Details, datasheet, quote on part number: ISL4244EIR-T
PartISL4244EIR-T
CategoryAnalog & Mixed-Signal Processing
DescriptionQFN Packaged, 15kV Esd Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/ 1Mbps, RS-232 Transceivers With Enhanced Automatic Powerdown
CompanyIntersil Corporation
DatasheetDownload ISL4244EIR-T datasheet
Cross ref.Similar parts: MAX3243E
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Features, Applications

QFN Packaged, 15kV ESD Protected, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown

The Intersil ISL4238E/44E/45E devices are 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, they provide 15kV ESD protection (IEC6100-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient onchip charge pumps, coupled with manual and enhanced automatic powerdown functions, reduce the standby supply current a 10nA trickle. Tiny x 5mm Quad Flat NoLead (QFN) packaging and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 1Mbps (ISL4245E) are guaranteed at worst case load conditions. The ISL424XE are 3 driver, 5 receiver (DTE) devices that, coupled with the QFN package, provide the industry's smallest, lowest power complete serial port suitable for PDAs, and laptop or notebook computers. The 5x5 QFN requires 60% less board area than a 28 lead TSSOP, and is nearly 20% thinner. The devices also include a noninverting always-active receiver for "wake-up" capability. The 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. Transmitter and logic inputs include active feedback resistors that retain the input state once driven to a valid logic level. 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. Table 1 summarizes the features of the ISL4238E/4XE, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.

Features

Parameters Fully Specified for 10% Tolerance Supplies and Full Industrial Temp Range Available in Small QFN x 5mm) Package which is 60% Smaller than a 28 Lead TSSOP ESD Protection for RS-232 I/O Pins 15kV (IEC6100) DTE (ISL4244E/45E) and DCE (ISL4238E) Versions Lowest Supply Current in Powerdown.10nA Active Feedback Resistors on TX and Logic Inputs (ISL4238E) Flow Through Pinouts Manual and Enhanced Automatic Powerdown Features Guaranteed Minimum Data Rate 1Mbps (ISL4245E) Latch-Up Free On-Chip Charge Pumps Require Only Four External 0.1F Capacitors Wide Power Supply Range. Single to +5.5V Meets EIA/TIA-232 and V.28/V.24 Specifications 3V RS-232 Compatible with VCC = 2.7V

Applications

Any Space Constrained System Requiring RS-232 Ports - Battery Powered, Hand-Held, and Portable Equipment - Laptop Computers, Notebooks - PDAs and Palmtops, Data Cables - Cellular/Mobile Phones, Digital Cameras, GPS Receivers

Technical Brief TB363 "Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices" Technical Brief TB379 "Thermal Characterization of Packages for ICs" Technical Brief TB389 "PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages"

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2002. All Rights Reserved All other trademarks mentioned are the property of their respective owners.

TABLE 1. SUMMARY OF FEATURES NO. OF MONITOR Rx. (ROUTB) 1 DATA RATE (kbps) 250 1000 MANUAL POWERDOWN? YES ENHANCED AUTOMATIC POWERDOWN FUNCTION? YES

PART NO. (BRAND) ISL4244EIR (4244EIR) TEMP. RANGE (oC) to 85 PACKAGE 32 Ld QFN Tape & Reel 32 Ld QFN PKG. NO. L32.5x5

PART NO. (BRAND) ISL4245EIR-T (4245EIR) TEMP. RANGE (oC) to 85 PACKAGE Tape & Reel 32 Ld QFN Tape & Reel PKG. NO. L32.5x5


PIN VCC V+ VGND C1C2+ C2TIN TOUT RIN ROUT ROUTB INVALID System power supply input to 5.5V). Internally generated positive transmitter supply (+5.5V). Internally generated negative transmitter supply (-5.5V). Ground connection. External capacitor (voltage doubler) is connected to this lead. External capacitor (voltage doubler) is connected to this lead. External capacitor (voltage inverter) is connected to this lead. External capacitor (voltage inverter) is connected to this lead. TTL/CMOS compatible transmitter Inputs. (Note 1) 15kV ESD Protected, RS-232 level (nominally 5.5V) transmitter outputs. 15kV ESD Protected, RS-232 compatible receiver inputs. TTL/CMOS level receiver outputs. TTL/CMOS level, noninverting, always enabled receiver outputs. Active low output that indicates if no valid RS-232 levels are present on any receiver input. FUNCTION

FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2). FORCEON NOTE: 1. ISL4238E input pins incorporate positive feedback resistors. Once the input is driven to a valid logic level, the feedback resistor maintains that logic level until VCC is removed. Unused transmitter inputs may be left unconnected by the user. Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).


 

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