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ICL3238E
Data Sheet
September 2003
FN6012.2
±15kV
ESD Protected, +3V to +5.5V, 10nA,
250kbps, RS-232 Transceiver with
Enhanced Automatic Powerdown
The Intersil ICL3238E contains 3.0V 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, it
provides
±
15kV ESD protection (IEC61000-4-2 Air Gap and
Human Body Model) on transmitter outputs and receiver
inputs (RS-232 pins). Targeted applications are cell phones,
Palmtops, and data cables where the low operational, and
even lower standby, power consumption is critical. Efficient
on-chip charge pumps, coupled with manual and enhanced
automatic powerdown functions, reduce the standby supply
current to a 10nA trickle. Small footprint 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 providing
compatibility with popular PC communication software.
The ICL3238E 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.
This device, features an
enhanced automatic powerdown
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. The
ICL3238E powers back up, automatically, whenever it
senses a transition on any transmitter or receiver input.
The transmitter and logic inputs include active feedback
resistors that retain the input state once driven to a valid
logic level.
Table 1 summarizes the features of the ICL3238E, while
Application Note AN9863 summarizes the features of each
device comprising the ICL32XXE 3V family.
Features
• ESD Protection for RS-232 I/O Pins to
±
15kV (IEC61000)
• Active Feedback Resistors on T
X
and Logic Inputs.
• Manual and Enhanced Automatic Powerdown Features
• Pin Compatible Replacement for MAX3238E, MAX3238,
SP3238E
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Flow Through Pinout
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
Capacitors
• Receiver and Transmitter Hysteresis For Improved Noise
Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/
µ
s
• Wide Power Supply Range. . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State . . . . . . . . . 10nA
• RS-232 Compatible Outputs at 2.7V Supply
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Data Cradles
- Modems, Printers and other Peripherals
- Cellular/Mobile Phones, Data Cables
Pinout
ICL3238E (SSOP, TSSOP)
TOP VIEW
C2+
GND
C2-
1
2
3
4
5
6
7
8
9
28 C1+
27 V+
26 V
CC
25 C1-
24 T1
IN
23 T2
IN
22 T3
IN
21 R1
OUT
20 R2
OUT
19 T4
IN
18 R3
OUT
17 T5
IN
16 R1
OUTB
15 INVALID
Ordering Information
PART NO.
(BRAND)
ICL3238ECA
ICL3238EIA
ICL3238EIAH-T
(ICL3238EIA)
ICL3238ECV
ICL3238EIV
NOTES:
1. Most surface mount devices are available on tape and reel; add
“-T” to suffix.
2. Compatible with high temperature (260
o
C) reflow soldering
processes.
TEMP.
RANGE (
o
C)
0 to 70
-40 to 85
-40 to 85
0 to 70
-40 to 85
PACKAGE
28 Ld SSOP
28 Ld SSOP
PKG. DWG. #
M28.209
M28.209
V-
T1
OUT
T2
OUT
T3
OUT
R1
IN
R2
IN
28 Ld SSOP Tape M28.209
& Reel (Note 2)
28 Ld TSSOP
28 Ld TSSOP
M28.173
M28.173
T4
OUT
10
R3
IN
11
T5
OUT
12
FORCEON 13
FORCEOFF 14
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.
All other trademarks mentioned are the property of their respective owners.
ICL3238E
TABLE 1. SUMMARY OF FEATURES
NO. OF
MONITOR Rx.
(R
OUTB
)
1
DATA
RATE
(kbps)
250
MANUAL
POWER-
DOWN?
Yes
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
PART
NUMBER
ICL3238E
NO. OF NO. OF
Tx.
Rx.
5
3
Rx. ENABLE
FUNCTION?
No
READY
OUTPUT?
No
Pin Descriptions
PIN
V
CC
V+
V-
GND
C1+
C1-
C2+
C2-
T
IN
T
OUT
R
IN
R
OUT
R
OUTB
INVALID
FORCEOFF
FORCEON
NOTE:
3. These 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
CC
is removed. Unused transmitter inputs may be left unconnected by the user.
