SN74ACT373-EP - Octal D-Type Transparent Latch | Texas Instruments
部品番号: SN74ACT373-EP ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.98 | $98.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
SN74ACT373-EP 概要
An octal D-type transparent latch is a digital logic component that captures the state of eight data inputs (1D-8D) when the latch-enable (LE) input is high, and holds that state when LE is low. The 3-state outputs allow multiple devices to share a common bus, as each output can be disabled (high-impedance) to avoid contention. This device is part of the ACT family, which combines advanced CMOS technology with TTL-compatible inputs, offering high speed and low power consumption.
Key features include a maximum propagation delay (tpd) of 5V, 3-state outputs for bus driving, and compatibility with TTL voltage levels. The Enhanced Product designation indicates extended temperature range and reliability for demanding applications. The device is available in multiple package options, including SOIC, SSOP, TSSOP, and PDIP, providing design flexibility.
Technically, the SN74ACT373-EP uses a CMOS process that provides balanced propagation delays and high noise immunity. The 3-state outputs are controlled by the OE input, which when low, enables the outputs; when high, places them in high-impedance state. This allows the latch to drive bus lines directly, reducing the need for external buffers. The device also features a latch-enable (LE) input that is level-sensitive, making it transparent when high and latched when low.
Typical applications include address latching in microprocessor systems, data buffering in memory interfaces, and general-purpose I/O expansion. The high drive capability and 3-state outputs make it ideal for bus-oriented designs where multiple peripherals share a common data bus. The wide operating temperature range of -40°C to 125°C (Enhanced Product) ensures reliable operation in industrial and automotive environments.
When designing with this device, ensure that the OE and LE inputs are properly driven to avoid bus contention. The high-impedance state should be used to prevent multiple outputs from driving the same bus simultaneously. Additionally, consider the propagation delay and setup/hold times to meet system timing requirements.
ドロップイン代替品: SN74ACT373-EP — 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:
SN74ACT373
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SN74ACT373-EP
✅ ドロップイン✓ 在庫あり
$0.75 / 個
データシートを見る →MC74ACT373
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
74ACT373SCX
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
CD74ACT373
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
SN74ACT373-EP 最大定格＆電気的特性
| Technology Family | ACT |
| Number of Channels | 8 |
| 出力タイプ | 3-State |
| Input Type | TTL-Compatible |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Maximum Propagation Delay (tpd) | 5 V (typical) |
| 動作温度範囲 | -40°C to 125°C |
| Package Type | SOIC-20, SSOP-20, TSSOP-20, PDIP-20 |
| 実装タイプ | Surface Mount or Through Hole |
| RoHS ステータス | Compliant |
| Lead-Free | Yes |
| Number of Bits | 8 |
| Latch Type | Transparent |
SN74ACT373-EP ピン構成
| ピン 1 | OE — Output enable (active low) |
| ピン 2 | 1Q — Output 1 |
| ピン 3 | 1D — Data input 1 |
| ピン 4 | 2D — Data input 2 |
| ピン 5 | 2Q — Output 2 |
| ピン 6 | 3Q — Output 3 |
| ピン 7 | 3D — Data input 3 |
| ピン 8 | 4D — Data input 4 |
| ピン 9 | 4Q — Output 4 |
| ピン 10 | GND — Ground |
| ピン 11 | LE — Latch enable |
| ピン 12 | 5Q — Output 5 |
| ピン 13 | 5D — Data input 5 |
| ピン 14 | 6D — Data input 6 |
| ピン 15 | 6Q — Output 6 |
| ピン 16 | 7Q — Output 7 |
| ピン 17 | 7D — Data input 7 |
| ピン 18 | 8D — Data input 8 |
| ピン 19 | 8Q — Output 8 |
| ピン 20 | VCC — Power supply |
主な用途
SN74ACT373-EP の用途: 6 件s: Address Latching in Microprocessor Systems, Data Buffering in Memory Interfaces, General-Purpose I/O Expansion, Bus-Oriented Systems, Industrial Control Systems, Automotive Electronics.
