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参数资料
| 型号： | MAX3386EEUP |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 250KBPS 20-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 74 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
MAX3386E
3.0V, ±25kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
High Data Rates
The MAX3386E maintains the RS-232 ±5.0V minimum
transmitter output voltage even at high data rates.
Figure 5 shows a transmitter loopback test circuit. Figure 6
shows a loopback test result at 120kbps, and Figure 7
shows the same test at 250kbps. For Figure 6, all transmit-
ters were driven simultaneously at 120kbps into RS-232
loads in parallel with 1000pF. For Figure 7, a single trans-
mitter was driven at 250kbps, and all transmitters were
loaded with an RS-232 receiver in parallel with 1000pF.
Interconnection with
3V and 5V Logic
The MAX3386E can directly interface with various 5V
logic families, including ACT and HCT CMOS. The logic
voltage power-supply pin VL sets the output voltage
level of the receivers and the input thresholds of the
transmitters.
Typical PDA/Cell-Phone Application
The MAX3386E 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 (RI) 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 RI signal is generated when a PDA, cellular phone, or
other “cradled” device is plugged into its cradle. This
generates a logic-low signal to RI transmitter input, creat-
ing +6V at the ring indicate pin. The PC’s UART RI input
is the only pin that can generate an interrupt from signals
arriving through the RS-232 port. The interrupt routine for
this UART will then service the RS-232 full-duplex com-
munication 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 MAX3386E comes with a
logic power-supply pin (VL) that limits the logic levels
presented to the phone. The receiver outputs will sink
to zero for low outputs, but will not exceed VL for logic
highs. The input logic levels for the transmitters are also
altered, scaled by the magnitude of the VL input. The
device will work with VL 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.
MAX3386E
5k
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
VCC
C4
C3
C1
C2
0.1
F
VCC
SHDN
T_ OUT
T_ IN
GND
VCC
1000pF
Figure 5. Loopback Test Circuit
2
s/div
T1IN
T1OUT
R1OUT
5V/div
VCC = +3.3V
Figure 6. Loopback Test Results at 120kbps
_______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| MAX3386EEUP+ | 功能描述:RS-232接口集成电路 3V Transceiver for PDAs & Cells RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3386EEUP+T | 功能描述:RS-232接口集成电路 3V Transceiver for PDAs & Cells RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3386EEUP-T | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3386EIDW | 功能描述:RS-232接口集成电路 RS-232 Line Driver/Receiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3386EIDWG4 | 功能描述:RS-232接口集成电路 RS-232 Line Driver/Receiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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