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參數(shù)資料
| 型號： | 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)： | 7/14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
_______________________________________________________________________________________
7
Detailed Description
Dual Charge-Pump
Voltage Converter
The MAX3387E’s internal power supply consists of a
regulated dual charge pump that provides output volt-
ages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), regardless of the input volt-
age (V
CC
) over a +3.0V to +5.5V range. The charge
pumps operate in a discontinuous mode: if the output
voltages are less than 5.5V, the charge pumps are
enabled; if the output voltages exceed 5.5V, the charge
pumps are disabled. Each charge pump requires a fly-
ing capacitor (C1, C2) and a reservoir capacitor (C3,
C4) to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3387E transmitters guarantee a 250kbps data
rate with worst-case loads of 3k
in parallel with
1000pF, providing compatibility with PC-to-PC commu-
nication software (such as LapLink). Transmitters can
be paralleled to drive multiple receivers or mice. Figure 1
shows a complete system connection.
These RS-232 output stages are turned off (high imped-
ance) when the device is in shutdown mode. When the
power is off, the MAX3387E permits the outputs to be
driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or V
L
.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3387E’s receivers are always
active, even when the device is in shutdown.
The MAX3387E features an
INVALID
output that indi-
cates when no signal is present on any RS-232 receiver
inputs.
INVALID
is independent of other control logic
functions; it indicates the receiver input conditions only
(Figures 2 and 3).
MAX3387E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
V
L
V
CC
I/O CHIP
POWER SUPPLY
FORCEOFF
FORCEON
INVALID
Figure 1. Interface Under Control of PMU
LapLink is a trademark of Traveling Software.
+0.3V
-0.3V
INVALID
R_IN
TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1
μ
A IF
ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR
AT LEAST
30
μ
s.
30
μ
s
COUNTER
R
+2.7V
-2.7V
INVALID
R_IN
TRANSMITTERS ARE ENABLED IF:
ANY RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V;
ANY RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR
LESS THAN
30
μ
s.
30
μ
s
COUNTER
R
Figure 2a.
INVALID
Function Diagram,
INVALID
= Low
Figure 2b.
INVALID
Function Diagram,
INVALID
= High
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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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