Intersil's ISL4241E, ISL4243E devices are 2. 7V to 5. 5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V. 28/V. 24 specifications, even at VCC = 3. 0V. Additionally, they provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and automatic power-down functions, reduce the standby supply current to a 10nA trickle. Tiny 5mmx5mm Quad Flat No-Lead (QFN) packaging and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. The ISL4241E, ISL4243E's are 3 driver, 5 receiver devices that, coupled with the 5x5 QFN package, provide the industry's smallest, lowest power complete serial port suitable for PDAs, and laptop or notebook computers. The 32 Ld 5X5 QFN requires 60% less board area than a 28 Ld TSSOP, and is nearly 20% thinner. The devices also include a noninverting always-active receiver for wake-up capability. The ISL4243E features an automatic power-down function that powers down the on-chip power-supply and driver circuits. This occurs when an attached peripheral device is shut off or the RS-232 cable is removed, conserving system power automatically without changes to the hardware or operating system. It powers up again when a valid RS-232 voltage is applied to any receiver input. Table 1 summarizes the features of both the ISL4241E and ISL4243E, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.

Features

  • Pb-Free Available (RoHS compliant)
  • Parameters Fully Specified for 10% Tolerance Supplies and Full Industrial Temp Range
  • Available in Small QFN (5mmx5mm) Package which is 60% Smaller than a 28 Lead TSSOP
  • ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
  • Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
  • RS-232 Compatible with VCC = 2.7V
  • On-Chip Voltage Converters Require Only Four External 0.1µF Capacitors
  • Manual and Automatic Power-down Features
  • Receiver Hysteresis For Improved Noise Immunity
  • Guaranteed Minimum Data Rate: 250kbps
  • Wide Power Supply Range: Single +2.7V to +5.5V
  • Low Supply Current in Power-down State: 10nA

Applications

  • Any Space Constrained System Requiring RS-232 Ports Battery Powered, Hand-Held, and Portable Equipment Laptop Computers, Notebooks PDAs and Palmtops, Data Cables Cellular/Mobile Phones, Digital Cameras, GPS

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 60
Availability
Active QFN Reel 6000
Availability

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL4241E, ISL4243E Datasheet Datasheet PDF 674 KB
Application Notes & White Papers
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Application Note PDF 178 KB
How to Simplify Industrial PC Interfaces 简体中文 White Paper PDF 920 KB
AN1992: Isolating RS-232 Interfaces with High-Speed Digital Optocouplers Application Note PDF 395 KB
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses Application Note PDF 443 KB
AN1986: External Fail-Safe Biasing of RS-485 Networks Application Note PDF 582 KB
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E Application Note PDF 335 KB
AN1989: RS-422 vs RS-485: Similarities and Key Differences Application Note PDF 440 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers Application Note PDF 369 KB
AN1976: Important Transient Immunity Tests for RS-485 Networks Application Note PDF 338 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers Application Note PDF 500 KB
AN1977: Transient Voltage Suppressors: Operation and Features Application Note PDF 365 KB
AN1980: Ground Potential Differences: Origin and Remedies Application Note PDF 375 KB
AN9863: 3V to +5.5V, 250k-1Mbps, RS-232 Transmitters/Receivers Application Note PDF 372 KB
PCNs & PDNs
PCN14011 - Alternate Manufacturing Facilities for Assembly of the Listed Intersil DFN/TDFN/QFN Packaged Products -Carsem (CAS) - Ipoh, Malaysia Product Change Notice PDF 225 KB
Downloads
isl4243e Model IBS 59 KB
Other
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) Other PDF 293 KB
TB389: PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages Other PDF 958 KB
TB379: Thermal Characterization of Packaged Semiconductor Devices Other PDF 653 KB