Overview
The SN74HC125PWT 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 designed to operate over a wide range of temperatures and voltages, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| Operating Temperature Range | –40 | 25 | 85 | °C |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V) | 3.15 (VCC=4.5V) | 4.2 (VCC=6V) | V |
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V) | 1.35 (VCC=4.5V) | 1.8 (VCC=6V) | V |
| Output High Voltage (VOH) | 1.9 (VCC=2V, IOH=-20µA) | 4.4 (VCC=4.5V, IOH=-20µA) | 5.9 (VCC=6V, IOH=-20µA) | V |
| Output Low Voltage (VOL) | 0.1 (VCC=2V, IOL=20µA) | 0.1 (VCC=4.5V, IOL=20µA) | 0.1 (VCC=6V, IOL=20µA) | V |
| Propagation Delay Time (tpd) | 11 | ns | ||
| Input Transition Time (tt) | 1000 (VCC=2V) | 500 (VCC=4.5V) | 400 (VCC=6V) | ns |
| Package Type | TSSOP-14 |
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
- High-current 3-state outputs
- Low input current of 1 µA maximum
- ±6-mA output drive at 5 V
- Typical propagation delay time of 11 ns
Applications
- TV Set-Top Boxes and DVRs
- E-meters
- Smart Grids: Transmission Line Monitoring
- Printers and Computer Peripherals
- Building Security: Control Panels
- IP Phones
Q & A
- What is the operating voltage range of the SN74HC125PWT?
The operating voltage range is from 2 V to 6 V.
- What is the operating temperature range of the SN74HC125PWT?
The operating temperature range is from –40°C to +85°C.
- How many independent buffers does the SN74HC125PWT contain?
The device contains four independent buffers.
- What is the typical propagation delay time of the SN74HC125PWT?
The typical propagation delay time is 11 ns.
- What is the maximum output drive current at 5 V?
The maximum output drive current at 5 V is ±6 mA.
- What type of package does the SN74HC125PWT come in?
The device comes in a TSSOP-14 package.
- How should the output enable (OE) pin be handled during power-up or power-down to ensure a high-impedance state?
The OE pin should be tied to VCC through a pull-up resistor to ensure a high-impedance state during power-up or power-down.
- What is the recommended input transition time to avoid oscillations and damaging shoot-through current?
The recommended input transition time is less than 1000 ns for VCC = 2 V, 500 ns for VCC = 4.5 V, and 400 ns for VCC = 6 V.
- What is the purpose of the bypass capacitor in the power supply recommendations?
The bypass capacitor is used to prevent power disturbances and should be installed close to the power terminal.
- What are some common applications of the SN74HC125PWT?
Common applications include TV Set-Top Boxes, E-meters, Smart Grids, Printers, Computer Peripherals, Building Security Control Panels, and IP Phones.
