ISL43485 Datasheet, PDF (9/11 Pages) Intersil Corporation – 3.3V, Low Power, 30Mbps, RS-485/RS-422

ISL43485
Typical Performance Curves V_CC = 3.3V, T_A = 25°C; Unless Otherwise Specified
DI = 30Mbps
5
0
RO
DI = 20Mbps
5
5
0
0
5
RO
0
DRIVER+CABLE DELAY (~290ns)
3
1.5
A-B
0
-1.5
-3
TIME (20ns/DIV)
FIGURE 6. DRIVER AND RECEIVER WAVEFORMS DRIVING
200 FEET OF CAT5 CABLE (DOUBLE
TERMINATED WITH 120Ω)
DRIVER+CABLE DELAY (~425ns)
3
1.5
A-B
0
-1.5
-3
TIME (20ns/DIV)
FIGURE 7. DRIVER AND RECEIVER WAVEFORMS DRIVING
300 FEET OF CAT5 CABLE (DOUBLE
TERMINATED WITH 120Ω)
110
100
90
80
70
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
FIGURE 8. DRIVER OUTPUT CURRENT vs DIFFERENTIAL
OUTPUT VOLTAGE
160
140
120
100
80
60
40
20
0
-20
-40
-60
-80
-100
-120
-7 -6
Y OR Z = LOW
Y OR Z = HIGH
-4 -2
0
2
4
6
8
OUTPUT VOLTAGE (V)
10 12
FIGURE 10. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT
VOLTAGE
2.9
2.8
R_DIFF = 100Ω
2.7
2.6
2.5
2.4
2.3
R_DIFF = 54Ω
2.2
2.1
2
-40 -25
0
25
50
75 85
TEMPERATURE (°C)
FIGURE 9. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
800
ISL83483/85, DE = V_CC, RE = X
750
700
ISL83483/85, DE = RE = GND; ISL83491, DE = X, RE = GND;
ISL83488/90
650
600
-40 -25
0
25
50
TEMPERATURE (°C)
75 85
FIGURE 11. SUPPLY CURRENT vs TEMPERATURE
9