isl8485e Intersil Corporation, isl8485e Datasheet - Page 7

• Manufacturer Part Number: isl8485e
• Description: 5v, Half Duplex, 5mbps, ?15kv Esd Protected, Rs-485/rs-422 Transceiver
• Manufacturer: Intersil Corporation

Test Circuits and Waveforms
(SHDN) FOR ISL8483E ONLY
SIGNAL
GENERATOR
PARAMETER OUTPUT
t
t
ZH(SHDN)
ZL(SHDN)
SIGNAL
GENERATOR
t
t
t
t
HZ
ZH
LZ
ZL
V
CC
DE
DI
FIGURE 2A. TEST CIRCUIT
FIGURE 3A. TEST CIRCUIT
DE
DI
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
D
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
0 (Note 5)
0 (Note 5)
1 (Note 8)
1 (Note 8)
D
Y
Z
RE
X
X
7
Z
Y
C
L
R
1 / 0
0 / 1
1 / 0
0 / 1
1 / 0
0 / 1
DI
DIFF
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
(Continued)
500Ω
GND
GND
GND
V
V
V
SW
C
C
CC
CC
CC
L
L
= 100pF
SW
= 100pF
ISL8483E, ISL8485E
C
L
100
100
100
100
GND
V
15
15
(pF)
CC
SKEW = |t
DIFF OUT (Y - Z)
OUT (Y, Z)
OUT (Y, Z)
OUT (Y)
OUT (Z)
t
t
ZH
ZL
NOTE 7
NOTE 7
DI
DE
, t
, t
ZH(SHDN)
ZL(SHDN)
PLH
NOTE 7
FIGURE 2B. MEASUREMENT POINTS
FIGURE 3B. MEASUREMENT POINTS
(Y or Z) - t
t
10%
R
90%
t
t
1.5V
PLH
PHL
PHL
1.5V
(Z or Y)|
OUTPUT HIGH
50%
50%
2.3V
2.3V
OUTPUT LOW
t
t
PHL
PLH
t
1.5V
t
HZ
LZ
1.5V
90%
V
50%
V
50%
OH
OL
10%
t
+ 0.5V
- 0.5V
F
3V
0V
3V
0V
+V
-V
V
V
V
V
V
V
V
OH
OL
OH
OL
0V
OD
OD
OH
CC
OL