOT-223 ONLY)
DESCRIPTION
The DS1233A EconoReset monitors two vital conditions for a microprocessor: power supply and external
override. A precision temperature-compensated reference and comparator circuit are used to monitor the
status of the power supply (VCC). 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 350ms to allow the power supply and
processor to stabilize. The second function of the DS1233A is pushbutton reset control. The DS1233A
debounces a pushbutton closure and will generate a 350ms reset pulse upon release.
OPERATION — POWER MONITOR
The DS1233A provides the functions of detecting out-of-tolerance power supply conditions and warning
a processor-based system of impending power failure. When VCC is detected as out-of-tolerance as
defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active
for approximately 350ms after the power supply has reached the selected tolerance. This allows the power
supply and microprocessor to stabilize before RST is released.
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122001
DS1233A
OPERATION — PUSHBUTTON RESET
The DS1233A provides for a pushbutton switch to be connected to the RST output pin. When the
DS1233A is not in a reset cycle, it continuously monitors the RST signal for a low-going edge. If an edge
is detected, the DS1233A will debounce the switch by pulling the RST line low. After the internal timer
has expired, the DS1233A will continue to monitor the RST line. If the line is still low, the DS1233A will
continue to monitor the line looking for a rising edge. Upon detecting a release, the DS1233A will force
the RST line low and hold it low for 350ms.
NOTE:
For proper operation with an external pushbutton, a capacitor between 100pF and 0.01F must be
connected between RST and ground. In applications where additional reset current is required, a
minimum capacitance of 500 pF should be used, along with a parallel external pull-up resistor of 1k
minimum.
BLOCK DIAGRAM Figure 1
APPLICATION EXAMPLE Figure 2
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DS1233A
PUSHBUTTON RESET Figure 3
POWER-UP Figure 4
POWER-DOWN Figure 5
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DS1233A
ABSOLUTE MAXIMUM RATINGS*
Voltage on VCC Pin Relative to Ground
Voltage on I/O Relative to Ground
Operating Temperature Range
-0.5V to +7.0V
-0.5V to VCC +0.5V
-40°C to +85°C
Storage Temperature Range
Soldering Temperature
-55°C to +125°C
260°C for 10 seconds
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(-40C to +85C)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
Supply Voltage
VCC 1.2
3.3
5.5
V
1
DC ELECTRICAL CHARACTERISTICS
(-40C to +85C; VDD = 3.3V 10%)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
VOL
0.4
V
1
Low Level @ RST
Output Current @ 0.4V
Operating Current
IOL
ICC
+8
mA
A
V
50
2.97
2.80
10
VCC Trip Point 10%
VCC Trip Point 15%
Output Capacitance
Pushbutton Detect
VCCTP1
VCCTP2
COUT
PBDV
PBRD
RP
2.80
2.64
2.88
2.72
1
1
V
pF
V
0.8
2.0
1
Pushbutton Release
Internal Pull-Up Resistor
0.3
5
0.8
V
1, 2
3.75
6.25
k
AC ELECTRICAL CHARACTERISTICS
(-40C to +85C; VCC = 3.3V 10%)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
Reset Active Time
tRST
tRPD
250
350
450
ms
ns
100
VCC Detect to RST
VCC Slew Rate (2.85V - 2.3V)
VCC Slew Rate (2.3V - 2.85V)
Pushbutton Debounce
VCC Detect to RST
tF
tR
300
0
s
ns
PBDB
tRPU
250
250
350
350
450
450
ms
ms
NOTES:
1) All voltages are referenced to ground.
2) With a 100pF to 0.01F capacitor connected from RST to ground.
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DS1233A
ECONORESET SELECTION GUIDE
VCC TRIP POINT
PUSHBUTTON DETECT
MIN
4.0
TYP
4.125
4.375
4.625
4.125
4.375
4.625
4.125
4.375
4.625
2.72
MAX
4.24
4.49
4.75
4.24
4.49
4.75
4.24
4.49
4.75
2.80
2.97
MIN
1.8
TYP
MAX
DS1233-15
DS1233-10
DS1233-5
-
-
-
3.3
3.3
4.25
4.5
1.8
1.8
3.3
DS1233D-15
DS1233D-10
DS1233D-5
DS1833-15
DS1833-10
DS1833-5
4.0
N/A
N/A
N/A
N/A
N/A
N/A
0.8
N/A
N/A
N/A
N/A
N/A
N/A
2.0
5V
4.25
4.5
4.0
4.25
4.5
DS1233A-15
DS1233A-10
2.64
2.8
-
-
3.3V
2.88
0.8
2.0
PACKAGE INFORMATION
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
TO 92
PACKAGE CODE
Q3+1
DOCUMENT NO.
21-0248
TO 92
Q3+4
21-0250
SOT 223
K3+1
21-0264
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