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

Field	Value
MPN	MAX7219CWG+T
Manufacturer	Analog Devices
Description	Serially interfaced, 8-digit LED display driver
Package in project	24-pin Wide SO / SOIC
Footprint asset	SOIC127P1032X265-24N.kicad_mod
3D model asset	MAX7219CWG+T.stp
Schematic pin count	24
Footprint pad count	24

Datasheet metadata extracted

Category	Extracted data
Device type	Serial input/output common-cathode LED display driver for up to 8 digits, bar graphs, or 64 LEDs
Interface	10 MHz serial interface
Internal functions	BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, 8x8 static RAM
LED current programming	One external resistor on ISET sets peak segment current
Brightness control	Digital and analog brightness control
Startup behavior	Display blanked on power-up; enters shutdown on initial power-up
Shutdown current	150 µA low-power shutdown, with data retained
Display control registers	Decode mode, intensity, scan limit, shutdown, display test
Display range	Scan-limit register supports 1 to 8 digits
Special note	MAX7221 variant adds slew-rate-limited drivers and SPI/QSPI/MICROWIRE compatibility; this is not a MAX7219-only feature

Absolute maximum ratings

Parameter	Rating
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 current	500 mA
SEG A-G, DP source current	100 mA
Continuous power dissipation, Wide SO at TA = +85°C	941 mW
Wide SO derating above +70°C	11.8 mW/°C
Storage temperature	-65°C to +160°C
Lead temperature, soldering 10 s	+300°C

Recommended operating conditions

Parameter	Value
Operating supply voltage V+	4.0 V min, 5.5 V max
Operating temperature, MAX7219C_G	0°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 current	40 mA

Key electrical characteristics

Parameter	Value
Logic high input voltage VIH	3.5 V min
Logic low input voltage VIL	0.8 V max
Input current IIH / IIL	-1 µA to 1 µA
Output low voltage VOL	0.4 V
Output high voltage VOH	V+ - 1 V
Hysteresis on DIN/CLK/LOAD/CS	1 V
Clock period tCP	100 ns min
CLK high pulse width tCH	50 ns min
CLK low pulse width tCL	50 ns min
DIN setup time tDS	25 ns min
DIN hold time tDH	0 ns min
LOAD/CS pulse high tCSW	50 ns min
Data propagation delay tDO	25 ns
Data-to-segment delay tDSPD	2.25 ms
Digit drive sink current IDIGIT	320 mA
Display scan rate	500 Hz min, 800 Hz typ, 1300 Hz max
Segment current matching	3.0%

Pin functions confirmed from datasheet

Pin / Function	Datasheet summary
DIN	Serial-data input, sampled on CLK rising edge
DOUT	Serial-data output, valid 16.5 clock cycles later, used for daisy chaining
CLK	Serial clock input, 10 MHz max
LOAD / CS	Latches the last 16 bits on rising edge
DIG0-DIG7	Digit drive outputs, sink current from common-cathode display
SEG A-G, DP	Segment outputs, source current to LED segments
ISET	Connect through resistor to VDD/V+ to set peak segment current
V+	Positive supply, connect to +5 V
GND pins	Both grounds must be connected

Package dimensions from datasheet

Parameter	24 Wide SO
Body length D	15.20 mm to 15.60 mm
Body width E	7.40 mm to 7.60 mm
Lead span H	10.00 mm to 10.65 mm
Overall height A	2.35 mm to 2.65 mm
Standoff A1	0.10 mm to 0.32 mm
Lead width B	0.23 mm to 0.35 mm
Lead thickness C	0.30 mm to 0.49 mm
Lead pitch e	1.27 mm
Lead length L	0.40 mm to 1.27 mm
Lead angle	0° to 8°

Symbol and footprint cross-check

What matches

Check	Result
Pin count	Pass - symbol exposes 24 terminals and footprint has 24 pads
Package family	Pass - project uses a 24 Wide SO / SOIC footprint, matching datasheet ordering info for MAX7219CWG
Pitch	Pass - footprint is 1.27 mm pitch, matching datasheet
Body size	Pass - footprint body is about 15.4 mm x 7.5 mm, matching datasheet ranges for D and E
3D model presence	Pass - 3D model asset is attached

Issues that should be fixed

Issue	Risk	Evidence
All symbol pins are typed as Unspecified	ERC quality and downstream part quality are degraded	Every terminal in the schematic is currently `Pin Type: Unspecified`
Symbol uses generic terminal parts instead of a unified IC symbol	Higher chance of incorrect reuse and weaker readability	The 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_2	Can cause incorrect symbol semantics and easier wiring mistakes in reuse	Datasheet explicitly states both GND pins must be connected
No visible net validation yet	Real connectivity errors would not be caught from this part project alone	Project 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

Category	Status
Wrong package ordered	Low risk - package and footprint family match
Footprint dimensional mismatch	Low risk - dimensions and pitch align well
Solderability risk from pad geometry	Low risk from current evidence
Board failure from package mismatch	Low risk from current evidence
Board failure from symbol pin-type / symbol-quality issues	Moderate risk for reuse and wiring mistakes
Need final pin-map sanity check	Yes

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

51 days

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