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ICL3207E Datasheet(PDF) 8 Page - Intersil Corporation |
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ICL3207E Datasheet(HTML) 8 Page - Intersil Corporation |
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8 Operation down to 2.7V ICL32X7E transmitter outputs meet RS-562 levels (±3.7V) with VCC as low as 2.7V. RS-562 levels typically ensure inter operability with RS-232 devices. 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. Interconnection with 3V and 5V Logic The ICL32X7E directly interface with 5V CMOS and TTL logic families. Nevertheless, with the ICL32X7E at 3.3V, and the logic supply at 5V, AC, HC, and CD4000 outputs can drive ICL32X7E inputs, but ICL32X7E outputs do not reach the minimum VIH for these logic families. See Table 4 for more information. ±15kV ESD Protection All pins on ICL32XX devices include ESD protection structures, but the ICL32X7E incorporate advanced structures which allow the RS-232 pins (transmitter outputs and receiver inputs) to survive ESD events up to ±15kV. The RS-232 pins are particularly vulnerable to ESD damage because they typically connect to an exposed port on the exterior of the finished product. Simply touching the port pins, or connecting a cable, can cause an ESD event that might destroy unprotected ICs. These new ESD structures protect the device whether or not it is powered up, protect without allowing any latchup mechanism to activate, and don’t interfere with RS-232 signals as large as ±25V. FIGURE 7. TRANSMITTER LOOPBACK TEST CIRCUIT FIGURE 8. LOOPBACK TEST AT 120kbps ICL32X7E C1 C2 C4 C3 + + + + 1000pF V+ V- 5k TIN ROUT C1+ C1- C2+ C2- RIN TOUT + VCC 0.1 µF VCC T1IN T1OUT R1OUT 5 µs/DIV. VCC = +3.3V 5V/DIV. C1 - C4 = 0.1 µF FIGURE 9. LOOPBACK TEST AT 250kbps 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. ICL32X7 E outputs are incompatible with AC, HC, and CD4000 CMOS inputs. T1IN T1OUT R1OUT 2 µs/DIV. 5V/DIV. VCC = +3.3V C1 - C4 = 0.1mF ICL3207E, ICL3217E |
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