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ISL83386EIV-T Datasheet(PDF) 7 Page - Intersil Corporation

Part # ISL83386EIV-T
Description  짹15kV ESD Protected, 3V to 5.5V, 1 Microamp, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL83386EIV-T Datasheet(HTML) 7 Page - Intersil Corporation

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7
FN6034.1
November 19, 2004
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 ISL83386E 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.
TIME (20
µs/DIV.)
T1
2V/DIV
5V/DIV
VCC = +3.3V
SHDN
FIGURE 3. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
C1 - C4 = 0.1
µF
T2
FIGURE 4. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 5. LOOPBACK TEST AT 120kbps
FIGURE 6. LOOPBACK TEST AT 250kbps
ISL83386E
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
ISL83386E


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