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PDF ICL3224E Data sheet ( Hoja de datos )
| Número de pieza | ICL3224E | |
| Descripción | (ICL3224E - ICL3244E) RS-232 Transceivers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ICL3224E, ICL3226E, ICL3244E
February 27, 2006
FN4899.6
+/-15kV ESD Protected, +3V to +5.5V,
1Microamp, 250kbps, 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 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 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 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 ICL3244E is a 3 driver, 5 receiver device that provides a
www.DataSheet4U.cocmomplete 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
30 seconds. These devices power back up, automatically,
whenever they sense a transition on any transmitter or
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
• Pb-Free Plus Anneal Available (RoHS Compliant)
• ESD Protection for RS-232 I/O Pins to ±15kV (IEC61000)
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3224E, MAX3226E,
MAX3244E
• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
• RS-232 Compatible with VCC = 2.7V
• Latch-Up Free
• On-Chip Voltage Converters Require Only Four External
0.1µF Capacitors
• Guaranteed Mouse Driveability (ICL3244E)
• “Ready to Transmit” Indicator Output (ICL3224E/26E)
• Receiver 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 . . . . . . . . . . .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
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ICL3224E
ICL3226E
ICL3244E
NO. OF NO. OF
Tx. Rx.
22
11
35
NO. OF
MONITOR Rx.
(ROUTB)
0
0
1
DATA
RATE
(kbps)
250
250
250
Rx. ENABLE
FUNCTION?
No
No
No
READY
OUTPUT?
Yes
Yes
No
MANUAL
POWER-
DOWN?
Yes
Yes
Yes
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
Yes
Yes
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.
1 page  
ICL3224E, ICL3226E, ICL3244E
Typical Operating Circuits (Continued)
+3.3V
C1
0.1µF
C2
0.1µF
ICL3244E
+
0.1µF
28
+ C1+
24 C1-
+ 1 C2+
2 C2-
26
VCC
14
T1IN
T1
13
T2IN
T2
12
T3IN
T3
20
R2OUTB
TTL/CMOS
LOGIC LEVELS
19
R1OUT
R1
18
R2OUT
R2
17
R3OUT
16
R4OUT
R3
R4
R5OUT
15
23 R5
FORCEON
VCC
TO POWER
CONTROL LOGIC
22
FORCEOFF
21
INVALID GND
25
V+
27
+
C3
0.1µF
V- 3 C4
+0.1µF
9
T1OUT
10 RS-232
T2OUT LEVELS
11
T3OUT
4
5kΩ
5
5kΩ
6
5kΩ
7
5kΩ
8
5kΩ
R1IN
R2IN
R3IN
R4IN
R5IN
RS-232
LEVELS
5
5 Page 
ICL3224E, ICL3226E, ICL3244E
POWER
MANAGEMENT
UNIT
MASTER POWERDOWN LINE
0.1µF
1MΩ
FORCEOFF FORCEON
ICL32XXE
FIGURE 5. CIRCUIT TO ENSURE IMMEDIATE POWER UP
WHEN EXITING FORCED POWERDOWN
INVALID Output
The INVALID output always indicates (see Table 2) whether
or not 30µs have elapsed with invalid RS-232 signals (see
Figures 6 and 8) persisting on all of the receiver inputs,
giving the user an easy way to determine when the interface
block should power down. Invalid receiver levels occur
whenever the driving peripheral’s outputs are shut off
(powered down) or when the RS-232 interface cable is
disconnected. In the case of a disconnected interface cable
where all the receiver inputs are floating (but pulled to GND
by the internal receiver pull down resistors), the INVALID
logic detects the invalid levels and drives the output low. The
power management logic then uses this indicator to power
down the interface block. Reconnecting the cable restores
valid levels at the receiver inputs, INVALID switches high,
and the power management logic wakes up the interface
block. INVALID can also be used to indicate the DTR or
RING INDICATOR signal, as long as the other receiver
inputs are floating, or driven to GND (as in the case of a
powered down driver).
2.7V
VALID RS-232 LEVEL - INVALID = 1
INDETERMINATE
0.3V
-0.3V
INVALID LEVEL - INVALID = 0
INDETERMINATE
-2.7V
VALID RS-232 LEVEL - INVALID = 1
FIGURE 6. DEFINITION OF VALID RS-232 RECEIVER LEVELS
Enhanced Automatic Powerdown
Even greater power savings is available by using these
devices which feature an enhanced automatic powerdown
function. When the enhanced powerdown logic determines
that no transitions have occurred on any of the transmitter
nor receiver inputs for 30 seconds, the charge pump and
transmitters powerdown, thereby reducing supply current to
1µA. The ICL32XXE automatically powers back up
whenever it detects a transition on one of these inputs. This
automatic powerdown feature provides additional system
power savings without changes to the existing operating
system.
Enhanced automatic powerdown operates when the
FORCEON input is low, and the FORCEOFF input is high.
Tying FORCEON high disables automatic powerdown, but
manual powerdown is always available via the overriding
FORCEOFF input. Table 2 summarizes the enhanced
automatic powerdown functionality.
Figure 7 illustrates the enhanced powerdown control logic.
Note that once the ICL32XXE enters powerdown (manually
or automatically), the 30 second timer remains timed out
(set), keeping the ICL32XXE powered down until FORCEON
transitions high, or until a transition occurs on a receiver or
transmitter input.
T_IN
EDGE
DETECT
R_IN
EDGE
DETECT
FORCEOFF
S
30s
TIMER
R
AUTOSHDN
FORCEON
FIGURE 7. ENHANCED AUTOMATIC POWERDOWN LOGIC
The INVALID output signal switches low to indicate that
invalid levels have persisted on all of the receiver inputs for
more than 30µs (see Figure 8), but this has no direct effect
on the state of the ICL32XXE (see the next sections for
methods of utilizing INVALID to power down the device).
INVALID switches high 1µs after detecting a valid RS-232
level on a receiver input. INVALID operates in all modes
(forced or automatic powerdown, or forced on), so it is also
useful for systems employing manual powerdown circuitry.
The time to recover from automatic powerdown mode is
typically 100µs.
Emulating Standard Automatic Powerdown
If enhanced automatic powerdown isn’t desired, the user can
implement the standard automatic powerdown feature
(mimics the function on the ICL3221E/23E/43E) by
connecting the INVALID output to the FORCEON and
FORCEOFF inputs, as shown in Figure 9. After 30µs of
invalid receiver levels, INVALID switches low and drives the
ICL32XXE into a forced powerdown condition. INVALID
switches high as soon as a receiver input senses a valid
RS-232 level, forcing the ICL32XXE to power on. See the
“INVALID DRIVING FORCEON AND FORCEOFF” section
of Table 2 for an operational summary. This operational
mode is perfect for handheld devices that communicate with
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ICL3224E.PDF ] | |
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