SN74LS17N - Hex Open-Collector Buffer Driver | Texas Instruments
Артикул: SN74LS17N ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
SN74LS17N Обзор
What is a buffer or logic driver? A buffer is a digital IC that reproduces a logic signal at a compatible voltage and current level, while a driver adds output-current capability for loads beyond ordinary logic-gate fanout. The SN74LS17N belongs to the 74LS low-power Schottky TTL logic family, which is part of the broader digital IC and logic-IC hierarchy. Its open-collector outputs can sink current from an external pull-up network, making it useful where a driven device must share a bus or where system shutdown must actively pull a line low.
Key features include six non-inverting channels, open-collector high-voltage outputs, input clamping diodes, and high sink-current capability. The verified product description specifically identifies the device as suitable for converting TTL voltage levels to MOS levels and driving indicator lamps and relays. Because the outputs are open collector, voltage rise time depends on the pull-up resistor, load capacitance, and the driven load rather than being determined only by the IC output stage. This makes resistor and capacitance selection important in time-sensitive systems.
The SN74LS17N uses a 14-pin through-hole DIP package, with a commercial-grade temperature range of 0°C to 70°C. The provided sources identify the function, package class, channel count, terminal count, open-collector output architecture, input clamping, and high sink-current capability. Detailed electrical limits such as supply voltage, output current, propagation delay, input and output voltage levels, and absolute maximum ratings were not included in the supplied verified excerpts and are therefore marked for data retrieval rather than guessed.
Typical applications include TTL-to-MOS level conversion, relay-driver circuits, indicator-lamp interfaces, alarm and status signaling, and digital control lines requiring active-low open-collector behavior. An external pull-up resistor must be selected so that its sink current remains within the SN74LS17N output specification and so that the resulting RC rise time meets the receiving circuit's timing requirements. Multiple open-collector outputs can be connected to a common pull-up for wired logic, provided the aggregate sink-current limit is respected.
When designing a replacement board, preserve the 14-pin DIP pinout and account for open-collector output behavior. Do not assume a push-pull output can be substituted without reviewing the pull-up network and downstream load. Verify the external pull-up voltage, relay-coil current, logic thresholds, temperature requirements, and timing budget against the complete manufacturer datasheet before production release.
Аналоги без доработки для SN74LS17N — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
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SN74LS17N
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Открыть даташит →SN74LS17N Максимальные параметры и электрические характеристики
| Product Type | Hex buffer/driver with open-collector high-voltage outputs |
| Logic Family | 74LS low-power Schottky TTL |
| Number of Channels | 6 |
| Выходная конфигурация | Open collector |
| Logic Polarity | Non-inverting |
| Input Clamping Diodes | Present |
| Output Interface | Open-collector; external pull-up required |
| MOS Level Conversion | Suited for TTL-to-MOS level conversion |
| Indicator and Relay Drive | Designed for indicator lamps and relays |
| Корпус | 14-pin DIP |
| Terminal Count | 14 terminals |
| Тип монтажа | Through-hole |
| Диапазон рабочих температур | 0°C to 70°C |
| Datasheet Page Count | 11 pages |
| Datasheet File Size | 327 Kbytes |
| Manufacturer | Texas Instruments |
| Статус жизненного цикла | Not stated in the provided verified excerpts |
Руководство по цоколевке SN74LS17N в корпусе 14-pin dip
Цоколевка для SN74LS17N (корпус 14-pin dip). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для SN74LS17N.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
SN74LS17N подходит для 6 применениеs: TTL-to-MOS Level Conversion, Relay Driver Interface, Indicator Lamp Control, Wired-AND Status Bus, Digital Shutdown and Fault Signaling, Legacy TTL Control Panel.
TTL-to-MOS Level Conversion
The SN74LS17N fits TTL-to-MOS interfaces because the verified Texas Instruments description identifies conversion from TTL voltage levels to MOS levels as a supported use. Each open-collector channel sinks the current required by the MOS-side input while an external pull-up establishes the MOS input high voltage. The engineer must select the pull-up rail and resistor so the high level, sink current, and RC rise time satisfy the MOS device requirements. Since the supplied excerpts do not specify the SN74LS17N output-current limits or propagation timing, both should be verified in the complete datasheet before high-speed or heavily loaded designs.
