전자부품 데이터시트 검색엔진 |
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ISL4243EIRZ 데이터시트(PDF) 11 Page - Intersil Corporation |
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ISL4243EIRZ 데이터시트(HTML) 11 Page - Intersil Corporation |
11 / 14 page 11 FN8037.7 June 10, 2010 Operation Down to 2.7V The ISL4241E, ISL4243E transmitter outputs meet RS-562 levels (±3.7V), at the full data rate, with VCC as low as 2.7V. 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. 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 VIH for these logic families. See Table 3 for more information. FIGURE 9. TRANSMITTER LOOPBACK TEST CIRCUIT TIME (20µs/DIV) T1 T2 2V/DIV. 5V/DIV. VCC = +3.3V FORCEOFF FIGURE 8. TRANSMITTER OUTPUTS WHEN EXITING POWER-DOWN C1 to C4 = 0.1µF ISL4241E VCC FORCEOFF or SHDN C1 C2 C4 C3 + + + + 1000pF V+ V- 5k TIN ROUT C1+ C1- C2+ C2- RIN TOUT + VCC 0.1µF VCC FORCEON ISL4243E FIGURE 10. LOOPBACK TEST AT 120kbps FIGURE 11. LOOPBACK TEST AT 250kbps TABLE 3. 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. T1IN T1OUT R1OUT 5µs/DIV VCC = +3.3V 5V/DIV C1 to C4 = 0.1 µF T1IN T1OUT R1OUT 2µs/DIV 5V/DIV. VCC = +3.3V C1 - C4 = 0.µF ISL4241E, ISL4243E |
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