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ISL4244E
DATA SHEET
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intersil ISL4244E DATA SHEET

®
www.BDTIC.com/Intersil
ISL4238E, ISL4244E, ISL4245E
Data Sheet April 2004
QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/ 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown
= 3.0V. Additionally, they pro vide ±15kV ESD protection
CC
(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 Lead (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 op timized 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 auto ma tic 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.
10nA trickle. Tiny 5mm x 5mm Quad Flat No-
FN8038.3
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
• DTE (ISL4244E/45E) and DCE (ISL4238E) Versions
• Lowest Supply Current in Powerdown . . . . . . . . . . . .10nA
• Active Feedback Resistors on T (ISL4238E)
• Flow Through Pinouts
• Manual and Enhanced Automatic Powerdown Features
• Guaranteed Minimum Data Rate
250kbps (ISL4238E/44E) / 1Mbps (ISL4245E)
• Latch-Up Fre e
• 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.2 4 Specifications at 3V
• RS-232 Compatible with V
• Pb-free Available as an Option
CC
= 2.7V
±15kV (IEC6100)
and Logic Inputs
X
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 f o r ICs”
• Technical Brief TB389 “PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages”
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.
All other trademarks mentioned are the property of their respective owners.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved
ISL4238E, ISL4244E, ISL4245E
www.BDTIC.com/Intersil
TABLE 1. SUMMARY OF FEATURES
ENHANCED
PART
NUMBER
NO. OF
Tx.
NO. OF
Rx. CONFIG. QFN PKG.
MONITOR Rx.
(R
OUTB
ISL4238E 5 3 DCE 5x5 1 250 NO YES YES ISL4244E 3 5 DTE 5x5 1 250 NO YES YES ISL4245E 3 5 DTE 5x5 1 1000 NO YES YES
NO. OF
DATA RATE
)
(kbps)
Rx. ENABLE
FUNCTION?
MANUAL
POWER-
DOWN?
AUTOMATIC
POWERDOWN
FUNCTION?
Ordering Information
PART NO.
(BRAND)
ISL4238EIR (4238EIR)
ISL4238EIRZ (4238EIR) (Note)
ISL4238EIR-T (4238EIR)
ISL4238EIRZ-T (4238EIR) (Note)
ISL4244EIR (4244EIR)
ISL4244EIRZ (4244EIR) (Note)
ISL4244EIR-T (4244EIR)
ISL4244EIRZ-T (4244EIR) (Note)
TEMP.
RANGE (°C) PACKAGE
-40 to 85 32 Ld QFN L32.5x5
-40 to 85 32 Ld QFN (Pb-free) L32.5x5
-40 to 85 Tape & Reel L32.5x5
-40 to 85 Tape & Reel (Pb-free) L32.5x5
-40 to 85 32 Ld QFN L32.5x5
-40 to 85 32 Ld QFN (Pb-free) L32.5x5
-40 to 85 Tape & Reel L32.5x5
-40 to 85 Tape & Reel (Pb-free) L32.5x5
Pinouts
ISL4238E (QFN)
TOP VIEW
PKG.
DWG. #
Ordering Information (Continued)
PART NO.
(BRAND)
ISL4245EIR (4245EIR)
ISL4245EIRZ (4245EIR) (Note)
ISL4245EIR-T (4245EIR)
ISL4245EIRZ-T (4245EIR) (Note)
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J Std-020B.
TEMP.
RANGE (°C) PACKAGE
-40 to 85 32 Ld QFN L32.5x5
-40 to 85 32 Ld QFN (Pb-free) L32.5x5
-40 to 85 Tape & Reel L32.5x5
-40 to 85 Tape & Reel (Pb-free) L32.5x5
ISL4244E, ISL4245E (QFN)
TOP VIEW
PKG.