Рекомендуется
Relay Driver Interface
The SN74LS17N is appropriate for relay-control interfaces because its verified description explicitly names relays and its open-collector outputs provide a controlled sink path. Connect the output to the relay-control node and use an external pull-up to the intended coil-supply voltage. Confirm that coil current is below the output sink rating, and place a flyback diode across an inductive relay coil when required. The pull-up resistor also controls current and rise time, so the design should be checked against both the relay coil resistance and the device's published electrical limits rather than estimated from the package name.
Рекомендуется
Indicator Lamp Control
The verified product description identifies indicator lamps as a target application for the SN74LS17N. An open-collector output can sink lamp current from a pull-up rail, allowing the driver to operate lamps without actively sourcing the high-side current. Select a pull-up voltage compatible with the lamp and output ratings, and verify the steady-state sink current and thermal behavior. For lamps with significant inrush or long wiring, add appropriate current limiting and protection. The supplied data does not include numeric output-current limits, so those values must be obtained from the full manufacturer datasheet before final component selection.
Рекомендуется
Wired-AND Status Bus
The SN74LS17N's open-collector outputs can support a wired-AND status arrangement when multiple channels or devices pull a common node low. The shared pull-up supplies the high state, while any enabled output can create the low state. This arrangement is useful for fault, alarm, or shutdown-acknowledge signals because a wired logic can provide a fail-safe low indication when any driver asserts. The design must verify aggregate sink current, pull-up resistance, bus capacitance, and the receiving device's input thresholds. Numeric timing and current values are not present in the supplied excerpts and must be checked before using the bus at high speed.
Рекомендуется
Digital Shutdown and Fault Signaling
The SN74LS17N can provide an active-low control or fault signal when a system uses open-collector signaling. Its non-inverting inputs preserve the intended logic request, while the pull-up-defined high level allows multiple contributors to share the node without push-pull contention. This is useful for reset, inhibit, alarm, and power-sequencing signals where a default high state is acceptable. The external pull-up must be sized against the input leakage and cable capacitance of the receiving circuit. Because the verified excerpts do not provide input leakage, propagation delay, or output-current tables, use the complete datasheet to establish timing margin and system compatibility.
Рекомендуется
Legacy TTL Control Panel
The SN74LS17N is suitable for legacy TTL control panels where open-collector outputs need to bridge a logic signal to lamps, relays, or MOS-compatible inputs. Its 74LS family identity and six-channel organization simplify use in systems that already employ through-hole TTL logic. The DIP package also makes it practical for repair and prototyping boards where socketed parts are common. The pull-up network must be designed for the actual cable length and load, while unused channels should be handled according to the complete datasheet recommendations. Since the provided excerpts do not confirm a current authorized lifecycle or exact pinout, verify sourcing and documentation before production use.
Рекомендуется
Справочные инженерные данные для SN74LS17N — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SN74LS17N | SN74LS07D |
|---|---|---|---|
| Package | 14-pin DIP | 14-pin DIP | SOIC-14; not a same-package drop-in for the target |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Mounting Type | Through-hole | Through-hole | Surface-mount SOIC-14 |
Ключевые отличия
- Open-collector output architecture (против SN74LS07D)
- TTL-to-MOS conversion use (против SN74LS07D)
- Commercial 14-pin DIP implementation (против SN74LS07D)
Заметки по проектированию
Do not treat an open-collector output as a push-pull output. The SN74LS17N requires an external pull-up resistor, and the resistor determines the high-state voltage and rise time. Before connecting a relay, lamp, or MOS input, verify the pull-up voltage, load current, aggregate sink current, and the receiving device's input thresholds against the complete manufacturer datasheet. The supplied excerpts do not include numeric current limits, so they cannot be used to finalize those values.
For the 14-pin through-hole implementation, preserve the verified package and pin orientation and route the pull-up resistor close to the driven output or shared bus node. Keep relay-coil and lamp wiring away from sensitive logic where practical, and provide a flyback diode across inductive loads when required. The verified excerpts do not include the complete pinout, so the physical layout must be checked against the authoritative datasheet before fabrication.
Calculate the open-collector output rise time from the external pull-up resistance and total bus capacitance rather than assuming a datasheet propagation delay alone. Long wiring, relay wiring, and multiple connected outputs increase capacitance and leakage. The provided records contain no numeric timing or capacitance limits, so use manufacturer characteristic data and application timing margins before using the SN74LS17N in a high-speed interface.
Информация о соответствии
The supplied excerpts identify the manufacturer and commercial temperature range but do not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. AEC-Q100 is not applicable to the stated commercial 0°C to 70°C listing based on the available evidence.
