DATASHEET
ISL3232E, ISL4221E, ISL4223E
QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 150nA, 250kbps, RS-232
Transmitters/Receivers
The Intersil ISL3232E and ISL4221E, ISL4223E 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
V
CC
= 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 power-down functions,
reduce the standby supply current to a 150nA trickle. Tiny
5mmx5mm
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
ISL3232E and ISL4223E are 2 driver, 2 receiver devices
that, coupled with the 5mmx5mm QFN package, provide the
industry’s smallest, lowest power serial port suitable for
PDAs, and hand-held applications. The 5mmx5mm QFN
requires 40% less board area than a 20 Ld TSSOP, and is
nearly 20% thinner.
The
ISL4221E, ISL4223E
versions feature an
automatic
power-down
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 IC’s, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
FN6045
Rev 6.00
May 13, 2010
Features
• Available in Near Chip Scale QFN (5mmx5mm) Package,
which is 40% Smaller than a 20 Ld 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 V
CC
= 2.7V
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Manual and Automatic Power-down Features (Except
ISL3232E)
• 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 Power-down State . . . . . . . .150nA
• Pb-Free Available (RoHS Compliant)
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
PART NUMBER
ISL4221E
ISL3232E
ISL4223E
NO. OF NO. OF
Tx.
Rx.
1
2
2
1
2
2
QFN PKG.
AVAILABLE?
YES
YES
YES
DATA RATE
(kbps)
250
250
250
Rx. ENABLE
FUNCTION?
YES
NO
YES
MANUAL
POWER-DOWN?
YES
NO
YES
AUTOMATIC POWER-DOWN
FUNCTION?
YES
NO
YES
FN6045 Rev 6.00
May 13, 2010
Page 1 of 14
ISL3232E, ISL4221E, ISL4223E
Ordering Information
PART
NUMBER
ISL3232EIRZ* (Note)
ISL4221EIR*
ISL4221EIRZ* (Note)
ISL4223EIR*
ISL4223EIRZ* (Note)
PART
MARKING
ISL3232 EIRZ
ISL 4221EIR
ISL4221 EIRZ
ISL 4223EIR
ISL4223 EIRZ
TEMP.
RANGE (°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
16 Ld QFN
16 Ld QFN (Pb-free)
20 Ld QFN
20 Ld QFN (Pb-free)
PACKAGE
16 Ld QFN (Pb-free)
PKG.
DWG. #
L16.5x5B
L16.5x5B
L16.5x5B
L20.5x5
L20.5x5
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and 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-020.
Pinouts
ISL3232E
(16 LD QFN)
TOP VIEW
GND
VCC
C1+
V+
ISL4221E
(16 LD QFN)
TOP VIEW
FORCEOFF
14
C1-
C2+
C2-
V-
1
2
PD
3
4
5
T2OUT
6
R2IN
7
R2OUT
8
T2IN
12 T1OUT
11 R1IN
10 R1OUT
9
T1IN
V+
C1-
C2+
C2-
1
2
16
15
VCC
13
12 GND
11 T1OUT
10 FORCEON
9
T1IN
8
INVALID
C1+
EN
6
R1IN
16
15
14
13
PD
3
4
5
V-
7
R1OUT
ISL4223E
(20 LD QFN)
TOP VIEW
FORCEOFF
20
V+
C1-
C2+
C2-
V-
1
2
3
4
5
6
T2OUT
19
18
17
GND
16
15 T1OUT
14 R1IN
13 R1OUT
12 FORCEON
11 T1IN
10
T2IN
PD
7
R2IN
8
R2OUT
FN6045 Rev 6.00
May 13, 2010
INVALID
VCC
9
C1+
EN
Page 2 of 14
ISL3232E, ISL4221E, ISL4223E
Pin Descriptions
PIN
VCC
V+
V-
GND
C1+
C1-
C2+
C2-
TIN
TOUT
RIN
ROUT
INVALID
FORCEON
EN
PD
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. This is also the potential of the thermal pad (PD)
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.
Active high input to override automatic power-down circuitry thereby keeping transmitters active. (FORCEOFF must be high).
Active low receiver enable control.
Exposed Thermal Pad. Connect to GND.
FUNCTION
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2).
