ISL4244EIR-T Intersil, ISL4244EIR-T Datasheet

ISL4244EIR-T

Manufacturer Part Number

ISL4244EIR-T

Description

IC 3DRVR/5RCVR RS232 3V 32-QFN

Manufacturer

Intersil

Type

Transceiverr

Datasheet

1.ISL4244EIRZ.pdf (17 pages)

Specifications of ISL4244EIR-T

Number Of Drivers/receivers

3/5

Protocol

RS232

Voltage - Supply

2.7 V ~ 5.5 V

Mounting Type

Surface Mount

Package / Case

32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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QFN Packaged, ±15kV ESD Protected,

+2.7V to +5.5V, 10Nanoamp, 250kbps/

1Mbps, RS-232 Transceivers with

Enhanced Automatic Power-down

The Intersil ISL4238E, ISL4244E and ISL4245E 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

(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 enhanced

automatic power-down functions, reduce the standby supply

current to a

(QFN) packaging and the use of small, low value capacitors

ensure board space savings as well. Data rates greater than

250kbps (ISL4238E/ISL4244E)/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 32 Ld 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 power-down

function which powers down the on-chip power-supply and

driver circuits. This occurs when all receiver and transmitter

inputs detect no signal transitions for a period of 30s. 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,

ISL4244E, ISL4245, while Application Note AN9863

summarizes the features of each device comprising the 3V

RS-232 family.

= 3.0V. Additionally, they provide ±15kV ESD protection

10nA

trickle. Tiny 5mmx5mm Quad Flat No-Lead

Data Sheet

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Features

• Parameters Fully Specified for 10% Tolerance Supplies

• Available in Small QFN (5mm x 5mm) Package which is

• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)

• DTE (ISL4244E/45E) and DCE (ISL4238E) Versions

• Lowest Supply Current in Power-down . . . . . . . . . . .10nA

• Active Feedback Resistors on T

• Flow Through Pinouts

• Manual and Enhanced Automatic Power-down Features

• Guaranteed Minimum Data Rate

• Latch-Up Free

• On-Chip Charge Pumps Require Only Four External

• 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 V

• Pb-Free Available (RoHS Compliant)

Applications

• Any Space Constrained System Requiring RS-232 Ports

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

• Technical Brief TB379 “Thermal Characterization of

• Technical Brief TB389 “PCB Land Pattern Design and

ISL4238E, ISL4244E, ISL4245E

and Full Industrial Temp Range

60% Smaller than a 28 Lead TSSOP

(ISL4238E)

0.1µF Capacitors

- Battery Powered, Hand-Held, and Portable Equipment

- Laptop Computers, Notebooks

- PDAs and Palmtops, Data Cables

- Cellular/Mobile Phones, Digital Cameras, GPS

Processing Moisture Sensitive Surface Mount Devices”

Packages for ICs”

Surface Mount Guidelines for QFN Packages”

Receivers

250kbps (ISL4238E/ISL4244E) / 1Mbps (ISL4245E)

All other trademarks mentioned are the property of their respective owners.

May 13, 2010

Intersil (and design) is a registered trademark of Intersil Americas Inc.

= 2.7V

and Logic Inputs

FN8038.5

Related parts for ISL4244EIR-T

ISL4244EIR-T Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | 1-888-INTERSIL or 1-888-468-3774 Intersil (and design registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004, 2008, 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. FN8038.5 and Logic Inputs ...

Page 2

... ISL 4238EIR ISL4238EIRZ ISL4238 EIRZ (Note) ISL4238EIR-T* ISL 4238EIR ISL4238EIRZ-T* ISL4238 EIRZ (Note) ISL4244EIR ISL 4244EIR ISL4244EIRZ ISL4244 EIRZ (Note) ISL4244EIR-T* ISL 4244EIR ISL4244EIRZ-T* ISL4244 EIRZ (Note) ISL4245EIR ISL 4245EIR ISL4245EIRZ ISL4245 EIRZ (Note) ISL4245EIR-T* ISL 4245EIR ISL4245EIRZ-T* ISL4245 EIRZ (Note) *Please refer to TB347 for details on reel specifications ...

