Datasheet

RS-485 Transceivers with Integrated
100 Ω /120 Ω Termination Resistors
MAX13450E/MAX13451E
12 _____________________________________________________________________________________
Pin Description (continued)
Function Tables
Table 1. Termination Resistor Control
(MAX13450E/MAX13451E)
Table 4. Function Table for Receiver
(MAX13450E)
Table 5. INV Input Function Table for
Transmitter (MAX13451E)
Table 2. Shutdown Control (MAX13450E/
MAX13451E)
Table 3. Function Table for Transmitter
(MAX13450E)
PIN
NAME FUNCTION
MAX13450E MAX13451E
10 — Y Noninverting Driver Output
11 11 GND Ground
12 — Z Inverting Driver Output
13 13 TERM100
Termination Resistor Value Selection Input. Drive TERM100 low to select a 120I
termination and high to select a 100I termination. The TERM100 input is refer-
enced to V
L
.
14 14 SRL
Slew-Rate Limiting-Enable Input. Drive SRL high to enable slew-rate limiting and
low to disable slew-rate limiting. The SRL input is referenced to V
L
.
— 8 INV
Inversion Input. Drive INV high to internally swap RO logic level with respect to A
and B signals.
— 9 FAULT
Fault Flag Output. FAULT asserts high in overcurrent conditions or if A/B are forced
below GND or above V
CC
when the driver is enabled. FAULT is referenced to V
L
.
— — EP Exposed Pad. Connect EP to GND. Do not use EP as the only GND connection.
TERM
DE
RE
TERMINATION RESISTOR
Low X X Activated
High X X Not activated
DE
RE TERM
STATE
Low High High Shutdown
INPUT OUTPUT
DE DI Y Z
Low X High-Z High-Z
High
Low Low High
High High Low
INPUT OUTPUT
RE
A-B RO
High X High-Z
Low
R -50mV or Open
High
P -200mV
Low
INPUT OUTPUT
DE INV DI A B
Low X X High-Z High-Z
High
Low
Low Low High
High High Low
High
Low High Low
High Low High