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MAX803TEXR-T

Supervisory Circuits 3-Pin Microprocessor Reset Circuits

器件类别：电源/电源管理    电源电路   

厂商名称：Maxim(美信半导体)

厂商官网：https://www.maximintegrated.com/en.html

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器件参数
参数名称
属性值
是否无铅
含铅
是否Rohs认证
不符合
厂商名称
Maxim(美信半导体)
零件包装代码
SOIC
包装说明
SC-70, 3 PIN
针数
3
Reach Compliance Code
not_compliant
ECCN代码
EAR99
可调阈值
NO
模拟集成电路 - 其他类型
POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码
R-PDSO-G3
JESD-609代码
e0
长度
2 mm
湿度敏感等级
1
信道数量
1
功能数量
1
端子数量
3
最高工作温度
125 °C
最低工作温度
-40 °C
封装主体材料
PLASTIC/EPOXY
封装代码
TSSOP
封装等效代码
SOT-323
封装形状
RECTANGULAR
封装形式
SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）
245
电源
1.2/5.5 V
认证状态
Not Qualified
座面最大高度
1.1 mm
最大供电电流 (Isup)
0.06 mA
最大供电电压 (Vsup)
5.5 V
最小供电电压 (Vsup)
1.2 V
标称供电电压 (Vsup)
3.3 V
表面贴装
YES
技术
CMOS
温度等级
AUTOMOTIVE
端子面层
Tin/Lead (Sn/Pb)
端子形式
GULL WING
端子节距
0.65 mm
端子位置
DUAL
阈值电压标称
+3.08V
处于峰值回流温度下的最长时间
NOT SPECIFIED
宽度
1.25 mm
文档预览
MAX803/MAX809/
MAX810
3-Pin Microprocessor Reset Circuits
General Description
The MAX803/MAX809/MAX810 are microprocessor (μP)
supervisory circuits used to monitor the power supplies
in μP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external components
and adjustments when used with +5V, +3.3V, +3.0V, or
+2.5V powered circuits.
These circuits perform a single function: they assert a
reset signal whenever the V
CC
supply voltage declines
below a preset threshold, keeping it asserted for at least
140ms after V
CC
has risen above the reset threshold.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The MAX803 has an open-drain output stage, while the
MAX809/MAX810 have push-pull outputs. The MAX803’s
open-drain
RESET
output requires a pullup resistor that
can be connected to a voltage higher than V
CC
. The
MAX803/MAX809 have an active-low
RESET
output,
while the MAX810 has an active-high RESET output. The
reset comparator is designed to ignore fast transients on
V
CC
, and the outputs are guaranteed to be in the correct
logic state for V
CC
down to 1V.
Low supply current makes the MAX803/MAX809/MAX810
ideal for use in portable equipment. The MAX803 is
available in a 3-pin SC70 package, and the MAX809/
MAX810 are available in 3-pin SC70 or SOT23 packages.
Benefits and Features
● Precision Monitoring of +2.5V, +3V, +3.3V, and
+5V Power-Supply Voltages
● Fully Specified Over Temperature
● Available in Three Output Configurations
• Open-Drain
RESET
Output (MAX803)
• Push-Pull
RESET
Output (MAX809)
• Push-Pull RESET Output (MAX810)
● 140ms (min) Power-On-Reset Pulse Width
● 12μA Supply Current
●
Guaranteed Reset Valid to V
CC
= +1V
● Power Supply Transient Immunity
● No External Components
● 3-Pin SC70 and SOT23 Packages
Selector Guide
and
Ordering Information
appear at end of data
sheet.
