ICL3237 Просмотр технического описания (PDF) - Intersil
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ICL3237 Datasheet PDF : 11 Pages
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ICL3237
details a transmitter loopback test circuit, and Figure 6
illustrates the standard speed loopback test result for a
single transmitter driving 1000pF and an RS-232 load at
250kbps. Figure 7 shows the megabaud 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.
SHDN
T1
2V/DIV.
T2
VCC = +3.3V
C1 - C4 = 0.1µF
TIME (20µs/DIV.)
FIGURE 4. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
VCC
0.1µF
+
+
C1
+
C2
VCC
C1+
VCC
V+
C1-
ICL3237
C2+
V-
C2-
TIN
TOUT
ROUT
RIN
EN
5K
SHDN
MBAUD
+
C3
+C4
CL
GND or VCC
FIGURE 5. TRANSMITTER LOOPBACK TEST CIRCUIT
5V/DIV. MBAUD = GND
T1IN
T1OUT
R1OUT
VCC = +3.3V
C1 - C4 = 0.1µF
2µs/DIV.
FIGURE 6. LOOPBACK TEST AT 250kbps (CL = 1000pF)
5V/DIV. MBAUD = VCC
T1IN
T1OUT
R1OUT
VCC = +3.3V
C1 - C4 = 0.1µF
0.5µs/DIV.
FIGURE 7. LOOPBACK TEST AT 1Mbps (CL = 250pF)
Interconnection with 3V and 5V Logic
The ICL3237 directly interfaces 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)
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.
Incompatible with AC, HC, or
CD4000 CMOS.
8
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