System Power Supply Input (3.0V 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 3).
±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.
Active Low to Shut Down Transmitters and On-Chip Power Supply. This overrides any automatic circuitry and FORCEON (see Table 2,
Note 3).
Active High Input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high,
Note 3).
FUNCTION
2
ICL3238E
Typical Operating Circuit
ICL3238E
C
3
(OPTIONAL CONNECTION, NOTE 4)
0.1µF
C
1
0.1µF
C
2
0.1µF
28
+
25
1
+
3
24
T1
IN
23
T2
IN
22
T3
IN
19
T4
IN
17
T5
IN
TTL/CMOS
LOGIC LEVELS
R1
OUTB
R1
OUT
R
1
20
R2
OUT
R
2
18
R3
OUT
R
3
13
FORCEON
V
CC
TO POWER
CONTROL LOGIC
14
FORCEOFF
15
INVALID
GND
2
5kΩ
5kΩ
11
R3
IN
5kΩ
9
R2
IN
RS-232
LEVELS
16
21
8
R1
IN
T
5
12
T5
OUT
T
4
10
T4
OUT
T
3
7
T3
OUT
T
2
C1+
C1-
C2+
C2-
T
1
V-
V
CC
27
V+
4
+
+
C
3
0.1µF
NOTE 5
C
4
0.1µF
+
T1
OUT
T2
OUT
RS-232
LEVELS
5
6
+
26
+3.3V
NOTE 5
NOTES:
4. The negative terminal of C
3
can be connected to either V
CC
or GND.
5. For V
CC
= 3.15V (3.3V -5%), use C
1
- C
4
= 0.1µF or greater. For V
CC
= 3.0V (3.3V -10%), use C
1
- C
4
= 0.22µF.
3
ICL3238E
Absolute Maximum Ratings
V
CC
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
T
IN
, FORCEOFF, FORCEON. . . . . . . . . . . . . . . . . . . -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, Note 6)
θ
JA
(
o
C/W)
28 Ld TSSOP Package . . . . . . . . . . . . . . . . . . . . . .
100
28 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
110
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(Lead Tips Only)
Operating Conditions
Temperature Range
ICL3238ECX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to 70
o
C
ICL3238EIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
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:
6.
θ
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: V
CC
= 3.15V to 5.5V, C
1
- C
4
= 0.1µF; V
CC
= 3V, C
1
- C
4
= 0.22µF; Unless Otherwise
Specified. Typicals are at T
A
= 25
o
C
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
PARAMETER
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
Supply Current, Powerdown
Supply Current,
Automatic Powerdown Disabled
All R
IN
Open, FORCEON = GND, FORCEOFF = V
CC
FORCEOFF = GND
All Outputs Unloaded, FORCEON = FORCEOFF = V
CC
25
25
25
-
-
-
10
10
0.3
300
300
1.0
nA
nA
mA
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold Low
T
IN
Active
T
IN
, FORCEON, FORCEOFF
Wake up Threshold
Input Logic Threshold High
T
IN
Active
T
IN
, FORCEON, FORCEOFF
Wake up Threshold
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
V
CC
= 3.3V
V
CC
= 5.0V
Input Threshold High
V
CC
= 3.3V
V
CC
= 5.0V
Input Hysteresis
Input Resistance
Full
Full
Full
Full
Full
25
25
-25
0.6
0.8
-
-
-
3
-
1.2
1.5
1.5
1.8
0.6
5
25
-
-
2.4
2.4
-
7
V
V
V
V
V
V
kΩ
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.6V
V
CC
= 3.3V
V
CC
= 5.0V
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
-
-
-
2.0
2.0
2.4
-
-
-
-
-
-
-
-
-
±0.01
±0.05
-
0.8
0.8
0.8
-
-
-
±1.0
±10
0.4
-
V
V
V
V
V
V
µA
µA
V
V
T
IN
, FORCEON, FORCEOFF, V
IN
= 0V or V
CC
(Note 7)
FORCEOFF = GND
I
OUT
= 1.0mA
I
OUT
= -1.0mA
V
CC
-0.6 V
CC
-0.1
4
