ICL3207_05 Datasheet, PDF (8/11 Pages) Intersil Corporation – Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers

ICL3207, ICL3217
High Data Rates
The ICL32XX maintain the RS-232 ±5V minimum transmitter
output voltages even at high data rates. Figure 7 details a
transmitter loopback test circuit, and Figure 8 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 9 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.
V_CC
0.1µF
+
+
C₁
+
C₂
C1+
V_CC
V+
C1-
ICL32X7
C2+
V-
C2-
T_IN
T_OUT
R_OUT
R_IN
5k
+
C₃
+C⁴
1000pF
FIGURE 7. TRANSMITTER LOOPBACK TEST CIRCUIT
5V/DIV.
T1_IN
T1_OUT
5V/DIV.
T1_IN
T1_OUT
R1_OUT
V_CC = +3.3V
C1 - C4 = 0.1µF
2µs/DIV.
FIGURE 9. LOOPBACK TEST AT 250kbps
Interconnection with 3V and 5V Logic
The ICL32X7 directly interface with most 5V logic families,
including ACT and HCT CMOS. See Table 4 for more
information on possible combinations of interconnections.
TABLE 4. LOGIC FAMILY COMPATIBILITY WITH VARIOUS
SUPPLY VOLTAGES
SYSTEM
POWER-SUPPLY
VOLTAGE
(V)
V_CC
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.
Incompatible with AC, HC, or
CD4000 CMOS.
R1_OUT
V_CC = +3.3V
C1 - C4 = 0.1µF
5µs/DIV.
FIGURE 8. LOOPBACK TEST AT 120kbps
8