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| 型号： | MAX6314US45D3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC RESET CIRCUIT 4.50V SOT143-4 |
| 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： | 双向 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-253-4，TO-253AA |
| 供应商设备封装： | SOT-143-4 |
| 包装： | 带卷 (TR) |
68HC11/Bidirectional-Compatible
μP Reset Circuit
V CC
V CC
68HC11
4.7k ?
RESET
RESET
RESET
RESET
MR
CIRCUITRY
C IN
C STRAY
C IN
CIRCUITRY
MAX6314
RESET
Figure 2. MAX6314 Supports Additional Devices on the Reset Bus
C IN
OTHER DEVICES
MR has an internal 63k ? pullup resistor, so it can be
left open if not used. Connect a normally open momen-
tary 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 environment, connecting a 0.1μF capacitor from
MR to ground provides additional noise immunity.
__________Applications Information
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
transients (glitches). The Typical Operating Character-
istics show the Maximum Transient Duration vs. Reset
Threshold Overdrive, for which reset pulses are not
generated. The graph was produced using negative-
going pulses, starting at V RST max and ending below
the programmed reset threshold by the magnitude
indicated (reset threshold overdrive). The graph shows
the maximum pulse width that a negative-going V CC
transient may typically have without causing a reset
pulse to be issued. As the amplitude of the transient
Ensuring a Valid RESET Output
Down to V CC = 0V
When V CC falls below 1V, RESET no longer sinks
current—it becomes an open circuit. Therefore, high-
impedance CMOS-logic inputs connected 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
V CC = 0V, adding a pull-down resistor to RESET will
cause any stray leakage currents to flow to ground,
holding RESET low (Figure 3). R1’s value is not critical;
100k ? is large enough not to load RESET and small
enough to pull RESET to ground.
V CC
MAX6314
RESET
increases (i.e., goes farther below the reset threshold),
the maximum allowable pulse width decreases. A 0.1μF
GND
R1
bypass capacitor mounted close to V CC provides addi-
tional transient immunity.
Figure 3. RESET Valid to V CC = Ground Circuit
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6314US45D4 | 制造商:Maxim Integrated Products 功能描述:68HC11/BIDIRECTIONAL-COMPATIBLE UP - Rail/Tube |
| MAX6314US45D4+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.5V 5UA 4PIN SOT-143 - Rail/Tube |
| MAX6314US45D4+T | 功能描述:监控电路 68HC11/Bidirectional Compatible uP Reset 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 |
| MAX6314US45D4-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 |
| MAX6314US46D1 | 制造商:Maxim Integrated Products 功能描述:68HC11/BIDIRECTIONAL-COMPATIBLE UP - Cut Tape Product |
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