DATASHEET ISL4241E, ISL4243E FN8037 Rev 7.00 QFN Packaged, 15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps, Jun 10, 2010 RS-232 Transmitters/Receivers Intersils ISL4241E, ISL4243E devices are 2.7V to 5.5V Features powered RS-232 transmitters/receivers which meet Pb-Free Available (RoHS compliant) ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Additionally, they provide 15kV ESD protection Parameters Fully Specified for 10% Tolerance Supplies (IEC61000-4-2 Air Gap and Human Body Model) on and Full Industrial Temp Range transmitter outputs and receiver inputs (RS-232 pins). Available in Small QFN (5mmx5mm) Package which is Targeted applications are PDAs, Palmtops, and notebook 60% Smaller than a 28 Lead TSSOP and laptop computers where the low operational, and even ESD Protection for RS-232 I/O Pins to 15kV (IEC61000) lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and automatic Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V power-down functions, reduce the standby supply current to RS-232 Compatible with V = 2.7V CC a 10nA trickle. Tiny 5mmx5mm Quad Flat No-Lead (QFN) packaging and the use of small, low value capacitors ensure On-Chip Voltage Converters Require Only Four External 0.1F Capacitors board space savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. Manual and Automatic Power-down Features The ISL4241E, ISL4243Es are 3 driver, 5 receiver devices Receiver Hysteresis For Improved Noise Immunity that, coupled with the 5x5 QFN package, provide the Guaranteed Minimum Data Rate . 250kbps industrys smallest, lowest power complete serial port suitable for PDAs, and laptop or notebook computers. The Wide Power Supply Range Single +2.7V to +5.5V 32 Ld 5X5 QFN requires 60% less board area than a 28 Ld Low Supply Current in Power-down State .10nA TSSOP, and is nearly 20% thinner. The devices also include a noninverting always-active receiver for wake-up Applications capability. Any Space Constrained System Requiring RS-232 Ports The ISL4243E features an automatic power-down function - Battery Powered, Hand-Held, and Portable Equipment that powers down the on-chip power-supply and driver - Laptop Computers, Notebooks circuits. This occurs when an attached peripheral device is - PDAs and Palmtops, Data Cables shut off or the RS-232 cable is removed, conserving system - Cellular/Mobile Phones, Digital Cameras, GPS power automatically without changes to the hardware or Receivers operating system. It powers up again when a valid RS-232 voltage is applied to any receiver input. Related Literature Table 1 summarizes the features of both the ISL4241E and Technical Brief TB363 Guidelines for Handling and ISL4243E, while Application Note AN9863 summarizes the Processing Moisture Sensitive Surface Mount Devices features of each device comprising the 3V RS-232 family. Technical Brief TB379 Thermal Characterization of Packages for ICs Technical Brief TB389 PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages TABLE 1. SUMMARY OF FEATURES AUTOMATIC NO. OF DATA MANUAL POWER- NO. OF NO. OF QFN PKG. MONITOR Rx. RATE Rx. ENABLE READY POWER- DOWN PART NUMBER Tx. Rx. AVAILABLE (R ) (kbps) FUNCTION OUTPUT DOWN FUNCTION OUTB ISL4241E 3 5 YES 2 250 YES NO YES NO ISL4243E 3 5 YES 1 250 NO NO YES YES FN8037 Rev 7.00 Page 1 of 14 Jun 10, 2010ISL4241E, ISL4243E Ordering Information PART TEMP. RANGE NUMBER PART MARKING (C) PACKAGE PKG. DWG. ISL4241EIR ISL 4241EIR -40 to +85 32 Ld QFN L32.5x5B ISL4241EIR-T* ISL 4241EIR -40 to +85 32 Ld QFN L32.5x5B Tape & Reel ISL4241EIRZ (Note) ISL4241 EIRZ -40 to +85 32 Ld QFN (Pb-Free) L32.5x5B ISL4241EIRZ-T* (Note) ISL4241 EIRZ -40 to +85 32 Ld QFN L32.5x5B Tape & Reel (Pb-Free) ISL4243EIR ISL 4243EIR -40 to +85 32 Ld QFN L32.5x5B ISL4243EIR-T* ISL 4243EIR -40 to +85 32 Ld QFN L32.5x5B Tape & Reel ISL4243EIRZ (Note) ISL4243 EIRZ -40 to +85 32 Ld QFN (Pb-Free) L32.5x5B ISL4243EIRZ-T* (Note) ISL4243 EIRZ -40 to +85 32 Ld QFN L32.5x5B 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. Pinouts ISL4241E ISL4243E (32 LD QFN) (32 LD QFN) TOP VIEW TOP VIEW 32 31 30 29 28 27 26 25 32 31 30 29 28 27 26 25 R1 1 24 GND R1 IN 1 24 GND IN C1- R2 C1- IN 2 23 R2 IN 2 23 FORCEON R3 EN 3 22 R3 IN IN 3 22 FORCEOFF SHDN R4 4 21 R4 IN 4 21 IN PD PD INVALID R5 R1 IN 5 20 R5 OUTB IN 5 20 R2 T1 R2 6 19 OUTB T1 OUT OUTB OUT 6 19 R1 T2 R1 7 18 OUT T2 OUT 7 18 OUT OUT T3 R2 8 17 T3 R2 OUT OUT OUT 8 17 OUT 9 10 11 12 13 14 15 16 9 10 11 12 13 14 15 16 FN8037 Rev 7.00 Page 2 of 14 Jun 10, 2010 NC NC T3 IN V- T2 IN C2- T1 IN C2+ R5 C1+ OUT R4 V+ OUT R3 V OUT CC NC NC NC NC T3 IN V- T2 IN C2- T1 C2+ IN C1+ R5 OUT R4 OUT V+ R3 V OUT CC NC NC