General Description
The MAX4508/MAX4509 are 8-to-1 and dual 4-to-1 fault-
protected multiplexers that are pin compatible with the
industry-standard DG508/DG509. The MAX4508/
MAX4509 operate with dual supplies of ±4.5V to ±20V or
a single supply of +9V to +36V. These multiplexers fea-
ture fault-protected inputs, rail-to-rail signal handling
capability, and overvoltage clamping at 150mV beyond
the rails.
Both parts offer ±40V overvoltage protection with sup-
plies off and ±25V protection with supplies on. On-
resistance is 400Ωmax and is matched between
channels to 15Ωmax. All digital inputs have TTL logic
thresholds, ensuring both TTL and CMOS logic com-
patibility when using a single +12V supply or dual ±15Vsupplies.
Applications
Data-Acquisition Systems
Industrial and Process Control
Avionics
Signal Routing
Redundant/Backup SystemsFeatures
________________General DescriptionThe MAX4617/MAX4618/MAX4619 are high-speed, low-voltage, CMOS analog ICs configured as an 8-channelmultiplexer (MAX4617), two 4-channel multiplexers(MAX4618), and three single-pole/double-throw (SPDT)switches (MAX4619).These CMOS devices can operate continuously with a+2V to +5.5V single supply. Each switch can handleRail-to-Rail®analog signals. The off-leakage current isonly 1nA at TA= +25°C and 10nA at TA= +85°C.All digital inputs have 0.8V to 2.4V logic thresholds,ensuring TTL/CMOS-logic compatibility when using asingle +5V supply.
________________________ApplicationsBattery-Operated EquipmentAudio/Video Signal RoutingLow-Voltage Data-Acquisition SystemsCommunications Circuits____________________________FeaturesoFast Switching Times 15ns tON10ns tOFFoPin Compatible with Industry-Standard 74HC4051/74HC4052/74HC4053 andMAX4581/MAX4582/MAX4583oGuaranteed On-Resistance 10Ωmax (+5V Supply)20Ωmax (+3V Supply)oGuaranteed 1Ω On-Resistance Match BetweenChannels (single +5V supply)oGuaranteed Low Off-Leakage Current:1nA at +25°C oGuaranteed Low On-Leakage Current:1nA at +25°C o+2V to +5.5V Single-Supply OperationoTTL/CMOS-Logic CompatibleoLow Crosstalk: <-96dB oHigh Off-Isolation: <-93dBoLow Distortion: <0.017% (600Ω)
MAX485中文资料
2009-11-28 14:49
MAX485中文资料，MAX485 PDF,DATASHEET,电路图，通讯程序内容介绍： MAX481、MAX483、MAX485、MAX487-MAX491以及MAX1487是用于RS-485与RS-422通信的低功耗收发器，每个器件中都具有一个驱动器和一个接收器。MAX483、MAX487、MAX488以及MAX489具有限摆率驱动器，可以减小EMI，并降低由不恰当的终端匹配电缆引起的反射，
实现最高250kbps 的无差错数据传输。MAX481、MAX485、MAX490、MAX491、MAX1487的驱动器摆率不受限制，可以实现最高2.5Mbps的传输速率。这些收发器在驱动器禁用的空载或满载状态下，吸取的电源电流在120(A 至500(A 之间。另外，MAX481、MAX483与MAX487具有低电流关断模式， 仅消耗0.1µA。所有器件都工作在5V单电源下。
驱动器具有短路电流限制，并可以通过热关断电路将驱动器输出置为高阻状态，防止过度的功率损耗。接收器输入具有失效保护特性，当输入开路时，可以确保逻辑高电平输出。
MAX481,MAX483,MAX485,MAX487,MAX1487引脚（管脚）图及工作电路
MAX485通讯程序与MAX232通讯程序在本质上是一样的，只是MAX485通讯程序需要加上通讯方向控制。下面是基于mega128 16AU的485通信中断接收的程序，调试通过,晶振为外部16M,MAX485的DE和RE短接连PC0口，
程序如下：
#define SEND_485 PORTC|=0x01
#define READ_485 PORTC&=0xfe
void Usart1_init(void) //16Mhz频率，设置波特率9.6k，8位数据位，无校验，接收发送使能，1位停止位
_______________General DescriptionThe MAX4514/MAX4515 are single-pole/single-throw(SPST), CMOS, low-voltage, single-supply analogswitches with very low switch on-resistance. TheMAX4514 is normally open (NO). The MAX4515 is nor-mally closed (NC).These CMOS switches can operate continuously with asingle supply between +2V and +12V. Each switch canhandle rail-to-rail analog signals. The off-leakage cur-rent maximum is only 1nA at +25°C or 20nA at +85°C.All digital inputs have 0.8V to 2.4V logic thresholds,ensuring TTL/CMOS-logic compatibility when using a+5V supply.For pin-compatible parts for use with dual supplies, seethe MAX4516/MAX4517.________________________ApplicationsBattery-Operated EquipmentAudio and Video Signal RoutingLow-Voltage Data-Acquisition SystemsCommunications CircuitsPCMCIA CardsCellular PhonesModems____________________________FeaturesoAvailable in SOT23-5 Packageo+2V to +12V Single-Supply OperationoGuaranteed On-Resistance:20Ωwith +5V Supply10Ωwith +12V SupplyoGuaranteed Low Off-Leakage Currents:1nA at +25°C20nA at +85°CoGuaranteed Low On-Leakage Currents:2nA at +25°C40nA at +85°CoLow Charge Injection: 10pCoFast Switching Speed: tON= 150ns, tOFF= 100nsoBreak-Before-Make Operation: tON> tOFFat +5VoTTL/CMOS-Logic Compatible with +5V SupplyMAX4514/MAX4515Low-Voltage, Low-On-Resistance,SPST, CMOS Analog Switches
