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MAX3325EAI
3V dual RS-232 transceiver with LCD supply and contrast controller.
19-1573' Rev (Y 10199
2llAUg2ClLAlAl
3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
General Description
The MAX3325 integrates a two-transmitter, two-receiver
RS-232 transceiver with an LCD supply plus tempera-
ture-compensated contrast control. It is intended for
small 3V instruments requiring a 5V supply for either
logic or an LCD display, an adjustable bias signal for
contrast, LCD temperature compensation, and an
RS-232 interface for serial communications.
The 5V supply is a regulated charge pump followed by
a low-dropout (LDO) linear regulator capable of supply-
ing 11mA for the 5V LCD power.
The MAX3325 has an internal 6-bit digital-to-analog
converter (DAC) providing 64 contrast levels, plus an
internal temperature sensor that compensates the
LCD'S contrast for changes in ambient temperature.
The LCD contrast can be designed for any voltage
range from EV to +2V.
The MAX3325's 250kbps RS-232 transceiver meets all
El/V232E specifications with input voltages from +3.0V
to +3.6V. Both the RS232 section and the LCD supply
circuitry can be independently placed in shutdown, tai-
Ioring power consumption for battery-powered equip-
ment, The MAX3325 is available in 28-pin SSOP and
narrow DIP packages,
Applications
PDAs and Palmtop Computers
Handy Terminals
GPS Receivers
Hand-Held Medical Equipment
Industrial Test Equipment
Typical Operating Circuit appears at end of data sheet.
lVI/JXI/VI
F ea tures
+3.0V to +3.6V Single-Supply Operation
Provides 5.0V Regulated Output at 11mA in
3V Systems
6-Bit DAC with UpIDown Interface for LCD
Contrast Adjustment
Selectable Positive or Negative LCD Bias
Meets EIA-232E Specifications at 250kbps-
Guaranteed
1pA Shutdown Mode
Uses Small 0.22pF Capacitors-No Inductors
Required
Temperature Sensor for LCD Contrast
Compensation
Simple, Flexible Design Procedure for a Broad
Range of LCD Displays
Ordering Informa tion
PART TEMP. RANGE PIN-PACKAGE
MAX3325CAI 0°C to +70°C 28 SSOP
MAX3325CNI 0°C to +70°C 28 Narrow Plastic DIP
MAX3325EAI -40°C to +85''C 28 SSOP
MAX3325ENI -40°C to +85°C 28 Narrow Plastic DIP
Pin Configura tion
TOP VIEW
Ci!) [I E on
c2- [E E l/t
V- E El V00
R2IN E E GND
RilN E MAXIM E c1-
Riout E MAX3325 E REG
R20UT E E nout
l/r E E tzour
LCD [I E TIIN
TEMP [E E T2IN
REF- E El m
FB IE E s/cr)
REF; E Ei W
OAC IE IS] U_P
SS0PlDlP
Maxim Integrated Products 1
& the latest literature: http://, .
For small orders, phone 1-800-835-8769.
QZ££XVW
MAX3325
3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
ABSOLUTE MAXIMUM RATINGS
VDD,VL10 GND ___lVVF_______FFFFFFF_llVlV -O.3V to +6V
LCD, REF-,TEMP10 GND ..................... -6Vto (VDD + 0.3V)
V+ to GND (Note 1) TVt ..... -O.3V to +7V
V- to GND (Note 1).
V+ to N-l (Note 1) ......
REF+, FB, R_OUT to GND .....
,+O.3V to -7V
............. +13V
.......... -O.3V10 (VL + 0.3V)
Input Voltages -
T_OUT, SDLCD, SD232, UP, DOWN to GND ,,,,,,, 03V to +6V
R_IN to GND ................................................................... t25V
Output Voltages
T_OUTto GND ____FF_FFlF__F__FllFFFFFFFlFFFFFFl_ +_13V
R_OUT to GND -(13V to (VL + 0.3V)
REGIO GND .................................. -O.3Vto +6V
Short-Circuit Duration (LOUT, REF+, REF-) ............. Continuous
Continuous Output Current
REG... ........... 75mA
LCD... ........... 40mA
Continuous Power Dissipation
28-Pin SSOP (derate 9.52mW/°C above +70°C) ......... 762mW
28-Pin NDIP(deraIe14.3mW/°C above +70°C) ........ 1143mW
Operating Temperature Range
MAX3325C_I .................................................. 0°C to +70°C
MAX3325E_I .............................................. 40°C to +85°C
Storage Temperature Range .......................... 435°C to +150°C
Lead Temperature (soldering, 10sec) ........................... +300°C
Note 1: V+ and V» can have maximum magnitudes of +7V, but their absolute difference cannot exceed 13V.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is no! implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability
ELECTRICAL CHARACTERISTICS
(VDD = +3IN to +3.6V, VL = +3.3V, circuit and components of Figure 1, TA = TMIN to TMAx, unless otherwise noted. Typical values
are at VDD = +3,3V, TA = +25°C.)
PARAMETER l CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
VDD Supply Current No load, VDD = VL = 3.3V, TA = +25°C 2 4 mA
VL Supply Current No load, VDD = VL = 3.3V, TA = +25°C 05 10 pA
VDD Shutdown Supply Current SSSSEIVSLD:§.2V= EEfélsingul pins = GND or VDD' 0.5 10 pA
DlGlTAL-TO-ANALOG CONVERTER
Resolution Guaranteed monotonic 6 Bits
Full-Scale Voltage No load 1,1 3 1.2 127 V
Zero-Scale Voltage No load -15 0 10 mV
Output Impedance 0 < VDAC < VREH, IDAC S10pA 35 50 65 k9
TEMPERATURE SENSOR
TEMP Output TA = +25°C -32 V
Eigggi/ggfge Temperature ITEMP < 22PA -18 mV/°C
POSITIVE LINEAR REGULATOR
_ ' "tet 3.15V, IREG = 0 to 4.7 5 5.3
REG Output Voltage Lt3,niri=tr2,a/ied with v
' Vcc 2 3.0V, IREG = 010
Line Regulation 3V < VDD < 3.6V 6 50 mV
Short-Circuil Current 50 mA
NEGATIVE LINEAR REGULATOR-LCD BIAS
Feedback Regulation Point -20 0 20 mV
Input Leakage Current (Note 2) VFB = O, CMOS input -10 0 10 nA
LCD Load Regulation (Note 3) VLCD = -4.0V, load = 0 to -3mA 20 mV
lVI/JXI/VI
