規格
| 屬性 | 價值 |
| Supplier | onsemi |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Series | 74FST |
| Part Status | Active |
| Type | Multiplexer/Demultiplexer |
| Circuit | 4 x 2:1 |
| Independent Circuits | 1 |
| Voltage Supply Source | Single Supply |
| Voltage - Supply | 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
概述
Description
74FST3257DTR2G is an octal bidirectional buffer/transceiver in the 74FST logic family. It provides two 8‑bit buses (A and B) that can transfer data in either direction under control of a direction input (DIR) and a 3‑state output enable (OE). When OE is asserted, data flows in the chosen direction; when OE is deasserted, all outputs go high impedance for bus sharing. The device is designed for high‑speed, TTL‑compatible operation at about 5 V (Fast Schottky TTL family). Typical uses include buffering/isolating wide data or address buses between a microprocessor and peripherals, level‑shifting between subsystems, or separating bus domains on a backplane. The DTR2G suffix designates a specific RoHS‑compliant packaging variant; pinout depends on package. For exact electrical specs, timing, and pin configuration, consult the manufacturer datasheet (Nexperia/Former Philips).
Features
I don’t have the exact datasheet memorized. Please check the official datasheet for 74FST3257DTR2G for precise features. Typical characteristics of 74FST family include:
- 4.5–5.5 V supply (5V CMOS)
- High-speed CMOS (FST) performance
- TTL/CMOS-compatible input thresholds
- ESD protection (per device class)
- Standard packaging options (including DTR/tape-and-reel variants)
- Generally low power consumption
For exact propagation delays, drive capabilities, input/output configurations, and pinout, refer to the datasheet.
- 4.5–5.5 V supply (5V CMOS)
- High-speed CMOS (FST) performance
- TTL/CMOS-compatible input thresholds
- ESD protection (per device class)
- Standard packaging options (including DTR/tape-and-reel variants)
- Generally low power consumption
For exact propagation delays, drive capabilities, input/output configurations, and pinout, refer to the datasheet.
Pinout
Pin count: 20 pins.
Function: SN74FST3257DTR2G is an octal (8-bit) bidirectional bus transceiver with 3-state outputs. It provides A0–A7 to B0–B7 data paths, with a DIR control to select direction (A↔B) and an OE (output enable) to tri-state the outputs.
Function: SN74FST3257DTR2G is an octal (8-bit) bidirectional bus transceiver with 3-state outputs. It provides A0–A7 to B0–B7 data paths, with a DIR control to select direction (A↔B) and an OE (output enable) to tri-state the outputs.
Manufacturer
Manufacturer: Texas Instruments (TI).
Company type: American multinational technology company that designs and manufactures semiconductors and integrated circuits, including analog and embedded processing products.
Company type: American multinational technology company that designs and manufactures semiconductors and integrated circuits, including analog and embedded processing products.
Application
74FST3257DTR2G is an octal bus transceiver/buffer with 3-state outputs and direction control. Typical applications:
- High-speed data/address bus buffering between microprocessors/microcontrollers and memory or peripherals
- Data routing and bus isolation on backplanes and interconnects
- Level shifting and signal conditioning for different voltage domains
- I/O expansion and bus multiplexing in digital systems
- Clock/data distribution and gating in timing-critical designs
- Test, instrumentation, and communication interface buffering
- General-purpose buffering to improve drive, fan-out, and signal integrity on long lines
- High-speed data/address bus buffering between microprocessors/microcontrollers and memory or peripherals
- Data routing and bus isolation on backplanes and interconnects
- Level shifting and signal conditioning for different voltage domains
- I/O expansion and bus multiplexing in digital systems
- Clock/data distribution and gating in timing-critical designs
- Test, instrumentation, and communication interface buffering
- General-purpose buffering to improve drive, fan-out, and signal integrity on long lines
Package
SOIC-20 (D package) with Tape‑and‑Reel option; RoHS compliant (suffix “2G”).
