adm485arm-reel7 Analog Devices, Inc., adm485arm-reel7 Datasheet - Page 5

• Manufacturer Part Number: adm485arm-reel7
• Description: 5 V Low Power Eia Rs-485 Transceiver
• Manufacturer: Analog Devices, Inc.

Test Circuits
Switching Characteristics
REV. E
–V
3V
0V
V
0V
Figure 1. Driver Propagation Delay, Rise/Fall Timing
B
A
O
O
V
A, B
A, B
O
DE
10% POINT
Test Circuit 1. Driver Voltage Measurement
Test Circuit 2. Driver Voltage Measurement
1/2VO
Test Circuit 3. Driver Propagation Delay
Figure 2. Driver Enable/Disable Timing
90% POINT
1.5V
t
t
t
PLH
ZH
1.5V
ZL
t
R
2.3V
2.3V
t
SKEW
A
B
=
t
PLH
V
OD3
–
V
t
OD
PHL
R
LDIFF
60
375
375
t
t
1.5V
LZ
HZ
1.5V
V
V
R
R
C
C
OL
OH
L1
L2
t
V
PHL
+ 0.5V
TST
– 0.5V
V
90% POINT
t
OC
F
3V
0V
10% POINT
V
V
OL
OH
0V
–5–
A, B
RO
RE
R
R
0V
0V OR 3V
Test Circuit 5. Receiver Propagation Delay
Figure 4. Receiver Enable/Disable Timing
DE IN
RE IN
+1.5V
–1.5V
Test Circuit 6. Receiver Enable/Disable
Figure 3. Receiver Propagation Delay
Test Circuit 4. Driver Enable/Disable
t
1.5V
t
PLH
t
0V
ZH
S1
ZL
A
B
1.5V
1.5V
1.5V
DE
RE
RE
t
A
B
SKEW
O/P HIGH
O/P LOW
S1
=
t
C
PLH
L
C
–
C
L
L
V
t
PHL
OUT
R
t
t
1.5V
HZ
LZ
L
t
V
PHL
0V
V
OUT
OUT
R
V
V
ADM485
L
OL
OH
1.5V
V
+ 0.5V
– 0.5V
CC
S2
V
3V
0V
CC
S2
V
V
OL
OH
V
V
OH
OL