MAX3325CAI-T Maxim Integrated, MAX3325CAI-T Datasheet - Page 6

• Manufacturer Part Number: MAX3325CAI-T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3325r

Specifications of MAX3325CAI-T

• Data Rate: 250 Kbps
• Operating Supply Voltage: 3 V to 3.6 V
• Supply Current: 2 mA
• Operating Temperature Range: - 40 C to + 85 C
• Number Of I/os: 2 / 2
• Propagation Delay Time Ns: 300 ns

3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
6
19, 20
21, 22
PIN
4, 5
6, 7
10
11
12
13
14
15
16
17
18
23
24
25
26
27
28
_______________________________________________________________________________________
1
2
3
8
9
SDLCD
R_OUT
DOWN
T_OUT
NAME
SD232
TEMP
REF+
GND
R_IN
REF-
DAC
C2+
LCD
T_IN
REG
C1+
V
C2-
C1-
UP
FB
V+
V
V-
DD
L
Positive Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 0.22µF capacitor.
Negative Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2- to C2+ with a 0.22µF capacitor.
Output of Negative Charge Pump. Bypass V- to GND with a 0.22µF capacitor.
RS-232 Receiver Inputs
TTL/CMOS Receiver Outputs
Supply Input for Receiver Outputs. Connect V
Output of Negative Regulator. Connect LCD to FB with a series resistor. Bypass with a 0.47µF capacitor to
GND.
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.
Output of Negative Reference, -1.2V. Bypass REF- with a 0.22µF capacitor to GND.
Feedback Input for Negative Regulator. Regulates when FB is at zero (0).
Output of Positive Reference, +1.2V. Bypass REF+ with a 0.22µF capacitor to GND.
Output of Internal 6-Bit DAC. Connect DAC to FB with a series resistor to adjust LCD voltage.
DAC Adjust Input. A falling edge on UP increments the internal 6-bit DAC counter.
DAC Adjust Input. A falling edge on DOWN decrements the internal 6-bit DAC counter.
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.
Active-Low Shutdown-Control Input for Transmitter Outputs. Drive SD232 low to disable the RS-232
transmitters. Drive high to enable the transmitters.
TTL/CMOS Transmitter Inputs
RS-232 Transmitter Outputs
Output of Positive Regulator. Bypass REG with a 4.7µF capacitor to GND.
Negative Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1- to C1+ with a 0.22µF capacitor.
Ground
+3.0V to +3.6V Supply Voltage. Bypass V
Output of Positive Charge Pump. Bypass V+ to V
Positive Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1+ to C1- with a 0.22µF capacitor.
DD
with a 0.22µF capacitor to GND.
L
to the system logic supply voltage.
FUNCTION
DD
with a 0.22µF capacitor.
Pin Description