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| 型号： | MAX6334UR25D1+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | IC MPU/RESET CIRC 2.50V SOT-143 |
| 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 1 ms |
| 电压 - 阀值： | 2.5V |
| 工作温度： | -40°C ~ 125°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： | 带卷 (TR) |
3-Pin, Ultra-Low-Voltage, Low-Power
μP Reset Circuits
______________Applications Information
Interfacing to μPs with Bidirectional
V CC
Reset Pins
Since the RESET output on the MAX6334 is open-drain,
this device interfaces easily with μPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the μP supervisor’s RESET output directly
to the microcontroller’s (μC’s) RESET pin with a single
pull-up resistor allows either device to assert reset
(Figure 1).
V CC
MAX6334
RESET
GND
V CC
μ P
MOTOROLA
68HCXX
RESET
INPUT
GND
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
Figure 1. Interfacing to μPs with Bidirectional Reset Pins
transients (glitches). The Typical Operating Characteristics
show the Maximum Transient Duration vs. Reset
Comparator Overdrive graph. The graph shows the maxi-
mum pulse width that a negative-going V CC transient may
typically have without issuing a reset signal. As the ampli-
tude of the transient increases, the maximum allowable
pulse width decreases.
V CC
MAX6333
RESET
V CC
MAX6332
RESET
100k*
Ensuring a Valid Reset Output
Down to V CC = 0
When V CC falls below 1V and approaches the minimum
(a)
GND
100k
(b)
GND
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESET pin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
μPs and circuitry do not operate at V CC below 1V. For
the MAX6333, where RESET must be valid down to 0,
adding a pull-down resistor between RESET and GND
*ASSUMES HIGH-Z RESET INPUT TO THE μ P
Figure 2. Ensuring Reset Valid Down to V CC = 0
Table 1. Factory-Trimmed Reset
Thresholds*
removes stray leakage currents, holding RESET low
(Figure 2a). The pull-down resistor value is not critical;
100k ? is large enough not to load RESET and small
enough to pull it low. For the MAX6332, where RESET
must be valid to V CC = 0, a 100k ? pull-up resistor
RESET-
THRESHOLD
SUFFIX
MAX633_UR25D_
MAX633_UR24D_
T A = +25°C
MIN TYP MAX
2.46 2.50 2.55
2.36 2.40 2.44
T A = -40°C to +125°C
MIN MAX
2.43 2.58
2.33 2.47
between RESET and V CC will hold RESET high when
V CC falls below 0.7V (Figure 2b).
Since the MAX6334 has an open-drain, active-low out-
put, it typically uses a pull-up resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non-active level due to the pull-up
MAX633_UR23D_
MAX633_UR22D_
MAX633_UR21D_
MAX633_UR20D_
MAX633_UR19D_
2.26 2.30
2.16 2.20
2.06 2.10
1.96 2.00
1.87 1.90
2.34
2.24
2.14
2.04
1.93
2.23
2.13
2.04
1.94
1.84
2.37
2.27
2.16
2.06
1.96
resistor and the reduced sinking capability of the open-
drain device. Therefore, this device is not recommend-
ed for applications where the RESET pin is required to
be valid down to V CC = 0.
MAX633_UR18D_
MAX633_UR17D_
MAX633_UR16D_
1.77 1.80 1.83
1.67 1.70 1.73
1.57 1.60 1.63
1.75
1.65
1.55
1.85
1.75
1.65
* Factory-trimmed reset thresholds are available in approximately
100mV increments, with a ±1.8% room-temperature variance.
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6334UR25D2 | 制造商:Maxim Integrated Products 功能描述:3-PIN ULTRA-LOW-VOLTAGE LOW-POWER - Rail/Tube |
| MAX6334UR25D2+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.5V 3.3UA 3PIN SOT-23 - Rail/Tube |
| MAX6334UR25D2+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 |
| MAX6334UR25D2-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 |
| MAX6334UR25D3 | 制造商:Maxim Integrated Products 功能描述:3-PIN ULTRA-LOW-VOLTAGE LOW-POWER - Rail/Tube |
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