Overview
The SN74HC125PW is a quadruple buffer with 3-state outputs produced by Texas Instruments. This device is part of the 74HC series, known for its high-speed CMOS logic. It contains four independent buffers, each performing the Boolean function Y = A in positive logic. The device is available in a 14-pin TSSOP package, making it suitable for a variety of applications where compact size and low power consumption are essential.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 2 to 6 | V |
| Operating Temperature Range | –40 to +85 | °C |
| Input Voltage Range | 0 to VCC | V |
| Output Voltage Range | 0 to VCC | V |
| High-Level Output Voltage (VOH) at VCC=5V, IOH=-20µA | 4.4 | V |
| Low-Level Output Voltage (VOL) at VCC=5V, IOL=20mA | 0.1 | V |
| Input Transition Time | 1000 ns (VCC=2V), 500 ns (VCC=4.5V), 400 ns (VCC=6V) | ns |
| Propagation Delay (tpd) at CL=50pF | 11 to 31 ns | ns |
| Input Capacitance | 3 to 10 pF | pF |
| Package Type | TSSOP (14-pin) | |
| Package Size | 5.00 mm × 4.40 mm | mm |
Key Features
- Buffered inputs
- Wide operating voltage range: 2 V to 6 V
- Wide operating temperature range: –40°C to +85°C
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Low input current of 1 µA maximum
- ±6-mA output drive at 5 V
- 3-state outputs for bus-oriented applications
Applications
- Enable digital signals in various electronic systems
- IP Phones
- TV Set-Top Boxes and DVRs
- E-meters
- Smart Grids: Transmission Line Monitoring
- Printers and Computer Peripherals
- Building Security: Control Panels
- Test and Measurement: Range Readers
Q & A
- What is the SN74HC125PW used for? The SN74HC125PW is used as a quadruple buffer with 3-state outputs, enabling digital signals in various electronic systems.
- What is the operating voltage range of the SN74HC125PW? The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the SN74HC125PW? The operating temperature range is from –40°C to +85°C.
- What is the package type and size of the SN74HC125PW? The package type is TSSOP (14-pin), and the size is 5.00 mm × 4.40 mm.
- What are the key features of the SN74HC125PW? Key features include buffered inputs, wide operating voltage and temperature ranges, support for up to 10 LSTTL loads, significant power reduction, low input current, and ±6-mA output drive at 5 V.
- What are some common applications of the SN74HC125PW? Common applications include IP Phones, TV Set-Top Boxes and DVRs, E-meters, Smart Grids, Printers and Computer Peripherals, Building Security, and Test and Measurement devices.
- How do you ensure the high-impedance state during power-up or power-down? To ensure the high-impedance state during power-up or power-down, the OE (Output Enable) should be tied to VCC through a pull-up resistor.
- What is the recommended input transition time for the SN74HC125PW? The recommended input transition time varies by VCC: 1000 ns for VCC=2V, 500 ns for VCC=4.5V, and 400 ns for VCC=6V.
- What is the typical propagation delay of the SN74HC125PW? The typical propagation delay is around 11 to 31 ns at CL=50pF.
- How should the power supply be managed for the SN74HC125PW? Each VCC terminal should have a bypass capacitor to prevent power disturbance. A 0.1-μF capacitor is recommended, and it is acceptable to parallel multiple bypass caps to reject different frequencies of noise.
