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MAX3325
3V, Dual RS-232 Transceiver with LCD Supply and Contrast Controller
+3V RS-232 Transceiver Provides Power/Bias to LCD Display
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Status
Active: In Production.
Description
The MAX3325 integrates a two-transmitter, two-receiver RS-232 transceiver with an LCD supply plus temperature-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 supplying 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 -5V to +2V.
The MAX3325's 250kbps RS-232 transceiver meets all EIA-232E specifications with input voltages from +3.0V to +3.6V. Both the RS-232 section and the LCD supply circuitry can be independently placed in shutdown, tailoring power consumption for battery-powered equipment. The MAX3325 is available in 28-pin SSOP and narrow DIP packages.
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Data Sheet
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Key Features
- +3.0V to +3.6V Single-Supply Operation
- Provides 5.0V Regulated Output at 11mA in 3V Systems
- 6-Bit DAC with Up/Down Interface for LCD Contrast Adjustment
- Selectable Positive or Negative LCD Bias
- Meets EIA-232E Specifications at 250kbps-Guaranteed
- 1µA Shutdown Mode
- Uses Small 0.22µF Capacitors-No Inductors Required
- Temperature Sensor for LCD Contrast Compensation
- Simple, Flexible Design Procedure for a Broad Range of LCD Displays
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Applications/Uses
- GPS Receivers
- Handheld Medical Equipment
- Handy Terminals
- Industrial Test Equipment
- PDAs and Palmtop Computers
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Key Specifications:
| RS-232 Line Driver/Receivers |
| Part Number |
VSUPPLY
(V) |
Tx |
Rx |
Data Rate
(kbps) |
ICC
(mA) |
Internal Charge Pump |
Ext. Caps |
Cap. Value
(µF) |
Rx Active in Shutdn |
Package/Pins |
Budgetary Price |
| min |
typ |
nom |
See Notes |
| MAX3325 |
3.3 |
2 |
2 |
250 |
2 |
Yes |
4 |
0.22 |
2 |
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$3.57 @1k |
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See All RS-232 Line Driver/Receivers (152)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Product Guides
Reliability Reports
| Show FIT data for: |
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Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX3325CAI
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-2*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX3325CAI-T
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Active |
SSOP;28 pin
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| MAX3325CNI
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Active |
PDIP(N);28 pin;289.5 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: N28-4*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX3325EAI
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX3325EAI+
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3325EAI+T
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+2*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3325EAI-T
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX3325ENI
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Active |
PDIP(N);28 pin;289.5 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: N28-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1573
Rev 0;
1999-10-01
This page last modified: 2007-06-05
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