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參數(shù)資料
| 型號(hào)： | MAX3212* |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +2.7V to +3.6V Powered.1µ.A Supply Current.3-Driver/5-Receiver.True RS-232 Transceiver |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 122K |
AutoS hutdown
A 1μA supply current is achieved with Maxim’s new
AutoShutdown feature, which operates when
FORCEON is low and FORCEOFF is high. When the
MAX3212 senses no valid signal level on any receiver
input for typically 30μs, the on-board power supply and
drivers shut down. Internal 5k
resistors pull the receiv-
er inputs to ground, disabling the transmitters and
reducing supply current to 1μA when the device is in
AutoShutdown mode. This occurs if the RS-232 cable is
disconnected or if the connected peripheral transmit-
ters are turned off. The system turns on again when a
valid level is applied to any RS-232 receiver input. As a
result, the system saves power without changes to the
existing BIOS or operating system. When using the
AutoShutdown feature, INVALID is high when the
device is on and low when the device is shut down. The
INVALID output indicates the condition of the receiver
inputs; INVALID can be used in any mode.
M
+2.7V to +3.6V-Powered, 1μA S upply Current,
3-Driver/5-Rec eiver, True RS -232 Transc eiver
_______________________________________________________________________________________
7
MAX3212
T1OUT
R5OUTB
Tx
5k
UART
V
CC
T1IN
LOGIC
TRANSITION
DETECTOR
R5IN
R5OUT
EN = LOW
SHDN = LOW
V
CC
TO
μ
P
Rx
PREVIOUS
RS-232
Tx
UART
SHDN = LOW
V
CC
V
CC
GND
Rx
5k
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM
ACTIVE RECEIVER OUTPUT IN SHUTDOWN.
b) NEW MAX3212: EN SHUTS DOWN RECEIVER OUTPUTS (EXCEPT FOR R5OUTB)
SONOCURRENT FLOWS TOUART IN SHUTDOWN. R5OUTB INDICATES RECEIVER
ACTIVITY DURING SHUTDOWN WITH EN HIGH.
GND
ESD
PROTECTION
DIODE
ESD
PROTECTION
DIODE
POWER
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
CPU
I/O
CHIP
WITH
UART
MAX3212
RS-232
FORCEOFF
FORCEON
INVALID
Figure 1. Interface Under Control of PMU
Figure 2. Detection of RS-232 Activity when the UART and
Interface Are Shut Down: MAX3212 (b) vs. Previous
Transceivers (a)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3218CAP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| MAX3218 | 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown(1.8~4.25V,自動(dòng)關(guān)閉方式，120kbps，RS-232收發(fā)器) |
| MAX3218CPP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| MAX3218EAP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
| MAX3218EPP | 1レA Supply Current, 1.8V to 4.25V-Powered RS-232 Transceiver with AutoShutdown⑩ |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3212CAI | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CAI+ | 功能描述:RS-232接口集成電路 2.7-3.6V 1uA 3-Drvr 5-Receiver Tsvr RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CAI+T | 功能描述:RS-232接口集成電路 2.7-3.6V 1uA 3-Drvr 5-Receiver Tsvr RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CAI-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3212CWI | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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