SN74AHC125N 4-Channel Non-Inverting Buffer/Line Driver IC DIP-14

SN74AHC125N 4-Channel Non-Inverting Buffer/Line Driver IC DIP-14 is a high-speed CMOS device designed for bus-oriented applications where signal integrity and high-speed data transmission are paramount. This integrated circuit features four independent non-inverting buffers with 3-state outputs, which allows multiple devices to share a single bus line without interference. Consequently, each channel operates independently when the corresponding output-enable input is low, providing a direct logic path from input to output. Furthermore, the AHC (Advanced High-Speed CMOS) technology ensures significantly lower power consumption than traditional bi-polar logic while maintaining comparable speeds. Therefore, you should utilize the SN74AHC125N when your design requires reliable level shifting or high-fanout signal distribution in complex digital systems.

Key Features:

• Quad Independent Buffers: The IC houses four separate buffer circuits, allowing for versatile signal routing across different parts of a PCB.
• 3-State Outputs: Each buffer features a dedicated output-enable (ØE) pin, which places the output in a high-impedance state when driven high.
• High-Speed Operation: The device achieves a typical propagation delay of only 3.8 ns at a 5V supply, ensuring minimal latency in high-speed data paths.
• Wide Operating Voltage: It supports a broad supply range from 2 V to 5.5 V, making it compatible with both legacy 5V systems and modern 3.3V logic.
• Low Power Consumption: It utilizes CMOS technology to maintain extremely low static power dissipation, typically around 20 µA.

Technical Specifications:

• Logic Family: AHC (Advanced High-Speed CMOS)
• Supply Voltage (V_CC): 2.0 V to 5.5 V
• Input Voltage (V_I): 0 V to 5.5 V (Inputs are 5V tolerant even at lower V_CC)
• Output Current (I_OH/I_OL): ±8 mA at 5 V
• Propagation Delay (t_pd): ≈ 3.8 ns to 5.5 ns (at 5V V_CC)
• Operating Temperature: −40°C to +125°C
• Number of Channels: 4

Mechanical Specifications:

• Package Type: PDIP-14 (Plastic Dual In-line Package)
• Mounting Style: Through-Hole
• Number of Pins: 14
• Lead Frame: Copper alloy with tinned finish for reliable soldering.

Dimensions:

• Length: ≈ 19.30 mm
• Width (Body): ≈ 6.35 mm
• Total Width (Including Pins): ≈ 7.62 mm
• Height: ≈ 4.57 mm (Max)
• Pin Pitch: 2.54 mm (Standard 0.1 inch)

Pinout and Wiring:

• Pin 1, 4, 10, 13 (1ØE to 4ØE): Output-Enable inputs. Pull these pins LOW to activate the corresponding buffer output.
• Pin 2, 5, 9, 12 (1A to 4A): Data inputs for the four buffer channels.
• Pin 3, 6, 8, 11 (1Y to 4Y): Non-inverting data outputs.
• Pin 7 (GND): Connect to the circuit ground (0 V).
• Pin 14 (V_CC): Connect to the positive DC power supply.
• Wiring Note: However, you must include a 0.1 µF decoupling capacitor near Pin 14 to suppress switching noise and maintain stability.

Datasheet Reference:

• Download Texas Instruments SN74AHC125N Datasheet

Commonly Used in:

• Bus Interfacing: Connecting multiple peripherals to a shared communication bus in embedded systems.
• Voltage Level Translation: Acting as a bridge between 3.3V microcontrollers and 5V sensors or displays.
• Signal Isolation: Disconnecting specific circuit segments when not in use to prevent bus loading.

Applications:

• Memory Address Driving: Buffering address lines in high-density memory arrays to improve signal edges.
• LED Matrix Control: Providing the necessary current drive for large-scale LED arrays.
• Test Equipment: Isolating sensitive measurement inputs from high-speed digital noise.

Equivalent Models:

• 74HCT125: A TTL-compatible variant of the quad buffer series.
• 74LV125: A low-voltage version optimized for 1.2V to 3.6V operation.
• CD74AC125: A high-performance Advanced CMOS version with even higher current drive capability, nevertheless, pin compatibility remains the same.

Package Includes:

• 1 x SN74AHC125N 4-Channel Non-Inverting Buffer/Line Driver IC DIP-14