1.8V to 4.25V-Powered,
True RS-232 Dual Transceiver
MAX218
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, V
CC
= 1.8V, all transmitter outputs loaded with 3k鈩? T
A
= +25擄C, unless otherwise noted.)
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
1 TRANSMITTER FULL DATA RATE
1 TRANSMITTER 1/8 DATA RATE
R
L
= 3k鈩?+ 2500pF
240kbps
80
60
40
20
0
1.8
2.4
3.0
3.6
4.2
SUPPLY VOLTAGE (V)
120kbps
20kbps
0kbps
MAX3218-01
TRANSMITTING SUPPLY CURRENT
vs. LOAD CAPACITANCE
V
CC
= 2.4V
90
SUPPLY CURRENT (mA)
80
70
60
50
40
30
20
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
20kbps
120kbps
235kbps
TRANSMITTER 1 OPERATING
AT SPECIFIED BIT RATE,
TRANSMITTER 2 OPERATING
AT 1/16 THAT RATE.
MAX3218-02
140
120
SUPPLY CURRENT (mA)
100
100
TIME TO EXIT SHUTDOWN
(ONE TRANSMITTER HIGH,
ONE TRANSMITTER LOW)
SHDN
V
OH
2V/div
T_OUT
V
CC =
1.8V
R
L
= 3k鈩?|| 2500pF
100碌s/div
V
OL
TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CAPACITANCE AT 120kbps
TRANSMITTER OUTPUT VOLTAGE (V)
6
4
2
0
-2
-4
V
OUT-
-6
-8
0
1000
2000
3000
4000
5000
LOAD CAPACITANCE (pF)
0
0
2
MAX3218-04
SLEW RATE vs.
TRANSMITTER CAPACITANCE
MAX3218-05
8
V
OUT+
12
10
SLEW RATE (V/碌s)
+SLEW
8
6
4
DATA RATE 120kbps,
TRANSMITTERS LOADED WITH
3k鈩?PLUS INDICATED CAPACITANCE
1000
2000
3000
4000
-SLEW
5000
LOAD CAPACITANCE (pF)
4
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