Claude-skill-registry logicic

Use when working with 74xx and CD4xxx series logic ICs - standard TTL/CMOS logic gates, flip-flops, counters, decoders, multiplexers. Includes technology families (LS, HC, HCT, AC, AHC) and LogicICHandler guidance.

install

source · Clone the upstream repo

git clone https://github.com/majiayu000/claude-skill-registry

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/logicic" ~/.claude/skills/majiayu000-claude-skill-registry-logicic && rm -rf "$T"

manifest: skills/data/logicic/SKILL.md

Logic IC Manufacturer Skill

Overview

Logic ICs are standardized digital integrated circuits implementing basic logic functions. The two main families are:

74xx Series - TTL-based logic (originally Texas Instruments, now multi-source)
CD4xxx Series - CMOS-based logic (originally RCA, now multi-source)

These parts are produced by multiple manufacturers (TI, ON Semi, Nexperia, Diodes Inc, STMicroelectronics) with identical pinouts and functions.

MPN Structure

74xx Series

[PREFIX][FAMILY][SERIES][FUNCTION][PACKAGE]
   |       |       |        |         |
   |       |       |        |         +-- Package code (N, D, PW, etc.)
   |       |       |        +-- Function number (00, 04, 74, 138, etc.)
   |       |       +-- Fixed: "74" (commercial) or "54" (military temp)
   |       +-- Technology family (LS, HC, HCT, AC, AHC, etc.)
   +-- Optional manufacturer prefix (SN for TI)

Example Decoding

SN74HC595N
|  |  |  ||
|  |  |  |+-- N = DIP package
|  |  |  +-- 595 = 8-bit shift register function
|  |  +-- 74 = Commercial temperature range
|  +-- HC = High-speed CMOS family
+-- SN = Texas Instruments prefix

74LS04D
  |  ||
  |  |+-- D = SOIC package
  |  +-- 04 = Hex inverter function
  +-- LS = Low-power Schottky TTL family

CD4xxx Series

CD[FUNCTION][PACKAGE]
|     |         |
|     |         +-- Package suffix (BE, BM, UBE, etc.)
|     +-- Function number (4001, 4017, 4051, etc.)
+-- CD = CMOS Digital prefix

Example Decoding

CD4017BE
|  |   ||
|  |   |+-- E = Economy grade
|  |   +-- B = Buffered output
|  +-- 4017 = Decade counter/divider function
+-- CD = CMOS Digital prefix

CD4001UBE
|  |   |||
|  |   ||+-- E = Economy grade
|  |   |+-- B = Buffered
|  |   +-- U = Unbuffered variant
|  +-- 4001 = Quad 2-input NOR gate
+-- CD = CMOS Digital prefix

Technology Families (74xx Series)

Original TTL Technologies

Family	Name	Speed	Power	Supply	Notes
(none)	Standard TTL	Slow	High	5V	Original, obsolete
L	Low-power TTL	Slow	Low	5V	Obsolete
S	Schottky TTL	Fast	High	5V	Obsolete
LS	Low-power Schottky	Fast	Low	5V	Still common
ALS	Advanced LS	Faster	Lower	5V	Improved LS
F	Fast TTL	Very Fast	Medium	5V	High-speed apps
AS	Advanced Schottky	Very Fast	High	5V	Maximum speed

CMOS Technologies (Modern)

Family	Name	Speed	Power	Supply	Notes
C	CMOS	Slow	Very Low	3-15V	Wide voltage range
HC	High-speed CMOS	Fast	Very Low	2-6V	Most common today
HCT	HC TTL-compatible	Fast	Very Low	4.5-5.5V	5V TTL I/O levels
AC	Advanced CMOS	Very Fast	Low	2-6V	High-speed CMOS
ACT	AC TTL-compatible	Very Fast	Low	4.5-5.5V	Fast + TTL levels
AHC	Advanced HC	Faster	Very Low	2-5.5V	Improved HC
AHCT	AHC TTL-compatible	Faster	Very Low	4.5-5.5V	Improved HCT

Low-Voltage Technologies

Family	Name	Speed	Supply	Notes
LV	Low Voltage	Medium	2-5.5V	General low-voltage
LVC	LV CMOS	Fast	1.65-5.5V	Common in 3.3V systems
LVT	LV TTL	Fast	2.7-3.6V	3.3V optimized
ALVC	Advanced LVC	Very Fast	1.65-3.6V	High-speed 3.3V
AUC	Advanced ULP	Fast	0.8-2.7V	Ultra-low voltage
AUP	Advanced ULP	Medium	0.8-3.6V	Ultra-low power

