adrian95 / MAX7219CWG+T

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Part Review and Datasheet Validation

flux

3:27

Considering.

Analyzing the schematic.

Reviewing the bill of materials.

Analyzing the PCB layout.

Looking for "device description and key features" in MAX7219CWG+T.pdf

Looking for "absolute maximum ratings" in MAX7219CWG+T.pdf

Looking for "recommended operating conditions supply voltage temperature segment current" in MAX7219CWG+T.pdf

Looking for "electrical characteristics logic input output segment driver digit driver timing" in MAX7219CWG+T.pdf

Looking for "pin configuration and pin description" in MAX7219CWG+T.pdf

Looking for "package information wide SO package dimensions 24 lead 300 mil" in MAX7219CWG+T.pdf

Looking for "ordering information package code CWG temperature range lead finish" in MAX7219CWG+T.pdf

Calcul.

Looking for "top view pin assignment 24 wide SO MAX7219" in MAX7219CWG+T.pdf

Looking for "MAX7219CWG package marking package outline land pattern wide SO 24 leads" in MAX7219CWG+T.pdf

Looking for "shutdown current display blanked on power up scan limit decode mode intensity control test mode" in MAX7219CWG+T.pdf

Part review summary for MAX7219CWG+T
Step 2 did not require action because this part project already has a datasheet URL set:
  • http://componentsearchengine.com/Datasheets/1/MAX7219CWG+T.pdf

Project metadata found

FieldValue
MPNMAX7219CWG+T
ManufacturerAnalog Devices
DescriptionSerially interfaced, 8-digit LED display driver
Package in project24-pin Wide SO / SOIC
Footprint assetSOIC127P1032X265-24N.kicad_mod
3D model assetMAX7219CWG+T.stp
Schematic pin count24
Footprint pad count24

Datasheet metadata extracted

CategoryExtracted data
Device typeSerial input/output common-cathode LED display driver for up to 8 digits, bar graphs, or 64 LEDs
Interface10 MHz serial interface
Internal functionsBCD code-B decoder, multiplex scan circuitry, segment and digit drivers, 8x8 static RAM
LED current programmingOne external resistor on ISET sets peak segment current
Brightness controlDigital and analog brightness control
Startup behaviorDisplay blanked on power-up; enters shutdown on initial power-up
Shutdown current150 µA low-power shutdown, with data retained
Display control registersDecode mode, intensity, scan limit, shutdown, display test
Display rangeScan-limit register supports 1 to 8 digits
Special noteMAX7221 variant adds slew-rate-limited drivers and SPI/QSPI/MICROWIRE compatibility; this is not a MAX7219-only feature

Absolute maximum ratings

ParameterRating
V+ to GND-0.3 V to 6 V
DIN, CLK, LOAD, CS to GND-0.3 V to 6 V
All other pins-0.3 V to (V+ + 0.3 V)
DIG0-DIG7 sink current500 mA
SEG A-G, DP source current100 mA
Continuous power dissipation, Wide SO at TA = +85°C941 mW
Wide SO derating above +70°C11.8 mW/°C
Storage temperature-65°C to +160°C
Lead temperature, soldering 10 s+300°C

Recommended operating conditions

ParameterValue
Operating supply voltage V+4.0 V min, 5.5 V max
Operating temperature, MAX7219C_G0°C to +70°C
Operating temperature, MAX7219E_G-40°C to +85°C
Segment drive source current ISEG-30 mA min, -40 mA typ, -45 mA max
Maximum recommended segment current40 mA

Key electrical characteristics

ParameterValue
Logic high input voltage VIH3.5 V min
Logic low input voltage VIL0.8 V max
Input current IIH / IIL-1 µA to 1 µA
Output low voltage VOL0.4 V
Output high voltage VOHV+ - 1 V
Hysteresis on DIN/CLK/LOAD/CS1 V
Clock period tCP100 ns min
CLK high pulse width tCH50 ns min
CLK low pulse width tCL50 ns min
DIN setup time tDS25 ns min
DIN hold time tDH0 ns min
LOAD/CS pulse high tCSW50 ns min
Data propagation delay tDO25 ns
Data-to-segment delay tDSPD2.25 ms
Digit drive sink current IDIGIT320 mA
Display scan rate500 Hz min, 800 Hz typ, 1300 Hz max
Segment current matching3.0%

