MAX13450E Datasheet, PDF (12/17 Pages) Maxim Integrated Products – RS-485 Transceivers with Integrated 100Ω/120Ω Termination Resistors

RS-485 Transceivers with Integrated
100Ω/120Ω Termination Resistors
Pin Description (continued)
PIN
MAX13450E MAX13451E
10
—
11
11
12
—
13
13
14
14
—
8
—
9
—
—
NAME
Y
GND
Z
TERM100
SRL
INV
FAULT
EP
FUNCTION
Noninverting Driver Output
Ground
Inverting Driver Output
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 VL.
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 VL.
Inversion Input. Drive INV high to internally swap RO logic level with respect to A
and B signals.
Fault Flag Output. FAULT asserts high in overcurrent conditions or if A/B are forced
below GND or above VCC when the driver is enabled. FAULT is referenced to VL.
Exposed Pad
Table 1. Termination Resistor Control
(MAX13450E/MAX13451E)
TERM ^DE RE
Low
X
X
High
X
X
TERMINATION RESISTOR
Activated
Not activated
Table 2. Shutdown Control (MAX13450E/
MAX13451E)
DE
RE
TERM
STATE
Low
High
High
Shutdown
Table 3. Function Table for Transmitter
(MAX13450E)
INPUT
DE
DI
Low
X
High
Low
High
OUTPUT
Y
Z
High-Z
High-Z
Low
High
High
Low
Function Tables
Table 4. Function Table for Receiver
(MAX13450E)
RE
High
Low
INPUT
A-B
X
R -50mV or Open
P -200mV
OUTPUT
RO
High-Z
High
Low
Table 5. INV Input Function Table for
Transmitter (MAX13451E)
DE
Low
High
INPUT
INV
X
Low
High
DI
X
Low
High
Low
High
OUTPUT
A
B
High-Z High-Z
Low
High
High
Low
High
Low
Low
High
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