7

Interconnection with 3V and 5V Logic

The ISL8563 directly interface with most 5V logic families,

including ACT and HCT CMOS. See Table 3 for more

information on possible combinations of interconnections.

FIGURE 8. LOOPBACK TEST AT 120kbps

FIGURE 9. LOOPBACK TEST AT 250kbps

5

µs/DIV.

5V/DIV.

C1 - C4 = 0.1

µF

2

µs/DIV.

5V/DIV.

C1 - C4 = 0.1

µF

TABLE 3. LOGIC FAMILY COMPATIBILITY WITH VARIOUS

SUPPLY VOLTAGES

SYSTEM

POWER-SUPPLY

VOLTAGE

(V)

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.

FIGURE 10. TRANSMITTER OUTPUT VOLTAGE vs LOAD

CAPACITANCE

FIGURE 11. SLEW RATE vs LOAD CAPACITANCE

-6

-4

-2

0

2

4

6

1000

2000

3000

4000

5000

0

LOAD CAPACITANCE (pF)

1 TRANSMITTER AT 250kbps

1 TRANSMITTER AT 30kbps

LOAD CAPACITANCE (pF)

0

1000

2000

3000

4000

5000

5

10

15

20

25

+SLEW

-SLEW

ISL8563