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PDF ICL3223E Data sheet ( Hoja de datos )
| Número de pieza | ICL3223E | |
| Descripción | (ICL32xxE) RS-232 Transmitters/Receivers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ICL3221E, ICL3222E, ICL3223E,
ICL3232E, ICL3241E, ICL3243E
June 22, 2007
FN4910.19
±15kV ESD Protected, +3V to +5.5V,
1Microamp, 250kbps, RS-232
Transmitters/Receivers
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 VCC = 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 automatic powerdown functions
(except for the ICL3232E), 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 250kbps 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 ICL324XE are 3-driver, 5-receiver devices that provide a
complete serial port suitable for laptop or notebook
computers. Both devices also include noninverting
always-active receivers for “wake-up” capability.
The ICL3221E, ICL3223E and ICL3243E, feature an
automatic powerdown function which 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
www.cDhaatanSgheesett4oUt.hceomhardware or operating system. These
devices power up again when a valid RS-232 voltage is
applied to any receiver input.
Table 1 summarizes the features of the devices represented
by this data sheet, 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)
• Drop in Replacements for MAX3221E, MAX3222E,
MAX3223E, MAX3232E, MAX3241E, MAX3243E,
SP3243E
• ICL3221E is a Low Power, Pin Compatible Upgrade for 5V
MAX221E
• ICL3222E is a Low Power, Pin Compatible Upgrade for 5V
MAX242E, and SP312E
• ICL3232E is a Low Power Upgrade for HIN232E, ICL232
and Pin Compatible Competitor Devices
• RS-232 Compatible with VCC = 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
• Manual and Automatic Powerdown Features
• Guaranteed Mouse Driveability (ICL324XE Only)
• Receiver Hysteresis For Improved Noise Immunity
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Wide Power Supply Range . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . . . .1µA
• Pb-Free Plus Anneal Available (RoHS Compliant)
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
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
PART
NUMBER
ICL3221E
ICL3222E
ICL3223E
ICL3232E
ICL3241E
ICL3243E
NUMBER NUMBER
OF Tx OF Rx
11
22
22
22
35
35
TABLE 1. SUMMARY OF FEATURES
NUMBER OF
MONITOR
RECEIVERS
(ROUTB)
0
DATA
RATE
(kbps)
250
RECEIVER
ENABLE
FUNCTION?
Yes
0 250 Yes
0 250 Yes
0 250 No
2 250 Yes
1 250 No
READY
OUTPUT?
No
No
No
No
No
No
MANUAL
AUTOMATIC
POWERDOWN
POWER-DOWN? FUNCTION?
Yes Yes
Yes No
Yes Yes
No No
Yes No
Yes Yes
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2000-2005, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
Pinouts (Continued)
ICL3241E
(28 LD SOIC, SSOP, TSSOP)
TOP VIEW
C2+ 1
C2- 2
V- 3
R1IN 4
R2IN 5
R3IN 6
R4IN 7
R5IN 8
T1OUT 9
T2OUT 10
T3OUT 11
T3IN 12
T2IN 13
T1IN 14
28 C1+
27 V+
26 VCC
25 GND
24 C1-
23 EN
22 SHDN
21 R1OUTB
20 R2OUTB
19 R1OUT
18 R2OUT
17 R3OUT
16 R4OUT
15 R5OUT
ICL3243E
(28 LD SOIC, SSOP, TSSOP)
TOP VIEW
C2+ 1
C2- 2
V- 3
R1IN 4
R2IN 5
R3IN 6
R4IN 7
R5IN 8
T1OUT 9
T2OUT 10
T3OUT 11
T3IN 12
T2IN 13
T1IN 14
28 C1+
27 V+
26 VCC
25 GND
24 C1-
23 FORCEON
22 FORCEOFF
21 INVALID
20 R2OUTB
19 R1OUT
18 R2OUT
17 R3OUT
16 R4OUT
15 R5OUT
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.
www.DataSThINeet4U.cToTmL/CMOS compatible transmitter Inputs.
TOUT ±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs.
RIN ±15kV ESD Protected, RS-232 compatible receiver inputs.
ROUT TTL/CMOS level receiver outputs.
ROUTB TTL/CMOS level, noninverting, always enabled receiver outputs.
INVALID Active low output that indicates if no valid RS-232 levels are present on any receiver input.
EN
SHDN
Active low receiver enable control; doesn’t disable ROUTB outputs.
Active low input to shut down transmitters and on-board power supply, to place device in low power mode.
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).
