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參數(shù)資料
| 型號(hào)： | MAX3387E |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | +3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins I1(+3.0V至+5.5V,10nA,帶 ±15kV ESD保護(hù)接口和邏輯引腳，250kbps RS-232 收發(fā)器（3收3發(fā)）) |
| 中文描述： | 3V、±15kV ESD保護(hù)、AutoShutdown Plus RS-232收發(fā)器，用于PDA和蜂窩電話 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 237K |
| 代理商： | MAX3387E |
M
3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
8
_______________________________________________________________________________________
AutoShutdown Plus Mode
The MAX3387E achieves a1μAsupply current with
Maxim’s AutoShutdown Plus feature, which operates
when
FORCEOFF
is high and a FORCEON is low. When
these devices do not sense a valid signal transition on
any receiver and transmitter input for 30sec, the on-
board charge pumps are shut down, reducing supply
current to 1μA. This occurs if the RS-232 cable is dis-
connected or if the connected peripheral transmitters
are turned off, and if the UART driving the transmitter
inputs is inactive. The system turns on again when a
valid transition is applied to any RS-232 receiver or
transmitter input. As a result, the system saves power
without changes to the existing BIOS or operating sys-
tem.
Figures 2a and 2b show valid and invalid RS-232
receiver voltage levels.
INVALID
indicates the receiver
input’s condition, and is independent of FORCEON and
FORCEOFF
states. Figure 2 and Table 1 summarize the
MAX3387E’s operating modes. FORCEON and
FORCE-
OFF
override AutoShutdown Plus circuitry. When nei-
ther control is asserted, the IC selects between these
states automatically based on the last receiver or trans-
mitter input edge received.
By connecting FORCEON to
INVALID
, the MAX3387E
shuts down when no valid receiver level and no receiver or
transmitter edge is detected for 30sec, and wakes up
when a valid receiver level or receiver or transmitter
edge is detected.
By connecting FORCEON and
FORCEOFF
to
INVALID
,
the MAX3387E shuts down when no valid receiver level
is detected.
A mouse or other system with AutoShutdown Plus may
need time to wake up. Figure 4 shows a circuit that
forces the transmitters on for 100ms, allowing enough
time for the other system to realize that the MAX3387E
is awake. If the other system outputs valid RS-232 sig-
nal transitions within that time, the RS-232 ports on both
systems remain enabled.
V
L
Logic Supply Input
Unlike other RS-232 interface devices where the receiv-
er outputs swing between 0 and V
CC
, the MAX3387E
features a separate logic supply input (V
L
) that sets
V
OH
for the receiver outputs and sets thresholds for the
receiver inputs. This feature allows a great deal of flexi-
bility in interfacing to many different types of systems
with different logic levels. Connect this input to the host
logic supply (1.8V
≤
V
L
≤
V
CC
). Also, see the
Typical
PDA/Cell-Phone Application
section.
POWERDOWN
AUTOSHDN
FORCEOFF
FORCEON
POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE
OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 2c. AutoShutdown Plus Logic
R
-2.7V
-0.3V
+2.7V
+0.3V
0V
INDETERMINATE
TRANSMITTERS ENABLED, INVALID HIGH
AutoShutdown, TRANSMITTERS DISABLED,
1
μ
A SUPPLY CURRENT, INVALID LOW
TRANSMITTERS ENABLED, INVALID HIGH
INDETERMINATE
Figure 3a. Receiver Thresholds for
INVALID
AUTOSHDN
R_IN
T_IN
R
S
30s
TIMER
EDGE
DETECT
EDGE
DETECT
FORCEOFF
FORCEON
Figure 2d. Power-Down Logic
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3387ECUG | 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: |
| MAX3387ECUG+ | 功能描述:RS-232接口集成電路 3V Transceiver for PDAs & Cells 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: |
| MAX3387ECUG+ | 制造商:Maxim Integrated Products 功能描述:IC RS-232 TXRX 250KBPS 5.5V TSSOP-24 |
| MAX3387ECUG+T | 功能描述:RS-232接口集成電路 3V Transceiver for PDAs & Cells 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: |
| MAX3387ECUG-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: |
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