Technology Selection Guide

Use Case	Recommended Family
New 5V design	HC or HCT
Replacing old TTL	HCT (input compatible)
3.3V systems	LVC
Mixed 3.3V/5V	LVC (5V tolerant)
Low power battery	AUP, HC
High speed	AC, AHC, ALVC
Wide voltage range	CD4000 series

Function Number Reference

Gates (2-digit)

Number	Function	Gates/Package
00	Quad 2-input NAND	4
02	Quad 2-input NOR	4
04	Hex inverter	6
08	Quad 2-input AND	4
10	Triple 3-input NAND	3
11	Triple 3-input AND	3
20	Dual 4-input NAND	2
21	Dual 4-input AND	2
27	Triple 3-input NOR	3
30	8-input NAND	1
32	Quad 2-input OR	4
86	Quad 2-input XOR	4
125	Quad bus buffer (tri-state)	4
126	Quad bus buffer (tri-state)	4

Flip-Flops

Number	Function	Flip-Flops/Package
73	Dual J-K flip-flop (clear)	2
74	Dual D flip-flop (preset/clear)	2
75	Quad bistable latch	4
76	Dual J-K flip-flop (preset/clear)	2
109	Dual J-K flip-flop (positive edge)	2
112	Dual J-K flip-flop (negative edge)	2
174	Hex D flip-flop (common clear)	6
175	Quad D flip-flop (common clear)	4
273	Octal D flip-flop (common clear)	8
374	Octal D flip-flop (tri-state)	8
574	Octal D flip-flop (tri-state, edge)	8

Counters

Number	Function
90	Decade counter
93	4-bit binary counter
160	Sync decade counter (async clear)
161	Sync 4-bit counter (async clear)
163	Sync 4-bit counter (sync clear)
190	Sync decade up/down counter
191	Sync binary up/down counter
393	Dual 4-bit binary counter
4017	CD4017 decade counter/divider
4040	CD4040 12-bit binary counter

Shift Registers

Number	Function	Bits
164	8-bit serial-in parallel-out	8
165	8-bit parallel-in serial-out	8
166	8-bit parallel-in serial-out	8
595	8-bit serial-in parallel-out (latch)	8
597	8-bit serial-in parallel-out (latch)	8
4015	CD4015 dual 4-bit shift register	2x4
4094	CD4094 8-bit shift register	8

Decoders/Demultiplexers

Number	Function
42	BCD to decimal decoder
138	3-to-8 line decoder
139	Dual 2-to-4 line decoder
154	4-to-16 line decoder
155	Dual 2-to-4 decoder/demux
238	3-to-8 line decoder (active high)
4028	CD4028 BCD to decimal decoder
4514	CD4514 4-to-16 line decoder (latch)

Multiplexers

Number	Function
151	8-to-1 multiplexer
153	Dual 4-to-1 multiplexer
157	Quad 2-to-1 multiplexer
158	Quad 2-to-1 multiplexer (inverted)
251	8-to-1 multiplexer (tri-state)
253	Dual 4-to-1 multiplexer (tri-state)
257	Quad 2-to-1 multiplexer (tri-state)
4051	CD4051 8-channel analog mux
4052	CD4052 Dual 4-channel analog mux
4053	CD4053 Triple 2-channel analog mux

Buffers/Drivers

Number	Function
07	Hex buffer (open-collector)
17	Hex buffer (open-collector)
125	Quad buffer (tri-state)
126	Quad buffer (tri-state)
240	Octal buffer (inverting, tri-state)
241	Octal buffer (non-inverting, tri-state)
244	Octal buffer (non-inverting, tri-state)
245	Octal bus transceiver (tri-state)
4049	CD4049 Hex inverting buffer
4050	CD4050 Hex non-inverting buffer

