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MAX3325EAI+T

P1-P3P4-P6P7-P9P10-P12
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
MAX3325
3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
_______________________________________________________________________________________
5
40µs/div
SD232
T2OUT
T1OUT
5V/div
0
2V/div
0
V
CC
= 3.3V
C1–C4 = 0.1µF
TRANSMITTER OUTPUTS EXITING
SHUTDOWN OR POWERING UP
MAX3325toc04
C
L
= 2500pF
2
µs/div
LOOPBACK WAVEFORMS AT 120kbps
T1IN
5V/div
T1OUT/
R1IN
5V/div
R1OUT
5V/div
MAX3325toc05
C
L
= 1000pF
1µs/div
LOOPBACK WAVEFORMS AT 250kbps
T1IN
5V/div
T1OUT/
R1IN
5V/div
R1OUT
5V/div
MAX3325toc06
C
L
= 1000pF
0
2
1
4
3
5
6
02010 30 40
V
REG
vs. LOAD CURRENT
MAX3325toc07
LOAD CURRENT (mA)
V
REG
(V)
V
DD
= +3V
V
DD
= +3.3V
V
DD
= +3.6V
0
2
1
4
3
5
6
02010 30 40
V
REG
vs. LOAD CURRENT
AND TEMPERATURE
MAX3325toc08
LOAD CURRENT (mA)
V
REG
(V)
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
-4.5
-3.5
-4.0
-2.5
-3.0
-2.0
-1.5
-40 0 20-20 40 60 80 100
TEMP OUTPUT VOLTAGE
vs. TEMPERATURE
MAX3325toc09
TEMPERATURE (°C)
TEMP OUTPUT VOLTAGE (V)
Typical Operating Characteristics (continued)
(V
DD
= V
L
= +3.3V, circuit and components of Figure 1, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3325
3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
6 _______________________________________________________________________________________
NAME FUNCTION
1 C2+ Positive Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 0.22µF capacitor.
2 C2- Negative Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2- to C2+ with a 0.22µF capacitor.
PIN
3 V- Output of Negative Charge Pump. Bypass V- to GND with a 0.22µF capacitor.
4, 5 R_IN RS-232 Receiver Inputs
10 TEMP
Output of Temperature Sensor. Connect TEMP to FB with a series resistor to compensate LCD contrast for
changing temperature. Bypass TEMP with a 0.22µF capacitor to GND.
9 LCD
Output of Negative Regulator. Connect LCD to FB with a series resistor. Bypass with a 0.47µF capacitor to
GND.
8 V
L
Supply Input for Receiver Outputs. Connect V
L
to the system logic supply voltage.
6, 7 R_OUT TTL/CMOS Receiver Outputs
15
UP DAC Adjust Input. A falling edge on UP increments the internal 6-bit DAC counter.
14 DAC Output of Internal 6-Bit DAC. Connect DAC to FB with a series resistor to adjust LCD voltage.
13 REF+ Output of Positive Reference, +1.2V. Bypass REF+ with a 0.22µF capacitor to GND.
12 FB Feedback Input for Negative Regulator. Regulates when FB is at zero (0).
11 REF- Output of Negative Reference, -1.2V. Bypass REF- with a 0.22µF capacitor to GND.
Pin Description
16
DOWN DAC Adjust Input. A falling edge on DOWN decrements the internal 6-bit DAC counter.
17
SDLCD
Active-Low Shutdown-Control Input for Both Regulators, References, DAC, and Temperature Sensors. Drive
SDLCD low to disable all analog circuitry. Drive high to enable the analog circuitry.
26 V
DD
+3.0V to +3.6V Supply Voltage. Bypass V
DD
with a 0.22µF capacitor to GND.
25 GND Ground
24 C1- Negative Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1- to C1+ with a 0.22µF capacitor.
18
SD232
Active-Low Shutdown-Control Input for Transmitter Outputs. Drive SD232 low to disable the RS-232
transmitters. Drive high to enable the transmitters.
23 REG Output of Positive Regulator. Bypass REG with a 4.7µF capacitor to GND.
21, 22 T_OUT RS-232 Transmitter Outputs
19, 20 T_IN TTL/CMOS Transmitter Inputs
28 C1+ Positive Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1+ to C1- with a 0.22µF capacitor.
27 V+ Output of Positive Charge Pump. Bypass V+ to V
DD
with a 0.22µF capacitor.
P1-P3P4-P6P7-P9P10-P12

MAX3325EAI+T

Mfr. #:
Buy MAX3325EAI+T
Manufacturer:
Maxim Integrated
Description:
RS-232 Interface IC 3V Dual Tcvr w/LCD S&C Controller
Lifecycle:
New from this manufacturer.
Delivery:
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