SN74LV240A - Octal Inverting Buffer/Driver 3-State | TI
MPN： SN74LV240A ✓ 啟用中SN74LV240A 概覽
An octal buffer/driver is a digital integrated circuit that provides eight independent buffering channels, each capable of driving a bus line with high current and low output impedance. The 3-state outputs allow the device to be disconnected from the bus (high-impedance state) when not active, enabling multiple devices to share the same bus without contention. This category sits within the logic IC family, specifically under buffers/drivers, which are essential for signal conditioning and bus isolation in digital systems.
Key features include a wide operating voltage range of 2 V to 5.5 V, low power consumption typical of LV CMOS technology, and high drive capability of 8 mA at 3.3 V. The device supports mixed-mode voltage operation on all ports, allowing interfacing between different voltage domains. It also features latch-up performance exceeding 250 mA per JESD 17 and robust ESD protection, ensuring reliability in harsh environments.
The SN74LV240A is fabricated using low-voltage CMOS technology, which provides a balance between speed and power dissipation. The 3-state outputs are controlled by an output-enable (OE) input, allowing the outputs to be placed in a high-impedance state for bus sharing. The inverting outputs provide signal inversion, which can simplify logic design in certain applications. The device is available in multiple package options, including SOIC, SSOP, and TSSOP, offering flexibility for various PCB layouts.
Typical applications include memory address drivers, clock drivers, bus-oriented receivers/transmitters, and general-purpose digital interfacing. The low drive current and low noise characteristics make it suitable for low-noise applications where signal integrity is critical. The wide voltage range allows operation in both 3.3-V and 5-V systems, making it a versatile choice for mixed-voltage designs.
When designing with the SN74LV240A, ensure proper decoupling capacitors are placed near the VCC and GND pins to minimize power supply noise. The OE pin should be tied to a defined logic level to avoid floating outputs, which can cause excessive power consumption or bus contention. Consider the propagation delay and output transition times when interfacing with high-speed buses to avoid timing violations.
直接替換替代品，適用於 SN74LV240A — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SN74LV240A （相同外形與佔位） — 差異在於 Output Type.
SN74LVC240A
✅ 直接替換✗ 缺貨
$0.22 / 單位
查看資料表 →SN74AHCT240A
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
SN74HCT240A
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
74LVT240A
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC74LVX240
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
SN74LV240A 最大額定值與電氣特性
| Technology Family | LV-A |
| Supply Voltage (VCC) | 2 V to 5.5 V |
| Output Drive Current | 8 mA at 3.3 V |
| Number of Channels | 8 |
| 輸出類型 | 3-State |
| Logic Function | Inverting Buffer/Driver |
| Input Type | CMOS |
| 輸出類型 | 3-State |
| 工作溫度範圍 | -40°C to 85°C |
| Package Type | SOIC-20, SSOP-20, TSSOP-20 |
| 安裝類型 | Surface Mount |
| Latch-Up Performance | Exceeds 250 mA per JESD 17 |
| RoHS 狀態 | Compliant |
SN74LV240A 腳位配置
| 腳位 1 | 1A0 — Input for channel 0 |
| 腳位 2 | 1Y0 — Inverted output for channel 0 |
| 腳位 3 | 1A1 — Input for channel 1 |
| 腳位 4 | 1Y1 — Inverted output for channel 1 |
| 腳位 5 | 1A2 — Input for channel 2 |
| 腳位 6 | 1Y2 — Inverted output for channel 2 |
| 腳位 7 | 1A3 — Input for channel 3 |
| 腳位 8 | 1Y3 — Inverted output for channel 3 |
| 腳位 9 | GND — Ground |
| 腳位 10 | 2A3 — Input for channel 7 |
| 腳位 11 | 2Y3 — Inverted output for channel 7 |
| 腳位 12 | 2A2 — Input for channel 6 |
| 腳位 13 | 2Y2 — Inverted output for channel 6 |
| 腳位 14 | 2A1 — Input for channel 5 |
| 腳位 15 | 2Y1 — Inverted output for channel 5 |
| 腳位 16 | 2A0 — Input for channel 4 |
| 腳位 17 | 2Y0 — Inverted output for channel 4 |
| 腳位 18 | 1OE — Output enable for channels 0-3 (active low) |
| 腳位 19 | 2OE — Output enable for channels 4-7 (active low) |
| 腳位 20 | VCC — Power supply |
典型應用
SN74LV240A 適用於 6 應用s: Memory Address Drivers, Clock Drivers, Bus-Oriented Receivers/Transmitters, General-Purpose Digital Interfacing, Low-Noise Signal Distribution, Test and Measurement Equipment.