Typical Operating Circuit
V
CC
V
CC
V
CC
R
PULLUP
*
MAX803
MAX809
RESET
µP
RESET
INPUT
Applications
●
●
●
●
●
●
Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
GND
GND
*MAX803 ONLY
19-0344; Rev 10; 12/15
MAX803/MAX809/
MAX810
Absolute Maximum Ratings
Terminal Voltage (with respect to GND)
V
CC
...................................................................-0.3V to +6.0V
RESET,
RESET
(push-pull) .................. -0.3V to (V
CC
+ 0.3V)
RESET
(open drain) .........................................-0.3V to +6.0V
Input Current, V
CC
.............................................................20mA
Output Current, RESET,
RESET
........................................20mA
Rate of Rise, V
CC
..........................................................100V/μs
3-Pin Microprocessor Reset Circuits
Continuous Power Dissipation (T
A
= +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C) ...........174mW
3-Pin SOT23 (derate 4mW/°C above +70°C) .............320mW
Operating Temperature Range
3-Pin SC70 ................................................... -40°C to +125°C
3-Pin SOT23 ................................................. -40°C to +105°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
CC
= full range, T
A
= -40°C to +105°C (SOT23) or T
A
= -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
A
=
+25°C, V
CC
= 5V for L/M/J versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, and V
CC
= 2.5V for Z version.) (Note 1)
PARAMETER
V
CC
Range
SYMBOL
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +105°C (MAX8_ _ _EUR)
T
A
= -40°C to +125°C (MAX8_ _ _EXR)
I
CC
T
A
= -40°C
to +85°C
T
A
= +85°C
to +105°C
T
A
= -40°C
to +85°C
T
A
= +85°C
to +125°C
MAX8_ _L
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 5.5V, MAX8_ _L/M
V
CC
< 5.5V, MAX8_ _L/M
T
A
= +25°C
MIN
1.0
1.2
1.2
24
17
TYP
MAX
5.5
5.5
5.5
60
50
100
100
24
17
35
30
60
60
4.56
4.50
4.40
4.31
4.25
4.16
3.93
3.89
3.80
3.04
3.00
2.92
2.89
2.85
2.78
2.59
2.55
2.50
2.63
2.93
3.08
4.00
4.38
4.63
4.70
4.75
4.86
4.45
4.50
4.56
4.06
4.10
4.20
3.11
3.15
3.23
2.96
3.00
3.08
2.66
2.70
2.76
V
µA
V
UNITS
Supply Current (SOT23)
V
CC
< 3.6V, MAX8_ _R/S/T/Z
V
CC
< 3.6V, MAX8_ _R/S/T/Z
V
CC
< 3.6V, MAX8_ _R/S/T/Z
V
CC
< 3.6V, MAX8_ _R/S/T/Z
T
A
= -40°C to +85°C
T
A
= +25°C
Supply Current (SC70)
I
CC
T
A
= -40°C to +125°C
MAX8_ _M
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
MAX809J
(SOT only)
V
TH
MAX8_ _T
T
A
= -40°C to +85°C
T
A
= +25°C
Reset Threshold
(SOT only)
T
A
= -40°C to +125°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
MAX8_ _S
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
MAX8_ _R
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
www.maximintegrated.com
Maxim Integrated │
2
MAX803/MAX809/
MAX810
Electrical Characteristics (continued)
3-Pin Microprocessor Reset Circuits
(V
CC
= full range, T
A
= -40°C to +105°C (SOT23) or T
A
= -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
A
=
+25°C, V
CC
= 5V for L/M/J versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, and V
CC
= 2.5V for Z version.) (Note 1)
PARAMETER
SYMBOL
MAX8_ _L
CONDITIONS
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
MIN
4.56
4.50
4.44
4.31
4.25
4.20
3.04
3.00
2.95
2.89
2.85
2.81
2.59
2.55
2.52
2.28
2.25
2.22
30
20
140
100
140
100
240
240
560
840
460
840
0.3
0.4
0.3
0.8V
CC
V
CC
- 1.5
0.3
V
0.4
V
V
2.32
2.63
2.93
3.08
4.38
TYP
4.63
MAX
4.70
4.75
4.82
4.45
4.50
4.56
3.11
3.15
3.21
2.96
3.00
3.05
2.66
2.70
2.74
2.35
2.38
2.42
ppm/°C
µs
ms
ms
V
UNITS
T
A
= -40°C to +125°C
