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参数资料
| 型号： | MAX6448UK31L+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC MPU RESET 3.075V SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.075V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
μP Reset Circuits with Long Manual Reset
Setup Period
+3.3V
+1.5V
CORE SUPPLY I/O SUPPLY
5V
3.3V
V CC
RESET
RESET
V CC
MAX6451
RSTIN
MR1
μ P
DIGITAL INPUT
MAX6444
MAX6446
MAX6448
100k ?
μ P
MAX6450
MAX6452
GND
MR2
RESET
RESET
N
SMART CARD DETECT:
IMMEDIATE ONE-SHOT
WHEN MANUAL
RESET CLOSES
FRONT-PANEL SWITCH
STANDARD μ P INPUT
AND t MR MANUAL
RESET DELAY
GND
Figure 7. MAX6451/MAX6452 Application Circuit
a microprocessor for general-purpose I/O control. MR2
monitors a switch to detect when a smart card is inserted.
When the switch is closed high (card inserted), RESET
one-shot pulses low for 140ms. MR2 is internally
debounced for 210ms to prevent false resets when the
smart card is removed.
Interfacing to Other Voltages
for Logic Compatibility
The open-drain RESET output can be used to interface
to a μP with other logic levels. As shown in Figure 8, the
open-drain output can be connected to voltages from 0
to 6V.
Generally, the pullup resistor connected to the RESET
connects 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 8). Keep in mind that as the supervisor’s V CC
decreases toward 1V, so does the IC’s ability to sink
current at RESET . RESET is 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.
Figure 8. Interfacing to Other Voltage Levels
Ensuring a Valid RESET Down to
V CC = 0V (Push-Pull RESET )
When V CC falls below 1V, RESET current-sinking capa-
bilities decline drastically. The high-impedance CMOS-
logic inputs connected to RESET can drift to
undetermined voltages. This presents no problems in
most applications, because most μPs and other circuitry
do not operate with V CC below 1V.
In applications in which RESET must be valid down to
0V, add a pulldown resistor between RESET and GND
for the push-pull outputs. The resistor sinks any stray
leakage currents, holding RESET low (Figure 9). The
value of the pulldown resistor is not critical; 100k ? is
large enough not to load RESET and small enough to
pull RESET to ground. The external pulldown cannot be
used with the open-drain reset outputs.
Transient Immunity
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these supervi-
sors are relatively immune to short-duration falling tran-
sients (glitches). The graph Maximum Transient Duration
vs. Reset Threshold Overdrive in the Typical Operating
Characteristics section shows this relationship.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6448UK44L | 制造商:Maxim Integrated Products 功能描述:+P RESET CIRCUITS WITH LONG MANUAL - Rail/Tube |
| MAX6448UK44L+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.38V 7UA 5PIN SOT-23 - Rail/Tube |
| MAX6448UK44L+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 |
| MAX6448UK44L-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 |
| MAX6448UK46L | 制造商:Maxim Integrated Products 功能描述:+P RESET CIRCUITS WITH LONG MANUAL - Cut Tape Product |
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