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參數(shù)資料
| 型號(hào)： | ICL3243ECBZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | TRIPLE LINE TRANSCEIVER, PDSO28 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS-013AE, SOIC-28 |
| 文件頁數(shù)： | 14/27頁 |
| 文件大?。?/td> | 860K |
| 代理商： | ICL3243ECBZ-T |
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14
FN4910.18
March 8, 2005
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 ICL3241E and ICL3243E have been specifically
designed to power a serial mouse while operating from low
voltage supplies. Figure 9 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). The
Automatic Powerdown feature does not work with a mouse,
so FORCEOFF and FORCEON should be connected to V
CC
.
High Data Rates
The ICL32XXE maintain the RS-232
±
5V minimum
transmitter output voltages even at high data rates.
Figure 10 details a transmitter loopback test circuit, and
Figure 11 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 12 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 (20μs/DIV)
T1
T2
2V/DIV
5V/DIV
V
CC
= +3.3V
C1 - C4 = 0.1μF
FORCEOFF
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
FIGURE 9. 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
ICL3241E, ICL3243E
FIGURE 10. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 11. LOOPBACK TEST AT 120kbps
FIGURE 12. LOOPBACK TEST AT 250kbps
ICL32XXE
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
0.1μF
V
CC
EN
SHDN OR
T1
IN
T1
OUT
R1
OUT
5μs/DIV
V
CC
= +3.3V
C1 - C4 = 0.1μF
5V/DIV
T1
IN
T1
OUT
R1
OUT
2μs/DIV
5V/DIV
V
= +3.3V
C1 - C4 = 0.1μF
ICL3221E, ICL3222E, ICL3223E, ICL3232E, ICL3241E, ICL3243E
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