The ISL3232E, ISL4221E, and ISL4223E devices are 2. 7V to 5. 5V powered RS-232 transmitters/receivers that meet ElA/TIA-232 and V. 28/V. 24 specifications, even at VCC = 3. 0V. 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 hand-held products where the low operational power consumption and even lower standby power consumption are critical. Efficient on-chip charge pumps, coupled with manual and automatic powerdown functions, reduce the standby supply current to a 150nA trickle. The 5mmx5mm Quad Flat No-Lead (QFN) packaging and the use of small, low value capacitors ensure board space savings. Data rates greater than 250kbps are ensured at worst case load conditions. The ISL4221E is a 1 driver, 1 receiver device and the ISL3232E and ISL4223E are 2 driver, 2 receiver devices that, coupled with the 5mmx5mm QFN package, provide the industry's smallest, lowest power serial port suitable for PDAs, and hand-held applications. The 5mmx5mm QFN requires 40% less board area than a 20 Ld TSSOP, and is nearly 20% thinner. The ISL4221E and ISL4223E versions feature an automatic powerdown function that powers down the on-chip power supply and driver circuits. Automatic powerdown occurs when an attached peripheral device is shut off or the RS-232 cable is removed, and conserves system power automatically without changes to the hardware or operating system. The ISL4221E and ISL4223E power back up automatically when a valid RS-232 voltage is applied to any receiver input.

Features

  • Available in near chip scale QFN (5mmx5mm) package, which is 40% smaller than a 20 Ld 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 powerdown features (except ISL3232E)
  • Receiver hysteresis for improved noise immunity
  • Assured minimum data rate: 250kbps
  • Wide power supply range: single +2.7V to +5.5V
  • Low supply current in powerdown state: 150nA
  • Pb-free (RoHS compliant)

Applications

  • Any Space Constrained System Requiring RS-232 Ports Battery Powered, and Portable Equipment Hand-Held Products (GPS Receivers, Bar Code Scanners, etc) PDAs and Palmtops, Data Cables Cellular/Mobile Phones, Digital Cameras

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 60
Availability
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability

Documentation

Title language Type Format File Size Date
Datasheets & Errata
ISL3232E, ISL4221E, ISL4223E Datasheet Datasheet PDF 364 KB
Application Notes & White Papers
3.3V High-Speed Opto-Isolated RS-232 Interface with RV1S9160A and ISL3232E Application Note PDF 231 KB
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Application Note PDF 178 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
AN1976: Important Transient Immunity Tests for RS-485 Networks Application Note PDF 338 KB
AN1977: Transient Voltage Suppressors: Operation and Features Application Note PDF 365 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers Application Note PDF 369 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers Application Note PDF 500 KB
AN1980: Ground Potential Differences: Origin and Remedies Application Note PDF 375 KB
How to Simplify Industrial PC Interfaces 简体中文 White Paper PDF 920 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
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
PIN19028 - Q3 Cy 19 Price Increase Notice Price Increase Notice PDF 208 KB