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ISL83220E Datasheet(PDF) 6 Page - Intersil Corporation

Part No. ISL83220E
Description  /-15kV ESD Protected, 3V to 5.5V, 1Microamp, 250kbps, RS-232 Transmitters/Receivers
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL83220E Datasheet(HTML) 6 Page - Intersil Corporation

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6
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 Output when Exiting
Powerdown
Figure 3 shows the response of the transmitter output when
exiting powerdown mode. As it activates, the transmitter
output properly goes to RS-232 levels, with no glitching,
ringing, nor undesirable transients. The transmitter is loaded
with 3k
Ω in parallel with 2500pF. Note that the transmitter
enables only when the magnitude of the supplies exceed
approximately 3V.
High Data Rates
The ISL83220E 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,
the transmitter is driving an RS-232 load in parallel with
1000pF, at 120kbps. Figure 6 shows the loopback results for
the transmitter driving 1000pF and an RS-232 load at
250kbps.
TIME (20
µs/DIV.)
2V/DIV.
5V/DIV.
VCC = +3.3V
SHDN
FIGURE 3. TRANSMITTER OUTPUT WHEN EXITING
POWERDOWN
C1 - C4 = 0.1
µF
TIN = LOW
TIN = HIGH
FIGURE 4. TRANSMITTER LOOPBACK TEST CIRCUIT
FIGURE 5. LOOPBACK TEST AT 120kbps
FIGURE 6. LOOPBACK TEST AT 250kbps
ISL83220E
VCC
C1
C2
C4
C3
+
+
+
+
1000pF
V+
V-
5k
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1
µF
VCC
EN
SHDN
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
ISL83220E


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