Address Latching in Microprocessor Systems
The SN74ACT373-EP is used to latch address lines in microprocessor systems, providing stable addresses during bus cycles. Its 3-state outputs allow multiple devices to share the address bus without contention. The high drive capability ensures reliable operation with capacitive loads. The wide temperature range makes it suitable for industrial controllers.
おすすめ
Data Buffering in Memory Interfaces
In memory systems, the SN74ACT373-EP buffers data lines between the memory and the controller. Its 3-state outputs enable bus sharing, and the transparent latch mode allows data to pass through when LE is high. The TTL-compatible inputs simplify interfacing with legacy memory devices. The device's high drive current supports long trace lengths.
おすすめ
General-Purpose I/O Expansion
The SN74ACT373-EP can be used to expand the number of I/O lines in a system. By latching data from a microcontroller, it provides additional output lines that can drive LEDs, relays, or other peripherals. The 3-state outputs allow multiple latches to share a common bus, enabling scalable I/O expansion. Its low power consumption is ideal for portable devices.
おすすめ
Bus-Oriented Systems
The SN74ACT373-EP is designed for bus-organized systems where multiple devices share a common data bus. Its 3-state outputs can be placed in high-impedance state to avoid bus contention. The buffered OE input allows easy control of output enable. The device's high drive capability eliminates the need for external pullup resistors, simplifying the bus interface.
おすすめ
Industrial Control Systems
In industrial control systems, the SN74ACT373-EP provides reliable latching and buffering of control signals. Its extended temperature range (-40°C to 125°C) ensures operation in harsh environments. The device's high noise immunity and TTL compatibility make it suitable for interfacing with sensors and actuators. The 3-state outputs allow multiplexing of multiple control lines.
おすすめ
Automotive Electronics
The SN74ACT373-EP is suitable for automotive electronics due to its Enhanced Product rating and wide temperature range. It can be used for latching sensor data, controlling actuators, or buffering communication lines. The device's robustness and reliability meet automotive standards. Its 3-state outputs are useful for multiplexing signals in body control modules.
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: SN74ACT373-EP — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SN74ACT373 | MC74ACT373 | 74ACT373SCX |
|---|---|---|---|---|
| Package | SOIC-20, SSOP-20, TSSOP-20, PDIP-20 | SOIC-20, SSOP-20, TSSOP-20, PDIP-20 | SOIC-20, TSSOP-20 | SOIC-20 |
| Brand | Texas Instruments | Texas Instruments | onsemi | onsemi |
| Supply Voltage Range | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V |
| Output Type | 3-State | 3-State | 3-State | 3-State |
| Number of Bits | 8 | 8 | 8 | 8 |
| Operating Temperature Range | -40°C to 125°C | 0°C to 70°C | -40°C to 85°C | -40°C to 85°C |
| Propagation Delay (tpd) | 5V (typical) | 5V (typical) | 5V (typical) | 5V (typical) |
| RoHS Compliant | Yes | Yes | Yes | Yes |
主な差別化要因
- Enhanced Product rating for extended temperature range （vs SN74ACT373)
- Wide package availability （vs 74ACT373SCX)
- TTL-compatible inputs （vs MC74ACT373)
設計ノート
The SN74ACT373-EP operates from a 4.5V to 5.5V supply. Ensure adequate decoupling capacitors (0.1uF and 10uF) are placed close to the VCC pin to minimize power supply noise. The device's quiescent current is low, but dynamic switching currents can cause voltage dips; use a solid ground plane to reduce inductance.
For high-speed bus applications, keep traces short and matched in length to minimize skew. The 3-state outputs can drive capacitive loads, but excessive capacitance can increase propagation delay. Use series termination resistors (33-ohm) if the trace length exceeds 2 inches to reduce reflections.
Ensure the OE input is not left floating; tie it to GND to enable outputs or to VCC to disable them. The LE input should be driven with a clean signal to avoid unintended latching. When multiple devices share a bus, only one should have its outputs enabled at a time to prevent bus contention.
コンプライアンス情報
RoHS compliant per TI product page. Enhanced Product rating for extended temperature range.