Typical Operating Circuits
ISL3232E
+3.3V
+
+
0.1µF
15
1
2
+
3
9
8
C1+
C1-
C2+
C2-
T
1
T
2
V-
14
V
CC
V+
16
C
+
3
0.1µF
C
4
0.1µF
+
T1
OUT
T2
OUT
RS-232
LEVELS
C
1
0.1µF
C
2
0.1µF
4
12
5
T1
IN
T2
IN
TTL/CMOS
LOGIC LEVELS
R1
OUT
10
R
1
5k
11
R1
IN
R2
OUT
7
R
2
5k
6
R2
IN
GND
13
FN6045 Rev 6.00
May 13, 2010
Page 3 of 14
ISL3232E, ISL4221E, ISL4223E
Typical Operating Circuits
ISL4221E
+3.3V
+
0.1µF
13
V
CC
V+
1
+ C
3
0.1µF
C
4
+ 0.1µF
T1
OUT
R1
IN
RS-232
LEVELS
C
1
0.1µF
C
2
0.1µF
16
+ C1+
2
C1-
3
+ C2+
4
C2-
9
V- 5
T
1
11
TTL/CMOS
LOGIC
LEVELS R1
OUT
T1
IN
7
R
1
15 EN
FORCEOFF
10
FORCEON
GND
12
INVALID
5k
6
14
8
V
CC
TO POWER
CONTROL LOGIC
ISL4223E
+3.3V
+
0.1µF
20
2
3
4
11
10
C1+
C1-
C2+
C2-
T
1
T
2
V-
17
V
CC
V+
1
C
+
3
0.1µF
C
4
0.1µF
+
T1
OUT
T2
OUT
RS-232
LEVELS
C
1
0.1µF
C
2
0.1µF
+
+
5
15
6
T1
IN
T2
IN
TTL/CMOS
LOGIC LEVELS
R1
OUT
13
R
1
5k
14
R1
IN
R2
OUT
8
19
EN
R
2
5k
7
R2
IN
FORCEOFF
12
FORCEON
GND
16
INVALID
18
9
V
CC
TO POWER
CONTROL LOGIC
FN6045 Rev 6.00
May 13, 2010
Page 4 of 14
ISL3232E, ISL4221E, ISL4223E
Absolute Maximum Ratings
V
CC
to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V+ to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
T
IN
, FORCEOFF, FORCEON, EN . . . . . . . . . . . . . . . -0.3V to 6V
R
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25V
Output Voltages
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.2V
R
OUT
, INVALID. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
CC
+0.3V
Short Circuit Duration
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
16 Ld QFN Package (Notes 1, 2). . . . .
35
4.3
20 Ld QFN Package (Notes 1, 2). . . . .
32
4.3
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
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
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
1.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379, and Tech Brief TB389.
2. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
through C
4
= 0.1µF; Unless Otherwise Specified.
Typicals are at T
A
= +25°C
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 4)
TYP
MAX
(Note 4)
UNITS
PARAMETER
DC CHARACTERISTICS
Supply Current, Automatic Power-down All R
IN
Open, FORCEON = GND, FORCEOFF = V
CC
(Except ISL3232E)
Supply Current, Power-down
Supply Current,
Automatic Power-down Disabled
FORCEOFF = GND (Except ISL3232E)
V
CC
= 3.15V
All Outputs Unloaded,
FORCEON = FORCEOFF = V
CC
T
IN
, FORCEON, FORCEOFF, EN
T
IN
, FORCEON, FORCEOFF, EN V
CC
= 3.3V
V
CC
= 5.0V
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
T
IN
, FORCEON, FORCEOFF, EN
EN = V
CC
(Except ISL3232E)
I
OUT
= 1.6mA
I
OUT
= -1.0mA
ISL4221E, ISL4223E Powers Up (See Figure 6)
ISL4221E, ISL4223E Powers Down (See Figure 6)
I
OUT
= 1.6mA
I
OUT
= -1.0mA
25
25
25
-
-
-
0.15
0.15
0.3
1
1
1.0
µA
µA
mA
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
Input Logic Threshold High
Full
Full
Full
Full
Full
Full
Full
-
2.0
2.4
-
-
-
-
-
-
±0.01
±0.05
-
0.8
-
-
±1.0
±10
0.4
-
V
V
V
µA
µA
V
V
V
CC
- 0.6 V
CC
- 0.1
-2.7
-0.3
-
V
CC
- 0.6
-
-
-
-
-
-
-
100
1
30
AUTOMATIC POWER-DOWN
(FORCEON = GND, FORCEOFF = V
CC
, Except ISL3232E)
Receiver Input Thresholds to Enable
Transmitters
Receiver Input Thresholds to Disable
Transmitters
INVALID Output Voltage Low
INVALID Output Voltage High
Receiver Threshold to Transmitters
Enabled Delay (t
WU
)
Receiver Positive or Negative Threshold
to INVALID High Delay (t
INVH
)
Receiver Positive or Negative Threshold
to INVALID Low Delay (t
INVL
)
Full
Full
Full
Full
25
25
25
2.7
0.3
0.4
-
-
-
-
V
V
V
V
µs
µs
µs
FN6045 Rev 6.00
May 13, 2010
Page 5 of 14
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