DATASHEET ISL4238E, ISL4244E, ISL4245E FN8038 Rev 5.00 QFN Packaged, 15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/ May 13, 2010 1Mbps, RS-232 Transceivers with Enhanced Automatic Power-down The Intersil ISL4238E, ISL4244E and ISL4245E devices are Features 2.7V to 5.5V powered RS-232 transmitters/receivers which Parameters Fully Specified for 10% Tolerance Supplies meet ElA/TIA-232 and V.28/V.24 specifications, even at and Full Industrial Temp Range V = 3.0V. Additionally, they provide 15kV ESD protection CC (IEC61000-4-2 Air Gap and Human Body Model) on Available in Small QFN (5mm x 5mm) Package which is 60% Smaller than a 28 Lead TSSOP transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are PDAs, Palmtops, and notebook ESD Protection for RS-232 I/O Pins to 15kV (IEC61000) and laptop computers where the low operational, and even DTE (ISL4244E/45E) and DCE (ISL4238E) Versions lower standby power consumption is critical. Efficient on-chip charge pumps, coupled with manual and enhanced Lowest Supply Current in Power-down .10nA automatic power-down functions, reduce the standby supply Active Feedback Resistors on T and Logic Inputs X current to a 10nA trickle. Tiny 5mmx5mm Quad Flat No-Lead (ISL4238E) (QFN) packaging and the use of small, low value capacitors Flow Through Pinouts ensure board space savings as well. Data rates greater than 250kbps (ISL4238E/ISL4244E)/1Mbps (ISL4245E) are Manual and Enhanced Automatic Power-down Features guaranteed at worst case load conditions. Guaranteed Minimum Data Rate The ISL424xE are 3 driver, 5 receiver (DTE) devices that, 250kbps (ISL4238E/ISL4244E) / 1Mbps (ISL4245E) coupled with the QFN package, provide the industrys Latch-Up Free smallest, lowest power complete serial port suitable for On-Chip Charge Pumps Require Only Four External PDAs, and laptop or notebook computers. The 32 Ld 5x5 0.1F Capacitors QFN requires 60% less board area than a 28 lead TSSOP, and is nearly 20% thinner. The devices also include a Wide Power Supply Range Single +2.7V to +5.5V noninverting always-active receiver for wake-up capability. Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V The ISL4238E is a 5 driver, 3 receiver device optimized for RS-232 Compatible with V = 2.7V CC DCE applications with full hardware handshaking. It also Pb-Free Available (RoHS Compliant) includes a noninverting always-active receiver for RING INDICATOR monitoring. Transmitter and logic inputs include Applications active feedback resistors that retain the input state once driven to a valid logic level. Any Space Constrained System Requiring RS-232 Ports - Battery Powered, Hand-Held, and Portable Equipment These devices feature an enhanced automatic power-down - Laptop Computers, Notebooks function which powers down the on-chip power-supply and driver circuits. This occurs when all receiver and transmitter - PDAs and Palmtops, Data Cables inputs detect no signal transitions for a period of 30s. These - Cellular/Mobile Phones, Digital Cameras, GPS devices power back-up, automatically, whenever they sense Receivers a transition on any transmitter or receiver input. Related Literature Table 1 summarizes the features of the ISL4238E, Technical Brief TB363 Guidelines for Handling and ISL4244E, ISL4245, while Application Note AN9863 Processing Moisture Sensitive Surface Mount Devices summarizes the features of each device comprising the 3V Technical Brief TB379 Thermal Characterization of RS-232 family. Packages for ICs Technical Brief TB389 PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages FN8038 Rev 5.00 Page 1 of 17 May 13, 2010ISL4238E, ISL4244E, ISL4245E TABLE 1. SUMMARY OF FEATURES ENHANCED AUTOMATIC NO. OF DATA MANUAL POWER- NO. OF NO. OF MONITOR Rx. RATE Rx. ENABLE POWER- DOWN PART NUMBER Tx. Rx. CONFIG. QFN PKG. (R ) (kbps) FUNCTION DOWN FUNCTION OUTB ISL4238E 5 3 DCE 5x5 1 250 No Yes Yes ISL4244E 3 5 DTE 5x5 1 250 No Yes Yes ISL4245E 3 5 DTE 5x5 1 1000 No Yes Yes Ordering Information TEMP. PKG. PART NUMBER PART MARKING RANGE (C) PACKAGE DWG. ISL4238EIR ISL 4238EIR -40 to +85 32 Ld 5X5 QFN L32.5x5B ISL4238EIRZ ISL4238 EIRZ -40 to +85 32 Ld 5X5 QFN L32.5x5B (Note) (Pb-Free) ISL4238EIR-T* ISL 4238EIR -40 to +85 32 Ld 5X5 QFN L32.5x5B Tape & Reel ISL4238EIRZ-T* ISL4238 EIRZ -40 to +85 32 Ld 5X5 QFN L32.5x5B (Note) Tape & Reel, (Pb-Free) ISL4244EIR ISL 4244EIR -40 to +85 32 Ld 5X5 QFN L32.5x5B ISL4244EIRZ ISL4244 EIRZ -40 to +85 32 Ld 5X5 QFN L32.5x5B (Note) (Pb-free) ISL4244EIR-T* ISL 4244EIR -40 to +85 32 Ld 5X5 QFN L32.5x5B Tape & Reel ISL4244EIRZ-T* ISL4244 EIRZ -40 to +85 32 Ld 5X5 QFN L32.5x5B (Note) Tape & Reel, (Pb-Free) ISL4245EIR ISL 4245EIR -40 to +85 32 Ld 5X5 QFN L32.5x5B ISL4245EIRZ ISL4245 EIRZ -40 to +85 32 Ld 5X5 QFN L32.5x5B (Note) (Pb-Free) ISL4245EIR-T* ISL 4245EIR -40 to +85 32 Ld 5X5 QFN L32.5x5B Tape & Reel ISL4245EIRZ-T* ISL4245 EIRZ -40 to +85 32 Ld 5X5 QFN L32.5x5B (Note) Tape & Reel, (Pb-Free) *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. FN8038 Rev 5.00 Page 2 of 17 May 13, 2010