MAX8_ _M
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
MAX8_ _T
Reset Threshold
(SC70 only)
V
TH
MAX8_ _S
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
MAX8_ _R
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +125°C
MAX8_ _Z
(SC70 only)
Reset Threshold Tempco
V
CC
to Reset Delay (Note 2)
Reset Active Timeout Period
(SOT23)
Reset Active Timeout Period
(SC70)
RESET
Output Voltage Low
(push-pull active low and open-
drain active low, MAX803 and
MAX809)
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
V
CC
= V
TH
to (V
TH
- 100mV)
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
T
A
= +85°C to +105°C
T
A
= +85°C to +125°C
V
CC
= V
TH
(min), I
SINK
= 1.2mA,
MAX803R/S/T/Z, MAX809R/S/T/Z
V
OL
V
CC
= V
TH
(min), I
SINK
= 3.2mA,
MAX803L/M, MAX809J/L/M
V
CC
> 1.0V, I
SINK
= 50µA
V
OH
V
CC
> V
TH
(max), I
SOURCE
= 500µA,
MAX803R/S/T/Z, MAX809R/S/T/Z
V
CC
> V
TH
(max), I
SOURCE
= 800µA,
MAX803L/M, MAX809J/L/M
V
CC
= V
TH
(max), I
SINK
= 1.2mA,
MAX810R/S/T/Z
V
CC
= V
TH
(max), I
SINK
= 3.2mA,
MAX810L/M
RESET
Output Voltage High
(push-pull active low MAX809)
RESET Output Voltage Low
(push-pull active high, MAX810)
V
OL
www.maximintegrated.com
Maxim Integrated │
3
MAX803/MAX809/
MAX810
Electrical Characteristics (continued)
3-Pin Microprocessor Reset Circuits
(V
CC
= full range, T
A
= -40°C to +105°C (SOT23) or T
A
= -40°C to +125°C (SC70), unless otherwise noted. Typical values are at T
A
=
+25°C, V
CC
= 5V for L/M/J versions, V
CC
= 3.3V for T/S versions, V
CC
= 3V for R version, and V
CC
= 2.5V for Z version.) (Note 1)
PARAMETER
RESET Output Voltage High
(push-pull active high, MAX810)
RESET Open-Drain Output
Leakage Current (MAX803)
(Note 3)
SYMBOL
V
OH
CONDITIONS
1.8V < V
CC
< V
TH
(min), I
SOURCE
= 150µA
V
CC
> V
TH
, RESET deasserted
MIN
0.8V
CC
1
TYP
MAX
UNITS
V
µA
Note 1:
Production testing done at T
A
= +25°C; limits over temperature guaranteed by design only.
Note 2:
RESET
output for MAX803/MAX809; RESET output for MAX810.
Note 3:
Guaranteed by design, not production tested.
Typical Operating Characteristics
(V
CC
= full range, T
A
= -40°C to +105°C, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= +5V for L/M/J versions,
V
CC
= +3.3V for T/S versions, V
CC
= +3V for R version, and V
CC
= +2.5V for Z version.)
SUPPLY CURRENT vs. TEMPERATURE
(SC70 PACKAGE, NO LOAD)
MAX803 toc01
POWER-DOWN RESET DELAY vs.
TEMPERATURE (MAX8_ _R/S/T/Z)
MAX803-TOC3
POWER-DOWN RESET DELAY vs.
TEMPERATURE (MAX8_ _J/L/M)
V
OD
= V
TH
- V
CC
V
OD
= 10mV
POWER-DOWN RESET DELAY (µs)
120
100
80
60
40
20
0
-40
-20
V
OD
= 100mV
V
OD
= 200mV
20
0
40
TEMPERATURE (°C)
60
85
V
OD
= 20mV
MAX803-TOC4
15
MAX8_ _L/M, V
CC
= 5V
10
MAX8_ _R/S/T, V
CC
= 3.3V
MAX8_ _Z, V
CC
= 2.5V
5
MAX8_ _L/M/R/S/T/Z, V
CC
= 1V
0
-40
-20
0
20
40
60
100
POWER-DOWN RESET DELAY (µs)
80
60
40
20
0
V
OD
= V
TH
- V
CC
V
OD
= 10mV
V
OD
= 20mV
140
SUPPLY CURRENT (µA)
V
OD
= 100mV
V
OD
= 200mV
-40
-20
20
0
40
TEMPERATURE (°C)
60
85
85
TEMPERATURE (°C)
MAX803-TOC5
POWER-UP RESET TIMEOUT (µs)
MAX8_ _J/L/M
NORMALIZED THRESHOLD
245
240
235
230
225
1.002
1.001
1.000
0.999
0.998
0.997
MAX8_ _R/S/T/Z
-40
-20
0
20
40
60
85
-40
-20
0
20
40
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated │
4
MAX803-TOC6
250
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
1.003
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
MAX803/MAX809/
MAX810
Pin Configuration
TOP VIEW
GND 1
3-Pin Microprocessor Reset Circuits
MAX803
MAX809
MAX810
RESET
(RESET) 2
3
V
CC
( ) ARE FOR MAX810.
