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參數(shù)資料
| 型號(hào)： | MAX794 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 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) |
| 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)： | 8/20頁 |
| 文件大?。?/td> | 211K |
| 代理商： | MAX794 |
M
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
8
_______________________________________________________________________________________
_______________Detailed Desc ription
General T iming Charac teristic s
The MAX793/MAX794/MAX795 are designed for 3.3V
and 3V systems, and provide a number of supervisory
functions (see the Selector Guide on the front page).
Figures 1 and 2 show the typical timing relationships of
the various outputs during power-up and power-down
with typical V
CC
rise and fall times.
Manual Reset Input (MAX 793/MAX 794)
Many microprocessor-based products require manual-
reset capability, allowing the operator, a test technician,
or external logic circuitry to initiate a reset. On the
MAX793/MAX794, a logic low on MR asserts reset. Reset
remains asserted while MR is low, and for t
RP
(200ms)
after it returns high. During the first half of the reset time-
out period (t
RP
), the state of MR is ignored if PFO is exter-
nally forced low, to facilitate enabling the battery fresh-
ness seal. MR has an internal 70μA pull-up current, so it
can be left open if it is not used. This input can be driven
with TTL- or CMOS-logic levels, or with open-drain/collec-
tor outputs. Connect a normally open momentary switch
from MR to GND to create a manual-reset function; exter-
nal debounce circuitry is not required. If MR is driven
from long cables or the device is used in a noisy environ-
ment, connect a 0.1μF capacitor from MR to ground to
provide additional noise immunity.
Reset Outputs
A microprocessor’s (μP’s) reset input starts the μP in a
known state. These MAX793/MAX794/MAX795 μP
supervisory circuits assert a reset to prevent code exe-
cution errors during power-up, power-down, and
V
LOWLINE
(MAX793/MAX794)
V
RESET
(PULLED UP TOV
CC
)
V
RESET
(MAX793/MAX794)
(PFOFOLLOWS PFI)
V
CE OUT
V
BATT
V
WDO
(MAX793/MAX794)
V
BOK
(MAX793)
MAX794: V
RESET IN
= V
CC
(V
RST IN
/ V
RST
)
PFO
(MAX793/MAX794)
BATT ON
SHOWN FOR V
CC
= 0V to 3.3V, V
BATT
= 3.6V, CE IN = GND.
TYPICAL PROPAGATION DELAYS REFLECT A 40mV OVERDRIVE.
5
μ
s
V
SW
V
CC
V
RST
V
LL
t
RP
25
μ
s
25
μ
s
25
μ
s
25
μ
s
t
RP
t
RP
/
2
t
RP
/
2
Figure 1. Timing Diagram, V
CC
Rising
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|---|---|
| MAX794CPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| MAX794CPE+ | 功能描述:監(jiān)控電路 3/3.3/AdjV MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| MAX794CSE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| MAX794CSE+ | 功能描述:監(jiān)控電路 3/3.3/AdjV MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)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 |
| MAX794CSE+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(cè)電壓數(shù): 監(jiān)測(cè)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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