Package Codes

74xx Series Package Codes

Code	Package	Pins	Notes
N	PDIP	14-20	Through-hole, prototyping
D	SOIC	14-20	Surface mount, 1.27mm pitch
DW	SOIC-Wide	16-28	Wide body SOIC
PW	TSSOP	14-24	Thin profile, 0.65mm pitch
DB	SSOP	14-28	Shrink SOIC
DBV	SOT-23	5-6	Very small, single gate
DGV	VSSOP	8	Mini SOIC
RGY	QFN	16-24	No-lead package
NS	SO	14-20	Small outline
M	SOIC	14-20	Alternative SOIC code
T	TSSOP	14-24	Alternative TSSOP code
P	DIP	14-20	Plastic DIP (alternate)

CD4xxx Series Package Codes

Code	Package	Notes
BE	PDIP	Standard plastic DIP, buffered
B	PDIP	Standard buffered output
E	PDIP	Economy grade
UBE	PDIP	Unbuffered output
BC	CERDIP	Ceramic DIP (high reliability)
BM	SOIC	Surface mount, buffered
BT	TSSOP	Thin package, buffered
BD	SOIC	Alternative SOIC code
PWR	TSSOP	Tape and reel
N	DIP	Generic DIP
P	DIP	Plastic DIP
NSR	SOIC	SOIC tape and reel

Handler Implementation

Supported Component Types

ComponentType.IC         // Base type
ComponentType.LOGIC_IC   // Specific logic IC type

Pattern Recognition

// 74xx series pattern (includes 54xx military)
"^(?:74|54)[LSAHCTTF]{0,4}[0-9]{2,4}.*"

// CD4xxx series pattern
"^CD4[0-9]{3}.*"

Series Extraction Rules

The handler extracts the base series by:

74xx: Extracts digits after technology code until non-digit
- ```
SN74HC595N
```
  ->
```
595
```
- ```
74LS04D
```
  ->
```
04
```
CD4xxx: Extracts
```
CD4
```
+ 3-digit function
- ```
CD4017BE
```
  ->
```
CD4017
```
- ```
CD4001UBE
```
  ->
```
CD4001
```

Package Code Extraction Rules

CD4xxx:

Check longest suffixes first:
```
UBE
```
,
```
BE
```
,
```
BC
```
Then shorter:
```
B
```
,
```
E
```

74xx:

Single letter suffix:
```
N
```
,
```
D
```
,
```
P
```
,
```
M
```
,
```
T
```
Pattern:
```
.*?([NDPMT])$
```

Similarity Calculation

The

LogicICSimilarityCalculator

uses these rules:

Same Function, Compatible Technology = HIGH (0.9)

// These are highly similar (same function)
"74LS00" vs "74HC00"    // 0.9 - Same NAND function
"74LS04" vs "74ALS04"   // 0.9 - Same inverter function
"CD4001BE" vs "CD4001BM" // 0.9 - Same NOR gate, different package

Different Functions = LOW (0.3)

// These have low similarity (different functions)
"74LS00" vs "74LS04"    // 0.3 - NAND vs Inverter
"74HC595" vs "74HC138"  // 0.3 - Shift register vs Decoder
"CD4017" vs "CD4001"    // 0.3 - Counter vs NOR gate

Compatible Technology Groups

These 74xx families are considered compatible:

```
LS
```
,
```
ALS
```
,
```
F
```
,
```
HC
```
,
```
HCT
```

Parts with the same function and compatible families score HIGH similarity.

Function Groups

Parts in the same function group may have increased similarity:

Group	Function Numbers
NAND	00, 10, 20, 30, 40
NOR	02, 12, 22, 32, 42
NOT	04, 14, 24, 34, 44
AND	08, 18, 28, 38, 48
OR	32, 42
Flip-Flops	73, 74, 75, 76, 77, 78
Multiplexers	151, 153, 157, 158
Decoders	138, 139, 154, 155

Example MPNs

Texas Instruments (SN prefix)

MPN	Description
SN74HC595N	8-bit shift register, HC CMOS, DIP
SN74LS04D	Hex inverter, LS TTL, SOIC
SN74AHC1G04DCKR	Single inverter, AHC, SC70, tape/reel
SN74LVC245APW	Octal bus transceiver, LVC, TSSOP
SN74HC138D	3-to-8 decoder, HC CMOS, SOIC

Nexperia (74 prefix without SN)

MPN	Description
74HC595D	8-bit shift register, HC, SOIC
74LVC1G04GW	Single inverter, LVC, SC70
74AHCT125D	Quad buffer, AHCT, SOIC
74HCT245D	Octal bus transceiver, HCT, SOIC

