LTC2854 LINER [Linear Technology], LTC2854 Datasheet - Page 6

• Manufacturer Part Number: LTC2854
• Description: 3.3V 20Mbps RS485/RS422 Transceivers with Integrated Switchable Termination
• Manufacturer: LINER [Linear Technology]

LTC2854/LTC2855
TEST CIRCUITS
6
RO
DI = 0V OR V
0V OR V
V
CC
V
±V
CM
±V
OR 0V
AB
AB
TE
CC
RECEIVER
/2
/2
CC
A
B
RECEIVER
A
B
A
B
RECEIVER
RE
Figure 7. Receiver Enable and Disable Timing Measurements
Figure 8. Termination Resistance and Timing Measurements
RO
+
–
+
–
Figure 6. Receiver Propagation Delay Measurements
I
A
V
V
AB
B
C
RO
L
R
R
L
TERM
285455 F07a
285455 F06a
C
L
V
OR
GND
=
CC
V
I
AB
A
TE
I
A
RO
RO
RE
V
0V
CC
A-B
RO
V
V
V
V
–V
0V
OH
0V
CC
CC
OL
V
V
AB
AB
CC
0
1/2 V
V
O
V
CC
O
90%
10%
90%
0
10%
t
t
t
t
ZHSR
ZLSR
ZHR
90%
ZLR
,
,
t
RTEN
t
t
R
SKEWR
1/2 V
1/2 V
1/2 V
t
PLHR
t
CC
RR
CC
CC
= t
1/2 V
PLHR
CC
1/2 V
– t
PHLR
CC
90%
t
t
10%
LZR
HZR
90%
t
F
10%
10%
t
PHLR
t
RTZ
t
0.5V
0.5V
FR
285455 F06b
285455F07
285455 F05b
285455fa