DWG. #
T1
T2
T3
T4
T5
OUT
OUT
OUT
R1
R2
OUT
R3
OUT
R1
V+
OUTB
V
T5
CC
IN
NC
NC
NC
V-
C2-
C2+
C1+
32 31 30 29 28 27 26 25
C1-
24
T1
IN
23
T2
22
IN
T3
IN
21
R1
20
OUT
R2
19
OUT
T4
18
IN
R3
17
OUT
T1
T2
T3
R1
R2
R3
R4
R5
OUT
OUT
OUT
1
IN
2
IN
3
IN
4
IN
5
IN
6
7
8
9 10111213141516
NC
T3INT2INT1
IN
OUT
R5
C2-
GND
C2+
V-
32 31 30 29 28 27 26 25
1
2
3
4
IN
5
IN
6
7
IN
8
9 10111213141516
NC
FORCEON
FORCEOFF
C1+
NC
INVALID
V+
R4
CC
NC
V
GND
24
C1-
23
FORCEON
22
FORCEOFF
21
INVALID
20
R2
OUTB
19
R1
18
OUT
R2
17
OUT
NC
OUT
OUT
R3
2
ISL4238E, ISL4244E, ISL4245E
www.BDTIC.com/Intersil
Pin Descriptions
PIN FUNCTION
V
CC
V+ Internally generated positive transmitter supply (+5.5V).
V- Internally generated negative transmitter supply (-5.5V).
GND Ground connection.
C1+ External capacitor (voltage doubler) is connected to this lead.
C1- External capacitor (voltage doubler) is connected to this lead.
C2+ External capacitor (voltage inverter) is connected to this lead.
C2- External capacitor (voltage inverter) is connected to this lead. T
T
OUT
R
R
OUT
R
OUTB
INVALID
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see T ab le 2).
FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF
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 V
System power supply input (2.7V to 5.5V).
TTL/CMOS compatible transm it ter I nput s. (Note 1)
IN
±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs. ±15kV ESD Protected, RS-232 compatible receiver in puts.
IN
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.
is removed. Unused transmitter inputs may be left unconnected by the user.
CC
must be high).
3
Typical Operating Circuits
www.BDTIC.com/Intersil
TTL/CMOS
ISL4238E, ISL4244E, ISL4245E
ISL4238E
+3.3V
NOTE 2
LOGIC
LEVELS
0.1µF
0.1µF
R1
+
0.1µF 28
C
1
C
2
T1
T2
T3
T4
T5
OUTB
IN
IN
IN
IN
IN
C1+
V
+
24 29
+
31
23
22
21 3
18 6
15 8
14
CC
C1­C2+
C2-
26
T
1
T
2
T
3
T
4
T
5
V+
27
C
3
+
0.1µF
C
0.1µF
+
OUT
OUT
OUT
OUT
OUT
NOTE 2
4
RS-232 LEVELS
32
V-
1
T1
2
T2
T3
T4
T5
NOTE:
2. For V
5kΩ
5kΩ
5kΩ
4
R1
IN
519
R2
IN
RS-232 LEVELS
717
R3
IN
R1
R2
R3
TO POWER
CONTROL
LOGIC
= 3.15V (3.3V -5%), use C1 - C4 = 0.1µF or greater. For VCC = 3.0V (3.3V -10%), use C1 - C4 = 0.22µF or greater.
