SN74ACT373-EP - Octal D-Type Transparent Latch | Texas Instruments
MPN: SN74ACT373-EP ✓ AktifSN74ACT373-EP Genel Bakış
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.
Drop-in alternatifler için SN74ACT373-EP — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
SN74ACT373
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
SN74ACT373-EP
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →MC74ACT373
✅ Yerleştirme ⚠️ Onaylanmamış Özellikler📋 Katalogda Olmayan Referans Alternatifi
74ACT373SCX
✅ Yerleştirme ⚠️ Onaylanmamış Özellikler📋 Katalogda Olmayan Referans Alternatifi
CD74ACT373
✅ Yerleştirme ⚠️ Onaylanmamış Özellikler📋 Katalogda Olmayan Referans Alternatifi
SN74ACT373-EP Maksimum Değerlendirmeler & Elektriksel Özellikler
| Technology Family | ACT |
| Number of Channels | 8 |
| Çıkış Türü | 3-State |
| Input Type | TTL-Compatible |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Maximum Propagation Delay (tpd) | 5 V (typical) |
| İşletim Sıcaklığı Aralığı | -40°C to 125°C |
| Package Type | SOIC-20, SSOP-20, TSSOP-20, PDIP-20 |
| Montaj Türü | Surface Mount or Through Hole |
| RoHS Durumu | Compliant |
| Lead-Free | Yes |
| Number of Bits | 8 |
| Latch Type | Transparent |
SN74ACT373-EP Pin Yapısı
| Pin 1 | OE — Output enable (active low) |
| Pin 2 | 1Q — Output 1 |
| Pin 3 | 1D — Data input 1 |
| Pin 4 | 2D — Data input 2 |
| Pin 5 | 2Q — Output 2 |
| Pin 6 | 3Q — Output 3 |
| Pin 7 | 3D — Data input 3 |
| Pin 8 | 4D — Data input 4 |
| Pin 9 | 4Q — Output 4 |
| Pin 10 | GND — Ground |
| Pin 11 | LE — Latch enable |
| Pin 12 | 5Q — Output 5 |
| Pin 13 | 5D — Data input 5 |
| Pin 14 | 6D — Data input 6 |
| Pin 15 | 6Q — Output 6 |
| Pin 16 | 7Q — Output 7 |
| Pin 17 | 7D — Data input 7 |
| Pin 18 | 8D — Data input 8 |
| Pin 19 | 8Q — Output 8 |
| Pin 20 | VCC — Power supply |
Tipik Uygulamalar
SN74ACT373-EP için uygundur 6 uygulamas: 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.
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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.
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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.
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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.
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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.
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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.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: SN74ACT373-EP — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | 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 |
Ana Farklılayıcılar
- Enhanced Product rating for extended temperature range (karşılaştırma:SN74ACT373)
- Wide package availability (karşılaştırma:74ACT373SCX)
- TTL-compatible inputs (karşılaştırma:MC74ACT373)
Tasarım Notları
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.
Uyumluluk Bilgisi
RoHS compliant per TI product page. Enhanced Product rating for extended temperature range.
