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Part: ISL4245EIR
Category:
Analog & Mixed-Signal Processing
Description: QFN Packaged, 15kV Esd Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/ 1Mbps, RS-232 Transceivers With Enhanced Automatic Powerdown
Company: Intersil Corporation
Datasheet: Download ISL4245EIR datasheet File size : 1127 kB
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Datasheet text preview:
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ISL4238E, ISL4244E, ISL4245E
Da ta Sheet N ov e m be r 2002 FN 8 0 38 . 2
QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/ 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown
The Intersil ISL4238E/44E/45E 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 (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 to a 10nA trickle. Tiny 5mm 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 250kbps (ISL4238E/44E) / 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 ISL4238E is 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 (5mm x 5mm) Package which is 60% Smaller than a 28 Lead TSSOP · ESD Protection for RS-232 I/O Pins to ±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 250kbps (ISL4238E/44E) / 1Mbps (ISL4245E) · Latch-Up Free · On-Chip Charge Pumps Require Only Four External 0.1µF Capacitors · Wide Power Supply Range . . . . . . Single +2.7V to +5.5V · Meets EIA/TIA-232 and V.28/V.24 Specifications at 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
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"
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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. 2002. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL4238E, ISL4244E, ISL4245E
TABLE 1. SUMMARY OF FEATURES NO. OF MONITOR Rx. (ROUTB) 1 1 1 DATA RATE (kbps) 250 250 1000 MAN UAL POWERDOWN? YES YES YES E NHANCE D AUTOMATIC POWERDOWN FUNCTION? Y ES Y ES Y ES
P ART NUMBER ISL4238E ISL4244E ISL4245E
NO. OF NO. OF Tx. Rx. 5 3 3 3 5 5
CONFIG. DCE DTE DTE
QFN PKG. 5x5 5 x5 5 x5
Rx. ENABLE FUNCTION? NO NO NO
Ordering Information
PART NO. (BRAND) ISL4238EIR ( 4238EI R ) ISL4238EIR-T ( 4238EI R ) ISL4244EIR ( 4244EI R ) TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 P ACKAGE 32 Ld QFN Tape & Reel 32 Ld QFN PKG. NO. L32.5x5 L32.5x5 L32.5x5
Ordering Information (Continued)
PART NO. (BRAND) ISL4244EIR-T (4244EI R ) ISL4245EIR (4245EI R ) ISL4245EIR-T (4245EI R ) TEMP. RANGE (oC) -40 to 85 -40 to 85 -40 to 85 P ACKAGE Tape & Reel 32 Ld QFN Tape & Reel PKG. NO. L32.5x5 L32.5x5 L32.5x5
Pinouts
ISL4238E (QFN) TOP VIEW
GND VC C C2+ C1+ C2NC V+ V-
ISL4244E, ISL4245E (QFN) TOP VIEW
VCC 26 C2+ C1+ C2-
NC
32 T1OUT T2OUT T3OUT R1IN R2IN T4OUT R3IN T5OUT 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 C1T1IN T2IN T3IN R1OUT R2OUT T4IN R3OUT R1IN R2IN R3IN R4IN R5IN T1OUT T2OUT T3OUT 1 2 3 4 5 6 7 8
32
31
30
29
28
V+
V-
27
NC 25 24 23 22 21 20 19 18 17 GND C1FORCEON FORCEOFF INVALID R2OUTB R1OUT R2OUT 16 NC
10 FORCEON
11 FORCEOFF
12 INVALID
13 NC
14 R1OUTB
15 T5IN
16 NC
9 NC
10 T3IN
11 T2IN
12 T1IN
13 R5OUT
14 R4OUT
15 R3OUT
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ISL4238E, ISL4244E, ISL4245E Pin Descriptions
PIN VCC V+ VG ND C1+ C1C2+ C2TIN TOUT R IN 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. (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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