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| 型号： | MAX690RCSA-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 3.0V/3.3V Microprocessor Supervisory Circuits |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 9/12页 |
| 文件大小： | 281K |
| 代理商： | MAX690RCSA-T |
MAX690T/S/R,
704T/S/R,
802T/S/R,
804–806T/S/R
_______________Detailed Description
Reset Output
A microprocessor’s (P’s) reset input starts the P in a
known state. These P 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 < VCC <
VRST, provided that VBATT is greater than 1V. Without
a backup battery,
–
R
—
E
—
S
—
E
—
T
–
is guaranteed valid for VCC
> 1V. Once VCC exceeds the reset threshold, an
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).
If a brownout condition occurs (VCC dips below the
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 VCC 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 (VCC - 14%).
The MAX690R/MAX704R/MAX805R are optimized for
monitoring 3.0V ±10% power supplies. Reset will not
occur until VCC 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.
3.0V/3.3V Microprocessor Supervisory Circuits
6
_______________________________________________________________________________________
______________________________________________________________Pin Description
1
VOUT
Supply Output for CMOS RAM. When VCC is above the reset threshold, VOUT is
connected to VCC through a p-channel MOSFET switch. When VCC falls below VSW and
VBATT, VBATT connects to VOUT. Connect to VCC if no battery is used.
2
VCC
Main Supply Input
3
GND
Ground
4
PFI
Power-Fail Input. When PFI is less than VPFT or when VCC falls below VSW,
–
P
—
F
—
O
–
goes
low; otherwise,
–
P
—
F
—
O
–
remains high. Connect to ground if unused.
7
–
R
—
E
—
S
—
E
—
T
–
Active-Low Reset Output. Pulses low for 200ms when triggered, and stays low whenever
VCC is below the reset threshold or when
–
M
—
R
–
is a logic low. It remains low for 200ms after
either VCC rises above the reset threshold, the watchdog triggers a reset, or
–
M
—
R
–
goes
from low to high.
—
–
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
70A pullup current. It can be driven from a TTL or CMOS logic line, or shorted to ground
with a switch. Leave open if unused.
6
WDI
Watchdog Input. If WDI remains high or low for 1.6s, the internal watchdog timer runs out
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.
5
–
P
—
F
—
O
–
Power-Fail Output. When PFI is less than VPFT, or VCC falls below VSW,
–
P
—
F
—
O
–
goes low;
otherwise,
–
P
—
F
—
O
–
remains high. Leave open if unused.
8
VBATT
Backup-Battery Input. When VCC falls below VSW and VBATT, VOUT switches from VCC to
VBATT. When VCC rises above the reset threshold, VOUT reconnects to VCC. VBATT may
exceed VCC. Connect to VCC if no battery is used.
—
RESET
Active-High, Open-Drain Reset Output is the inverse of
–
R
—
E
—
S
—
E
—
T
–
.
NAME
FUNCTION
MAX690
MAX802
1
2
PIN
3
4
—
6
5
8
7
MAX804
MAX805
1
2
3
4
7
6
—
5
8
—
MAX704
MAX806
相关PDF资料 |
PDF描述 |
|---|---|
| MAX690RESA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690SCSA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690SESA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690TCSA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690TESA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX690REPA | 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 |
| MAX690REPA+ | 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 |
| MAX690RESA | 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 |
| MAX690RESA+ | 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 |
| MAX690RESA+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 |
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