DS1233M [DALLAS]
EconoReset; EconoReset
| 型号： | DS1233M |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | EconoReset |
| 文件： | 总4页 (文件大小：39K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1233M
DS1233M
EconoReset
FEATURES
PIN ASSIGNMENT
• Automatically restarts microprocessor after power
DALLAS
DS1233
Econo
failure
• Maintains reset for 350 ms after V
returns to an
CC
Reset
in-tolerance condition
RST
1
2
3
4
8
7
6
5
NC
NC
NC
NC
V
CC
• Reduces need for discrete components
NC
• Precision temperature-compensated voltage refer-
ence and voltage sensor
GND
DS1233M 8–PIN SOIC
(150 MIL)
See Mech. Drawings
Section
• Low-cost TO-92 package or surface mount 8–pin
SOIC packages available
1
1
2
2
3
3
• Internal 5 KΩ pull-up resistor
• Compatible with Motorola 68XXX series and HC16
Microprocessors
• Pin function compatible with the Motorola MC33064,
MC34064, MC33164, and MC34164
DS1233M
TO-92 Package
See Mech. Drawings
Section
• Operating temperature of –40°C to +85°C
PIN DESCRIPTIONS
TO–92
1
2
3
RST
–
–
–
Active Low Reset Output
Power Supply
Ground
V
CC
GND
8–Pin SOIC
RST
–
–
–
–
Active Low Reset Output
Power Supply
No Connect
V
CC
NC
GND
Ground
DESCRIPTION
The DS1233M EconoReset uses a precision tempera-
(low) state. When V returns to an in-tolerance condi-
CC
ture compensated reference and comparator circuit to
tion, the reset signal is kept in the active state for ap-
proximately 350 ms to allow the power supply and pro-
cessor to stabilize.
monitor the status of the power supply (V ). When an
CC
out-of-toleranceconditionisdetected, aninternalpower
fail signal is generated which forces reset to the active
022698 1/4
DS1233M
by the tolerance of the part selected, the RST signal is
asserted. On power-up, RST is kept active for approxi-
mately 350 ms after the power supply has reached the
selected tolerance. This allows the power supply and
microprocessor to stabilize before RST is released.
OPERATION – POWER MONITOR
The DS1233M provides the functions of detecting
out-of-tolerancepower supply conditions and warning a
processor-based system of impending power failure.
When V is detected as out-of-tolerance, as defined
CC
BLOCK DIAGRAM Figure 1
V
CC
5KΩ
RST
Vcc TOLERANCE
AND BIAS
350 ms
DELAY
T.C. REFERENCE
GROUND
APPLICATION EXAMPLE Figure 2
V
CC
RST
MICROPROCESSOR
RESET
DS1233M
022698 2/4
DS1233M
TIMING DIAGRAM: POWER UP Figure 3
t
R
V
HTL
V
CCTP
V
LTL
V
CC
t
RPU
V
OH
RST
VOLTAGE TRIP LEVELS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Voltage High Trip Level
V
HTL
4.75
V
DS1233M–5,
DS1233M–55
Voltage Low Trip Level
V
LTL
4.00
V
DS1233M–5,
DS1233M–55
Voltage High Trip Level
Voltage Low Trip Level
V
3.14
2.48
V
V
DS1233M–3
DS1233M–3
HTL
V
LTL
TIMING DIAGRAM: POWER DOWN Figure 4
t
F
V
CC
V
HTL
V
CCTP
V
LTL
RST
t
RPD
V
OL
022698 3/4
DS1233M
ABSOLUTE MAXIMUM RATINGS*
Voltage on V Pin Relative to Ground
-0.5V to +7.0V
CC
Voltage on I/O Relative to Ground
Operating Temperature
Storage Temperature
–0.5V to V + 0.5V
–40°C to +85°C
-55°C to +125°C
CC
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
V
CC
1.2
5.5
V
1
DC ELECTRICAL CHARACTERISTICS
(–40°C to +85°C; VCC = 1.2V to 5.5V)
PARAMETER
SYMBOL
MIN
TYP
V –0.1V
CC
MAX
UNITS
V
NOTES
Output Voltage @ –500 µA
Output Current @ 0.4V
Operating Current
V
V
–0.5V
1
2, 3
4
OH
OL
CC
I
+8
mA
µA
V
I
50
4.49
4.75
2.8
CC
V
CC
V
CC
V
CC
Trip Point (DS1233M–5)
Trip Point (DS1233M–55)
Trip Point (DS1233M–3)
V
CCTP
V
CCTP
V
CCTP
4.25
4.5
4.375
4.625
2.72
1
V
1
2.64
V
1
Output Capacitance
C
10
pF
KΩ
OUT
Internal Pull-Up Resistor
R
3.75
5
6.50
P
AC ELECTRICAL CHARACTERISTICS
(–40°C to +85°C; VCC = 1.2V to 5.5V)
PARAMETER
SYMBOL
MIN
TYP
350
2
MAX
500
10
UNITS
ms
NOTES
Reset Active Time
t
200
RST
RPD
V
CC
V
CC
V
CC
V
CC
Detect to RST
t
µs
Slew Rate (V
Slew Rate (V
– V
)
)
t
F
300
0
µs
HTL
LTL
LTL
– V
t
R
ns
HTL
detect to RST
t
200
350
500
ms
5
RPU
NOTES:
1. All voltages are referenced to ground.
2. Measured with V ꢀ 2.7V.
CC
3. A 1KΩ external resistor may be required in some applications for proper operation of the microprocessor
reset control circuit.
4. Measured with outputs open.
5. t = 5 µs.
R
022698 4/4
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