ICL3245 Intersil Corporation, ICL3245 Datasheet - Page 12

• Manufacturer Part Number: ICL3245
• Description: 1ma, +3v To +5.5v, 1mbps, Rs-232 Transceivers With Enhanced Automatic Powerdown
• Manufacturer: Intersil Corporation

High Data Rates
The ICL32XX maintain the RS-232
output voltages even at high data rates. Figure 12 details a
transmitter loopback test circuit, and Figure 13 illustrates the
loopback test result at 250kbps. For this test, all transmitters
were simultaneously driving RS-232 loads in parallel with
1000pF, at 250kbps. Figure 14 shows the loopback results
for a single transmitter driving 250pF and an RS-232 load at
1Mbps. The static transmitters were also loaded with an
RS-232 receiver.
5V/DIV.
R1
T1
FIGURE 13. LOOPBACK TEST AT 250kbps (C
T1
FIGURE 12. TRANSMITTER LOOPBACK TEST CIRCUIT
OUT
OUT
IN
V
V
C
C
CC
CC
1
2
V
C1 - C4 = 0.1µF
+
+
CC
= +3.3V
0.1µF
C1+
C1-
C2+
C2-
T
R
FORCEON
FORCEOFF
IN
OUT
+
ICL32XX
V
12
CC
2µs/DIV.
T
±
OUT
5V minimum transmitter
R
V+
5K
V-
IN
L
= 1000pF)
+
+
C
C
C
ICL3225, ICL3245
3
4
L
Interconnection with 3V and 5V Logic
The ICL32XXE directly interfaces with 5V CMOS and TTL
logic families. Nevertheless, with the ICL32XX at 3.3V, and
the logic supply at 5V, AC, HC, and CD4000 outputs can
drive ICL32XX inputs, but ICL32XX outputs do not reach the
minimum V
information.
POWER-SUPPLY
5V/DIV.
R1
T1
TABLE 4. LOGIC FAMILY COMPATIBILITY WITH VARIOUS
T1
OUT
OUT
VOLTAGE
FIGURE 14. LOOPBACK TEST AT 1Mbps (C
SYSTEM
IN
3.3
(V)
5
5
V
C1 - C4 = 0.1µF
CC
IH
SUPPLY VOLTAGES
= +3.3V
for these logic families. See Table 4 for more
VOLTAGE
SUPPLY
V
(V)
3.3
3.3
CC
5
0.5µs/DIV.
Compatible with all CMOS
families.
Compatible with all TTL and
CMOS logic families.
Compatible with ACT and HCT
CMOS, and with TTL. ICL32XX
outputs are incompatible with AC,
HC, and CD4000 CMOS inputs.
COMPATIBILITY
L
February 27, 2006
= 250pF)
FN4878.8