The ICL3237E contains 3. 0V to 5. 5V powered RS-232 transmitters/receivers that meet ElA/TIA-232 and V. 28/V. 24 specifications, even at VCC = 3. 0V. It provides ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are cell phones, PDAs, Palmtops, and notebook and laptop computers where the low operational power and even lower standby power consumption is critical. Efficient on-chip charge pumps coupled with the manual powerdown function reduce the standby supply current to a 10nA trickle. Small footprint packaging and the use of small, low value capacitors ensure board space savings. Data rates greater than 1Mbps (MBAUD = VCC) are ensured at worst case load conditions. The ICL3237E is fully compatible with 3. 3V only systems, mixed 3. 3V and 5. 0V systems, and 5. 0V only systems. The ICL3237E is a 5 driver, 3 receiver device that also includes a noninverting always-active receiver for “wake-up” capability. Table 1 summarizes the features of the ICL3237E. Application Note AN9863 summarizes the features of each device comprising the ICL32xx RS-232 3V family.


  • Pb-free (RoHS compliant)
  • ESD protection for RS-232 I/O pins to ±15kV (IEC61000)
  • Pin compatible replacement for MAX3237E
  • Pin selectable, ensured data rate: 250kbps/1Mbps
  • Meets EIA/TIA-232 and V.28/V.24 specifications at 3V
  • RS-232 compatible with VCC = 2.7V
  • Latch-up free
  • On-chip voltage converters require only four external capacitors
  • Manual powerdown feature
  • Flow through pinout
  • Rx and Tx hysteresis for improved noise immunity
  • Rx active in powerdown; separate Rx Enable pin
  • Guaranteed minimum slew rate: 6V/µs or 24V/µs
  • Wide power supply range: Single +3V to +5.5V
  • Low supply current in powerdown state: 10nA


  • Any System Requiring RS-232 Communication Ports Battery Powered, Hand-Held, and Portable Equipment Laptop Computers, Notebooks, Palmtops Modems, Printers and other Peripherals Data Cradles and Cables Cellular/Mobile Phone

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active SSOP Tube 705
Active SSOP Reel 1000
Active SSOP Tube 705
Active SSOP Reel 1000

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ICL3237E Here Datasheet Datasheet PDF 313 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
PCN11116 - Alternate Manufacturing Site for Assembly of the Listed Intersil 28l SSOP Products - ANST (Wuxi CR Micro-Assembly Technology Ltd.) Product Change Notice PDF 180 KB
ICL3237E IBIS Model Model IBS 65 KB
icl3237-design-model Model IBS 65 KB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB