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| 型号： | MAX3386EEUP |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11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
6
_______________________________________________________________________________________
Detailed Description
Dual Charge-Pump
Voltage Converter
The MAX3386E’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 voltage
(VCC) 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 flying 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 convert
CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3386E’s transmitters guarantee a 250kbps data
rate with worst-case loads of 3k
in parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink). Transmitters can be paral-
leled to drive multiple receivers or mice. Figure 1 shows a
complete system connection.
These RS-232 output stages are turned off (high
impedance) when the device is in shutdown mode.
When the power is off, the MAX3386E permits the outputs
to be driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or VL.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3386E’s receivers have inverting
three-state outputs, which depend on the shutdown
state of the device.
Shutdown Mode
Supply current falls to less than 1A when the MAX3386E
is placed in shutdown mode (SHDN logic low). When
shut down, the device’s charge pumps are turned off, V+
decays to VCC, V- is pulled to ground, and the transmitter
outputs are disabled (high impedance). The time
required to exit shutdown is typically 100s, as shown in
Figure 2. Connect SHDN to VCC if the shutdown mode
is not used. In shutdown mode, the receiver outputs are
high impedance (Table 1).
MAX3386E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
SHDN
VL
VCC
I/O CHIP
POWER SUPPLY
Figure 1. Interface Under Control of PMU
LapLink is a trademark of Traveling Software.
50
s/div
T2
T1
5V/div
2V/div
VCC = 3.3V
C1–C4 = 0.1
F
Figure 2. Transmitter Outputs when Exiting Shutdown
Table 1. Shutdown Logic Truth Table
TRANSMITTER
OUTPUTS
Inactive
L
High-Z
CHARGE
PUMP
Active
H
Active
High-Z
SHDN
RECEIVER
OUTPUTS
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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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