Datasheet

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