Memory Address Drivers
The SN74LV240A is designed to improve performance and density of 3-state memory address drivers. Its 8 mA drive at 3.3 V ensures reliable driving of address lines in memory systems, while the 3-state outputs allow multiple memory banks to share the same bus. The low-drive CMOS design minimizes noise, which is critical for high-speed memory interfaces. The wide voltage range (2 V to 5.5 V) supports both 3.3-V and 5-V memory systems, making it a versatile choice for various memory architectures.
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Clock Drivers
The SN74LV240A can be used as a clock driver to buffer and distribute clock signals to multiple loads. Its 8 mA drive capability at 3.3 V ensures strong signal integrity, while the inverting outputs can be used to generate complementary clock signals. The 3-state outputs allow the clock line to be disabled when not needed, reducing power consumption. The low noise characteristics are beneficial for maintaining clock signal quality in sensitive applications.
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Bus-Oriented Receivers/Transmitters
The SN74LV240A is designed for bus-oriented receivers and transmitters, providing buffering and inversion for data buses. Its 3-state outputs enable multiple devices to share the same bus without contention, while the 8 mA drive ensures reliable signal transmission. The wide voltage range supports mixed-voltage bus systems, and the low-drive CMOS design reduces noise and power consumption. This makes it suitable for industrial control buses and data acquisition systems.
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General-Purpose Digital Interfacing
The SN74LV240A can be used for general-purpose digital interfacing between different logic families or voltage domains. Its 2 V to 5.5 V operating range allows it to interface 3.3-V and 5-V logic, while the inverting outputs provide signal inversion when needed. The 3-state outputs enable bus sharing in multi-device systems. The low-drive CMOS design is suitable for low-noise applications where signal integrity is important.
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Low-Noise Signal Distribution
The SN74LV240A is ideal for low-noise signal distribution due to its low-drive CMOS design, which minimizes output ground bounce and noise. It can be used to distribute signals to multiple loads without degrading signal quality. The 8 mA drive at 3.3 V is sufficient for driving short traces and multiple inputs. The 3-state outputs allow the signal line to be isolated when not in use, reducing noise coupling.
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Test and Measurement Equipment
The SN74LV240A is used in test and measurement equipment for signal buffering and driving. Its wide voltage range and 3-state outputs make it suitable for interfacing with various test instruments. The low noise characteristics ensure accurate signal measurement, while the 8 mA drive can drive long cables and multiple loads. The device's robustness, including latch-up performance exceeding 250 mA per JESD 17, ensures reliable operation in demanding test environments.
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推薦產品摘要
工程參考資料，適用於 SN74LV240A — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SN74LVC240A | SN74AHCT240A | SN74HCT240A | 74LVT240A | MC74LVX240 |
|---|---|---|---|---|---|---|
| Package | SOIC-20, SSOP-20, TSSOP-20 | SOIC-20, SSOP-20, TSSOP-20 | SOIC-20, TSSOP-20 | SOIC-20, TSSOP-20 | SOIC-20, TSSOP-20 | SOIC-20, TSSOP-20 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | onsemi |
| Supply Voltage Range | 2 V to 5.5 V | 1.65 V to 3.6 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 3.6 V | 2 V to 3.6 V |
| Output Drive Current | 8 mA at 3.3 V | 24 mA at 3.3 V | 8 mA at 5 V | 6 mA at 5 V | 32 mA at 3.3 V | 4 mA at 3.3 V |
| Logic Function | Inverting Buffer/Driver | Inverting Buffer/Driver | Inverting Buffer/Driver | Inverting Buffer/Driver | Inverting Buffer/Driver | Inverting Buffer/Driver |
| 3-State Outputs | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C | -40°C to 85°C |
主要差異化特點
- Low-drive CMOS design for low noise (對比SN74LVC240A)
- Wide operating voltage range (對比74LVT240A)
- Latch-up performance exceeds 250 mA per JESD 17 (對比MC74LVX240)
設計說明
Place a 0.1 µF ceramic capacitor close to the VCC pin and a 10 µF bulk capacitor on the power supply rail to ensure stable operation. The SN74LV240A operates from 2 V to 5.5 V, so ensure the supply voltage is within this range. Decoupling is critical to minimize noise and prevent false triggering of the 3-state outputs.
Keep traces between the SN74LV240A and bus lines as short as possible to minimize signal degradation. Use controlled impedance traces for high-speed signals. The 3-state outputs can drive multiple loads, but ensure the total capacitance on the bus does not exceed the device's drive capability. Add series resistors if needed to reduce ringing.
Do not leave the output enable (OE) pins floating. Tie 1OE and 2OE to a defined logic level to avoid bus contention. When the outputs are disabled (high-impedance), ensure the bus is pulled to a known state with pull-up or pull-down resistors. Also, avoid exceeding the absolute maximum ratings for VCC and input voltages to prevent damage.
合規資訊
RoHS compliant per TI product page. Not AEC-Q100 qualified. Lead-free per TI's green packaging.
