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| 型号： | MAX704SCPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.925V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
3.0V/3.3V Microprocessor Supervisory Circuits
______________________________________________________________Pin Description
PIN
MAX690 MAX704 MAX804
NAME
FUNCTION
MAX802 MAX806 MAX805
Supply Output for CMOS RAM. When V CC is above the reset threshold, V OUT is
1
1
1
V OUT
connected to V CC through a p-channel MOSFET switch. When V CC falls below V SW and
VBATT, VBATT connects to V OUT . Connect to V CC if no battery is used.
Power-Fail Input. When PFI is less than V PFT or when V CC falls below V SW , P F O goes
Power-Fail Output. When PFI is less than V PFT , or V CC falls below V SW , P F O goes low;
2
3
4
5
2
3
4
5
2
3
4
5
V CC
GND
PFI
– — — –
P F O
Main Supply Input
Ground
– — — –
low; otherwise, P F O remains high. Connect to ground if unused.
– — — –
otherwise, P F O remains high. Leave open if unused.
– — — –
– — — –
Watchdog Input. If WDI remains high or low for 1.6s, the internal watchdog timer runs out
6
—
6
WDI
and reset is triggered. The internal watchdog timer clears while reset is asserted or when
WDI sees a rising or falling edge. The watchdog function cannot be disabled.
—
6
—
– — –
M R
– — –
– –
Manual Reset Input. A logic low on M R asserts reset. Reset remains asserted as long as
– — – —
M R is low and for 200ms after M R returns high. This active-low input has an internal
70μA pullup current. It can be driven from a TTL or CMOS logic line, or shorted to ground
with a switch. Leave open if unused.
– — — — — – V CC is below the reset threshold or when M R is a logic low. It remains low for 200ms after
7
7
—
–
R E S E T – —
Active-Low Reset Output. Pulses low for 200ms when triggered, and stays low whenever
– — –
either V CC rises above the reset threshold, the watchdog triggers a reset, or M R goes
from low to high.
—
—
7
RESET
– — — — — –
Active-High, Open-Drain Reset Output is the inverse of R E S E T .
Backup-Battery Input. When V CC falls below V SW and VBATT, V OUT switches from V CC to
8
8
8
VBATT
VBATT. When V CC rises above the reset threshold, V OUT reconnects to V CC . VBATT may
exceed V CC . Connect to V CC if no battery is used.
V RST , provided that VBATT is greater than 1V. Without
> 1V. Once V CC exceeds the reset threshold, an
– — — — — –
If a brownout condition occurs (V CC dips below the
– — — — — –
_______________Detailed Description
Reset Output
A microprocessor’s (μP’s) reset input starts the μP in a
known state. These μP supervisory circuits assert reset to
prevent code execution errors during power-up, power-
down, brownout conditions, or a watchdog timeout.
– — — — — –
R E S E T is guaranteed to be a logic low for 0V < V CC <
– — — — — –
a backup battery, R E S E T is guaranteed valid for V CC
– — — — — –
internal timer keeps R E S E T low for the reset timeout
period; after this interval, R E S E T goes high (Figure 2).
– –
– — — — — – — — — —
reset threshold), R E S E T goes low. Each time R E S E T
is asserted, it stays low for the reset timeout period.
Any time V CC goes below the reset threshold, the
internal timer restarts.
The watchdog timer can also initiate a reset. See the
Watchdog Input section.
The MAX804_/MAX805_ active-high RESET output is
open drain, and the inverse of the MAX690_/MAX704_/
MAX802_/MAX806_ R E S E T output.
Reset Threshold
The MAX690T/MAX704T/MAX805T are intended for
3.3V systems with a ±5% power-supply tolerance and a
10% system tolerance. Except for watchdog faults,
reset will not assert as long as the power supply
remains above 3.15V (3.3V - 5%). Reset is guaranteed
to assert before the power supply falls below 3.0V.
The MAX690S/MAX704S/MAX805S are designed for
3.3V ±10% power supplies. Except for watchdog
faults, they are guaranteed not to assert reset as long
as the supply remains above 3.0V (3.3V - 10%). Reset
is guaranteed to assert before the power supply falls
below 2.85V (V CC - 14%).
The MAX690R/MAX704R/MAX805R are optimized for
monitoring 3.0V ±10% power supplies. Reset will not
occur until V CC falls below 2.7V (3.0V - 10%), but is
guaranteed to occur before the supply falls below
2.59V (3.0V - 14%).
The MAX802R/S/T, MAX804R/S/T, and MAX806R/S/T
are respectively similar to the MAX690R/S/T,
MAX805R/S/T, and MAX704R/S/T, but with tightened
reset and power-fail threshold tolerances.
6
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX704SCPA+ | 功能描述:监控电路 MPU Supervisor 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 |
| MAX704SCSA | 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 |
| MAX704SCSA+ | 功能描述:监控电路 MPU Supervisor 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 |
| MAX704SCSA+T | 功能描述:监控电路 MPU Supervisor 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 |
| MAX704SCSA-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 |
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