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| 型号： | MAX3388ECUG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 250KBPS 24-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/3 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 带卷 (TR) |
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
High Data Rates
The MAX3388E/MAX3389E maintain RS-232-compatible
transmitter output voltages even at high data rates. Figure
5 shows a transmitter loopback test circuit. Figure 6 shows
a loopback test result at 250kbps, and Figure 7 shows the
same test at 460kbps. For Figure 6, all transmitters were
driven simultaneously at 250kbps into RS-232 loads in
parallel with 1000pF. For Figure 7, a single transmitter was
driven at 460kbps, and all transmitters were loaded with
an RS-232 receiver in parallel with 150pF.
Power Switch
The MAX3388E/MAX3389E contain an internal switch
for powering external circuitry. This can be used to
power hot-sync circuitry or other low-power circuitry.
The switch on- resistance is typically 62
. The SWIN
side of the switch is ESD protected to ±15kV.
Logic-Level I/O
In addition to the traditional RS-232 I/O, the
MAX3388E/MAX3389E have a logic-level transceiver
from the RS-232 connector side to the CMOS-logic
side. The input impedance is typically 30k
, and the
output is open drain. The logic level I/O is active during
shutdown for the MAX3389E.
This I/O transceiver is useful for hot syncing or other
dedicated communication capability. The input is ESD
protected to ±15kV.
Typical PDA/Cell-Phone Application
The MAX3388E/MAX3389E designed with PDA applica-
tions in mind. Two transmitters and two receivers handle
standard 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 transmit-
ter, solutions for these applications would require soft-
ware-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 +3.7V 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 generate a regulated out-
put voltage of +2.35V to +3V from the phone connector.
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 MAX3388E/MAX3389E come with a logic power-
supply pin (VL) that limits the logic levels presented to
MAX3388E
MAX3389E
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
CL
Figure 5. Loopback Test Circuit
1
s/div
T1IN
T1OUT
2V/div
5V/div
R1OUT
5V/div
CL = 1000pF
Figure 6. Loopback Test Results at 250kbps
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3388EEUG | 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: |
| MAX3388EEUG+ | 功能描述:RS-232接口集成电路 2.5V 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: |
| MAX3388EEUG+T | 功能描述:RS-232接口集成电路 2.5V 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: |
| MAX3388EEUG-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: |
| MAX3389ECUG | 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: |
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