DS1817-5/T&R [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, +3.06VV, CMOS, 0.185 INCH, TO-92, 3 PIN;
| 型号： | DS1817-5/T&R |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, +3.06VV, CMOS, 0.185 INCH, TO-92, 3 PIN |
| 文件： | 总5页 (文件大小：112K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1817
Active High 3.3V EconoReset
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
C Automatically restarts a microprocessor after
power failure
DALLAS
DS1817
Econo
Reset
C Maintains reset for 150 ms after VCC returns
to an in-tolerance condition
C Reduces need for discrete components
C Precision temperature-compensated voltage
reference and voltage sensor
1
2
TOP VIEW
SOT-23 PACKAGE
See Mech.
C Accurate 5%, 10% or 20% power monitoring
C 20% tolerance for use with 3.0-volt systems
C Low-cost TO-92 or space saving surface
mount SOT-23 packages available
C Push-pull active high output
Drawings Section
On Website
1 2 3
1 2 3
C Operating temperature -40°C to +85°C
BOTTOM VIEW
TO-92 PACKAGE
See Mech.
Drawings Section
On Website
PIN DESCRIPTION
TO-92
1
2
3
RST
VCC
Active High Reset Output
Power Supply
GND
Ground
SOT-23
1
2
3
RST
VCC
Active High Reset Output
Power Supply
GND
Ground
DESCRIPTION
The DS1817 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.
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041002
DS1817
OPERATION - POWER MONITOR
The DS1817 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 (CMOS OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
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DS1817
TIMING DIAGRAM: POWER-UP Figure 3
TIMING DIAGRAM: POWER-DOWN Figure 4
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DS1817
ABSOLUTE MAXIMUM RATINGS*
Voltage on VCC Pin Relative to Ground
Voltage on RST Relative to Ground
Operating Temperature
-0.5V to +7.0V
-0.5V to 5VCC +0.5V
-40°C to +85°C
Storage Temperature
-55°C to +125°C
260°C for 10 seconds
Soldering Temperature
* 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
(-40LC to +85LC)
PARAMETER
SYMBOL MIN
VCC 0.0
TYP
MAX
5.5
UNITS NOTES
Supply Voltage
V
1
DC ELECTRICAL CHARACTERISTICS
(-40LC to +85LC; VCC=1.2V to 5.5V)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
VOH
VCC
VCC
V
1
Output Voltage @ 0-500 ꢀA
-0.5V -0.1V
Output Current @ 2.4V
Output Current @ 0.4V
Operating Current VCC < 5.5
VCC Trip Point (DS1817-5)
VCC Trip Point (DS1817-10)
VCC Trip Point (DS1817-20)
Output Capacitance
IOH
IOL
ICC
VCCTP
VCCTP
VCCTP
COUT
350
+10
28
2
2
3
1
1
1
ꢀA
mA
ꢀA
V
V
V
35
2.98
2.80
2.47
3.06
2.88
2.55
3.15
2.97
2.64
10
pF
AC ELECTRICAL CHARACTERISTICS
(-40LC to +85LC; VCC=1.2V to 5.5V)
PARAMETER
SYMBOL MIN
TYP
150
2
MAX
250
5
UNITS NOTES
RESET Active Time
VCC Detect to RST
VCC Slew Rate
tRST
tRPD
tF
100
300
0
ms
ꢀs
ꢀs
6
(VCCTP (MAX) to VCCTP (MIN))
VCC Slew Rate
tR
ns
(VCCTP (MIN) to VCCTP (MAX))
VCC Detect to RST
tRPU
100
150
250
ms
4, 5
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DS1817
NOTES:
1. All voltages are referenced to ground.
2. Measured with VCC O 2.7V.
3. Measured with RST output open.
4. Measured with 2.7V O VCC O 3.3V.
5. tR = 5 ꢀs.
6. The tF 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
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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