MAX803 AVAILABLE IN SC70-3 ONLY.
SC70-3/SOT23-3
to V
CC
, starting 0.5V above the actual reset threshold
and ending below it by the magnitude indicated (reset
comparator overdrive). The graph indicates the maximum
pulse width a negative-going V
CC
transient can have with-
out causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
maximum allowable pulse width decreases. Typically, for
the MAX8__L and MAX8__M, a V
CC
transient that goes
100mV below the reset threshold and lasts 20μs or less will
not cause a reset pulse. A 0.1μF bypass capacitor mounted
as close as possible to the V
CC
pin provides additional
transient immunity.
Pin Description
PIN
1
NAME
GND
RESET
(MAX803/
MAX809)
2
RESET
(MAX810)
Ground
RESET
Output remains low while V
CC
is below the reset threshold, and for at
least 140ms after V
CC
rises above the
reset threshold.
RESET Output remains high while V
CC
is below the reset threshold, and for at
least 140ms after V
CC
rises above the
reset threshold.
Supply Voltage (+5V, +3.3V, +3.0V, or
+2.5V)
FUNCTION
Ensuring a Valid Reset Output Down to
V
CC
= 0V
When V
CC
falls below 1V, the MAX809
RESET
output no
longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs connect-
ed to
RESET
can drift to undetermined voltages. This
presents no problem in most applications since most
μP and other circuitry is inoperative with V
CC
below 1V.
However, in applications where
RESET
must be valid
down to 0V, adding a pull-down resistor to
RESET
causes
any stray leakage currents to flow to ground, holding
RESET
low (Figure 2). R1’s value is not critical; 100kΩ is
large enough not to load
RESET
and small enough to pull
RESET
to ground.
A 100kΩ pullup resistor to V
CC
is also recommended for the
MAX810 if RESET is required to remain valid for V
CC
< 1V.
3
V
CC
Detailed Description
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The MAX803/MAX809/MAX810 assert reset
to prevent code-execution errors during power-up, power-
down, or brownout conditions. They assert a reset signal
whenever the V
CC
supply voltage declines below a preset
threshold, keeping it asserted for at least 140ms after V
CC
has risen above the reset threshold. The MAX803 uses
an open-drain output, and the MAX809/MAX810 have a
push-pull output stage. Connect a pullup resistor on the
MAX803’s
RESET
output to any supply between 0 and 6V.
Interfacing to μPs with Bidirectional Reset
Pins
Since the
RESET
output on the MAX803 is open
drain, this device interfaces easily with μPs that have
bidirectional reset pins, such as the Motorola 68HC11.
Connecting the μP supervisor’s
RESET
output directly to
the μC’s
RESET
pin with a single pullup resistor allows
either device to assert reset (Figure 3).
MAX803 Open-Drain
RESET
Output Allows
Use with Multiple Supplies
Applications Information
Negative-Going V
CC
Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX803/
MAX809/MAX810 are relatively immune to short-duration
negative-going V
CC
transients (glitches).
Figure 1 shows typical transient duration vs. reset
comparator overdrive, for which the MAX803/MAX809/
MAX810 do
not
generate a reset pulse. The graph
was generated using a negative-going pulse applied
Generally, the pullup connected to the MAX803 will
connect to the supply voltage that is being monitored at the
IC’s V
CC
pin. However, some systems may use the open-
drain output to level-shift from the monitored supply to reset
circuitry powered by some other supply (Figure 4). Note
that as the MAX803’s V
CC
decreases below 1V, so does
the IC’s ability to sink current at
RESET.
Also, with any
pullup,
RESET
will be pulled high as V
CC
decays toward
0. The voltage where this occurs depends on the pullup
resistor value and the voltage to which it is connected.
www.maximintegrated.com
Maxim Integrated │
5
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