MAX3291 Maxim, MAX3291 Datasheet - Page 9

• Manufacturer Part Number: MAX3291
• Description: RS-485/RS-422 Transceivers with Preemphasis for High-Speed / Long-Distance Communication
• Manufacturer: Maxim

Figure 9. Receiver Propagation Delay Test Circuit
X = Don’t care
Z = High impedance
SHUTDOWN = Low-power shutdown; driver and receiver outputs are high impedance.
RE
X
X
0
1
for High-Speed, Long-Distance Communication
RS-485/RS-422 Transceivers with Preemphasis
ATE
INPUTS
DE
1
1
0
0
_______________________________________________________________________________________
TRANSMITTING
V
ID
DI
1
0
X
X
Figure 11. Time-to-Shutdown Test Circuit
High-Z
B
A
Z
0
1
SHUTDOWN
High-Z and
OUTPUTS
R
R
High-Z
RO
Y
1
0
C
L
RE
DI
DE
MAX3291
MAX3292
Figure 10. Preemphasis Timing
0 DIFFERENTIAL
RE
0
0
0
1
1
Y
Z
INPUTS
N
N
V
CC
1k
INPUTS
DE
X
X
X
1
0
RO
RECEIVING
t
PRE
Y
Z
t
P
PTND
P
80%
≤ -0.2V
≥ 0.2V
Function Tables
Open
A-B
20%
X
X
50%
Y
Z
N
N
SHUTDOWN
High-Z and
OUTPUT
High-Z
RO
1
0
1
Z
Y
P
P
9