Page 3

Pinouts ISL4238E (32 LD QFN) TOP VIEW OUT 1 T2 OUT OUT OUT OUT ...

Page 4

Typical Operating Circuits (NOTE) TTL/CMOS LEVELS NOTE: For V = 3.15V (3.3V -5%), use ISL4238E, ISL4244E, ISL4245E ISL4238E +3.3V + 0.1µ C1 0.1µ C2+ ...

Page 5

Typical Operating Circuits TTL/CMOS LOGIC LEVELS CONTROL LOGIC 5 ISL4238E, ISL4244E, ISL4245E (Continued) ISL4244E, ISL4245E +3.3V + 0.1µ C1 0.1µ C2+ + 0.1µ C2- T ...

Page 6

... Thermal Resistance (Typical, Notes QFN Package Moisture Sensitivity (see Technical Brief TB363) QFN Package Level 1 Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp Operating Conditions +0.3V CC Temperature Range ISL42xxEIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C = 3.15V to 5.5V ...

Page 7

Electrical Specifications Test Conditions: ISL4238E V ISL424xE V PARAMETER ENHANCED AUTOMATIC POWER-DOWN (FORCEON = GND, FORCEOFF = V Receiver Input Thresholds to (see Figure 6) INVALID High Receiver Input Thresholds to (see Figure 6) INVALID Low INVALID, Output Voltage Low ...

Page 8

... The charge pump, the transmitters, and the receivers. Charge-Pump Intersil’s new RS-232 family utilizes regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate ±5.5V transmitter supplies from a V low as 3.0V. This allows these devices to maintain RS-232 compliant output levels over the ± ...

Page 9

RCVR OR XMTR EDGE WITHIN 30 FORCEOFF FORCEON SEC? INPUT INPUT YES H L YES INVALID DRIVING FORCEON AND FORCEOFF ...

Page 10

V CC TRANSITION DETECTOR TO WAKE-UP LOGIC OUTB HI-Z X OUT R POWERED OUT DOWN UART FORCEOFF = GND FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN Power-down Functionality The already ...

Page 11

GND by the internal receiver pull down resistors), the INVALID logic detects the invalid levels and drives the output low. The power management logic then uses this indicator to power down the interface block. Reconnecting the ...

Page 12

RECEIVER INPUTS TRANSMITTER INPUTS TRANSMITTER OUTPUTS t INVH INVALID t INVL OUTPUT OUTPUT FIGURE 9. ENHANCED AUTOMATIC POWER-DOWN AND INVALID TIMING DIAGRAMS Hybrid Automatic Power-down Options For devices which communicate only through a detachable cable, ...

Page 13

FORCEOFF 2V/DIV V = +3. 0.1µF TIME (20µs/DIV) FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING POWER-DOWN Mouse Driveability The ISL424XE are specifically designed to power a serial mouse while operating from low voltage supplies. Figure ...

Page 14

OUT R1 OUT V = +3. 0.1µF 2µs/DIV. FIGURE 15. ISL4245E LOOPBACK TEST AT 250kbps 5V/DIV OUT R1 OUT V = +3. 0.1µF ...

Page 15

Typical Performance Curves TRANSMITTER AT 250kbps OTHER TRANSMITTERS AT 30kbps 1000 2000 3000 LOAD CAPACITANCE (pF) FIGURE 17. ISL4238E TRANSMITTER OUTPUT VOLTAGE vs LOAD CAPACITANCE TRANSMITTER AT ...

Page 16

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

Page 17

Package Outline Drawing L32.5x5B 32 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 2, 11/07 5.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( 4. 80 TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 17 ISL4238E, ISL4244E, ...

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