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PDF ICL3245 Data sheet ( Hoja de datos )
| Número de pieza | ICL3245 | |
| Descripción | 1 Microamp/ +3V to +5.5V/ 1Mbps/ RS-232 Transceivers with Enhanced Automatic Powerdown | |
| Fabricantes | Intersil | |
| Logotipo |  |
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®
Data Sheet
ICL3225, ICL3245
July 2004
FN4878.6
1 Microamp, +3V to +5.5V, 1Mbps, RS-232
Transceivers with Enhanced Automatic
Powerdown
The Intersil ICL32XX 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. 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 ICL3245 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
ICL32XX 3V family.
Features
• ±15kV ESD Protected (Human Body Model)
• Manual and Enhanced Automatic Powerdown Features
• Drop in Replacements for MAX3225, MAX3245
• 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 (ICL3245)
• “Ready to Transmit” Indicator Output (ICL3225)
• 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
• Pb-free available
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
ICL3225
ICL3245
NO. OF NO. OF
Tx. Rx.
22
35
NO. OF
MONITOR Rx.
(ROUTB)
0
1
DATA
RATE
(kbps)
1000
1000
Rx. ENABLE
FUNCTION?
No
No
READY
OUTPUT?
Yes
No
MANUAL
POWER-
DOWN?
Yes
Yes
ENHANCED
AUTOMATIC
POWERDOWN
FUNCTION?
Yes
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. 2000, 2001, 2003, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ICL3225, ICL3245
Absolute Maximum Ratings
VCC 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
TIN, FORCEOFF, FORCEON. . . . . . . . . . . . . . . . . . . -0.3V to 6V
RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V
Output Voltages
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±13.2V
ROUT, INVALID, READY . . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (°C/W)
20 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . .
80
20 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
135
28 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . .
100
28 Ld TSSOP Package . . . . . . . . . . . . . . . . . . . . . .
125
Maximum Junction Temperature (Plastic Package) . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C
(SSOP, TSSOP - Lead Tips Only)
Operating Conditions
Temperature Range
ICL32XXC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
ICL32XXI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 85°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:
1. θJA 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: VCC = 3V to 5.5V, C1 - C4 = 0.1µF; Unless Otherwise Specified.
Typicals are at TA = 25°C
PARAMETER
TEST CONDITIONS
TEMP
(°C) MIN
TYP MAX UNITS
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
All RIN Open, FORCEON = GND, FORCEOFF = VCC
25 -
1.0 10 µA
Supply Current, Powerdown
FORCEOFF = GND
25 -
1.0 10 µA
Supply Current,
Automatic Powerdown Disabled
All Outputs Unloaded,
ICL3245, VCC = 3.0V
FORCEON = FORCEOFF = VCC ICL322X, VCC = 3.15V
LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS
25 -
25 -
0.3 1.0 mA
0.3 1.0 mA
Input Logic Threshold Low
Input Logic Threshold High
Transmitter Input Hysteresis
TIN, FORCEON, FORCEOFF
TIN, FORCEON, FORCEOFF
VCC = 3.3V
VCC = 5.0V
Full -
Full 2.0
Full 2.4
25 -
- 0.8 V
- -V
- -V
0.5 - V
Input Leakage Current
Output Leakage Current
TIN, FORCEON, FORCEOFF
FORCEOFF = GND
Full - ±0.01 ±1.0 µA
Full - ±0.05 ±10 µA
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
IOUT = 1.6mA
IOUT = -1.0mA
Full -
- 0.4
Full VCC -0.6 VCC -0.1 -
V
V
Input Voltage Range
Full -25
- 25 V
Input Threshold Low
Input Threshold High
Input Hysteresis
VCC = 3.3V
VCC = 5.0V
VCC = 3.3V
VCC = 5.0V
25 0.6
25 0.8
25 -
25 -
25 -
1.2 - V
1.5 - V
1.5 2.4 V
1.8 2.4 V
0.5 - V
Input Resistance
25 3
5 7 kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3kΩ to Ground
Full ±5.0
±5.4 -
V
Output Resistance
Output Short-Circuit Current
VCC = V+ = V- = 0V, Transmitter Output = ±2V
Full 300
Full -
10M - Ω
±35 ±60 mA
Output Leakage Current
VOUT = ±12V, VCC = 0V or 3V to 5.5V
Automatic Powerdown or FORCEOFF = GND
Full -
- ±25 µA
5
5 Page 
ICL3225, ICL3245
receiver and transmitter inputs. Detaching the cable allows
the receiver inputs to drop to an invalid level (GND), so
INVALID switches low and forces the RS-232 device to
power down. The ICL32XX remains powered down until the
cable is reconnected (INVALID = FORCEOFF = 1) and a
transition occurs on a receiver or transmitter input (see
Figure 7). For immediate power up when the cable is
reattached, connect FORCEON to FORCEOFF through a
network similar to that shown in Figure 5.
Ready Output (ICL3225 Only)
The Ready output indicates that the ICL322X is ready to
transmit. Ready switches low whenever the device enters
powerdown, and switches back high during power-up when
V- reaches -4V or lower.
Capacitor Selection
The charge pumps require 0.1µF capacitors for 3.3V
operation. For other supply voltages refer to Table 3 for
capacitor values. Do not use values smaller than those listed
in Table 3. Increasing the capacitor values (by a factor of 2)
reduces ripple on the transmitter outputs and slightly
reduces power consumption. C2, C3, and C4 can be
increased without increasing C1’s value, however, do not
increase C1 without also increasing C2, C3, and C4 to
maintain the proper ratios (C1 to the other capacitors).
When using minimum required capacitor values, make sure
that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal
value. The capacitor’s equivalent series resistance (ESR)
usually rises at low temperatures and it influences the
amount of ripple on V+ and V-.
TABLE 3. REQUIRED CAPACITOR VALUES
VCC (V)
3.0 to 3.6
C1 (µF)
0.1
C2, C3, C4 (µF)
0.1
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.1
0.47
Power Supply Decoupling
In most circumstances a 0.1µF bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC to ground with a
capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
Operation Down to 2.7V
ICL32XXE transmitter outputs meet RS-562 levels (±3.7V),
at full data rate, with VCC as low as 2.7V. RS-562 levels
typically ensure inter operability with RS-232 devices.
Transmitter Outputs when Exiting
Powerdown
Figure 10 shows the response of two transmitter outputs
when exiting powerdown mode. As they activate, the two
transmitter outputs properly go to opposite RS-232 levels,
with no glitching, ringing, nor undesirable transients. Each
transmitter is loaded with 3kΩ in parallel with 2500pF. Note
that the transmitters enable only when the magnitude of the
supplies exceed approximately 3V.
5V/DIV.
FORCEOFF
2V/DIV
T1
VCC = +3.3V
C1 - C4 = 0.1µF
T2
5V/DIV.
READY
TIME (20µs/DIV.)
FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
Mouse Driveability
The ICL3245 is specifically designed to power a serial mouse
while operating from low voltage supplies. Figure 11 shows the
transmitter output voltages under increasing load current. The
on-chip switching regulator ensures the transmitters will supply
at least ±5V during worst case conditions (15mA for paralleled
V+ transmitters, 7.3mA for single V- transmitter).
6
5
4
3 VCC = 3.0V
VOUT+
2
T1
1
0
-1 T2
-2
-3 VCC T3
VOUT+
ICL3245
VOUT -
-4 VOUT -
-5
-6
0 12 34 56 78 9
LOAD CURRENT PER TRANSMITTER (mA)
10
FIGURE 11. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL VOUT+ CURRENT)
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ICL3245.PDF ] | |
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