ICL3244

Features:

• Pb-free Available as an Option (see Ordering Information)
• ±15kV ESD Protected (Human Body Model)
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3224, MAX3226, MAX3238, MAX3244
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• RS-232 Compatible with V_CC = 2.7V
• On-Chip Voltage Converters Require Only Four External 0.1F Capacitors
• Flow-Through Pinout (ICL3238)
• Guaranteed Mouse Driveability (ICL3244)
• "Ready to Transmit" Indicator Output (ICL3224/26)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/s
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . . .1A




Application

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




Pinout

Specifications

V_CC to 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, INVALID, READY . . . . . . . . . . . . . . ............... . -0.3V to V_CC +0.3V
Short Circuit Duration
T_OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......... . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . ................. . . See Specification Table




Description

The Intersil ICL3244 devices are 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. 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 enhanced automatic powerdown functions, reduce the standby supply current to a 1A 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. This family is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems. The ICL3244 is a 3 driver, 5 receiver device that provides a complete serial port suitable for laptop or notebook computers. The ICL3244/38 also include a noninverting always-active receiver for RING INDICATOR monitoring. These devices feature an enhanced automatic powerdown function which powers down the on-chip powersupply and driver circuits. This occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30sec. These devices power back up, automatically, whenever they sense a transition on any transmitter or receiver input.