MAX13448E
±80V Fault-Protected Full-Duplex
RS-485 Transceiver
8 _______________________________________________________________________________________
Y
Z
V
OD
V
OC
R
L
/2
R
L
/2
Figure 1. Driver DC Test Load
DI
DE
V
CC
Z
Y
V
O
R
L
C
L
C
L
Figure 2. Driver Timing Test Circuit
DI
V
CC
0
Z
Y
V
O
0
-V
O
V
O
V
CC
/2
t
DPLH
t
DPHL
1/2 V
O
10%
t
LH
90%
90%
1/2 V
O
10%
t
HL
V
OD
= V (Y) - V (Z)
V
OD
t
SKEW
=
|t
DPLH
-
t
DPHL
|
Figure 3. Driver Propagation Delays
Pin Description
PIN NAME FUNCTION
1, 8, 13 N.C. No Connection. Not internally connected. Connect N.C. to GND or leave it unconnected.
2 RO Receiver Output. If receiver is enabled and (A - B) ≥ -50mV, RO = high; if (A - B) ≥ -200mV, RO = low.
3 RE
Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive
RE high and DE low to enter low-power shutdown mode.
4DE
Driver Output Enable. Drive DE high to enable the driver outputs. Drive DE low to put the outputs in
high impedance. Drive RE high and DE low to enter low-power shutdown mode.
5DI
Driver Input. Drive DI low to force the noninverting output low and the inverting output high. Drive DI
high to force the noninverting output high and the inverting output low.
6, 7 GND Ground
9 Y Noninverting Driver Output
10 Z Inverting Driver Output
11 B Inverting Receiver Input
12 A Noninverting Receiver Input
14 V
CC
Positive Supply. V
CC
= +3.0V to +5.5V. Bypass V
CC
to GND with a 1µF ceramic capacitor as close
to V
CC
as possible. Typical V
CC
values are at V
CC
= +3.3V and V
CC
= +5.0V.
