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| 型号： | MAX6391KA17+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU DL SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 140 ms/可调最小值 |
| 电压 - 阀值： | 1.67V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 带卷 (TR) |
Dual-Voltage μP Supervisory Circuits
with Sequenced Reset Outputs
Selector Guide
chain. The MAX6391 internally determines the CSRT
connection and provides the proper timing setup.
PART NUMBER
MAX6391KA 46
MAX6391KA44
MAX6391KA31
MAX6391KA 29
MAX6391KA26
MAX6391KA 23
MAX6391KA22
MAX6391KA17
MAX6391KA 16
MAX6392KA 46
MAX6392KA44
MAX6392KA31
MAX6392KA 29
MAX6392KA26
MAX6392KA 23
MAX6392KA22
NOMINAL
THRESHOLD (V)
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
4.63
4.38
3.08
2.93
2.63
2.32
2.19
TOP MARK
AAHJ
AAHK
AAHL
AAHM
AAHN
AAHO
AAHP
AAHQ
AAHR
AAHS
AAHT
AAHU
AAHV
AAHW
AAHX
AAHY
In all cases, RESET IN2 acts as the slave supply. V CC
can assert the RESET2 output but RESET IN2 will have
no effect on the RESET1 output.
Monitoring Voltages Other Than V CC
An external resistive-divider network is required at
RESET IN2 for most applications. The divider resistors,
R3 and R4, may be calculated by the following formula:
V RST = V TH2 ? (R3 + R4)/R4
where V TH2 = 625mV (internal reference voltage) and
V RST is the desired reset threshold voltage. R4 may be
set to a conveniently high value (500k ? for example, to
minimize current consumption) and the equation may
be solved for R3 by:
R3 = R4 ? (V RST /V TH2 - 1)
For single-supply operations requiring two reset out-
puts ( RESET1 before RESET2 ), connect RESET IN2
directly to V CC and adjust RESET2 timeout delay with
C CRST as desired.
Pullup Resistors
MAX6392KA17 1.67 AAHZ
MAX6392KA 16 1.58 AAIA
Standard versions in bold face. Samples are typically available
for standard versions. Contact factory for availability.
Applications Information
Selecting the Reset Timeout Capacitor
The RESET2 delay may be adjusted by the user with an
external capacitor connected from the CSRT pin to
ground. The MAX6391 includes a 600nA current source
that is switched to C CSRT to create a voltage ramp. The
voltage ramp is compared to the internal 1.25V refer-
ence to set the RESET2 delay period. The period is cal-
culated by:
? t = C ? ? V/I
where ? V = 1.25V, I = 600nA, and C is the external
capacitor.
Simplifying,
t RP = 2.08 ? 10 6 s / F ? C CSRT
For C CSRT = 1500pF, t RP = 3.1ms
A fixed internal 140ms (min) reset delay time for
RESET2 may be chosen by connecting the CSRT pin to
V CC . The V CC to CSRT connection disables the voltage
ramp and enables a separate fixed delay counter
The MAX6391 includes open-drain outputs for both
RESET1 and RESET2 . Two internal resistors, R1 and
R2, of 47k ? each are provided with internal connec-
tions to RESET1 and RESET2 . These resistors may be
connected to the appropriate external voltage for inde-
pendent V OH drive with no additional component
requirements.
The MAX6392 includes a manual reset option, MR , that
replaces the R1 pullup resistor. The active-low manual
reset input forces both RESET1 and RESET2 low.
RESET2 is driven active before RESET1 in all cases
(10μs typ). The resets follow standard reset timing
specifications after the manual reset is released. The
manual reset is internally pulled up to V CC through a
47k ? resistor.
Negative-Going V CC Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
V CC or RESET IN2 transients (glitches). The Typical
Operating Characteristics show the Maximum Transient
Duration vs. Reset Comparator Overdrive graph. The
graph shows the maximum pulse width that a negative-
going V CC transient may typically have without issuing
a reset signal. As the amplitude of the transient increas-
es, the maximum allowable pulse width decreases.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6391KA22 | 制造商:Maxim Integrated Products 功能描述:DUAL-VOLTAGE RESET CIRCUITS WITH SE - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6391KA22+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.19V/0.625V 15UA 8PIN SOT-23 - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6391KA22+T | 功能描述:监控电路 Dual 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 |
| MAX6391KA22-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 |
| MAX6391KA23 | 制造商:Maxim Integrated Products 功能描述:DUAL-VOLTAGE RESET CIRCUITS WITH SE - Rail/Tube |
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