Datasheet

RS-485 Transceivers with Integrated
100 Ω /120 Ω Termination Resistors
MAX13450E/MAX13451E
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(V
CC
= +5V, V
L
= +1.8V, T
A
= +25NC, unless otherwise noted.)
100Ω TERMINATION RESISTOR
vs. FREQUENCY
FREQUENCY (MHz)
MAGNITUDE (Ω)
PHASE (DEGREE)
101
20
40
60
80
100
120
140
0
0.1 100
0
-10
-20
-30
MAX13450E/51E toc11
R
100
MAGNITUDE
R
100
PHASE
120Ω TERMINATION RESISTOR
vs. FREQUENCY
FREQUENCY (MHz)
MAGNITUDE (Ω)
PHASE (DEGREE)
101
20
40
60
80
100
120
140
0
0.1 100
0
-10
-20
-30
MAX13450E/51E toc12
R
120
MAGNITUDE
R
120
PHASE
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
MAX13450E/51E toc10
TEMPERATURE (°C)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE (V)
1109580655035205-10-25
1
2
3
4
5
0
-40 125
R
DIFF
= 54Ω
TERMINATION RESISTANCE
vs. TEMPERATURE
MAX13450E/51E toc13
TEMPERATURE (°C)
TERMINATION RESISTANCE (Ω)
1109580655035205-10-25
90
100
110
120
130
80
-40 125
120Ω RESISTOR
100Ω RESISTOR
DRIVER PROPAGATION DELAY (250kbps)
(MAX13451E)
MAX13450E/51E toc14
1µs/div
DI
1V/div
A
1V/div
B
1V/div
SRL = HIGH
DE = HIGH
RE = HIGH
DRIVER ENABLE TIME FROM SHUTDOWN
(MAX13451E)
MAX13450E/51E toc15
200ns/div
DE
2V/div
A
2V/div
B
2V/div
SRL = LOW
RE = HIGH