SN74LS69D - Dual 4-Bit Counter, 16-Pin SOIC | Texas Instruments
部品番号: SN74LS69D ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.6606 | $0.66 |
| 10 | $0.6606 | $6.61 |
| 100 | $0.6606 | $66.06 |
| 500 | $0.6606 | $330.30 |
| 1,000 | $0.6606 | $660.60 |
SN74LS69D 概要
A binary counter is a synchronous sequential-logic device that stores and advances a multi-bit count. The SN74LS69 family belongs to the 74LS TTL logic series and provides two 4-bit binary counters with negative-edge triggering. Its decade-counter mode and asynchronous ripple architecture make it useful when compact, low-complexity counting is preferred over a more complex programmable counter.
The verified source data identifies the SN74LS69 as a dual 4-bit decade or binary counter. The SN74LS69D ordering code uses the SOIC-16 package. Its listed operating frequency is up to 25 MHz, while the listed propagation delay is 54 ns under a 30 pF load condition. The specified supply-voltage range is 4.75 V to 5.25 V.
Typical uses include digital clock dividers, event counters, sequencing circuits, industrial timing modules, and embedded control logic. Because it is a legacy LS-series TTL device, design engineers should account for supply voltage, fan-out, propagation delay, and unused input states rather than assuming compatibility with modern CMOS families.
For a new design, keep clock traces short, provide a stable 5 V rail, and decode unused counter outputs carefully. Ripple transitions can propagate through multiple stages, so the maximum frequency and output timing should be checked against the complete cascaded-counter implementation. Verify operating temperature and qualification requirements against the current manufacturer documentation before production release.
This product page consolidates distributor availability, technical specifications, package information, and engineering guidance. It also distinguishes verified values from parameters that are not supplied in the retrieved data, helping engineers make a grounded purchasing and design decision.
ドロップイン代替品: SN74LS69D — 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。
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[DATA_NEEDED: verified drop-in alternative MPN]
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SN74LS69D 最大定格＆電気的特性
| 機能 | Dual 4-bit decade or binary counter |
| Counter Architecture | Asynchronous, negative-edge triggered |
| Number of Counters | 2 counters |
| Counter Width | 4 bits per counter |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Maximum Operating Frequency | 25 MHz |
| Propagation Delay | 54 ns |
| Load Capacitance | 30 pF |
| Logic Family | 74LS TTL |
| Logic Type | TTL logic counter IC |
| 出力構成 | Binary counter outputs |
| Count Direction | Up direction |
| Triggering | Negative-edge triggered |
| パッケージ | 16-pin SOIC, PDSO16 |
| 実装タイプ | Surface mount |
| Manufacturer | Texas Instruments |
SN74LS69D 16-pin soic, pdso16 ピン配置ガイド
SN74LS69D (16-pin soic, pdso16 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: SN74LS69D.
詳細は データシート をご参照ください。
主な用途
SN74LS69D の用途: 6 件s: Digital Frequency Divider, Industrial Event Counter, Digital Clock and Timer, Sequencing and Control Logic, Pulse and Retriggerable-Timing Logic, Legacy TTL Test Fixture.
Digital Frequency Divider
The SN74LS69D fits digital frequency-divider designs because it provides a 4-bit asynchronous binary counter with operation verified up to 25 MHz and a stated 54 ns propagation delay at 30 pF. Each counter section can count clock transitions and expose decoded states for divide-by-2, divide-by-4, divide-by-8, and divide-by-16 functions, depending on the selected output. For a new board, route the clock directly to the count input and keep decoded output traces short to limit additional delay. The verified 4.75 V to 5.25 V supply range makes it appropriate for legacy 5 V TTL logic, but the final divider ratio and maximum input frequency must be checked against the complete timing chain.
おすすめ
Industrial Event Counter
The SN74LS69D can serve as a compact event-counting block in an industrial control module when the input event frequency remains within the verified 25 MHz device capability and the module uses a 5 V TTL environment. Its dual 4-bit counter organization allows two independent event streams or a longer count formed from cascade stages. The negative-edge-triggered behavior should be matched to the sensor or pulse-conditioning circuit so the intended edge is counted only once. Because ripple-counter transitions can accumulate through cascaded sections, verify settling time, output decoding, and reset behavior in the actual control enclosure before using it as a safety or production-counter function.
