ISL3332_14 Datasheet, PDF (23/26 Pages) Intersil Corporation – 3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers

ISL3332, ISL3333
Typical Performance Curves V_CC = V_L = 3.3V, T_A = +25°C; Unless Otherwise Specified (Continued)
D_Y
5
0
R_DIFF = 54Ω, C_L = 100pF
5
0
R_A
D_Y
5
0
R_DIFF = 54Ω, C_L = 100pF
5
0
R_A
4
Y
3
2
Z
1
0
TIME (10ns/DIV)
FIGURE 32. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (FAST DATA RATE)
7.5
5.0 V_OUT+
250kbps
2.5
ALL T_OUTS LOADED WITH 3kΩ TO GND
0
2 TRANSMITTERS AT 250kbps or 400kbps,
OTHER TRANSMITTERS AT 30kbps
-2.5
400kbps
400kbps
-5
V_OUT -
-7.5
0
1000
2000
3000
250kbps
4000
5000
LOAD CAPACITANCE (pF)
FIGURE 34. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
LOAD CAPACITANCE
50
40
Y or Z = LOW
30
20
V_OUT SHORTED TO GND
10
0
-10
Y or Z = HIGH
-20
-30_{-40 -25}
0
25
50
TEMPERATURE (°C)
75 85
FIGURE 36. RS-232, TRANSMITTER SHORT CIRCUIT
CURRENT vs TEMPERATURE
4
Z
3
2
Y
1
0
TIME (10ns/DIV)
FIGURE 33. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (FAST DATA RATE)
7.5
5.0
V_OUT+
2.5
OUTPUTS STATIC
ALL T_OUTS LOADED WITH 3kΩ TO GND
0 _{AND AT V+ OR V-}
-2.5
-5
-7.5
-40 -25
V_OUT -
0
25
50
TEMPERATURE (°C)
75 85
FIGURE 35. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
TEMPERATURE
C_L = 2000pF, 2 CHANNELS SWITCHING
5
DY
0
5
0
Y/A
-5
5
RA
0
2µs/DIV.
FIGURE 37. RS-232, TRANSMITTER AND RECEIVER
WAVEFORMS AT 250kbps
23
FN6362.0
May 27, 2008