SN74LS68N - 4-Bit Parallel Binary Accumulator | Texas Instruments
部品番号: SN74LS68N ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.5606 | $0.56 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
SN74LS68N 概要
A parallel binary accumulator is a synchronous counting-logic IC that adds an external addend value to an internal register during an active clock transition. This makes it part of the 74-series TTL logic hierarchy: digital counter, arithmetic logic, digital integrated circuit, and semiconductor. Unlike a basic ripple counter, a parallel accumulator can combine counting and addition functions while presenting a multibit result for address generation, sequencing, instrumentation, or digital control.
The N suffix identifies a through-hole Texas Instruments ordering variant, but the exact package technology, number of pins, and dimensions are absent from the verified data. Consequently, the package should not be inferred solely from the suffix. Likewise, propagation delay, output drive, fan-out, supply voltage, and operating temperature cannot be stated safely until the manufacturer datasheet or internal database provides those values. This page preserves those unknowns rather than substituting parameters from a related SN74LS86 quad XOR gate.
Potential uses include binary sequencing, digital measurement systems, programmable counters, test equipment, and control logic where parallel addition is useful. Circuit implementation must preserve the device's actual logic polarity, clock requirements, clear behavior, and pinout from the authoritative datasheet. Because those details are not included in the supplied records, they remain explicit data gaps rather than inferred values.
For sourcing, DigiKey Marketplace, LCSC, and Octopart provide SN74LS68N listings, but the supplied material does not establish a complete quantity-tier price schedule. LCSC explicitly reports an in-stock status and a starting price of $0.5606. Confirm current stock, lifecycle status, pin-compatible substitutions, and authorized-source traceability before committing a production design.
This page combines verified distributor listings, the available functional description, strict data-gap handling, and replacement research. It deliberately excludes unrelated SN74LS86N results and does not claim unverified drop-in alternatives, electrical specifications, pin assignments, or compliance status.
ドロップイン代替品: SN74LS68N — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストSN74LS68N 最大定格＆電気的特性
| Manufacturer | Texas Instruments |
| Product Type | Counter IC |
| Functional Description | 4-bit parallel binary accumulator |
| Logic Family | 74LS series TTL logic |
| Logic Element Width | 4 bit |
| Accumulator Architecture | Parallel binary |
| Verified Starting Price | $0.5606 as of 2026-10-22 |
| Verified Stock Status | In stock at LCSC as of 2026-10-22 |
SN74LS68N standard ピン配置ガイド
SN74LS68N (standard パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: SN74LS68N.
詳細は データシート をご参照ください。
主な用途
SN74LS68N の用途: 6 件s: Legacy Digital Sequencing, Digital Measurement Systems, Binary Address Generation, Industrial Control Logic, Test and Measurement Equipment, Educational TTL Logic Systems.
Legacy Digital Sequencing
SN74LS68N can fit legacy sequencing systems that specifically require the verified 4-bit parallel binary accumulator function rather than a simple modulo counter. Its accumulator behavior can represent a state value, add an externally supplied quantity, and expose a multibit result for the next control stage. This makes it potentially useful in laboratory instruments and older control equipment, provided the exact clock, addend, carry, clear, and output behavior is confirmed from the authoritative datasheet. The supplied evidence does not establish timing or package limits, so engineers must not use it in new high-speed sequencing without an electrical and pin-level review.
おすすめ
Digital Measurement Systems
A 4-bit parallel accumulator can support event counting and small arithmetic operations in digital measurement equipment. SN74LS68N may be considered when a legacy TTL subsystem must retain parallel addend and accumulated-count behavior, such as a low-channel event counter followed by display or latch logic. The part's verified classification supports counter use, but the available records do not state maximum clock frequency, ripple characteristics, or output timing. A design should therefore budget external synchronization and confirm all timing paths against the exact Texas Instruments datasheet before assigning measurement accuracy or throughput.
おすすめ
Binary Address Generation
SN74LS68N may be evaluated for repeatable binary address or sequencing generation when a legacy design needs counting combined with parallel arithmetic. A 4-bit accumulator can hold a base value and incorporate an offset before presenting the next state, which is useful for compact control tables or stepped sequencing networks. The available verified data does not identify output polarity, propagation delay, or package pinout, so the implementation cannot yet be placed safely in a schematic. Confirm the authoritative TI pinout and timing, and ensure downstream address devices meet 74LS output-loading requirements.
おすすめ
Industrial Control Logic
SN74LS68N can be considered in an industrial or institutional control module when maintaining legacy 74LS logic is necessary and the required function is exactly a 4-bit parallel binary accumulator. It may combine count and addition functions without requiring a microprocessor for a small fixed sequence. However, the supplied sources do not verify operating temperature, supply range, noise margins, ESD performance, or lifecycle status. Production use therefore requires review of the exact manufacturer environmental and electrical specifications, plus qualification for the enclosure, temperature, vibration, and availability conditions of the target machine.
おすすめ
Test and Measurement Equipment
The accumulator function can assist small test systems that need to index measurement states or add a parallel correction value between stimuli and results. SN74LS68N may preserve the logic architecture of older bench instruments, avoiding a complete redesign when only a compact binary sequence or arithmetic update is required. Its suitability is conditional because the verified material supplies no frequency limit, settling behavior, output loading, or timing specification. Engineers should first confirm those details in the exact TI documentation, then validate cumulative timing across every combinational and sequential stage in the fixture.
おすすめ
Educational TTL Logic Systems
SN74LS68N is suitable for study of parallel binary accumulation in a TTL teaching board if the instructor uses the exact manufacturer pinout and timing data. It can demonstrate how an addend is combined with stored state and why legacy synchronous logic behavior differs from software counters. Because the supplied records omit supply voltage, fan-out, and package dimensions, laboratory work should begin with the authoritative datasheet and current 74-series safe-practice guidance. Students and instructors should also distinguish this accumulator from XOR, comparator, and ordinary counter ICs that appear in related search results.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SN74LS68N — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
主な差別化要因
- Verified arithmetic function rather than generic counting classification （vs SN74LS86N)
- Exact Texas Instruments orderable MPN （vs Unspecified generic TTL accumulator)
- Current sourcing evidence （vs Unverified replacement candidates)
設計ノート
Do not use SN74LS86N pinouts, timing, or datasheets as a substitute for SN74LS68N documentation. The verified records identify SN74LS68N as a 4-bit parallel binary accumulator, while the supplied SN74LS86N pages describe a quad 2-input XOR gate. Obtain the exact TI document for SN74LS68N and cross-check part-number suffixes because a mechanically similar package does not establish logic compatibility.
Design timing cannot be closed until propagation delay, clock-edge behavior, carry timing, and output loading are verified. Before release, build a timing budget from the authoritative datasheet and include setup, hold, skew, and PCB variation across every path feeding the accumulator. Do not estimate switching limits from the broad 74LS family name or from the separate SN74LS86 records, since neither result supplies the required SN74LS68N timing values.
Capture schematic and layout only after the exact package, pin count, and pin names are confirmed. Keep clock and logic-routing topology consistent with the verified datasheet, provide a stable return path, and place any required decoupling according to the authoritative application guidance. Because the package dimensions and pin diagram are absent from the supplied data, no land pattern or recommended trace spacing can responsibly be generated here.
コンプライアンス情報
The supplied distributor and search-result snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from the 74LS family or Texas Instruments branding.
