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參數(shù)資料
| 型號： | ICL3244CA |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 1Microamp, +3V to +5.5V, 250kbps, RS-232 Transceiver with Enhanced Automatic Powerdown |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | PLASTIC, MO-150AH, SSOP-28 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 141K |
| 代理商： | ICL3244CA |
4-9
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.
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 ICL3244 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 ICL3244 maintains 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 120kbps. For this test,
all transmitters were simultaneously driving RS-232 loads in
parallel with 1000pF, at 120kbps. Figure 14 shows the
loopback results for a single transmitter driving 1000pF and
an RS-232 load at 250kbps. The static transmitters were
also loaded with an RS-232 receiver.
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
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
ICL3244
ICL3244
V
CC
FORCEOFF
C
1
C
2
C
4
+
C
3
+
+
+
1000pF
V+
V-
5k
T
IN
R
OUT
C1+
C1-
C2+
C2-
R
IN
T
OUT
+
V
CC
0.1
μ
F
V
CC
EN
SHDN OR
FIGURE 12. TRANSMITTER LOOPBACK TEST CIRCUIT
ICL3244
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