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參數(shù)資料
| 型號： | MAX793 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有監(jiān)控器、芯片使能和支持備用電池的復(fù)位器) |
| 中文描述： | 3.0V/3.3V可調(diào)、微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 211K |
| 代理商： | MAX793 |
M
The CE transmission gate remains disabled and CE IN
remains high impedance (regardless of CE IN activity)
for the first half of the reset timeout period (t
RP
/ 2), any
time a reset is generated. While disabled, CE IN is
high impedance. When the CE transmission gate is
enabled, the impedance of CE IN appears as a 46
resistor in series with the load at CE OUT.
The propagation delay through the CE transmission
gate depends on V
CC
, the source impedance of the
drive connected to CE IN, and the loading on CE OUT
(see the Chip-Enable Propagation Delay vs. CE OUT
Load Capacitance graph in the Typical Operating
Characteristics). The CE propagation delay is produc-
tion tested from the 50% point on CE IN to the 50%
point on CE OUT using a 50
driver and 50pF of load
capacitance (Figure 9). For minimum propagation
delay, minimize the capacitive load at CE OUT, and
use a low-output-impedance driver.
Chip-Enable Output
When the CE transmission gate is enabled, the imped-
ance of CE OUT is equivalent to a 46
resistor in series
with the source driving CE IN. In the disabled mode,
the transmission gate is off and an active pull-up con-
nects CE OUT to OUT (Figure 8). This pull-up turns off
when the transmission gate is enabled.
Early Power-Fail Warning
(MAX 793/MAX 794)
Critical systems often require an early warning indicat-
ing that power is failing. This warning provides time for
the μP to store vital data and take care of any additional
“housekeeping” functions, before the power supply
gets too far out of tolerance for the μP to operate reli-
ably. The MAX793/MAX794 offer two methods of
achieving this early warning. If access to the unregu-
lated supply is feasible, the power-fail comparator input
(PFI) can be connected to the unregulated supply
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
12
______________________________________________________________________________________
CHIP-ENABLE
OUTPUT
CONTROL
CE OUT
N
P
P
OUT
CE IN
MAX793
MAX794
MAX795
RESET
GENERATOR
Figure 7. Chip-Enable Transmission Gate
V
BATT
V
CC
V
RST
V
RST
V
SW
V
RST
V
CC
CE OUT
RESET
(PULLED TOV
CC
)
CE IN
V
BATT
= 3.6V
RESET PULLED UP TOV
CC
t
RP
10
μ
s
t
RP
/
2
V
BATT
V
SW
V
RST
Figure 8. Chip-Enable Timing
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX794 | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有可調(diào)閾值監(jiān)控器、芯片使能和支持備用電池的復(fù)位器) |
| MAX796 | Step-Down Controllers with Synchronous Rectifier for CPU Power(3.3V/5V/可調(diào),帶有同步整流器的PWM步降控制器，用于筆記本電腦) |
| MAX797 | Step-Down Controllers with Synchronous Rectifier for CPU Power(3.3V/5V/可調(diào),帶有同步整流器的PWM步降控制器，用于筆記本電腦) |
| MAX797CPE | Octal Bus Transceivers With 3-State Outputs 20-CDIP -55 to 125 |
| MAX796-MAX799 | Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX793RCPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX793RCPE+ | 功能描述:監(jiān)控電路 3/3.3/AdjV MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX793RCSE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX793RCSE+ | 功能描述:監(jiān)控電路 3/3.3/AdjV MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX793RCSE+T | 功能描述:監(jiān)控電路 3/3.3/AdjV MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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