ISO35T_15 Datasheet, PDF (11/31 Pages) Texas Instruments – Isolated 3.3V RS-485 Transceiver With Integrated Transformer Driver

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ISO35T
SLLSE26D – NOVEMBER 2010 – REVISED OCTOBER 2015
Parameter Measurement Information (continued)
D S1
3V Y
0V Z
Input
Generator
VI
Y
S1
D
V_O
50 W
Z
DE
C _L = 50 pF _± 20 %
CL includes fixture and
instrumentation
capacitance
R_L = 110 W
±1%
GND1
Generator: PRR = 50 kHz, 50% duty
cycle, t_r <6ns, t_f <6ns, Z_O = 50 W
GND2
VI
t_pZH
VO
50%
50%
50%
t_pHZ
3V
90%
0V
VOH
»0V
Figure 16. Driver High-Level Output Enable and Disable Time Test Circuit and Voltage Waveforms
V_CC2
D S1
3V Y
0V Z ^D
Y
R_L = 110 W
S1
± 1%
VO
VI
Generator: PRR=50 kHz, 50% duty cycle,
Z
t _r< 6ns, t _f < 6ns, Z_O = 50 W
DE
C_L = 50 pF ± 20 %
Input
CL includes fixture and
V_O
Generator
V_I
50 W
instrumentation
capacitance
GND1
GND2
50%
50%
t_pZL
50%
t_pLZ
10%
3V
0V
V_CC2
V_OL
Figure 17. Driver Low-Level Output Enable and Disable Time Test Circuit and Voltage Waveform
V_{A +} V_B
2
I_A
A
V
A
V
ID
V_IC
B
V
B
I_B
R ^IO
V_O
Figure 18. Receiver Voltage and Current Definitions
A
Input
Generator
VI
50 W
R V_O
GND2
1.5 V ^B
RE
GND1
Generator : PRR=100 kHz, 50% duty cycle ,
t _r < 6 ns, t _f < 6 ns, ZO = 50 W
C_L= 15 pF
± 20%
CL includes fixture and
instrumentation capacitance
V_I
t_pLH
50%
V_O
50 %
t_r
t_pHL
Figure 19. Receiver Switching Test Circuit and Waveforms
3V
50%
0V
90 %
V_OH
50 %
10 %
t_f
V_OL
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