FN4805.21 March 1, 2006 Mouse Driveability The ICL324X have been specifically designed to power a serial mouse while operating from low " />
參數(shù)資料
型號： ICL3232IB-T
廠商： Intersil
文件頁數(shù)： 6/28頁
文件大?。?/td> 0K
描述： IC 2DRVR/2RCVR RS232 3V 16-SOIC
標(biāo)準(zhǔn)包裝： 1,000
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 2/2
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC
包裝： 帶卷 (TR)
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 VCC.
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
s/DIV)
T1
T2
2V/DIV
5V/DIV
VCC = +3.3V
FORCEOFF
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
C1 - C4 = 0.1
F
FIGURE 9. TRANSMITTER OUTPUT VOLTAGE vs LOAD
CURRENT (PER TRANSMITTER, i.e., DOUBLE
CURRENT AXIS FOR TOTAL VOUT+ CURRENT)
TRA
N
SMI
TTER
O
U
TPUT
VO
LT
AG
E
(V
)
LOAD CURRENT PER TRANSMITTER (mA)
024
68
10
-6
-4
-2
0
2
4
6
-5
-3
-1
1
3
5
1
3579
VOUT+
VOUT -
VCC
VOUT+
VOUT -
T1
T2
T3
VCC = 3.0V
ICL3241/43
FIGURE 10. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 11. LOOPBACK TEST AT 120kbps
FIGURE 12. LOOPBACK TEST AT 250kbps
ICL32XX
VCC
FORCEOFF
C1
C2
C4
C3
+
1000pF
V+
V-
5K
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1
F
VCC
EN
SHDN OR
T1IN
T1OUT
R1OUT
5
s/DIV
VCC = +3.3V
5V/DIV
C1 - C4 = 0.1
F
T1IN
T1OUT
R1OUT
2
s/DIV.
5V/DIV.
VCC = +3.3V
C1 - C4 = 0.1
F
ICL3221, ICL3222, ICL3223, ICL3232, ICL3241, ICL3243
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