參數(shù)資料
型號： ICL3222
廠商： Intersil Corporation
英文描述： One Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers(1微安電源電流, +3V至+5.5V, 250kbps, RS-232收發(fā)器)
中文描述： 1微安電源電流，3V至5.5V，250kbps的和RS - 232發(fā)送器/接收器（1微安電源電流，采用3V至5.5V的，250kbps的，RS - 232接口收發(fā)器）
文件頁數(shù)： 14/28頁
文件大小： 657K
代理商： ICL3222
14
FN4805.21
March 1, 2006
Mouse Driveability
The ICL324X 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 ICL32XX 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 (20
μ
s/DIV)
T1
T2
2V/DIV
5V/DIV
V
CC
= +3.3V
C1 - C4 = 0.1
μ
F
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
ICL3241/43
FIGURE 10. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 11. LOOPBACK TEST AT 120kbps
FIGURE 12. LOOPBACK TEST AT 250kbps
ICL32XX
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
T1
IN
T1
OUT
R1
OUT
5
μ
s/DIV
V
CC
= +3.3V
C1 - C4 = 0.1
μ
F
5V/DIV
T1
IN
T1
OUT
R1
OUT
2
μ
s/DIV.
5V/DIV.
V
CC
= +3.3V
C1 - C4 = 0.1
μ
F
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
相關PDF資料
PDF描述
ICL3223 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
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ICL3241 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
ICL3243 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
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