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参数资料
| 型号： | MXD1818UR26+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | IC MPU RESET CIRC 2.55V SOT23-3 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 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 100 ms |
| 电压 - 阀值： | 2.55V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 1419 (CN2011-ZH PDF) |
| 其它名称： | MXD1818UR26+TDKR |
Low-Power μP Reset Circuits in 3-Pin
SC70/SOT23
Pin Descriptions (continued)
MXD1812/MXD1817
SC70
PIN
SOT23
NAME
FUNCTION
Push-Pull, Active-High Reset Output. RESET changes from low to high when V CC drops
2
1
RESET
below the selected reset threshold. RESET remains high for the reset timeout period after
V CC exceeds the device reset threshold.
1
3
2
3
V CC
GND
Supply Voltage and Input for Reset Threshold Monitor
Ground
MXD1813/MXD1818
SC70
PIN
SOT23
NAME
FUNCTION
Open-Drain, Active-Low Reset Output with Manual Reset Detect. RESET changes from
2
1
RESET
high to low when V CC drops below the selected reset threshold, or RESET is externally
pulled low for at least 1.5μs. RESET remains low for the reset timeout period after V CC
exceeds the device reset threshold or after the external manual reset is released. RESET
has an internal 5.5k Ω pullup resistor.
1
3
2
3
V CC
GND
Supply Voltage and Input for Reset Threshold Monitor
Ground
Detailed Description
RESET /RESET Output
A microprocessor’s (μP’s) reset input starts the micro-
processor in a known state. The MXD1810–MXD1813/
MXD1815 –MXD1818 μP supervisory circuits assert
reset to prevent code-execution errors during power-
up, power-down, and brownout conditions (Figure 4).
Whenever V CC falls below the reset threshold, the reset
output asserts. Once V CC exceeds the reset threshold,
an internal timer keeps the reset output asserted for the
specified reset timeout period (t RP ). Reset is also trig-
gered by an externally initiated rising edge on the
RESET pin (MXD1813/MXD1818), following a low signal
of 1.5μs minimum duration.
Push-Button Reset (MXD1813/MXD1818)
Many μP-based products require push-button reset
capability (Figure 5), allowing the operator, a test tech-
nician, or external logic circuitry to initiate reset. On the
MXD1813/MXD1818, a logic-low on RESET held for
greater than 1.5μs asserts a reset. RESET deasserts
following a 100ms minimum reset timeout delay
(t PBRST ). A manual reset input shorter than 1.5μs may
release RESET without the 100ms minimum reset time-
out delay. To facilitate use with mechanical switches,
the MXD1813/MXD1818 contain internal debouncing
circuitry. A debounced waveform is shown in Figure 6.
Applications Information
Interfacing to μPs with Bidirectional
Reset Pins
Since the RESET output on the MXD1811/MXD1816 is
open drain, these devices interface easily with μPs that
have bidirectional reset pins, such as the Motorola
68HC11. Connecting the μP supervisor’s RESET output
directly to the microcontroller’s (μC’s) RESET pin allows
either device to assert reset (Figure 7). No external
pullup resistor is required, as it is contained within the
MXD1811/MXD1816.
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 transients (glitches).
_______________________________________________________________________________________
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MXD1818UR29 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER MICROPROCESSOR RESET CIRCUITS IN 3- - Cut Tape Product |
| MXD1818UR29+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.88V 9UA 3PIN SOT-23 - Rail/Tube |
| MXD1818UR29+T | 功能描述:监控电路 3-Pin 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 |
| MXD1818UR29-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 |
| MXD1818UR31 | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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