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ISL4221EIR Arkusz danych(PDF) 9 Page - Intersil Corporation

Numer części ISL4221EIR
Szczegółowy opis  QFN Packaged, /-15kV ESD Protected, 2.7V to 5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/Receivers
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL4221EIR Arkusz danych(HTML) 9 Page - Intersil Corporation

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9
Note that the transmitters enable only when the magnitude
of the supplies exceed approximately 3V.
Operation Down to 2.7V
ISL422XE 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 ISL422XE 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.
Interconnection with 3V and 5V Logic
The ISL422XE directly interface with 5V CMOS and TTL
logic families. Nevertheless, with the ISL422XE at 3.3V, and
the logic supply at 5V, AC, HC, and CD4000 outputs can
drive ISL422XE inputs, but ISL422XE outputs do not reach
the minimum VIH for these logic families. See Table 3 for
more information.
FIGURE 9. TRANSMITTER LOOPBACK TEST CIRCUIT
TIME (20
µs/DIV.)
T1
T2
2V/DIV.
5V/DIV.
VCC = +3.3V
FORCEOFF
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
C1 - C4 = 0.1
µF
ISL422XE
VCC
FORCEOFF
C1
C2
C4
C3
+
+
+
+
1000pF
V+
V-
5k
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1
µF
VCC
FORCEON
FIGURE 10. LOOPBACK TEST AT 120kBps
FIGURE 11. LOOPBACK TEST AT 250kBps
TABLE 3. LOGIC FAMILY COMPATIBILITY WITH VARIOUS
SUPPLY VOLTAGES
SYSTEM
POWER-SUPPLY
VOLTAGE
(V)
VCC
SUPPLY
VOLTAGE
(V)
COMPATIBILITY
3.3
3.3
Compatible with all CMOS
families.
5
5
Compatible with all TTL and
CMOS logic families.
5
3.3
Compatible with ACT and HCT
CMOS, and with TTL. ISL422XE
outputs are incompatible with AC,
HC, and CD4000 CMOS inputs.
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
ISL4221E, ISL4223E


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