ISOLATED 5-V FULL & HALF-DUPLEX RS-485 TRANSCEIVERS ...

ISO3080, ISO3086
ISO3082, ISO3088
SLOS581A–MAY 2008–REVISED JUNE 2008 ............................................................................................................................................................... www.ti.com
PARAMETER MEASUREMENT INFORMATION (continued)
3V
0 V if testing A output ,
3 V if testing B output
D
3 V or0 V
Input
Generator
VI
50
DE
A
B
S1
C L = 50 pF ±20%
CL includes fixture and
instrumentation
capacitance
GND 2
R L = 110
±1%
VI
VO
50% 50%
t PZL t PLZ
50%
10%
3V
0 V
5V
VOL
Generator:PRR=50kHz,50% duty cycle,
t r < 6ns, t < 6ns, Z = 50
f
Figure 6. Driver Low-Level Output Enable and Disable Time Test Circuit and Voltage Waveform
IA
A
V A+
2
VB
V IC
V B
V A
V ID
I B
B
R
IO
VO
Figure 7. Receiver Voltage and Current Definitions
Input
Generator
V I
50
1.5 V
Generator: PRR=100 kHz, 50% duty cycle,
t
r < 6ns, t f < 6ns, Z O = 50
A
B
RE
R VO
C L = 15 pF
±20%
C includes fixture and
L
instrumentation capacitance
V I
V O
50% 50%
t t PLH PHL
90%
50% 50%
10%
t r
t f
3 V
0 V
V OH
V OL
Figure 8. Receiver Switching Test Circuit and Waveforms
1.5 V
0 V
Input
Generator
V CC
A
R VO
1 k ±1%
S1
B
C
RE L = 15 pF±20%
CL
includes fixture
and instrumentation
capacitance
VI 50
Generator:PRR=100 kHz, 50%duty cycle ,
t r