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ICL3225E, ICL3227E, ICL3245E
Data Sheet
February 27, 2006
FN4900.9
±15kV
ESD Protected, +3V to +5.5V,
1Microamp, 1Mbps, RS-232 Transceivers
with Enhanced Automatic Powerdown
The Intersil ICL32XXE devices are 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,
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 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 powerdown
functions, reduce the standby supply current to a 1µA trickle.
Small footprint packaging, and the use of small, low value
capacitors ensure board space savings as well. Data rates
greater than 1Mbps are guaranteed at worst case load
conditions. This family is fully compatible with 3.3V only
systems, mixed 3.3V and 5.0V systems, and 5.0V only
systems.
The ICL3245E is a 3 driver, 5 receiver device that provides a
complete serial port suitable for laptop or notebook
computers. It also includes a noninverting always-active
receiver for “wake-up” capability.
These devices, feature 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. These devices power back up, automatically, whenever
they sense a transition on any transmitter or receiver input.
Table 1 summarizes the features of the device represented
by this data sheet, while Application Note AN9863
summarizes the features of each device comprising the
ICL32XXE 3V family.
Features
• Pb-Free Plus Anneal Available (RoHS Compliant)
(see Ordering Info)
• ESD Protection for RS-232 I/O Pins to
±
15kV (IEC61000)
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3225E, MAX3227E,
MAX3245E
• RS-232 Compatible with V
CC
= 2.7V
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Guaranteed Mouse Driveability (ICL3245E)
• “Ready to Transmit” Indicator Output
(ICL3225E/ICL3227E)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . . 1Mbps
• Low Skew at Transmitter/Receiver Input Trip Points . . . 10ns
• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . 24V/µs
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . . .1µA
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Modems, Printers and Other Peripherals
- Digital Cameras
- Cellular/Mobile Phones
TABLE 1. SUMMARY OF FEATURES
NO. OF
MONITOR Rx.
(R
OUTB
)
0
0
1
DATA
RATE
(kbps)
1000
1000
1000
MANUAL
POWER-
DOWN?
Yes
Yes
Yes
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
Yes
Yes
NO. OF NO. OF
PART NUMBER
Tx.
Rx.
ICL3225E
ICL3227E
ICL3245E
2
1
3
2
1
5
Rx. ENABLE
FUNCTION?
No
No
No
READY
OUTPUT?
Yes
Yes
No
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2000, 2001, 2003-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ICL3225E, ICL3227E, ICL3245E
Pinouts
(Continued)
ICL3245E (SOIC, SSOP, TSSOP)
TOP VIEW
C2+ 1
C2- 2
V-
3
28 C1+
27 V+
26 V
CC
25 GND
24 C1-
23 FORCEON
22 FORCEOFF
21 INVALID
20 R2
OUTB
19 R1
OUT
18 R2
OUT
17 R3
OUT
16 R4
OUT
15 R5
OUT
R1
IN
4
R2
IN
5
R3
IN
6
R4
IN
7
R5
IN
8
T1
OUT
9
T2
OUT
10
T3
OUT
11
T3
IN
12
T2
IN
13
T1
IN
14
Pin Descriptions
PIN
V
CC
V+
V-
GND
C1+
C1-
C2+
C2-
T
IN
T
OUT
R
IN
R
OUT
R
OUTB
INVALID
READY
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.
±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 high output that indicates when the ICL32XXE is ready to transmit (i.e., V-
≤
-4V).
FUNCTION
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2).
FORCEON
Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
3
FN4900.9
February 27, 2006
DSP and ARM Processors
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