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參數(shù)資料
| 型號： | MAX3387 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual LVDS Receiver 8-MSOP -40 to 85 |
| 中文描述： | 3V的，【15kV ESD保護(hù)，AutoShutdown加的RS - 232收發(fā)器，PDA和手機(jī)電話 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 181K |
| 代理商： | MAX3387 |
M
3V, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
______________________________________________________________________________________
13
Typical PDA/Cell-Phone Application
The MAX3387E is designed with PDA applications in
mind. Two transmitters and two receivers handle stan-
dard full-duplex communication protocol, while an extra
transmitter allows a ring indicator signal to alert the
UART on the PC. Without the ring indicator transmitter,
solutions for these applications would require software-
intensive polling of the cradle inputs.
The ring indicate (RI) signal is generated when a PDA,
phone, or other “cradled” device is plugged into its cradle.
This generates a logic-low signal to the RI transmitter
input, creating +6V at the ring indicate pin. The PC’s
UART RI input is the only pin that can generate an inter-
rupt from signals arriving through the RS-232 port. The
interrupt routine for this UART will then service the RS-
232 full-duplex communication between the PDA and
the PC.
As cell phone design becomes more like that of PDAs,
cell phones will require similar docking ability and com-
munication protocol. Cell phones operate on a single
lithium-ion (Li+) battery and work with a power-supply
voltage of +2.7V to +4V. The baseband logic coming
from the phone connector can be as low as 1.8V at the
transceivers. To prevent forward biasing of a device
internal to the cell phone, the MAX3387E comes with a
logic power-supply pin (V
L
) that limits the logic levels
presented to the phone. The receiver outputs will sink
to zero for low outputs, but will not exceed V
L
for logic
highs. The input logic levels for the transmitters are also
altered, scaled by the magnitude of the V
L
input. The
device will work with V
L
as low as 1.8V before the
charge-pump noise will begin to cause the transmitter
outputs to oscillate. This is useful with cell phones and
other power-efficient devices with core logic voltage
levels that go as low as 1.8V.
2
μ
s/div
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
V
CC
= 3.3V
Figure 10. Loopback Test Results at 250kbps
Chip Information
TRANSISTOR COUNT: 1267
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX3388EEUG | 2.5V, 【15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones |
| MAX3389EEUG | 2.5V, 【15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones |
| MAX3388E | Dual LVDS Receiver 8-MSOP -40 to 85 |
| MAX3388ECUG | Dual LVDS Receiver 8-MSOP-PowerPAD -40 to 85 |
| MAX3389ECUG | Dual LVDS Receiver 8-MSOP-PowerPAD -40 to 85 |
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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