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The 74HCT245PW,118 is an 8-bit bidirectional, 3-state, non-inverting bus transceiver from Nexperia's 74HCT series. Utilizing advanced CMOS technology, it is designed for asynchronous bidirectional data bus communication, enabling data isolation and directional control between two independent bus systems. Its wide operating voltage range and strong drive capability make it widely used in microprocessor systems, data bus buffering, level shifting, and general-purpose logic interface expansion.
Category:Integrated Circuits (ICs);Logic;Buffers, Drivers, Receivers, Transceivers
Manufacturer:Nexperia USA Inc.
Series:74HCT
Packaging:Tape & Reel (TR);Cut Tape (CT)
Part Status:Active
Logic Type:Transceiver, Non-Inverting
Number of Elements:1
Number of Bits per Element:8
Output Type:3-State
Current - Output High, Low:6mA, 6mA
Voltage - Supply:4.5V ~ 5.5V
Operating Temperature:-40°C ~ 125°C (TA)
Mounting Type:Surface Mount
Package / Case:20-TSSOP (0.173", 4.40mm Width)
Supplier Device Package:20-TSSOP
Base Product Number:74HCT245
Bidirectional Data Transfer & Direction Control: A dedicated Direction Control pin (DIR) allows flexible setting of data flow (from Bus A to Bus B, or vice versa). Coupled with the Output Enable pin (OE), all outputs can be placed in a high-impedance state, providing electrical isolation from the bus and supporting multi-device bus sharing.
Non-Inverting Logic: Signals are transmitted without logical inversion, preserving the original data and simplifying logic planning during system design.
3-State Outputs: When disabled, outputs enter a high-impedance state, preventing load on the bus. This is a key feature for bus arbitration and multi-master systems.
Strong Drive Capability: Provides balanced ±6mA drive current, capable of driving relatively heavy loads (e.g., multiple parallel inputs or longer traces), improving signal integrity.
Wide Voltage Compatibility: The 4.5V to 5.5V supply range is perfectly compatible with traditional 5V TTL logic systems. Its input thresholds are optimized for TTL levels, allowing direct interfacing with 5V TTL devices.
High-Speed CMOS Performance: Based on HCT technology, it offers faster speeds than standard HC series while maintaining low power consumption, with typical propagation delays in the tens of nanoseconds.
Industrial Temperature Range: Operation from -40°C to 125°C ensures reliability in demanding industrial and automotive environments.
Microprocessor/Microcontroller Systems: Serves as a buffer/driver for data buses (D0-D7), enhancing CPU drive capability or isolating the CPU from peripheral buses.
Bus Isolation & Expansion: Establishes bidirectional data channels between two subsystems or boards, such as between a main control board and display modules, memory boards, or I/O expansion boards.
Level Shifting & Interface: Provides signal buffering and drive strengthening between systems in different voltage domains but with logic compatibility (e.g., 5V MCU and 5V peripherals).
Parallel Data Communication: Used as data line driving and isolation in parallel port communications, printer interfaces, and legacy instrument interfaces.
Test & Simulation Equipment: Used for signal access and monitoring in circuit emulation and bus analyzers.
The 74HCT245PW,118 is a classic, reliable, and functionally flexible 8-bit bus transceiver. Its core value lies in providing a complete bidirectional data path management solution, including direction control, 3-state isolation, and signal enhancement. For any digital system design requiring enhanced bus drive capability, multi-device bus sharing, or data exchange between subsystems, it is a extensively proven fundamental building block. Its industrial-grade robustness and native compatibility with 5V TTL systems ensure its continued importance in both legacy upgrade projects and modern embedded systems.
Industry Information
