Dallas, Tex. Texas Instruments Inc. is sampling three new RS-232 devices with system-level IEC 61000-4-2 ESD protection.
By integration IEC 61000-4-2 protection onto the devices (part numbers MAX3243E, MAX3232E and MAX3227), the RS-232 interface is immune to damage caused by ESD strikes while the system is up and running.
The MAX3243E, MAX3232E and MAX3227 also eliminate the need for external IEC ESD protection devices, saving board manufacturers cost in assembly and board space.
The IEC 61000-4-2 ESD specification is one of the industry’s most stringent ESD testing methodologies to address system-level immunity to malfunction and/or damage during an ESD strike while equipment is in use. In comparison, other ESD tests standards, such as HBM (human body model), MM (machine model) and CDM (charged discharge model), are performed with the device powered down.
The stress conditions associated with the IEC ESD specification are higher than the device-level ESD tests. For example, peak current for IEC 61000-4-2 ESD strike is five times greater than the peak current for the HBM ESD strike, according to the company.
TI's MAX3243E and MAX3232E are compliant up to level 4 (±8 kV contact discharge and ±15 kV air gap discharge), and MAX3227, performs better than the level 3 specification (±6 kV contact and ±8 kV air gap) devices. As a result, they meet the requirements for low-power, high-speed applications, such as portable/consumer equipment, telecom, and computing applications.
Meeting most RS-232 communication needs, the devices consume just 1-µA during power-down mode, provide a data-rate speed of up to 1-Mbits/s, and feature 5.5-V-tolerant inputs.
The MAX3243E is available in 28-pin TSSOP, SSOP, SOIC and QFN packages, which are all RoHS compliant. Budgetary pricing for the PAX3243E is set at $1.28 for commercial temperature grade and $1.57 for industrial temperature grade in quantities of 1,000.
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Texas Instruments Inc. 1-972-644-5580, www.ti.com.