ON Semiconductor (MC74 prefix)

MPN	Description
MC74HC595ADG	8-bit shift register, HC, SOIC
MC74AC04DG	Hex inverter, AC, SOIC
MC74VHC1GT04DTT1G	Single inverter, VHC, SC70

CD4000 Series (Multi-source)

MPN	Description
CD4001BE	Quad 2-input NOR, buffered, DIP
CD4017BM	Decade counter, buffered, SOIC
CD4051BE	8-channel mux, buffered, DIP
CD4066BM	Quad bilateral switch, buffered, SOIC
CD4093BE	Quad Schmitt NAND, buffered, DIP

Multi-Sourcing Guide

Logic ICs are second-sourced by many manufacturers. These are direct replacements:

Function	TI	Nexperia	ON Semi	STMicro
74HC595	SN74HC595	74HC595	MC74HC595A	M74HC595
74LS04	SN74LS04	74LS04	MC74LS04A	-
74HC138	SN74HC138	74HC138	MC74HC138A	M74HC138
CD4001	CD4001B	HEF4001B	MC14001B	HCF4001
CD4017	CD4017B	HEF4017B	MC14017B	HCF4017

Note: Nexperia uses

HEF

prefix for CD4000 series (e.g.,

HEF4001BT

). STMicro uses

HCF

prefix (e.g.,

HCF4017BE

). ON Semiconductor uses

MC14

prefix (e.g.,

MC14001BCP

Related Files

Handler:
```
manufacturers/LogicICHandler.java
```

Similarity Calculator:

componentsimilaritycalculators/LogicICSimilarityCalculator.java

Component Types:

ComponentType.LOGIC_IC

ComponentType.LOGIC_IC_NEXPERIA

ComponentType.LOGIC_IC_DIODES

Similarity Skill:

.claude/skills/similarity-logic/SKILL.md

Learnings & Quirks

Handler Patterns

Pattern uses character class:
```
[LSAHCTTF]{0,4}
```
captures technology but has duplicates (TT). Works but could be cleaner.
54xx military parts: Pattern includes 54xx prefix for military temperature range variants. Same function as 74xx.
No manufacturer prefix required: Pattern matches both
```
SN74HC595
```
(TI) and
```
74HC595
```
(generic).

Series Extraction Gotcha

The
```
extractSeries()
```
method uses regex
```
replaceAll("([0-9]{2,4}).*$", "$1")
```
which captures the function number.
For
```
74LS04D
```
, this extracts
```
04
```
(correct).
For
```
74HC595N
```
, this extracts
```
595
```
(correct).
Note: Technology prefix (LS, HC) is NOT included in extracted series.

Package Code Order Matters

// CORRECT - Check longer suffixes first
if (mpn.endsWith("UBE")) return "UBE";  // 3 chars first
if (mpn.endsWith("BE")) return "BE";    // 2 chars second
if (mpn.endsWith("B")) return "B";      // 1 char last

// WRONG - Would never match UBE or BE
if (mpn.endsWith("E")) return "E";      // Matches first!

CD4000 Buffered vs Unbuffered

B suffix: Buffered output (higher drive, lower speed)
UB suffix: Unbuffered output (faster, lower drive)
Most modern designs use buffered versions.

74xx vs CD4000 Comparison

Aspect	74xx (CMOS)	CD4000
Supply Voltage	2-6V (HC)	3-15V
Speed	Faster	Slower
Power	Low	Very Low
Output Drive	Higher	Lower
ESD Tolerance	Lower	Higher
Noise Immunity	Good	Excellent

Technology Selection for Mixed Voltage

Source Logic	Target Logic	Use Family
5V TTL	3.3V CMOS	LVC (5V tolerant inputs)
3.3V CMOS	5V TTL	HCT (TTL output levels)
3.3V to 5V bidirectional	-	74LVC245 (transceiver)

Debug Statements in Calculator

The

LogicICSimilarityCalculator

contains

System.out.println

debug statements (lines 43, 47, 51, 59, 67, 78, 92, 113-123). These should be removed or replaced with SLF4J logging in production.

Cross-Handler Considerations

LogicICHandler handles generic logic ICs (74xx, CD4xxx).
Manufacturer-specific handlers (TI, Nexperia, etc.) may also match these parts.
Handler ordering in
```
ManufacturerHandlerFactory
```
affects which handler processes the part first.