DS1816R-15 [DALLAS]
Power Management Circuit, Fixed, +2.55VV, CMOS,;
| 型号： | DS1816R-15 |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | Power Management Circuit, Fixed, +2.55VV, CMOS, |
| 文件： | 总5页 (文件大小：51K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1816
3.3V EconoReset with
Open Drain 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
ꢀ Accurate 5%, 10% or 20% power monitoring
ꢀ 20% tolerance for use with 3.0-volt systems
ꢀ Low-cost TO-92 or space saving SOT-23
packages available
1 2 3
1 2 3
ꢀ Efficient open-drain output with internal
5 kΩ=pull-up resistor
ꢀ 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 DS1816 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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111999
DS1816
OPERATION - POWER MONITOR
The DS1816 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 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 (OPEN-DRAIN OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
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DS1816
TIMING DIAGRAM: POWER-UP Figure 3
TIMING DIAGRAM: POWER-DOWN Figure 4
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DS1816
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 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 V
Operating Current VCC < 5.5V
VCC Trip Point (DS1816-5)
VCC Trip Point (DS1816-10)
VCC Trip Point (DS1816-15)
Internal Pull-Up Resistor
Output Capacitance
IOL
ICC
+10
mA
µA
V
2, 3
4
28
35
3.15
2.97
2.64
7.5
VCCTP
VCCTP
VCCTP
RP
2.98
2.80
2.47
3.5
3.06
2.88
2.55
5.5
1
V
1
V
1
7
kΩ
pF
COUT
10
AC ELECTRICAL CHARACTERISTICS
(-40°C to +85°C; VCC=1.2V to 5.5V)
PARAMETER
SYMBOL MIN
TYP
150
2
MAX
250
5
UNITS NOTES
RESET Active Time
tRST
tRPD
100
ms
5
µs
VCC Detect to RST
VCC Slew Rate
tF
300
0
8
µs
(VCCTP (MAX) to VCCTP (MIN))
VCC Slew Rate
tR
ns
(VCCTP (MIN) to VCCTP (MAX))
tRPU
100
150
250
ms
5, 6
VCC Detect to RST
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DS1816
NOTES:
1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7V.
3. A 1kΩ=external pull-up resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with RST output open.
5. Measured with 2.7V ≤ VCC ≤ 3.3V.
6. tR = 5 µs.
7. VOH and IOH are a function of the value of RP and the associated output load conditions.
8. 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
“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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