DS1810-10 [DALLAS]
5V EconoReset with Push-Pull Output; 5V EconoReset推挽输出
| 型号： | DS1810-10 |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | 5V EconoReset with Push-Pull Output |
| 文件： | 总5页 (文件大小：57K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1810
5V EconoReset with Push-Pull Output
www.dalsemi.com
FEATURES
ꢀ Automatically restarts a microprocessor after
power failure
PIN ASSIGNMENT
3
ꢀ Maintains reset for 150 ms after VCC returns
to an in-tolerance condition
ꢀ Reduces need for discrete components
ꢀ Precision temperature-compensated voltage
reference and voltage sensor
1
2
SOT-23 PACKAGE
ꢀ Low-cost TO-92 or space saving surface
mount SOT-23 packages available
ꢀ Push-Pull output for low current operation
ꢀ Operating temperature -40°C to +85°C
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
PIN DESCRIPTION
TO-92
1
2
3
RST
VCC
GND
Active Low Reset Output
Power Supply
Ground
SOT-23
1
2
3
RST
VCC
GND
Active Low Reset Output
Power Supply
Ground
DESCRIPTION
The DS1810 EconoReset uses a precision temperature reference and comparator circuit 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 150 ms to allow the power supply and
processor to stabilize.
1 of 5
111999
DS1810
OPERATION - POWER MONITOR
The DS1810 provides the function 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, the RST
signal is asserted. On power-up, RST is kept active for approximately 150 ms after the power supply has
reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST
is released.
BLOCK DIAGRAM (PUSH-PULL OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
OUTPUT VALID CONDITIONS
All versions of the DS1810 can maintain a valid output as long as VCC remains above 1.2 volt. However,
the RST outputs on the DS1810 use a push-pull structure which can maintain a valid output below 1.2
volts on an input. To sink current below 1.2 volts, a resistor can be connected from RST to Ground (see
Figure 3). This arrangement will maintain a valid value on the RST outputs even it VCC approaches 0
volts. During both power-up and -down this arrangement will draw current when RST is in the high state.
A value of about 100 kኚ should be adequate to maintain a valid condition.
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DS1810
APPLICATION DIAGRAM:
RST VALID TO 0 VOLTS VCC ON THE DS1810 Figure 3
TIMING DIAGRAM: POWER-UP Figure 4
TIMING DIAGRAM: POWER-DOWN Figure 5
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DS1810
ABSOLUTE MAXIMUM RATINGS*
Voltage on VCC Pin Relative to Ground
-0.5V to +7.0V
Voltage on RST Relative to Ground
Operating Temperature
-0.5V to VCC +0.5V
-40°C to +85°C
Storage Temperature
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
(-40°C to +85°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS NOTES
Supply Voltage
VCC
1.2
5.5
V
1
DC ELECTRICAL CHARACTERISTICS
(-40°C to +85°C; VCC=1.2V to 5.5V)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS NOTES
VOH
VCC-0.5V VCC-0.1V
V
µA
mA
µA
V
1
2
2
3
1
1
1
Output Voltage @ 0-500 µA
Output Current @ 2.4V
Output Current @ 0.4V
Operating Current VCC < 5.5
VCC Trip Point (DS1810-5)
VCC Trip Point (DS1810-10)
VCC Trip Point (DS1810-15)
Output Capacitance
IOH
350
IOL
+10
ICC
30
40
VCCTP
VCCTP
VCCTP
COUT
4.50
4.25
4.00
4.62
4.37
4.12
4.75
4.49
4.24
10
V
V
pF
AC ELECTRICAL CHARACTERISTICS
(-40°C to +85°C; VCC=1.2V to 5.5V)
PARAMETER
SYMBOL
MIN
TYP
150
2
MAX
300
5
UNITS NOTES
RESET Active Time
tRST
100
ms
tRPD
µs
VCC Detect to RST
VCC Slew Rate
tF
300
0
µs
(VCCTP (MAX) to VCCTP (MIN))
VCC Slew Rate
tR
ns
(VCCTP (MIN) to VCCTP (MAX))
tRPU
100
150
300
ms
4
VCC Detect to RST
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DS1810
NOTES:
1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7 volts.
3. Measured with RST output open.
4. tR = 5 µs.
PART MARKING CODES
SOT-23 PACKAGE
“A”, “B”, &“C” represent the device type.
“D” represents the device tolerance.
810
811
812
813
815
816
817
818
-
-
-
-
-
-
-
-
DS1810
DS1811
DS1812
DS1813
DS1815
DS1816
DS1817
DS1818
A
B
C
D
-
-
-
-
5%
10%
15%
20%
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