DS1813-15 [DALLAS]
5V EconoReset with Pushbutton; 5V EconoReset带有按钮
| 型号： | DS1813-15 |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | 5V EconoReset with Pushbutton |
| 文件： | 总5页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1813
5V EconoReset with Pushbutton
www.dalsemi.com
FEATURES
ꢀ Automatically restarts a microprocessor after
power failure
PIN ASSIGNMENT
3
ꢀ Monitors pushbutton for external override
ꢀ Maintains reset for typically 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
ꢀ Efficient open-drain output with internal
5.5 kΩ=pull-up resistor
1 2 3
1 2 3
ꢀ Operating temperature -40°C to +85°C
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 DS1813 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.
The DS1813 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is
generated upon release and will be held in reset output low for typically 150 ms.
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111999
DS1813
OPERATION - POWER MONITOR
The DS1813 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, the RST
signal is asserted. On power-up, RST is kept active for approximately 150 µs after the power supply has
reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST
is released.
OPERATION - PUSHBUTTON RESET
The DS1813 provides for a pushbutton switch for manual reset control. When the DS1813 is not in a reset
cycle, a pushbutton reset can be generated by pulling the RST pin low for at least 1 ms. When the
pushbutton is held low, the RESET is forced active low and will remain active low for about 150 ms after
the pushbutton is released. See Figure 2 for an application example and Figure 3 for the timing diagram.
BLOCK DIAGRAM (OPEN-DRAIN OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
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DS1813
TIMING DIAGRAM: PUSHBUTTON RESET Figure 3
TIMING DIAGRAM: POWER-UP Figure 4
TIMING DIAGRAM: POWER-DOWN Figure 5
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DS1813
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 +5VCC +0.5V
-40°C to +85°C
Storage Temperature
-55°C to +125°C
Soldering Temperature
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 0.0
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
Output Current @ 0.4 volts
Voltage Input Low
Voltage Input High
IOL
VIL
VIH
+10
mA
V
2, 3
1
0.4
0.7
V
1
*VCC
Operating Current VCC < 5.5
VCC Trip Point (DS1813-5)
VCC Trip Point (DS1813-10)
VCC Trip Point (DS1813-15)
Internal Pull-Up Resistor
Output Capacitance
ICC
30
40
4.75
4.49
4.24
7.5
4
1
1
1
6
µA
V
VCCTP
VCCTP
VCCTP
RP
4.50
4.25
4.00
3.50
4.62
4.35
4.13
5.5
V
V
k
COUT
10
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
tRPD
100
ms
µs
VCC Detect to RST
VCC Slew Rate
tF
300
0
7
5
µs
(VCCTP (MAX) - VCCTP (MIN))
VCC Slew Rate
tR
ns
(VCCTP (MIN) - VCCTP (MAX))
tRPU
tPB
100
1
150
150
300
300
ms
VCC Detect to RST
µs
Pushbutton Detect to RST
Pushbutton Reset
tPBRST
100
ms
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DS1813
NOTES:
1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7 volts.
3. A 1kΩ=external resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with RST output open.
5. tR = 5 µs.
6. VOH and IOH are a function of the value of RP and the associated output load conditions.
7. This value is for reference in defining values for TRPD and should not be considered a requirement for
proper operation or use of the device.
PART MARKING CODES
“A”, “B”, &“C” represent the device type.
810 . . . . DS1810
“D” represents the device tolerance.
A . . . . . . 5%
811 . . . . DS1811
B . . . . . . 10%
812 . . . . DS1812
C . . . . . . 15%
813 . . . . DS1813
D . . . . . . 20%
815 . . . . DS1815
816 . . . . DS1816
817 . . . . DS1817
818 . . . . DS1818
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