CC
20
OUT
OUT
OUT
10
11
V
CC
12
R
1
R
2
R
3
FORCEON
FORCEOFF
INVALID
GND
30
4
ISL4238E, ISL4244E, ISL4245E
www.BDTIC.com/Intersil
Typical Operating Circuits (Continued)
+3.3V
C
1
0.1µF C
2
0.1µF
T1
IN
T2
IN
T3
IN
ISL4244E, ISL4245E
+
0.1µF
28
C1+
+
23
C1-
29
C2+
+
30
C2-
12
11
10 8
26
V
CC
T
T
T
V+
V-
1
2
3
27
C
3
+
0.1µF
31
C
4
0.1µF
+
6
T1
OUT
7
T2
T3
OUT
OUT
RS-232 LEVELS
TTL/CMOS
LOGIC LEVELS
CONTROL LOGIC
R2
OUTB
R1
OUT
R2
OUT
R3
OUT
R4
OUT
R5
OUT
V
CC
TO POWER
19
18
22
FORCEON
21
FORCEOFF
20
INVALID
R
R
R
R
R
1
2
3
4
5
GND
1
R1
IN
5kΩ
217
R2
IN
5kΩ
315
R3
5kΩ
414
R4
5kΩ
513
5kΩ
24
R5
RS-232
IN
LEVELS
IN
IN
5
ISL4238E, ISL4244E, ISL4245E
www.BDTIC.com/Intersil
Absolute Maximum Ratings Thermal Information
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
, FORCEOFF, FORCEON. . . . . . . . . . . . . . . . . . . -0.3V to 6V
T
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V
R
IN
Output Voltages
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±13.2V
T
OUT
, INVALID. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V
R
OUT
Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
T
OUT
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
3. θ
JA
Tech Brief TB379, and Tech Brief TB389.
Thermal Resistance (Typical, Note 3)
32 Ld QFN Package. . . . . . . . . . . . . . . . . . . . . . . . . 32
Moisture Sensitivity (see Technical Brief TB363)
QFN Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
Maximum Storage Temperature Range. . . . . . . . . . -65
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
θ
(oC/W)
JA
o
C to 150oC
Operating Conditions
Temperature Range
ISL42XXEIR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85oC
o
o
C
C
Electrical Specifications Test Conditions: ISL4238E V
ISL424XE V
PARAMETER TEST CONDITIONS
DC CHARACTERISTICS
Operating Voltage Range Full 2.7 - 5.5 V Supply Current, Automatic
Powerdown Supply Current, Powerdown All R
Supply Current, Automatic Powerdown Disabled
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low T Input Logic Threshold High T Transmitter Input Hysteresis 25 - 0.5 - V Input Leakage Current T Output Leakage Current FORCEOFF Output Voltage Low I Output Voltage High I
RECEIVER INPUTS
Input Voltage Range Full -25 - 25 V Input Threshold Low V Input Threshold High V Input Hysteresis 25 - 0.5 - V Input Resistance Full 3 5 7 kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing All Transmitter Outputs Loaded with 3kΩ to Ground Full ±5.0 ±5.4 - V Output Resistance V Output Short-Circuit Current Full - ±35 ±60 mA Output Leakage Current V
All R
IN
IN
All Outputs Unloaded, FORCEON = FORCEOFF
= 3.0V
V
CC
, FORCEON, FORCEOFF Full - - 0.8 V
IN
, FORCEON, FORCEOFF, VCC = 3.6V Full 2.0 - - V
IN
, FORCEON, FORCEOFF (ISL4238E, Note 4) Full - ±0.01 ±1.0 µA
IN
= 1.6mA Full - - 0.4 V
OUT
= -1.0mA Full V
OUT
= 3.0V Full - 1.0 0.6 V
CC
= 3.6V Full 2.4 1.5 - V
CC
= V+ = V- = 0V, Transmitter Output = ±2V Full 300 10M - Ω
CC
OUT
Automatic Powerdown or FORCEOFF
= 3V to 5.5V, C1 - C4 = 0.1µF; Unless Otherwise Specified. Typicals are at TA = 25oC
CC
Open, FORCEON = GND, FORCEOFF = V
Open, FORCEOFF = GND 25 - 3 300 nA
= GND Full - ±0.05 ±10 µA
= ±12V, VCC = 0V or 3V to 5.5V,
= 3.15V to 5.5V, C1 - C4 = 0.1µF; VCC = 3V, C1 - C4 = 0.22µF;
CC
TEMP
o
(
C) MIN TYP MAX UNITS
CC
= VCC,
= GND
25 - 3 300 nA
Full 50 300 nA
Full 50 300 nA
25 - 0.3 1.0 mA
Full 0.3 1.5 mA
-0.6 V
CC
Full - - ±25 µA
-0.1 - V
CC
6
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