参数资料
型号: MAX6735AKARVD3+T
厂商: Maxim Integrated Products
文件页数: 9/16页
文件大小: 0K
描述: IC SUPERVISOR MPU W/WD 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: 3
输出: 推挽式,图腾柱
复位: 低有效
复位超时: 最小为 140 ms
电压 - 阀值: 1.575V,2.625V,可调
工作温度: -40°C ~ 125°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)
Single-/Dual-/Triple-Voltage μP Supervisory
Circuits with Independent Watchdog Output
V CC 1,
V CC 2
RSTIN
V CC
(MIN)
V TH
RST
t RP
t RP
WDO
MR
Figure 1. RST , WDO , and MR Timing Diagram
Manual Reset Input
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 the reset output, clears the watchdog timer,
and deasserts the watchdog output. Reset remains
V EXT_TH
asserted while MR is low and for the reset timeout peri-
od (t RP ) after MR returns high. An internal 50k ? pullup
resistor allows MR to be left open if unused. Drive MR
with CMOS-logic levels or with open-drain/collector out-
R1
MAX6734A
MAX6735A
RSTIN
puts. Connect a normally open momentary switch from
MR to GND to create a manual reset function; external
debounce circuitry is not required. Connect a 0.1μF
capacitor from MR to GND to provide additional noise
immunity when driving MR over long cables or if the
device is used in a noisy environment.
Adjustable Input Voltage (RSTIN)
The MAX6734A/MAX6735A provide an additional high-
impedance comparator input with a 626mV threshold to
monitor a third supply voltage. To monitor a voltage
higher than 626mV, connect a resistive divider to the
circuit as shown in Figure 2 to establish an externally
controlled threshold voltage, V EXT_TH .
R2
GND
Figure 2. Monitoring a Third Voltage
V EXT_TH = 626mV ×
(R1 + R2)
R 2
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9
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