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Intersil Electronic Components Datasheet

ICL3238E Datasheet

RS-232 Transceiver

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ICL3238E pdf
®
Data Sheet
July 2004
ICL3238E
FN6012.3
±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 VCC = 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.
Features
• Pb-Free Available as an Option (see Ordering Info)
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Active Feedback Resistors on TX 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
• RS-232 Compatible Outputs at 2.7V Supply
• 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/µs
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . 10nA
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
Table 1 summarizes the features of the ICL3238E, while
Application Note AN9863 summarizes the features of each
device comprising the ICL32XXE 3V family.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ICL3238E
NO. OF NO. OF
Tx. Rx.
53
NO. OF
MONITOR Rx.
(ROUTB)
1
DATA
RATE
(kbps)
250
Rx. ENABLE
FUNCTION?
No
READY
OUTPUT?
No
MANUAL
POWER-
DOWN?
Yes
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
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, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.



Intersil Electronic Components Datasheet

ICL3238E Datasheet

RS-232 Transceiver

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ICL3238E pdf
ICL3238E
Pinout
ICL3238E (SSOP, TSSOP)
TOP VIEW
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
FORCEON 13
FORCEOFF 14
28 C1+
27 V+
26 VCC
25 C1-
24 T1IN
23 T2IN
22 T3IN
21 R1OUT
20 R2OUT
19 T4IN
18 R3OUT
17 T5IN
16 R1OUTB
15 INVALID
Ordering Information
TEMP.
PART NO. RANGE (oC)
PACKAGE
PKG.
DWG. #
ICL3238ECA
0 to 70 28 Ld SSOP
M28.209
ICL3238ECA-T
0 to 70 28 Ld SSOP
Tape and Reel
M28.209
ICL3238ECAZ
(Note)
0 to 70 28 Ld SSOP (Pb-Free) M28.209
ICL3238ECAZ-T
(Note)
0 to 70 28 Ld SSOP
M28.209
Tape and Reel (Pb-Free)
ICL3238EIA
-40 to 85 28 Ld SSOP
M28.209
ICL3238EIA-T
-40 to 85 28 Ld SSOP
Tape and Reel
M28.209
ICL3238EIAZ
(Note)
-40 to 85 28 Ld SSOP
(Pb-Free)
M28.209
ICL3238EIAZ-T
(Note)
-40 to 85 28 Ld SSOP
M28.209
Tape and Reel (Pb-Free)
ICL3238EIV-T
-40 to 85 28 Ld TSSOP
Tape and Reel
M28.173
ICL3238EIVZ-T
(Note)
-40 to 85 28 Ld TSSOP
M28.173
Tape and Reel (Pb-Free)
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.
Pin Descriptions
PIN FUNCTION
VCC System Power Supply Input (3.0V to 5.5V).
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.
TIN
TOUT
RIN
ROUT
ROUTB
INVALID
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.
FORCEOFF Active Low to Shut Down Transmitters and On-Chip Power Supply. This overrides any automatic circuitry and FORCEON (see Table 2,
Note 1).
FORCEON Active High Input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high, Note 1).
NOTE:
1. 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 VCC is removed. Unused transmitter inputs may be left unconnected by the user.
2



Intersil Electronic Components Datasheet

ICL3238E Datasheet

RS-232 Transceiver

No Preview Available !

ICL3238E pdf
ICL3238E
Typical Operating Circuit
ICL3238E
+3.3V
+
0.1µF
C1
0.1µF
NOTE 3 C2
0.1µF
28
+ C1+
25 C1-
+ 1 C2+
3 C2-
24
T1IN
23
T2IN
22
T3IN
19
T4IN
TTL/CMOS
LOGIC LEVELS
17
T5IN
R1OUTB
R1OUT
16
21
26
VCC
T1
T2
T3
T4
T5
R1
20
R2OUT
R2
R3OUT
18
R3
13
FORCEON
VCC
TO POWER
CONTROL LOGIC
14
FORCEOFF
15
INVALID GND
2
C3 (OPTIONAL CONNECTION, NOTE 2)
V+
27 + C3
0.1µF
V- 4
5
NOTE 3
C4
+0.1µF
T1OUT
6
T2OUT
7
T3OUT RS-232
LEVELS
10
T4OUT
12
T5OUT
8
5k
9
5k
11
5k
R1IN
R2IN
R3IN
RS-232
LEVELS
NOTES:
2. The negative terminal of C3 can be connected to either VCC or GND.
3. For VCC = 3.15V (3.3V -5%), use C1 - C4 = 0.1µF or greater. For VCC = 3.0V (3.3V -10%), use C1 - C4 = 0.22µF.
3




Part Number ICL3238E
Description RS-232 Transceiver
Maker Intersil
Total Page 14 Pages
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