SN74LS69D - Dual 4-Bit Counter, 16-Pin SOIC | Texas Instruments
料号： SN74LS69D ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： SN74LS69D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
[DATA_NEEDED: verified same-brand drop-in alternative MPN]
✅ 直接替换📋 参考替代料（不在目录中）
[DATA_NEEDED: verified cross-brand drop-in alternative MPN]
✅ 直接替换📋 参考替代料（不在目录中）
[DATA_NEEDED: verified drop-in alternative MPN]
✅ 直接替换📋 参考替代料（不在目录中）
[DATA_NEEDED: verified drop-in alternative MPN]
✅ 直接替换📋 参考替代料（不在目录中）
[DATA_NEEDED: verified drop-in alternative MPN]
✅ 直接替换📋 参考替代料（不在目录中）
SN74LS69D 最大额定值与电气特性
| 功能 | 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 |
| 输出配置 | Binary counter outputs |
| Count Direction | Up direction |
| Triggering | Negative-edge triggered |
| 封装 | 16-pin SOIC, PDSO16 |
| 安装类型 | Surface mount |
| Manufacturer | Texas Instruments |
SN74LS69D 16-pin soic, pdso16 引脚配置指南
SN74LS69D（16-pin soic, pdso16 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： SN74LS69D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SN74LS69D 适用于 6 应用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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： SN74LS69D ——对比、设计指导和合规信息。
选型指南
关键差异点
- Dual independent 4-bit counting sections （对比 [DATA_NEEDED: verified drop-in alternative MPN])
- Legacy 5 V TTL compatibility （对比 [DATA_NEEDED: verified CMOS drop-in alternative MPN])
- Verified operation up to 25 MHz （对比 [DATA_NEEDED: verified drop-in alternative MPN])
设计说明
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.
合规信息
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.
