Datasheet

RS-485 Transceivers with Integrated
100 Ω /120 Ω Termination Resistors
MAX13450E/MAX13451E
______________________________________________________________________________________ 11
Pin Configurations
Pin Description
+
TOP VIEW
TSSOP
114 GNDV
CC
123 ZDI
132 TERM100RE
141 SRLDE
87 ARO
96 BV
L
105 YTERM
*EP
MAX13450E
+
TOP VIEW
TSSOP
114 GNDV
CC
123 BDI
132 TERM100RE
141 SRLDE
87 INVRO
96 FAULTV
L
105 ATERM
*EP
*CONNECT EP TO GND
MAX13451E
PIN
NAME FUNCTION
MAX13450E MAX13451E
1 1 DE
Driver-Output Enable. Drive DE low to put the driver output in three-state. Drive DE
high to enable the driver. DE is referenced to V
L
.
2 2
RE
Receiver-Output Enable. Drive RE low to enable the RO. Drive RE high to disable
the RO output and put the RO output in a high-impedance state. RE is referenced
to V
L
.
3 3 DI
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 inverting out-
put low. DI is referenced to V
L
.
4 4 V
CC
Power-Supply Voltage. Bypass V
CC
to GND with a 0.1FF ceramic capacitor
placed as close as possible to the device.
5 5
TERM
Active-Low Termination Resistor Enable. Drive TERM low to enable the internal ter-
mination resistor. TERM is referenced to V
L
.
6 6 V
L
Logic Supply Voltage. Bypass V
L
to GND with a 0.1FF ceramic capacitor placed
as close as possible to the device.
7 — RO
Receiver Output. When receiver is enabled and V
A
- V
B
R -50mV, RO is high. If
V
A
- V
B
P -200mV, RO is low. RO is referenced to V
L
.
— 7 RO
Receiver Output. When INV is low, receiver is enabled and V
A
- V
B
R -50mV, RO is
high. If V
A
- V
B
P -200mV, RO is low. When INV is high, receiver is enabled and
V
A
- V
B
R -50mV, RO is low. If V
A
- V
B
P -200mV, RO is high. RO is referenced to V
L
.
8 — A Noninverting Receiver Input
— 10 A
If INV is low, A is a noninverting receiver input and a noninverting driver output. If
INV is high, A is an inverting receiver input and an inverting driver output.
9 — B Inverting Receiver Input
— 12 B
If INV is low, B is an inverting receiver input and an inverting driver output. If INV
is high, B is a noninverting receiver input and a noninverting driver output.