Pin functions confirmed from datasheet

Pin / FunctionDatasheet summary
DINSerial-data input, sampled on CLK rising edge
DOUTSerial-data output, valid 16.5 clock cycles later, used for daisy chaining
CLKSerial clock input, 10 MHz max
LOAD / CSLatches the last 16 bits on rising edge
DIG0-DIG7Digit drive outputs, sink current from common-cathode display
SEG A-G, DPSegment outputs, source current to LED segments
ISETConnect through resistor to VDD/V+ to set peak segment current
V+Positive supply, connect to +5 V
GND pinsBoth grounds must be connected

Package dimensions from datasheet

Parameter24 Wide SO
Body length D15.20 mm to 15.60 mm
Body width E7.40 mm to 7.60 mm
Lead span H10.00 mm to 10.65 mm
Overall height A2.35 mm to 2.65 mm
Standoff A10.10 mm to 0.32 mm
Lead width B0.23 mm to 0.35 mm
Lead thickness C0.30 mm to 0.49 mm
Lead pitch e1.27 mm
Lead length L0.40 mm to 1.27 mm
Lead angle0° to 8°
Symbol and footprint cross-check

What matches

CheckResult
Pin countPass - symbol exposes 24 terminals and footprint has 24 pads
Package familyPass - project uses a 24 Wide SO / SOIC footprint, matching datasheet ordering info for MAX7219CWG
PitchPass - footprint is 1.27 mm pitch, matching datasheet
Body sizePass - footprint body is about 15.4 mm x 7.5 mm, matching datasheet ranges for D and E
3D model presencePass - 3D model asset is attached

Issues that should be fixed

IssueRiskEvidence
All symbol pins are typed as UnspecifiedERC quality and downstream part quality are degradedEvery terminal in the schematic is currently Pin Type: Unspecified
Symbol uses generic terminal parts instead of a unified IC symbolHigher chance of incorrect reuse and weaker readabilityThe schematic consists of 24 separate terminal objects such as DIN, CLK, DOUT, V
Ground pins are split into two separately named terminals, GND_1 and GND_2Can cause incorrect symbol semantics and easier wiring mistakes in reuseDatasheet explicitly states both GND pins must be connected
No visible net validation yetReal connectivity errors would not be caught from this part project aloneProject schematic currently reports no nets defined yet
Potential pin-mapping concern
I do not see a clear manufacturing-footprint mismatch from the current data. The footprint geometry looks consistent with the datasheet package.
However, there is one thing to verify carefully before releasing this as a reusable part:
  • The datasheet text extraction for the pin table is slightly inconsistent in OCR formatting, while the current symbol pin numbering appears internally consistent with the expected MAX7219 arrangement.
  • Because of that, I would treat the pin-number-to-pin-name mapping as mostly consistent but worth one final manual verification against the datasheet top-view before publishing broadly.

Manufacturing / ordering / failure-risk conclusion

CategoryStatus
Wrong package orderedLow risk - package and footprint family match
Footprint dimensional mismatchLow risk - dimensions and pitch align well
Solderability risk from pad geometryLow risk from current evidence
Board failure from package mismatchLow risk from current evidence
Board failure from symbol pin-type / symbol-quality issuesModerate risk for reuse and wiring mistakes
Need final pin-map sanity checkYes
Bottom line
  • The package selection and footprint look correct for MAX7219CWG+T.
  • The main weaknesses are in the symbol quality, not the footprint:
    • pin electrical types are missing
    • the symbol is built from separate terminals rather than a clean IC symbol
    • the two grounds should be clearly represented as required by the datasheet
  • I do not see a strong sign of a manufacturing-breaking footprint error, but I do recommend a final pin-map verification before using this part in hardware.
Check pin mapping
Review ERC issues
Create proper symbol
52 days
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MAX7219CWG+T

MAX7219CWG+T thumbnail
Serially Interfaced, 8-Digit LED Display Drivers #CommonPartsLibrary #IntegratedCircuit #power-management #Display-driver #MAX7219

Properties

MAX7219CWG+T

Analog Devices Inc./Maxim Integrated

Integrated Circuit

componentsearchengine.com/Datasheets/1/MAX7219CWG+T.pdf

IC

creativecommons.org/licenses/by/4.0/

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