MAX3218：1µA、1.8V至4.25V、RS-232收发器，带有AutoShutdown™

The MAX3218 RS-232 transceiver is intended for battery-powered EIA/TIA-232E and V.28/V.24 communications interfaces that need two drivers and two receivers with minimum power consumption from a single low-voltage supply. It provides a wide +1.8V to +4.25V operating voltage range while maintaining true RS-232 and EIA/TIA-562 voltage levels. The MAX3218 runs from two alkaline, NiCd, or NiMH cells without any form of voltage regulator. A guaranteed 120kbps data rate provides compatibility with popular software for communicating with personal computers. Supply current is reduced to 1µA with Maxim's new AutoShutdown feature. When the MAX3218 does not sense a valid signal level on the receiver inputs, the on-board power-supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The system turns on again when a valid level is applied to either RS-232 receiver input. As a result, the system saves power without changes to the existing software. Additionally, the MAX3218 can be forced into or out of shutdown, under logic control. While shut down, all receivers can remain active or can be disabled under logic control, permitting a system incorporating the CMOS MAX3218 to monitor external devices while in low-power shutdown. Three-state drivers are provided on both receiver outputs so that multiple receivers, generally of different interface standards, can be on the same bus. The MAX3218 is available in 20-pin DIP and SSOP packages.

关键特性

1µA Supply Current Using AutoShutdown
Operates Directly from Two Alkaline, NiCd or NiMH Cells
+1.8V to +4.25V Single-Supply Voltage Range
120kbps Data Rate Guaranteed
Low-Cost Surface-Mount Components
Meets EIA/TIA-232E Specifications
Three-State Receiver Outputs
Flow-Through Pinout
On-Board DC-DC Converters
20-Pin SSOP and DIP Packages

MAX3218：典型工作电路

应用

电池供电应用
蜂窝电话
手持式装置
PDA
外设
亚笔记本电脑

数据手册DataSheet

语言	下载文件	备注
英文	MAX3218.pdf	Rev 0; 03/1995

关键参数

Part Number	V_SUPPLY (V)	Tx	Rx	Data Rate (kbps)	I_CC (mA)	Internal Charge Pump	Ext. Caps	Cap. Value (µF)	Rx Active in Shutdn	Package/Pins	Budgetary Price
Part Number	V_SUPPLY (V)	Tx	Rx	min	typ	Internal Charge Pump	Ext. Caps	nom	Rx Active in Shutdn	Package/Pins	See Notes
MAX3218	1.8	2	2	120	2	Yes	2	0.33/0.68	2	PDIP(N)/20 SOIC(W)/20 SSOP/20	$2.87 @1k

技术资料

质量和环境数据

MAX3218.pdf

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX3218C/D	停止供货		DICE SALES,；NA引脚；DICE；	0°C至+70°C	参考数据资料
MAX3218CAP	停止供货	MAX3218CAP+	SSOP,；20引脚；57.9mm²	0°C至+70°C	RoHS/无铅：否
MAX3218CAP+	生产中		SSOP,；20引脚；57.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX3218CAP+T	生产中		SSOP,；20引脚；57.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX3218CAP-T	停止供货	MAX3218CAP+T	SSOP；20引脚	0°C至+70°C	参考数据资料
MAX3218CPP	停止供货	MAX3218CPP+	PDIP(N),；20引脚；219.2mm²	0°C至+70°C	RoHS/无铅：否
MAX3218CPP+	生产中		PDIP(N),；20引脚；219.2mm²	0°C至+70°C	RoHS/无铅：无铅
MAX3218CWP	停止供货	MAX3218CWP+	SOIC(W),；20引脚；138.5mm²	0°C至+70°C	RoHS/无铅：否
MAX3218CWP+	生产中		SOIC(W),；20引脚；138.5mm²	0°C至+70°C	RoHS/无铅：无铅
MAX3218CWP+T	停止供货		W.SO；	0°C至+70°C	参考数据资料
型号	状况	推荐替代产品	封装：类型引脚占位面积封装图编码/变更 *	温度	RoHS/无铅？
MAX3218CWP-T	停止供货		W.SO；20引脚	0°C至+70°C	参考数据资料
MAX3218EAP	停止供货	MAX3218EAP+	SSOP,；20引脚；57.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX3218EAP+	生产中		SSOP,；20引脚；57.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX3218EAP+T	生产中		SSOP,；20引脚；57.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX3218EAP-T	停止供货	MAX3218EAP+T	SSOP；20引脚	-40°C至+85°C	参考数据资料
MAX3218EPP	停止供货		PDIP(N),；20引脚；219.2mm²	-40°C至+85°C	RoHS/无铅：否
MAX3218EWP	停止供货		SOIC(W),；20引脚；138.5mm²	-40°C至+85°C	RoHS/无铅：否
MAX3218EWP-T	停止供货		W.SO；	-40°C至+85°C	参考数据资料