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Product Overview
The SN74LS14D from Texas Instruments is a hex Schmitt-trigger inverter IC designed for high-speed logic applications. It features six independent inverters with hysteresis, providing clean output transitions even with slow or noisy input signals. Housed in a compact 14-SOIC package, it operates over a supply voltage range of 4.75V to 5.25V, making it ideal for 5V logic systems. The device offers improved noise immunity and is commonly used in waveform shaping, pulse conditioning, and interface circuits.
Detailed Technical Specifications
| Parameter |
Value |
| Supply Voltage (VCC) |
4.75V – 5.25V |
| Input Voltage (VI) |
0V – 5.25V |
| High-Level Output Current (IOH) |
-0.4 mA |
| Low-Level Output Current (IOL) |
8 mA |
| Propagation Delay (tPLH/tPHL) |
15 ns (typ) at 5V, 15 pF |
| Input Hysteresis (VT+ – VT-) |
0.8V (typ) |
| Operating Temperature |
0°C to 70°C |
| Package |
14-SOIC |
Key Features
- Six independent Schmitt-trigger inverters
- Hysteresis voltage: 0.8V typical at 5V
- High noise immunity
- Low power consumption: 22 mW per gate (typ)
- Standard 14-pin SOIC package
- Compatible with TTL and CMOS logic levels
- Output drive capability: 8 mA sink, 0.4 mA source
Target Applications
- Waveform shaping and pulse conditioning in 5G base station control logic
- Debouncing switches in automotive dashboard interfaces
- Oscillator circuits for industrial sensors
- Signal conditioning for PLC input modules
- Noise filtering in data communication lines
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產品概述
SN74LS14D 是德州儀器(TI)生產的六路施密特觸發反相器 IC,專為高速邏輯應用設計。它包含六個獨立的帶滯後特性的反相器,即使在輸入信號緩慢或帶噪聲時也能提供乾淨的輸出轉換。器件採用緊湊的 14-SOIC 封裝,工作電源電壓範圍為 4.75V 至 5.25V,非常適合 5V 邏輯系統。該器件具有增強的噪聲抑制能力,常用於波形整形、脈衝調理和接口電路。
詳細技術參數
| 參數 |
數值 |
| 電源電壓 (VCC) |
4.75V – 5.25V |
| 輸入電壓 (VI) |
0V – 5.25V |
| 高電平輸出電流 (IOH) |
-0.4 mA |
| 低電平輸出電流 (IOL) |
8 mA |
| 傳播延遲 (tPLH/tPHL) |
15 ns (典型值) 在 5V, 15 pF |
| 輸入滯後 (VT+ – VT-) |
0.8V (典型值) |
| 工作溫度 |
0°C 至 70°C |
| 封裝 |
14-SOIC |
核心特性
- 六個獨立的施密特觸發反相器
- 滯後電壓:5V 時典型值 0.8V
- 高噪聲抑制能力
- 低功耗:每個門典型值 22 mW
- 標準 14 引腳 SOIC 封裝
- 兼容 TTL 和 CMOS 邏輯電平
- 輸出驅動能力:8 mA 灌電流,0.4 mA 拉電流
典型應用場景
- 5G 基站控制邏輯中的波形整形和脈衝調理
- 汽車儀表盤接口中的按鍵去抖動
- 工業傳感器的振盪器電路
- PLC 輸入模塊的信號調理
- 數據通信線路的噪聲濾波
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