±15kV ESD Protected, 5-Tx, 3-Rx, 250kbps, RS-232 Transceiver with Enhanced Automatic Powerdown


The Intersil ICL3238E contains 3.0V 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, 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, Palmtops, and data cables where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and enhanced automatic powerdown functions, reduce the standby supply current to a 10nA trickle. Small footprint 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 providing compatibility with popular PC communication software.

The ICL3238E is a 5 driver, 3 receiver device optimized for DCE applications with full hardware handshaking. It also includes a noninverting always-active receiver for RING INDICATOR monitoring.

This device, features an enhanced automatic powerdown function which powers down the on-chip power-supply and driver circuits. This occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30s. The ICL3238E powers back up, automatically, whenever it senses a transition on any transmitter or receiver input.

The transmitter and logic inputs include active feedback resistors that retain the input state once driven to a valid logic level.


  • Pb-Free Available as an Option (see Ordering Info)
  • ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
  • Active Feedback Resistors on TX and Logic Inputs.
  • Manual and Enhanced Automatic Powerdown Features
  • Pin Compatible Replacement for MAX3238E, MAX3238, SP3238E
  • Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
  • RS-232 Compatible Outputs at 2.7V Supply
  • Flow Through Pinout
  • Latch-Up Free
  • On-Chip Voltage Converters Require Only Four External Capacitors
  • Receiver and Transmitter Hysteresis For Improved Noise Immunity
  • Guaranteed Minimum Data Rate 250kbps
  • Guaranteed Minimum Slew Rate 6V/µs
  • Wide Power Supply Range Single +3V to +5.5V
  • Low Supply Current in Powerdown State 10nA


 Block Diagram


Basic Information
Production Status
Mass Production(*)
# of Rx
# of Tx
High ESD Protection
Data Rate
0.5 Mbps
Supply Voltage Vcc (Min) (V)
Supply Voltage Vcc (Max) (V)
Manual Shutdown
Auto Shutdown
Rx Disable
Capacitance Value
0.1 µF
IS Enabled (mA)
IS Disabled
0.01 µA
Qualification Level
Supply Voltage Vcc Range (V)
3 to 5.5
Can Sample
Temperature Range
-40 to +85

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