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Part: ISL4223E
Category:
Analog & Mixed-Signal Processing
Description: QFN Packaged, +/-15kV Esd Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/receivers
Company: Intersil Corporation
Datasheet: Download ISL4223E datasheet File size : 1127 kB
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Datasheet text preview:
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ISL4221E, ISL4223E
D a ta Sheet A p r i l 2003 FN6045
QFN Packaged, +/-15kV ESD Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/Receivers
The Intersil ISL422XE 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 hand-held products 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 150nA 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 ISL4221E is a 1 driver, 1 receiver device and the ISL4223E is a 2 driver, 2 receiver device that, coupled with the 5x5 QFN package, provide the industry's smallest, lowest power serial port suitable for PDAs, and hand-held applications. The 5x5 QFN requires 40% less board area than a 20 lead TSSOP, and is nearly 20% thinner. The ISL422XE 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 ISL422XE, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.
PART NUMBER ISL4221E ISL4223E NO. OF NO. OF Tx. Rx. 1 2 1 2 QFN PKG. AVAILABLE? YES YES
Features
· Available in Near Chip Scale QFN (5mmx5mm) Package which is 40% Smaller than a 20 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. . . . . . . . .150nA
Applications
· Any Space Constrained System Requiring RS-232 Ports - Battery Powered, and Portable Equipment - Hand-Held Products (GPS Receivers, Bar Code Scanners, etc.) - PDAs and Palmtops, Data Cables - Cellular/Mobile Phones, Digital Cameras
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 DATA RATE (kBps) 250 250 Rx. ENABLE FUNCTION? YES YES MANUAL POWERDOWN? YES YES AUTOMATIC POWERDOWN FUNCTION? YES YES
Ordering Information
PART NO. ISL4221EIR ISL4221EIR-T ISL4223EIR ISL4223EIR-T TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 -40 to 85 PACKAGE 16 Ld QFN 16 Ld QFN Tape & Reel 20 Ld QFN 20 Ld QFN Tape & Reel PKG. NO. L16.5x5 L16.5x5 L20.5x5 L20.5x5
1
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
ISL4221E, ISL4223E Pinouts
ISL4221E (QFN) TOP VIEW ISL4223E (QFN) TOP VIEW
FORCEOF F
FORCEOFF
VCC
C1+
EN
16 V+ C1C2+ C21 2 3 4 5 V-
15
14
13 12 GND 11 T1OUT 10 FORCEON 9 T1IN V+ C1C2+ C2V1 2 3 4 5
20
19
18
17
GND 16 15 T1OUT 14 R1IN 13 R1OUT 12 FORCEON 11 T1IN 10 T2IN
6 R1IN
7 R1OUT
8 INV A LI D
6 T2OUT
7 R2IN
8 R2OUT
Pin Descriptions
PIN VCC V+ VGND C1+ C 1C2+ C 2TIN TOUT RIN ROUT 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. 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 Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high). Active low receiver enable control.
2
INVALID
VCC 9
C1+
EN
ISL4221E, ISL4223E Typical Operating Circuits
ISL4221E
+3.3V
+
0.1µF
13 VCC V+ 1 + C3 0.1µF C4
C1 0.1µF C2 0.1µF
16 + C1+ 2 C13 + C2+ 4 C29
V- 5 T1 11
+ 0.1µF T1OUT R1IN RS-232 LEVELS
TT L/CMO S LOGIC LEVELS R1OUT
T1IN
7 R1 15 EN FORCEOFF 10 FORCEON GND 12 INV A LI D 5k
6
14 8
V CC TO POWER CONTROL LOGIC
ISL4223E
+3.3V
+
0.1µF 20 + 2 3 + 4 11 10 C1+ C1C2+ C2-
17 VCC V+ 1 + C3 0.1µF C4 0.1µF + T1OUT T2OUT RS-232 LEVELS
C1 0.1µF C2 0.1µF
VT1 T2
5 15 6
T1IN T2IN TT L/CMO S LOGIC LEVELS
R1OUT
13 R1 5k
14
R1IN
R2OUT
8 19 EN R2 5k
7
R2IN
FORCEOF F 12 FORCEON GND 16 INV A LI D
18 9
VCC TO POWER CONTROL LOGIC
3
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