參數(shù)資料
型號(hào)： ICL3245EIAZ
廠商： INTERSIL CORP
元件分類： 通用總線功能
英文描述： 【15kV ESD Protected, +3V to +5.5V, 1Microamp, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown
中文描述： TRIPLE LINE TRANSCEIVER, PDSO28
封裝： ROHS COMPLIANT, PLASTIC, MO-150AH, SSOP-28
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 450K
代理商： ICL3245EIAZ
12
FN4900.9
February 27, 2006
Ready Output (ICL3225E and ICL3227E Only)
The Ready output indicates that the ICL322XE 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 0.1
μ
F 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. C
2
, C
3
, and C
4
can be
increased without increasing C
1
’s value, however, do not
increase C
1
without also increasing C
2
, C
3
, and C
4
to
maintain the proper ratios (C
1
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-.
Power Supply Decoupling
In most circumstances a 0.1
μ
F bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple V
CC
to ground with a
capacitor of the same value as the charge-pump capacitor C
1
.
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 V
CC
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 3k
in parallel with 2500pF. Note
that the transmitters enable only when the magnitude of the
supplies exceed approximately 3V.
Mouse Driveability
The ICL3245E 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).
High Data Rates
The ICL32XXE maintain the RS-232
±
5V minimum
transmitter output voltages even at high data rates. Figure
12 details a transmitter loopback test circuit, and Figure 13
illustrates the loopback test result at 250kbps. For this test,
all transmitters were simultaneously driving RS-232 loads in
parallel with 1000pF, at 250kbps. Figure 14 shows the
loopback results for a single transmitter driving 250pF and
TABLE 3. REQUIRED CAPACITOR VALUES
V
CC
(V)
C
1
(
μ
F)
C
2
, C
3
, C
4
(
μ
F)
3.0 to 3.6
0.1
0.1
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.1
0.47
TIME (20
μ
s/DIV.)
T1
T2
2V/DIV
5V/DIV
V
CC
= +3.3V
C1 - C4 = 0.1
μ
F
FORCEOFF
FIGURE 10. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
5V/DIV
READY
FIGURE 11. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL V
OUT
+ CURRENT)
T
LOAD CURRENT PER TRANSMITTER (mA)
0
2
4
6
8
10
-6
-4
-2
0
2
4
6
-5
-3
-1
1
3
5
1
3
5
7
9
V
OUT
+
V
OUT
-
V
CC
V
OUT
+
V
OUT
-
T1
T2
T3
V
CC
= 3.0V
ICL3245E
ICL3225E, ICL3227E, ICL3245E
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ICL3245EIV 制造商:Rochester Electronics LLC 功能描述:RS232 3V 3D/5R 15KV 1MBPS E-DWN 28TSSOP IND - Bulk
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