Datasheet ICL3225, ICL3245 1A, +3V to +5.5V, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown The ICL3225 and ICL3245 are 3.0V to 5.5V powered Features RS-232 transmitters/receivers that meet ElA/TIA-232 Pb-free (RoHS compliant) and V.28/V.24 specifications, even at V = 3.0V. CC 15kV ESD protected (Human Body Model) Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low Manual and enhanced automatic powerdown operational power consumption and even lower features standby power consumption is critical. Efficient Drop in replacements for MAX3225, MAX3245 on-chip charge pumps coupled with manual and enhanced automatic powerdown functions reduce the Meets EIA/TIA-232 and V.28/V.24 specifications standby supply current to a 1A trickle. Small footprint at 3V packaging and the use of small, low value capacitors Latch-up free ensure board space savings. Data rates greater than On-chip voltage converters require only 1Mbps are ensured at worst case load conditions. four external 0.1F capacitors The ICL3225 and ICL3245 are fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, Guaranteed mouse driveability (ICL3245) and 5.0V only systems. Ready to Transmit indicator output (ICL3225) The ICL3245 is a 3-driver, 5-receiver device that Receiver hysteresis for improved noise immunity provides a complete serial port suitable for laptop or Ensured minimum data rate: 1Mbps notebook computers. It also includes a noninverting always-active receiver for wake-up capability. Low skew at transmitter/receiver input trip points: 10ns The ICL3225 and ICL3245 feature an enhanced automatic powerdown function that powers down the Ensured minimum slew rate: 24V/s on-chip power-supply and driver circuits. Automatic Wide power supply range: Single +3V to +5.5V powerdown occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30s. Low supply current in powerdown state: 1A The ICL3225 and ICL3245 automatically power back Applications up whenever they sense a transition on any transmitter or receiver input. Any system requiring RS-232 communication ports Table 1 summarizes the features of the device Battery powered, hand-held, and portable represented by this datasheet. Application Note equipment AN9863 summarizes the features of each device in Laptop computers, notebooks, palmtops the ICL32xx 3V family. Modems, printers, and other peripherals Related Literature Digital cameras For a full list of related documents, visit our website: Cellular/mobile phones ICL3225, ICL3245 device pages Table 1. Summary of Features No. of No. of No. Of Monitor Data Rate Rx. Enable Ready Manual Enhanced Automatic Part Number Tx. Rx. Rx. (R ) (kbps) Function Output Powerdown Powerdown Function OUTB ICL3225 2 2 0 1000 No Yes Yes Yes ICL3245 3 5 1 1000 No No Yes Yes FN4878 Rev.10.00 Page 1 of 24 May.29.19ICL3225, ICL3245 Contents 1. Overview . 3 1.1 Typical Operating Circuits . 3 1.2 Ordering Information . 4 1.3 Pinouts 5 1.4 Pin Descriptions . 5 2. Specifications . 6 2.1 Absolute Maximum Ratings 6 2.2 Thermal Information 6 2.3 Recommended Operating Conditions 6 2.4 Electrical Specifications . 7 3. Typical Performance Curves . 9 4. Detailed Description 10 4.1 Charge Pump 10 4.1.1 Charge Pump Abs Max Ratings . 10 4.2 Transmitters . 11 4.3 Receivers . 12 4.4 Operation Down to 2.7V . 14 4.5 Powerdown Functionality . 14 4.5.1 Software Controlled (Manual) Powerdown . 14 4.5.2 INVALID Output 15 4.5.3 Enhanced Automatic Powerdown 15 4.5.4 Emulating Standard Automatic Powerdown . 16 4.5.5 Hybrid Automatic Powerdown Options 17 4.6 READY Output (ICL3225 Only) 17 4.7 Capacitor Selection . 17 4.8 Power Supply Decoupling 18 4.9 Transmitter Outputs when Exiting Powerdown 18 4.10 Mouse Driveability 18 4.11 High Data Rates . 19 4.12 Interconnection with 3V and 5V Logic . 19 5. Die Characteristics . 20 6. Revision History 21 7. Package Outline Drawings . 22 FN4878 Rev.10.00 Page 2 of 24 May.29.19