DS1233M-3 [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, +2.72VV, CMOS, PBCY3, TO-92, 3 PIN;
| 型号： | DS1233M-3 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, +2.72VV, CMOS, PBCY3, TO-92, 3 PIN |
| 文件： | 总4页 (文件大小：120K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1233M
EconoReset
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
C Automatically restarts microprocessor after
power failure
DALLAS
DS1233
1
2
8
7
NC
NC
C Maintains reset for 350 ms after VCC returns
to an in-tolerance condition
RST
V
Econo
Reset
C Reduces need for discrete components
C Precision temperature-compensated voltage
reference and voltage sensor
3
4
6
5
NC
NC
NC
GND
C Low-cost TO-92 package or surface mount
8-pin SOIC packages available
DS1233M 8-Pin SOIC
(150mil)
See Mech. Drawings
Section on Website
C Internal 5 kꢀ pullup resistor
C Compatible with Motorola 68XXX series
and HC16 Microprocessors
1
_
2
_
3
_
C Pin function compatible with the Motorola
MC33064, MC34064, MC33164, and
MC34164
C Operating temperature of -40°C to +85°C
1
2
3
BOTTOM VIEW
TO-92 PACKAGE
See Mech.
Drawings Section
On Website
PIN DESCRIPTIONS
TO-92
1 RST
2 VCC
- Active Low Reset Output
- Power Supply
- Ground
3 GND
8-Pin SOIC
RST
VCC
- Active Low Reset Output
- Power Supply
- No Connect
NC
GND
- Ground
DESCRIPTION
The DS1233M EconoReset uses a precision temperature-compensated 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 (low) state. When VCC returns to an
intolerance condition, the reset signal is kept in the active state for approximately 350 ms to allow the
power supply and processor to stabilize.
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041002
DS1233M
OPERATION - POWER MONITOR
The DS1233M 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 350 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 Figure 1
APPLICATION EXAMPLE Figure 2
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DS1233M
TIMING DIAGRAM: POWER-UP Figure 3
VOLTAGE TRIP LEVELS
PARAMETER
SYMBOL MIN
TYP MAX
UNITS NOTES
Voltage High Trip Level
DS1233M-5,
VHTL
4.75
V
DS1233M-55
Voltage Low Trip Level
DS1233M-5,
DS1233M-55
DS1233M-3
DS1233M-3
VLTL
4.00
V
Voltage High Trip Level
Voltage Low Trip Level
VHTL
VLTL
3.14
2.48
V
V
TIMING DIAGRAM: POWER-DOWN Figure 4
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DS1233M
ABSOLUTE MAXIMUM RATINGS*
Voltage on VCC Pin Relative to Ground
Voltage on I/O Relative to Ground
Operating Temperature
-0.5V to +7.0V
-0.5V to VCC + 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
(-40°C to +85°C)
PARAMETER
SYMBOL MIN
VCC 1.2
TYP MAX
UNITS NOTES
Supply Voltage
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
1
2,3
4
VOH
VCC-0.5V VCC-0.1V
V
mA
ꢂA
V
Output Voltage @ -500 ꢂA
Output Current @ 0.4V
Operating Current
IOL
+8
ICC
50
4.49
4.75
2.8
VCC Trip Point (DS1233M-5)
VCC Trip Point (DS1233M-55)
VCC Trip Point (DS1233M-3)
Output Capacitance
VCCTP
VCCTP
VCCTP
COUT
RP
4.25
4.5
2.64
4.375
4.625
2.72
1
V
1
1
V
10
pF
kꢀ
Internal Pullup Resistor
3.75
5
6.50
AC ELECTRICAL CHARACTERISTICS
(-40°C to +85°C; VCC = 1.2V to 5.5V)
PARAMETER
SYMBOL MIN
TYP
MAX UNITS NOTES
Reset Active Time
VCC Detect to RST
VCC Slew Rate (VHTL - VLTL
VCC Slew Rate (VLTL - VHTL
VCC Detect to RST
tRST
tRPD
tF
200
350
2
500
10
ms
ꢂs
)
)
300
0
ꢂs
tR
ns
tRPU
200
350
500
ms
5
NOTES:
1. All voltages are referenced to ground.
2. Measured with VCC O 2.7V.
3. A 1 kꢀꢃexternal resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with outputs open.
5. tR = 5 ꢂs.
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