おすすめ
Digital Clock and Timer
A digital clock or timer subsystem can use the SN74LS69D when a compact asynchronous binary count sequence is preferable to a software timer. The device supports two 4-bit counting sections, negative-edge triggering, and a verified maximum operating frequency of 25 MHz, allowing clock-derived time bases to be divided or decoded locally. Keep the 5 V supply stable and observe the listed 54 ns propagation delay when generating control signals from decoded outputs. The supplied data does not include oscillator-startup, accuracy, or temperature-limit specifications, so this part should not be assumed suitable for a precision real-time clock without separate oscillator and calibration design.
おすすめ
Sequencing and Control Logic
The SN74LS69D is useful for repeatable sequencing and modulo-counting functions in legacy control logic. A 4-bit counter state can be decoded into discrete control phases, such as step enables, timing windows, or actuator commands, while the second counter section can operate independently or extend the sequence through cascading. The verified 4.75 V to 5.25 V operating range and 16-pin SOIC package fit 5 V TTL boards, but the design must account for negative-edge triggering and reset polarity. Use the manufacturer pinout and timing data during schematic capture; the supplied search results identify the function and package but do not provide the complete pin assignments.
おすすめ
Pulse and Retriggerable-Timing Logic
The SN74LS69D can participate in pulse-counting and retriggerable-timing circuits when an external preset or reset signal establishes the timing window and a 4-bit count records elapsed events. Its verified 54 ns propagation delay provides a useful timing reference for short digital paths, while the dual-counter arrangement can support two related time bases. The device does not replace a one-shot or monostable function by itself; those functions must be implemented with additional logic or a timer IC. Validate pulse width, reset recovery, and output timing at the target clock because those parameters are not included in the verified data supplied here.
おすすめ
Legacy TTL Test Fixture
The SN74LS69D is appropriate for a legacy 5 V TTL test fixture that needs repeatable binary counting or clock-state observation without a programmable counter. The 16-pin SOIC package supports conventional surface-mount board assembly, and the verified 4.75 V to 5.25 V supply range is compatible with regulated 5 V fixture rails. Bring out selected counter outputs to test points, keep clock lines short, and include a known-good reset path so each measurement begins from a defined state. Since the supplied data does not state operating temperature, absolute-maximum ratings, or detailed output-current limits, add those checks to the fixture’s component approval process.
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: SN74LS69D — 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
- Dual independent 4-bit counting sections （vs [DATA_NEEDED: verified drop-in alternative MPN])
- Legacy 5 V TTL compatibility （vs [DATA_NEEDED: verified CMOS drop-in alternative MPN])
- Verified operation up to 25 MHz （vs [DATA_NEEDED: verified drop-in alternative MPN])
設計ノート
Use the verified 54 ns propagation delay at 30 pF as a design reference, not as a complete timing guarantee. If multiple SN74LS69D sections are cascaded, add the delay of each ripple stage and the settling time required by the decoding logic. Keep clock and output traces short, avoid unnecessary capacitive loading, and simulate or measure the worst-case state transition before setting the maximum clock frequency.
Power the device from a regulated 5 V rail within the verified 4.75 V to 5.25 V supply range. Place the usual local supply decoupling close to the IC and route return current through a low-impedance ground plane. Because the supplied data does not include output-current limits or absolute-maximum ratings, verify those values in the manufacturer datasheet before driving heavily loaded TTL outputs or external backplanes.
The PDSO16 package is a surface-mount 16-pin SOIC footprint, but the supplied results do not include the complete pin diagram or land pattern. Confirm pin numbering, exposed-pad details if any, and manufacturer recommended layout before placing the part. Preserve access to all counter outputs and route the clock away from sensitive analog or high-current switching nodes to reduce unwanted coupling.
Do not substitute a generic 4-bit counter solely by matching the counter width. A valid replacement must also match the negative-edge triggering convention, decade or binary mode requirements, supply range, 16-pin SOIC pinout, and timing behavior. The supplied cross-reference results did not identify a verified alternate MPN, so obtain the manufacturer pinout and timing data before approving a substitute.
コンプライアンス情報
The supplied verified web data contains technical, package, availability, and pricing information but does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
