參數(shù)資料
型號： MAX795S
廠商： Maxim Integrated Products, Inc.
英文描述： Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125
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)： 17/20頁
文件大小： 150K
代理商： MAX795S
timeout period (because PFI is below the PFI thresh-
old), the IC will test the voltage level on PFO, find that it
is low, and incorrectly decide to enter freshness seal
mode. If V
CC
is later removed, the backup battery will
not be connected to OUT and any devices powered by
OUT will lose power.
Applications that do not use the PFO comparator need
not be affected by this problem. Simply connect PFI to
V
CC
and PFO will be driven high during all reset time-
out periods. Freshness seal mode can be entered only
when PFO is low.
The IC is under revision to correct this problem. The
revised IC will disable PFO during all reset timeout peri-
ods including MR-initiated ones. This revision will not
affect applications that either do not use MR or do not
use PFO, but could affect applications that require the
use of the PFO output during MR-initiated reset timeout
periods. The revised ICs are expected to be available
in late 1996. For technical assistance, please contact
Maxim Applications at 1-800-998-8800 or at
http:// www. maxim-ic.com.
M
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
______________________________________________________________________________________
17
MAX793
MAX794
V
CC
GND
0V
TO
μ
P
V
L
= R1
V
PFT
PFI
PFO
R1
R2
R3
*OPTIONAL
C1*
V
IN
V
TRIP
V
IN
PFO
0V
V
H
V
L
R1 + R2
R2
V
H
= (V
PFT
+ V
PFH
) (R1)
V
TRIP
= V
PFT
+
1
+
1
1
–
R3
V
CC
V
PFT
= 1.237V
V
PFH
= 10mV
WHERE
V
CC
GND
TO
μ
P
PFI
PFO
R1
R2
R3
*OPTIONAL
C1*
V
IN
R1 + R2
)
R2
V
H
= R1 (V
PFT
+ V
PFH
)
V
TRIP
= V
PFT
(
+
1
+
1
1
–
R3
V
D
V
PFT
= 1.237V
V
PFH
= 10mV
V
D
= DIODE FORWARD VOLTAGE DROP
V
L
= V
TRIP
WHERE
MAX793
MAX794
0V
PFO
0V
V
H
V
IN
V
TRIP
(b)
(a)
(
)
( )
( )
+
1
+
1
1
( )
Figure 16. Adding Hysteresis to the Power-Fail Comparator: (a) Symmetrical Hysteresis, (b) Hysteresis Only on Rising V
IN
MAX793
MAX794
MAX795
V
CC
GND
V
CC
N
RESET
GENERATOR
GND
V
CC
RESET
RESET
μ
P
Figure 17. Interfacing to μPs with Bidirectional Reset I/O
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相關代理商/技術參數(shù)
參數(shù)描述
MAX795SCPA 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX795SCPA+ 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX795SCSA 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX795SCSA+ 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX795SCSA+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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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