5 FN4910.19
June 22, 2007
5 Page 
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
Detailed Description
ICL32xxE interface ICs operate from a single +3V to +5.5V
supply, guarantee a 250kbps minimum data rate, require
only four small external 0.1μF capacitors, feature low power
consumption, and meet all ElA RS-232C and V.28
specifications. The circuit is divided into three sections:
charge pump, transmitters and receivers.
Charge-Pump
Intersil’s new ICL32xxE family utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate ±5.5V transmitter supplies from a VCC supply as
low as 3.0V. This allows these devices to maintain RS-232
compliant output levels over the ±10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1μF capacitors for the
voltage doubler and inverter functions at VCC = 3.3V. See
“Capacitor Selection” on page 14., and Table 3 for capacitor
recommendations for other operating conditions. The charge
pumps operate discontinuously (i.e., they turn off as soon as
the V+ and V- supplies are pumped up to the nominal
values), resulting in significant power savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip ±5.5V supplies,
these transmitters deliver true RS-232 levels over a wide
range of single supply system voltages.
Except for the ICL3232E, all transmitter outputs disable and
assume a high impedance state when the device enters the
powerdown mode (see Table 2). These outputs may be
driven to ±12V when disabled.
All devices guarantee a 250kbps data rate for full load
www.cDoantadSithioenest4U(3.ckoΩmand 1000pF), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL = 3kΩ, and CL = 250pF, one
transmitter easily operates at 900kbps.
Transmitter inputs float if left unconnected, and may cause
ICC increases. Connect unused inputs to GND for the best
performance.
Receivers
All the ICL32xxE devices contain standard inverting receivers
that three-state (except for the ICL3232E) via the EN or
FORCEOFF control lines. Additionally, the two ICL324XE
products include noninverting (monitor) receivers (denoted by
the ROUTB label) that are always active, regardless of the
state of any control lines. All the receivers convert RS-232
signals to CMOS output levels and accept inputs up to ±25V
while presenting the required 3kW to 7kW input impedance
(see Figure 1) even if the power is off (VCC = 0V). The
receivers’ Schmitt trigger input stage uses hysteresis to
increase noise immunity and decrease errors due to slow
input signal transitions.
The ICL3221E, ICL3222E, ICL3223E, ICL3241E inverting
receivers disable only when EN is driven high. ICL3243E
receivers disable during forced (manual) powerdown, but not
during automatic powerdown (see Table 2).
ICL3241E and ICL3243E monitor receivers remain active
even during manual powerdown and forced receiver disable,
making them extremely useful for Ring Indicator monitoring.
Standard receivers driving powered down peripherals must be
disabled to prevent current flow through the peripheral’s
protection diodes (see Figures 2 and 3). This renders them
useless for wake up functions, but the corresponding monitor
receiver can be dedicated to this task as shown in Figure 3.
VCC
RXIN
-25V ≤ VRIN ≤ +25V
GND
5kΩ
RXOUT
GND ≤ VROUT ≤ VCC
FIGURE 1. INVERTING RECEIVER CONNECTIONS
Low Power Operation
These 3V devices require a nominal supply current of
0.3mA, even at VCC = 5.5V, during normal operation (not in
powerdown mode). This is considerably less than the 5mA
to 11mA current required by comparable 5V RS-232 devices,
allowing users to reduce system power simply by switching
to this new family.
Pin Compatible Replacements for 5V Devices
The ICL3221E, ICL3222E, ICL3232E are pin compatible
with existing 5V RS-232 transceivers - See the “Features”
section on page 1 for details.
This pin compatibility coupled with the low ICC and wide
operating supply range, make the ICL32xxE potential lower
power, higher performance drop-in replacements for existing
5V applications. As long as the ±5V RS-232 output swings are
acceptable, and transmitter input pull-up resistors aren’t
required, the IICL32xxE should work in most 5V applications.
When replacing a device in an existing 5V application, it is
acceptable to terminate C3 to VCC as shown on the “Typical
Operating Circuits” on page 6. Nevertheless, terminate C3 to
GND if possible, as slightly better performance results from
this configuration.
Powerdown Functionality
(Except ICL3232E)
The already low current requirement drops significantly when
the device enters powerdown mode. In powerdown, supply
current drops to 1µA, because the on-chip charge pump turns
off (V+ collapses to VCC, V- collapses to GND), and the
transmitter outputs three-state. Inverting receiver outputs may
or may not disable in powerdown; refer to Table 2 for details.
This micro-power mode makes these devices ideal for
battery powered and portable applications.
11 FN4910.19
June 22, 2007
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ICL3223E.PDF ] | |
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