ICL3238E

Features:

• Pb-Free Available as an Option (see Ordering Info)
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Active Feedback Resistors on T_^Xand 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 Hyst
eresis 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




Application

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




Pinout






Specifications

V_CCto Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 6V
V+ to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. -0.3V to 7V
V- to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..+0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
T_IN,FORCEOFF , FORCEON . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 6V
R_IN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .±25V
Output Voltages
T_OUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±13.2V
R_OUT, IN_VALID. . . . . . . . . . . . . . . . . . . . . . . .. . . . -0.3V to VCC+0.3V
Short Circuit Duration
T_OUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . .See Specification Table




Description

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.