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参数资料
| 型号： | MAX6803US45D1+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 4-Pin, Low-Power µP Reset Circuits with Manual Reset |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封装： | SOT-143, 4 PIN |
| 文件页数： | 4/8页 |
| 文件大小： | 155K |
| 代理商： | MAX6803US45D1+T |
MAX6803/MAX6804/MAX6805
4-Pin, Low-Power
P Reset Circuits with Manual Reset
4
_______________________________________________________________________________________
Pin Description
Applications Information
Manual Reset Input
Many P-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 reset. Reset remains asserted while MR is low,
and for the reset active timeout period after MR returns
high. MR has an internal 20k
pullup resistor, so it can
be left unconnected if not used. Connect a normally
open momentary switch from MR to GND to create a
manual reset function; external debounce circuitry is
not required.
Interfacing to Ps with
Bidirectional Reset Pins
Since the RESET output on the MAX6805 is open-drain,
this device interfaces easily with Ps that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the P supervisor’s RESET output directly
to the microcontroller’s (C’s) RESET pin with a single
pullup resistor allows either device to assert reset
(Figure 1).
Negative-Going VCC Transients
In addition to issuing a reset to the P during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
VCC transients (glitches). The Typical Operating
Characteristics show the Maximum Transient Duration
vs. Reset Comparator Overdrive graph. The graph
shows the maximum pulse width that a negative-going
VCC transient may typically have without issuing a reset
signal. As the amplitude of the transient increases, the
maximum allowable pulse width decreases.
Ensuring a Valid Reset Output
down to VCC = 0
When VCC falls below 1V and approaches the minimum
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
VCC
GND
MAX6805
RESET
MR
VCC
GND
RESET
MOTOROLA
68HCXX
P
100k
Figure 1. Interfacing to Ps with Bidirectional Reset Pins
PIN
MAX6803
MAX6804
MAX6805
NAME
FUNCTION
1
GND
Ground
—
2
RESET
Active-Low Reset Output. RESET is asserted while VCC is below the reset
threshold, or while MR is asserted. RESET remains asserted for a reset
timeout period (tRP) after VCC rises above the reset threshold or MR is
deasserted. RESET on the MAX6804 is push/pull. RESET on the MAX6805
is open-drain.
Active-High Reset Output. RESET is asserted high while VCC is below the
reset threshold or while MR is asserted, and RESET remains asserted for a
reset timeout period (tRP) after VCC rises above the reset threshold or MR
is deasserted. RESET on the MAX6803 is push/pull.
RESET
—
2
3
MR
Manual Reset Input. A logic low on MR asserts reset. Reset remains
asserted as long as MR is low, and for the reset timeout period (tRP) after
MR goes high. Leave unconnected or connect to VCC if not used.
Supply Voltage Input
VCC
4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6803US45D2 | 制造商:Maxim Integrated Products 功能描述:4-PIN LOW-POWER MICROPROCESSOR RES - Rail/Tube |
| MAX6803US45D2+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.5V 5UA 4PIN SOT-143 - Rail/Tube |
| MAX6803US45D2+T | 功能描述:监控电路 Single uPower 4-Pin 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 |
| MAX6803US45D2-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 |
| MAX6803US45D3 | 制造商:Maxim Integrated Products 功能描述:4-PIN LOW-POWER MICROPROCESSOR RES - Rail/Tube |
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