ISL4241EIR-T Intersil, ISL4241EIR-T Datasheet - Page 11

• Manufacturer Part Number: ISL4241EIR-T
• Description: IC 3DRVR/5RCVR RS232 3V 32-QFN
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of ISL4241EIR-T

• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Operation Down to 2.7V
The ISL4241E, ISL4243E transmitter outputs meet RS-562
levels (±3.7V), at the full data rate, with V
RS-562 levels typically ensure inter operability with RS-232
devices.
High Data Rates
The ISL4241E, ISL4243E 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.
5V/DIV.
2V/DIV.
FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING
FIGURE 9. TRANSMITTER LOOPBACK TEST CIRCUIT
V
V
C
C
CC
CC
1
2
V
C1 to C4 = 0.1µF
+
+
CC
= +3.3V
POWER-DOWN
FORCEOFF
0.1µF
C1+
C1-
C2+
C2-
T
R
FORCEON
FORCEOFF or SHDN
IN
OUT
+
ISL4241E
ISL4243E
TIME (20µs/DIV)
V
11
CC
T
OUT
5k
R
V+
V-
IN
CC
as low as 2.7V.
ISL4241E, ISL4243E
T1
T2
+
+
C
C
1000pF
3
4
Interconnection with 3V and 5V Logic
The ISL4241E, ISL4243E directly interface with 5V CMOS
and TTL logic families. Nevertheless, with the ISL4241E,
ISL4243E at 3.3V, and the logic supply at 5V, AC, HC, and
CD4000 outputs can drive ISL4241E, ISL4243E inputs, but
ISL4241E, ISL4243E outputs do not reach the minimum V
for these logic families. See Table 3 for more information.
POWER-SUPPLY
5V/DIV.
5V/DIV
R1
R1
T1
T1
TABLE 3. LOGIC FAMILY COMPATIBILITY WITH VARIOUS
T1
T1
OUT
OUT
OUT
OUT
VOLTAGE
SYSTEM
IN
IN
3.3
(V)
5
V
C1 to C4 = 0.1 µF
V
C1 - C4 = 0.µF
FIGURE 10. LOOPBACK TEST AT 120kbps
FIGURE 11. LOOPBACK TEST AT 250kbps
CC
CC
SUPPLY VOLTAGES
= +3.3V
= +3.3V
VOLTAGE
SUPPLY
V
(V)
3.3
CC
5
Compatible with all CMOS
families.
Compatible with all TTL and
CMOS logic families.
2µs/DIV
5µs/DIV
COMPATIBILITY
June 10, 2010
FN8037.7
IH