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参数资料
| 型号： | MAX6390XS20D1-T |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
| 中文描述： | SC70封装，单/双低电压，低功耗レP复位电路 |
| 文件页数： | 6/11页 |
| 文件大小： | 195K |
| 代理商： | MAX6390XS20D1-T |
M
SC70, Single/Dual Low-Voltage,
Low-Power μP Reset Circuits
6
_______________________________________________________________________________________
Detailed Description
RESET Output
A μP reset input starts the μP in a known state. These
μP supervisory circuits assert reset to prevent code
execution errors during power-up, power-down, or
brownout conditions.
Reset asserts when V
CC
is below the reset threshold;
once V
CC
exceeds the reset threshold, an internal timer
keeps the reset output asserted for the reset timeout
period. After this interval, reset output deasserts. Reset
output is guaranteed to be in the correct logic state for
V
CC
≥
1V.
Manual Reset Input (MAX6384/
MAX6385/MAX6386/MAX6390)
Many μP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on
MR
asserts reset. Reset remains asserted while
MR
is low,
and for the reset active timeout period (t
RP
) after
MR
returns high. This input has an internal 63k
pullup
resistor (1.35k
for MAX6390), so it can be left uncon-
nected if it is not used.
MR
can be driven with TTL or
CMOS logic levels, or with open-drain/collector outputs.
Connect a normally open momentary switch from
MR
to
GND to create a manual-reset function; external
debounce circuitry is not required. If
MR
is driven from
long cables or if the device is used in a noisy environ-
ment, connecting a 0.1μF capacitor from
MR
to GND
provides additional noise immunity.
RESET IN Comparator
(MAX6387/MAX6388/MAX6389)
RESET IN is compared to an internal +1.27V reference.
If the voltage at RESET IN is less than 1.27V, reset
asserts. Use the RESET IN comparator as a user-
adjustable reset detector or as a secondary power-sup-
ply monitor by implementing a resistor-divider at RESET
IN (shown in Figure 1). Reset asserts when either V
CC
or RESET IN falls below its respective threshold volt-
age. Use the following equation to set the threshold:
V
INTH
= V
THRST
(R1/R2 + 1)
where V
THRST
= +1.27V. To simplify the resistor selec-
tion, choose a value of R2 and calculate R1:
R1 = R2 [(V
INTH
/V
THRST
) - 1]
Since the input current at RESET IN is 50nA (max),
large values can be used for R2 with no significant loss
in accuracy.
___________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
MAX6381
–
MAX6390 are relatively immune to short dura-
tion negative-going V
CC
transients (glitches).
The
Typical Operating Characteristics
section shows the
Maximum Transient Durations vs. Reset Comparator
Overdrive, for which the MAX6381
–
MAX6390 do not
generate a reset pulse. This graph was generated using
Reset Thresholds (-40°C to +125°C)
SUFFIX
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
V
TH
(min)
4.51
4.39
4.27
4.19
4.10
4.00
3.90
3.80
3.71
3.61
3.51
3.41
3.32
3.22
3.12
3.00
2.93
2.85
2.73
2.63
2.56
2.44
2.34
2.26
2.13
2.05
1.95
1.85
1.76
1.62
1.54
V
TH
(nom)
4.63
4.50
4.38
4.30
4.20
4.10
4.00
3.90
3.80
3.70
3.60
3.50
3.40
3.30
3.20
3.08
3.00
2.93
2.80
2.70
2.63
2.50
2.40
2.31
2.19
2.10
2.00
1.90
1.80
1.67
1.58
V
TH
(max)
4.74
4.61
4.48
4.41
4.31
4.20
4.10
4.00
3.90
3.79
3.69
3.59
3.49
3.38
3.28
3.15
3.08
3.00
2.87
2.77
2.69
2.56
2.46
2.37
2.24
2.15
2.05
1.95
1.85
1.71
1.61
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6384XS20D2-T | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
| MAX6385XS20D2-T | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
| MAX6386XS20D2-T | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
| MAX6387XS20D2-T | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
| MAX6388XS20D2-T | SC70, Single/Dual Low-Voltage, Low-Power レP Reset Circuits |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6390XS20D4 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6390XS20D4+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2V 7UA 4PIN SC-70 - Rail/Tube |
| MAX6390XS20D4+T | 功能描述:监控电路 Single uPower Reset Circuit RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6390XS20D4-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX6390XS20D7 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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