74HC245D - Octal 3-State Bus Transceiver | Logic IC
MPN: 74HC245D ✓ Hoạt động74HC245D Tóm tắt
A bus transceiver is a bidirectional interface IC that connects two logic buses, allows data to move in a selected direction, and places its outputs into a high-impedance state when disabled. The 74HC family belongs to high-speed CMOS logic and combines low power dissipation with performance comparable to LSTTL, making it useful in digital systems, memory interfaces, peripheral buses, and embedded control equipment.
The verified product description identifies the device as an octal bus transceiver with three-state outputs. The DIR input determines the direction of data flow between the A and B buses, while the active-low output-enable input provides bus isolation. Because the outputs can be disabled, multiple drivers can share a bus when only one device is actively enabled, provided the system obeys the relevant electrical and timing constraints.
The 74HC245D is manufactured using silicon-gate C2MOS technology and is specified as a high-speed CMOS logic device. Its transceiver architecture is non-inverting, so the data presented on one bus is transferred without intentional logic inversion when the corresponding direction is selected. The package is a 20-SOIC surface-mount package, matching the distributor listing for Toshiba Semiconductor and Storage.
Typical applications include bidirectional data buses, microcontroller peripheral interfaces, memory-bus isolation, industrial control systems, and communication equipment. When designing a PCB, preserve the manufacturer pin assignment, provide adequate supply decoupling, and route high-speed bus traces with controlled impedance where required. Confirm enable polarity and direction timing before connecting external circuitry.
This product page combines the verified manufacturer and distributor descriptions with package, application, and sourcing context. Electrical limits such as supply voltage, propagation delay, output current, and operating temperature were not included in the supplied source data and are therefore not inferred here.
Bộ thay thế dễ dàng lắp đặt cho 74HC245D — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
SN74HC245N
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SN74HC245NSR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
74HC245D,653
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
74HC245D
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →74HC245
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
74HC245D Tỷ lệ tối đa & tính chất điện
| Product Type | Octal bus transceiver |
| Data Direction | Bidirectional, selectable by DIR |
| Logic Family | 74HC high-speed CMOS |
| Number of Elements | 1 element |
| Bits per Element | 8 bits |
| Output State | 3-state output |
| Polarity | Non-inverting |
| Technology | Silicon-gate C2MOS |
| Hộp | 20-SOIC |
| Kiểu lắp đặt | Surface Mount |
| Output Enable | Active-low OE control |
| Direction Control | DIR input |
| Application | Asynchronous two-way bus communication |
Hướng dẫn cấu hình chân 74HC245D 20-soic
Cấu hình chân cho 74HC245D (20-soic gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho 74HC245D.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
74HC245D phù hợp cho 6 Áp dụngs: Bidirectional Digital Data Bus, Microcontroller Peripheral Interface, Memory-Bus Isolation, Industrial Control Signal Conditioning, Communication Equipment Backplane, Instrumentation and Test Systems.
Bidirectional Digital Data Bus
The 74HC245D fits a bidirectional digital data bus because it provides eight parallel channels, selectable direction, and three-state outputs in a 20-SOIC package. It can connect a controller-side bus to a peripheral-side bus while keeping disabled outputs isolated. The verified source identifies asynchronous two-way communication and does not provide propagation-delay limits, so timing margins must be checked against the system clock and load before deployment.
Được đề xuất
Microcontroller Peripheral Interface
For a microcontroller peripheral interface, the 74HC245D can buffer eight data lines and place the outputs in a high-impedance state when the bus is not selected. This is useful when several peripheral buses share a common wiring harness or when a controller must control propagation between circuit domains. Verify the controller voltage, input thresholds, output drive, and enable timing because those ratings are not present in the supplied source snippets.
