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Part: ISL4243EIR-T
Category:
Analog & Mixed-Signal Processing
Description: QFN Packaged, +/-15kV Esd Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps, RS-232 Transmitters/receivers
Company: Intersil Corporation
Datasheet: Download ISL4243EIR-T datasheet File size : 1127 kB
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Datasheet text preview:
®
ISL4241E, ISL4243E
D a ta Sheet A p r i l 2003 FN8037.3
QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps, RS-232 Transmitters/Receivers
The Intersil ISL424XE devices are 2.7V 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 (IEC61000-4-2 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 on-chip charge pumps, coupled with manual and automatic powerdown functions, reduce the standby supply current to a 10nA trickle. Tiny 5mm x 5mm Quad Flat No-Lead (QFN) 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. The ISL424XE are 3 driver, 5 receiver devices that, coupled with the 5x5 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 alwaysactive receiver for "wake-up" capability. The ISL4243E features an automatic powerdown function that powers down the on-chip power-supply and driver circuits. This occurs when an attached peripheral device is shut off or the RS-232 cable is removed, conserving system power automatically without changes to the hardware or operating system. It powers up again when a valid RS-232 voltage is applied to any receiver input. Table 1 summarizes the features of the ISL424XE, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.
NO. OF MONITOR Rx. NO. OF NO. OF QFN PKG. (ROUTB) Tx. Rx. AVAILABLE? 3 3 5 5 YES YES 2 1
Features
· Parameters Fully Specified for 10% Tolerance Supplies and Full Industrial Temp Range · Available in Small QFN (5mm x 5mm) Package which is 60% Smaller than a 28 Lead TSSOP · ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000) · Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V · RS-232 Compatible with VCC = 2.7V · On-Chip Voltage Converters Require Only Four External 0.1µF Capacitors · Manual and Automatic Powerdown Features · Receiver Hysteresis For Improved Noise Immunity · Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps · Wide Power Supply Range . . . . . . Single +2.7V to +5.5V · Low Supply Current in Powerdown State. . . . . . . . . .10nA
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
Related Literature
· 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"
TABLE 1. SUMMARY OF FEATURES PART NUMBER ISL4241E ISL4243E DATA RATE (kbps) 250 250 Rx. ENABLE FUNCTION? YES NO READY OUTPUT? NO NO MANUAL POWERDOWN? YES YES AUTOMATIC POWERDOWN FUNCTION? NO YES
Ordering Information
PART NO. ISL4241EIR ISL4241EIR-T ISL4243EIR ISL4243EIR-T TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 32 Ld QFN Tape & Reel 32 Ld QFN Tape & Reel PKG. NO. L32 .5x5 L32.5x5 L32 .5x5 L32.5x5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
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ISL4241E, ISL4243E Pinouts
ISL4241E (QFN) TOP VIEW
VCC C2+ C1+ C2NC C2NC NC V+ VV-
ISL4243E (QFN) TOP VIEW
VCC 26 C2+ C1+ V+ NC 25 24 23 22 21 20 19 18 17 9 NC 10 T3IN 11 T2IN 12 T1IN 13 R5OUT 14 R4OUT 15 R3OUT 16 NC GND C1FORCEON FORCEOF F INVALID R2OUTB R1OUT R2OUT
32 R1IN R2IN R3IN R4IN R5IN T1OUT T2OUT T3OUT 1 2 3 4 5 6 7 8 9 NC
31
30
29
28
27
26
25 24 23 22 21 20 19 18 17 GND C1EN SHDN R1OUTB R2OUTB R1OUT R2OUT R1IN R2IN R3IN R4IN R5IN T1OUT T2OUT T3OUT 1 2 3 4 5 6 7 8
32
31
30
29
28
27
10 T3IN
11 T2IN
12 T1IN
13 R5OUT
14 R4OUT
15 R3OUT
16 NC
Pin Descriptions
PIN VCC V+ VGND C1+ C 1C2+ C 2TIN TOUT RIN ROUT ROUTB INVALID System power supply input (2.7V 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. ±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 EN SHDN NC Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high). Active low receiver enable control. Active low input to shut down transmitters and on-board power supply, to place device in low power mode. No Connection
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ISL4241E, ISL4243E Typical Operating Circuits
ISL4241E
+3.3V + +3.3V 0.1µF 26 VCC V+ 27 + C3 0.1µF C4 0.1µF + T1OUT 7 8 T2OUT T3OUT RS-232 LEVELS C1 0.1µF C2 0.1µF + +
ISL4243E
0.1µF 28 23 C1+
26 V CC 27 V+ 31 + C3 0.1µF
C1 0.1µF C2 0.1µF T1IN T2IN T3IN R1OUTB R2OUTB T TL/CMO S LOGIC LEVELS R1OUT
28 C1+ + 23 C129 C2+ + 30 C212 11 10 20 19
VT1 T2 T3
31 6
C129 C2+ + 30 C212 T1
V-
C4 0.1µF +
T1IN
6 T1 O U T 7 T2 O U T 8 T3 O U T RS-232 LEVELS
T2IN T3IN
11 10
T2
T3
19 R2OUTB 1 R1 5k 2 R2 5k 3 R3 5k 4 R4 5k 5 EN R5 5k R5IN R5 OUT 13 22 SHDN GND 24 VCC TO POWER CONTROL LOGIC 21 20 R5 FORCEON 5k R4IN R3IN RS-232 LEVELS 15 R3 OUT R3 R4 OUT 14 R4 5k 5 R5IN 5k 4 R4IN R2IN R1IN TTL/ CMOS LOGIC LEVELS R2 OUT 18 R1 OUT R1 17 R2 5k 3 R3IN RS-232 LEVELS 5k 2 R2IN 1 R1IN
18
R2OUT
17
15 R3OUT 14 R4OUT 13 22 21
R5OUT
VCC
FORCEOFF INV A LI D GND 24
3
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