LTC2855 Linear Technology, LTC2855 Datasheet - Page 5

• Manufacturer Part Number: LTC2855
• Description: 3.3V 20Mbps RS485/RS422 Transceivers
• Manufacturer: Linear Technology

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TEST CIRCUITS
GND
OR
V
CC
GND
V
OR
DI
CC
Figure 1. Driver DC Characteristics
DI
DRIVER
DI
DRIVER
DE
DRIVER
Y
Z
Y
Z
Y
Z
V
Figure 5. Driver Enable and Disable Timing Measurements
+
OD
–
R
C
C
DIFF
285455 F04a
L
L
Figure 3. Receiver Input Current and Input Resistance
R
R
L
L
R
R
285455 F05a
C
C
L
L
Figure 4. Driver Timing Measurement
GND
OR
V
V
OR
GND
V
CC
CC
V
IN
+
OC
–
+
–
I
IN
R
A OR B
B OR A
IN
=
V
I
IN
IN
RECEIVER
GND
OR
V
Y OR Z
Z OR Y
CC
285455 F03
Y, Z
DE
Y-Z
DI
DI
V
V
V
V
V
0V
OH
0V
CC
CC
OL
0V
CC
V
Figure 2. Driver Output Short-Circuit Current
O
V
DRIVER
O
1/2 V
1/2 V
CC
10%
O
t
PLHD
LTC2854/LTC2855
90%
t
t
t
t
ZHSD
ZLSD
ZLD ,
ZHD ,
Y
Z
0
1/2 V
1/2 V
t
SKEWD
t
RD
CC
CC
t
PHLD
0
285455 F01-2
t
t
I
t
SHDN
HZD ,
OSD
LZD
90%
10%
+
–
t
FD
–7V to +12V
0.5V
0.5V
285455 F04b
285455 F05b
285455fa
5