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ISL4223EIR データシート(PDF) 10 Page - Intersil Corporation

部品番号 ISL4223EIR
部品情報  QFN Packaged, 짹15kV ESD Protected, 2.7V to 5.5V, 150nA, 250kbps, RS-232 2.7V to 5.5V, 150nA, 250kbps, RS-232
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メーカー  INTERSIL [Intersil Corporation]
ホームページ  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL4223EIR データシート(HTML) 10 Page - Intersil Corporation

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10
FN6045.3
February 13, 2008
Power Supply Decoupling
In most circumstances a 0.1µF 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
Power-down
Figure 8 shows the response of two transmitter outputs
when exiting power-down 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.
Operation Down to 2.7V
ISL4221E, ISL4223E and ISL3232E transmitter outputs
meet RS-562 levels (±3.7V), at the full data rate, with VCC
as low as 2.7V. RS-562 levels typically ensure inter
operability with RS-232 devices.
High Data Rates
The ISL4221E, ISL4223E and ISL3232E maintain the RS-
232 ±5V minimum transmitter output voltages even at high
data rates. Figure 9 details a transmitter loopback test
circuit, and Figure 10 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 11 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
VCC = +3.3V
FORCEOFF
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
POWER-DOWN
C1 - C4 = 0.1µF
FIGURE 9. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 10. LOOPBACK TEST AT 120kbps
FIGURE 11. LOOPBACK TEST AT 250kbps
ISL4221E, ISL4223E
VCC
FORCEOFF
C1
C2
C4
C3
+
+
+
+
1000pF
V+
V-
5k
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1µF
VCC
FORCEON
T1IN
T1OUT
R1OUT
TIME (5µs/DIV)
VCC = +3.3V
5V/DIV
C1 - C4 = 0.1µF
T1IN
T1OUT
R1OUT
TIME (2µs/DIV)
5V/DIV
VCC = +3.3V
C1 - C4 = 0.1µF
ISL3232E, ISL4221E, ISL4223E


同様の部品番号 - ISL4223EIR

メーカー部品番号データシート部品情報
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