Được đề xuất
Memory-Bus Isolation
The 74HC245D can be used around a memory-bus segment when the designer needs controlled bidirectional access and tri-state isolation rather than permanent two-way loading. The eight-bit width matches common parallel data structures, while DIR selects the active transfer direction and OE isolates the outputs during idle periods. The verified material does not include memory-specific voltage, timing, or drive values, so compatibility with a particular memory must be established from the complete datasheets.
Được đề xuất
Industrial Control Signal Conditioning
The 74HC245D is suitable as a digital isolation and buffering element in industrial control assemblies that need to distribute eight control or status lines while preventing bus contention. Three-state outputs allow a controller to disconnect a branch during maintenance or alternate addressing intervals. Industrial suitability cannot be inferred from the basic logic description; confirm supply tolerance, noise margins, temperature range, and any required industrial qualification from the selected manufacturer documentation.
Được đề xuất
Communication Equipment Backplane
In communication equipment, the 74HC245D can support parallel control or status paths on a backplane where bidirectional access and bus isolation are required. The octal organization allows a complete byte to be routed in one device, and the tri-state outputs help avoid multiple drivers during module selection. The verified source provides the functional architecture but not insertion, removal, or hot-plug specifications, so designers should review the manufacturer’s timing and operating limits before using the part in live backplanes.
Được đề xuất
Instrumentation and Test Systems
The 74HC245D can buffer parallel command and measurement-control lines in instrumentation systems where several modules must share a bus and inactive modules must present high impedance. Its non-inverting transceiver structure simplifies control-logic design, while the 20-SOIC package supports conventional surface-mount assembly. Because the supplied source does not specify noise, timing, or temperature characteristics, laboratory instrumentation should validate the complete electrical envelope and grounding strategy before deployment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho 74HC245D — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | SN74HC245N | SN74HC245NSR | 74HC245D,653 | 74HC245 |
|---|---|---|---|---|---|
| Package | 20-SOIC | SOIC-20 | SOIC-20 | 20-SO | SOIC-20 variant |
| Brand | Toshiba Semiconductor and Storage | Texas Instruments | Texas Instruments | NXP Semiconductors | NXP Semiconductors |
| Function | Octal bus transceiver | Octal bus transceiver | Octal bus transceiver | Octal bus transceiver | Octal bus transceiver |
| Data Width | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Output State | 3-state | 3-state | 3-state | 3-state | 3-state |
| Direction | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| Logic Family | 74HC CMOS | 74HC CMOS | 74HC CMOS | 74HC CMOS | 74HC CMOS |
Bảo phân biệt quan trọng
- Eight-channel bidirectional interface (vsSN74HC245N)
- Toshiba 20-SOIC listing (vs74HC245D,653)
- Three-state bus isolation (vsSN74HC245NSR)
- C2MOS high-speed CMOS positioning (vs74HC245)
Ghi chú thiết kế
Keep the transceiver’s supply decoupling close to its power pins and preserve the manufacturer’s 20-SOIC footprint and pin numbering. Route the eight data lines as a grouped parallel channel where practical, minimize stubs, and keep the DIR and OE control traces away from sensitive analog or clock paths. Because the supplied data does not include a complete pinout, verify every connection against the selected manufacturer datasheet before fabrication.
Do not enable two output drivers onto the same bus unless the system explicitly supports bus contention and all timing constraints are satisfied. Use the OE function to place inactive devices in the high-impedance state, and check the manufacturer’s direction-control and output-enable truth tables. The verified snippets do not provide propagation-delay values, so enable/dead-time timing must be calculated from the complete datasheet.
Validate the actual supply voltage, input thresholds, output drive, and input/output current before using the 74HC245D between voltage domains. The retrieved data identifies a high-speed CMOS transceiver but does not provide its voltage limits, so it cannot by itself establish 3.3 V/5 V level-shifting suitability. Add local supply bypass, maintain return-current continuity, and verify the selected manufacturer’s absolute-maximum and recommended-operating ratings.
Thông tin tuân thủ
The supplied verified data does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is not applicable to the supplied general-purpose logic-device description.
