Datasheet

MAX3185
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Motherboards/Desktop PCs
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V
CC
= +5.0V, V
DD
= +12.0V, V
SS
= -12.0V, T
A
= +25°C, unless otherwise noted.)
-20
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX3185-TOC01
SUPPLY VOLTAGE (V)
SUPPLY CUREENT (mA)
-15
-10
-5
0
5
10
15
20
13.212.612.011.410.8
I
DD
, 240kbps
I
DD
, 120kbps
I
DD
, 20kbps 1 TRANSMITTER AT DATA RATE
2 TRANSMITTERS AT DATA RATE / 16
3kΩ + 2500pF LOAD
I
CC
I
SS
, 20kbps
I
SS
, 120kbps
I
SS
, 240kbps
SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3185-TOC02
LOAD CAPACITANCE (pF)
SUPPLY CUREENT (mA)
25
20
15
10
5
0
-5
-10
-15
-20
-25
4000 50003000200010000
I
DD
, 240kbps
I
DD
, 120kbps
I
DD
, 20kbps
I
CC
I
SS
,
20kbps
I
SS
, 120kbps
I
SS
, 240kbps
1 TRANSMITTER AT DATA RATE
2 TRANSMITTERS AT DATA RATE / 16
3kΩ + C
L
LOAD
SLEW RATE
vs. LOAD CAPACITANCE
MAX3185-TOC03
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
16
14
12
10
8
6
4
2
0
4000 50003000200010000
1 TRANSMITTER 240kbps
2 TRANSMITTERS 15kbps
3kΩ + C
L
LOAD
RISE
FALL

TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3185-TOC04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
12.5
10.0
7.5
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5
4000 50003000200010000
240kbps
120kbps
120kbps
240kbps
1 TRANSMITTER AT DATA RATE
2 TRANSMITTERS AT DATA RATE / 16
3kΩ + C
L
LOAD
MAX3185 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CURRENT PER TRANSMITTER
MAX3185-TOC05
LOAD CURRENT PER TRANSMITTER (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
15
10
5
0
-5
-10
-15
10 12 14 16 186824
0
VOUT+
VOUT-
T1
V
CC
V
OUT+
V
OUT-
T2
T3
SLEW RATE
vs. TEMPERATURE
MAX3185-TOC06
TEMPERATURE (°C)
SLEW RATE (V/µs)
25
20
15
10
5
0
85 105 12545 65525-35 -15-55
RISE, 500pF
FALL, 500pF
RISE, 2000pF
FALL, 2000pF