圖片僅供參考

SN74LS240NSR

Name: SN74LS240NSR
Rating: 4.7 (12 reviews)

IC BUFFER INVERT 5.25V 20SO

製造商
製造商。部分 #SN74LS240NSR
包 20-SOIC (0.209, 5.30mm Width)
資料表 SN74LS240NSR DataSheet
有現貨的6045

+BOM RFQ

100%原創；新

24小時準備發貨

365天保修

RFQ&；獲得更多折扣

規格

Supplier	Texas Instruments
Package	Tape & Reel (TR),Cut Tape (CT)
Series	74LS
ProductStatus	Active
LogicType	Buffer, Inverting
NumberofElements	2
NumberofBitsperElement	4
OutputType	3-State
Current-OutputHighLow	15mA, 24mA
Voltage-Supply	4.75V ~ 5.25V
OperatingTemperature	0°C ~ 70°C (TA)
MountingType	Surface Mount
Package/Case	20-SOIC (0.209, 5.30mm Width)

概述

Description

The SN74LS240NSR is an octal buffer/line driver with 3-state outputs from the TI 74LS TTL family. It contains two independent 4-bit buffers (A0–A3 to Y0–Y3 and A4–A7 to Y4–Y7) with separate output-enable controls. When the enables are active, data on the inputs appears at the outputs; when disabled, all outputs go high impedance, allowing multiple devices to share a common bus without contention. It runs from a 5 V supply (typical 4.75–5.25 V) and accepts TTL-level inputs. Each output can source/sink a modest current suitable for driving TTL/CMOS inputs, but not heavy loads. Common uses include buffering data between a microprocessor or FPGA and memory/peripherals, expanding fan-out, and isolating devices on a bus. The NSR suffix indicates a specific TI packaging/variant (e.g., surface-mount or other).

Features

Here are the key features of the SN74LS240NSR:
- 8-bit noninverting buffer/driver with 3-state (tri‑state) outputs
- Two 4-bit sections: A0–A3 → Y0–Y3 and A4–A7 → Y4–Y7
- Independent, active-low enable inputs (G1 and G2); outputs are High-Z when disabled
- TXL/LS TTL technology (Low-Power Schottky)
- Single 5V supply (typical range about 4.75V–5.25V)
- TTL-compatible inputs; suitable for bus buffering and sharing data/address lines
用途: buffering and isolating devices on a shared bus, allowing multiple devices to drive a common set of lines without interference.

Package

SOIC-14 (Small Outline Integrated Circuit) package, 14 pins (plastic, surface-mount).

Pinout

- Pin count: 20 pins (DIP-20 / SOIC-20 depending on package)
- Function: Octal buffer/line driver with 3-state outputs. It contains two 4-bit buffer sections (A0–A3 to Y0–Y3 and A4–A7 to Y4–Y7) with independent output-enable controls, allowing the eight outputs to be placed in high-impedance for bus sharing.

Manufacturer

- Manufacturer: Texas Instruments (TI).
- What kind of company: A multinational American technology company that designs and manufactures semiconductors and related ICs (analog and digital), and is one of the world’s largest semiconductor firms.

Application

SN74LS240NSR is an octal buffer/line driver with 3-state outputs (two 4-bit buffers). Applications include:
- CPU/memory and I/O bus interfacing
- Buffering and isolating devices to reduce fan-out/load
- Interfacing TTL/CMOS domains
- Data path multiplexing/demultiplexing
- General-purpose 8-bit buffering with tri-state control.

Equivalent

Functional equivalents are other vendors’ octal buffer/driver with 3-state outputs in the 74LS family, e.g. 74LS240N from NXP/Nexperia, ON Semiconductor, Toshiba, Renesas, etc. Also a CMOS-style alternative is the 74ACT240 (not drop-in due to different voltage thresholds). Check pinout and packaging when substituting.