參數(shù)資料
型號(hào)： ISL4260EIR-T
廠商： Intersil
文件頁(yè)數(shù)： 9/11頁(yè)
文件大小： 0K
描述： IC 3DRVR/2RCVR RS232 3V 32-QFN
標(biāo)準(zhǔn)包裝： 6,000
類(lèi)型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 3/2
規(guī)程： RS232
電源電壓： 3 V ~ 5.5 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 32-QFN 裸露焊盤(pán)（5x5）
包裝： 帶卷 (TR)
7
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
μF bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC to ground with a
capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
Transmitter Outputs when Exiting
Powerdown
Figure 3 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
Ω in parallel with 2500pF. Note
that the transmitters enable only when the magnitude of the
supplies exceed approximately 3V.
High Data Rates
The ISL4260E maintains the RS-232 ±5V minimum
transmitter output voltages even at high data rates. Figure 4
details a transmitter loopback test circuit, and Figure 5
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 6 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.
TABLE 3. REQUIRED CAPACITOR VALUES
VCC
(V)
C1
(
μF)
C2, C3, C4
(
μF)
3.0 to 3.6
0.1
4.5 to 5.5
0.047
0.33
3.0 to 5.5
0.22
1
FIGURE 3. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
TIME (20
μs/DIV.)
T1
2V/DIV
5V/DIV
VCC = +3.3V
SHDN
C1 - C4 = 0.1
μF
T2
FIGURE 4. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 5. LOOPBACK TEST AT 120kbps
FIGURE 6. LOOPBACK TEST AT 250kbps
ISL4260E
VCC
C1
C2
C4
C3
+
1000pF
V+
V-
5k
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1
μF
VCC
SHDN
VL
T1IN
T1OUT
R1OUT
5
μs/DIV.
VCC = +3.3V
5V/DIV.
C1 - C4 = 0.1
μF
T1IN
T1OUT
R1OUT
2
μs/DIV.
5V/DIV.
VCC = +3.3V
C1 - C4 = 0.1
μF
ISL4260E
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