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| 型号： | MAX13237EETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | TXRX RS-232 3MBPS 1X1 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 托盘 |
| 产品目录页面： | 1408 (CN2011-ZH PDF) |
MAX13234E–MAX13237E
3Mbps RS-232 Transceivers with
Low-Voltage Interface
10
______________________________________________________________________________________
Detailed Description
VL Logic Supply Input
The MAX13234E–MAX13237E feature a separate logic
supply input (VL) that sets the receiver’s output level
(VOH), and sets the transmitter’s input thresholds (VIL,
VIH). This feature allows flexibility in interfacing to
UARTs or communication controllers that have different
logic levels. Connect this input to the host logic supply
(1.62V ≤ VL ≤ VCC).
Dual Charge-Pump Voltage Converter
The internal power supply consists of a regulated dual
charge pump that provides output voltages of +5.5V
and -5.5V (inverting charge pump), over the +3.0V to
+5.5V range. The charge pump operates in discontinu-
ous mode: if the output voltages are less than +5.5V,
the charge pump is enabled; if the output voltages
exceed +5.5V, the charge-pump is disabled. The
charge pumps require flying capacitors (C1, C2) and
reservoir capacitors (C3, C4) to generate the V+ and V-
supplies. The READY output is low when the charge
pumps are disabled in shutdown mode. The READY
signal asserts high when V- goes below -4V.
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to ±5.0V EIA/TIA-232 levels.
The MAX13234E/MAX13236E guarantee a 250kbps
data rate with worst-case loads of 3k in parallel with
1000pF. The MAX13235E/MAX13237E guarantee a
1Mbps data rate with worst-case loads of 3k in paral-
lel with 250pF, and a 3Mbps data rate with worst-case
loads of 3k in parallel with 150pF. Transmitters can be
paralleled to drive multiple receivers. When FORCEOFF
is driven to ground or when the AutoShutdown Plus cir-
cuitry senses that all receiver and transmitter inputs are
inactive for more than 30s, the transmitters are disabled
and the outputs go into a high-impedance state. When
powered off or shut down, the outputs can be driven to
±12V. The transmitter inputs do not have pullup resis-
tors. Connect unused inputs to GND or VL.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX13234E–MAX13237E have
inverting outputs that are active when in shutdown
(FORCEOFF = GND) (Table 1).
AutoShutdown Plus Mode
Drive FORCEOFF high and FORCEON low to invoke
AutoShutdown Plus mode. When these devices do not
sense a valid signal transition on any receiver and
transmitter input for 30s, the onboard charge pumps
are shut down, reducing supply current to 1A. This
occurs if the RS-232 cable is disconnected or
if the devices driving the transmitter and receiver
inputs are inactive for more than 30s. The
MAX13234E–MAX13237E turn on again when a valid
transition is applied to any RS-232 receiver or transmit-
ter input. As a result, the system saves power without
requiring any control.
Figure 6 and Table 1 summarize the MAX13234E–
MAX13237E operating modes. The FORCEON and
FORCEOFF inputs override AutoShutdown Plus circuit-
ry. When neither control is asserted, the IC selects
between these states automatically based on the last
receiver or transmitter input edge received.
Hardware-Controlled Shutdown
Drive FORCEOFF low to place the MAX13234E–
MAX13237E into shutdown mode.
FORCEON
MASTER SHDN LINE
0.1F1M
FORCEOFF
MAX13234E
MAX13235E
MAX13236E
MAX13237E
POWER-
MANAGEMENT
UNIT
Figure 7. AutoShutdown Plus Initial Turn-On to Wake Up a
Mouse or Another System
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX13237EETE+ | 功能描述:RS-232接口集成电路 3-5.5V 3Mbps RS232 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: |
| MAX13237EETE+T | 功能描述:RS-232接口集成电路 3-5.5V 3Mbps RS232 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: |
| MAX13237EETE-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: |
| MAX1323ECM | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1323ECM+ | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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