ISL33354E Datasheet, PDF (14/23 Pages) Intersil Corporation – Full fail-safe (open/short) RS-485/422 port 2 Rx

ISL33354E, ISL33357E
Typical Performance Curves V_CC = 5V, T_A = +25°C, unless otherwise specified (Continued)
DI
5
0
R_DIFF = 60Ω, C_L = 100pF
5
0
RO
DI
5
0
R_DIFF = 60Ω, C_L = 100pF
5
0
RO
5
4Z
3
2Y
1
0
TIME (10ns/DIV)
FIGURE 20. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (FAST DATA RATE)
5
4
Y
3
2
1Z
0
TIME (200ns/DIV)
FIGURE 21. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (FAST DATA RATE)
7.5
5.0 V_OUT+
250kbps
2.5
BOTH T_OUTS LOADED WITH 3kΩ TO GND
0
2 TRANSMITTERS AT 250kbps OR 500kbps
-2.5
500kbps
-5.0
V_OUT -
-7.5 ₀
1000
2000
3000
500kbps
250kbps
4000
5000
LOAD CAPACITANCE (pF)
FIGURE 22. RS-232, TRANSMITTER OUTPUT VOLTAGE vs LOAD
CAPACITANCE
7.5
5.0
2.5
OUTPUTS STATIC
BOTH T_OUTS LOADED WITH 3kΩ TO GND
0
V_OUT+
-2.5
-5.0
V_OUT -
-7.5
-40 -25
0
25
50
TEMPERATURE (°C)
75 85
FIGURE 23. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
TEMPERATURE
40
30
Y or Z = LOW
20
10
V_OUT SHORTED TO GND
0
-10
-20
Y or Z = HIGH
-30
-40
-40 -25
0
25
50
TEMPERATURE (°C)
75 85
FIGURE 24. RS-232, TRANSMITTER SHORT-CIRCUIT CURRENT vs
TEMPERATURE
C_L = 3500pF, 2 CHANNELS SWITCHING
5V
TxIN
0
5V
TxOUT/RxIN
0
-5V
5V
RxOUT
0
2µs/DIV
FIGURE 25. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS AT
250kbps
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FN8775.1
October 21, 2016