Datasheet

MAX3325
3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
4 _______________________________________________________________________________________
-6
-2
-4
2
0
4
6
0 20001000 3000 4000 5000
TRANSMITTER OUTPUT VOLTAGE vs.
LOAD CAPACITANCE
MAX3325toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
-5
-1
-3
3
1
5
V
OUT+
V
OUT-
0
4
2
8
6
12
10
14
0 20001000 3000 4000 5000
SLEW RATE vs. LOAD CAPACITANCE
MAX3325toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
FOR DATA RATES
UP TO 250kbps
0
10
30
20
40
50
0 1000 2000 3000 4000 5000
SUPPLY CURRENT vs. LOAD
CAPACITANCE (T1 = 20kbps)
MAX3325toc03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
T2 = 120kbps
T2 = 250kbps
T2 = 20kbps
Typical Operating Characteristics
(V
DD
= V
L
= +3.3V, circuit and components of Figure 1, all transmitters loaded with 3kΩ,T
A
= +25°C, unless otherwise noted.)
TIMING CHARACTERISTICS
(V
DD
= +3.0V to +3.6V, V
L
= +3.3V, circuit and components of Figure 1, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at V
DD
= +3.3V, T
A
= +25°C.)
Note 2: Guaranteed by design and not production tested.
Note 3: No load on REG or transmitter outputs.
t
PLH
300
PARAMETER SYMBOL MIN TYP MAX UNITS
Transition-Region Slew Rate 630V/µs
Transmitter Skew | t
PLH
- t
PHL
| 200 ns
Receiver Propagation Delay
Maximum Data Rate 250 kbps
t
PHL
300
ns
Receiver Skew | t
PLH
- t
PHL
| 300 ns
CONDITIONS
V
DD
= 3.3V, T
A
= +25°C, R
L
= 3kΩ to
7kΩ, C
L
= 150pF to 1000pF, measured
from +3V to -3V or -3V to +3V
R
L
= 3kΩ, C
L
= 1000pF, one transmitter
switching
Receiver input to receiver output,
C
L
= 150pF