Overview
The SN74AC373NS is an octal D-type transparent latch produced by Texas Instruments. This component is part of the 74AC series, known for its high-speed and low-power CMOS logic. The device features 3-state outputs, making it suitable for driving highly capacitive or relatively low-impedance loads. It is particularly useful in applications such as buffer registers, I/O ports, bidirectional bus drivers, and working registers.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage Range | 2 | 6 | V | |
| Input Voltage Range | −0.5 | VCC + 0.5 | V | |
| Output Voltage Range | −0.5 | VCC + 0.5 | V | |
| Operating Free-Air Temperature Range | −40 | 85 | °C | |
| High-Level Input Voltage (VCC = 5.5V) | 3.85 | V | ||
| Low-Level Input Voltage (VCC = 5.5V) | 1.65 | V | ||
| High-Level Output Current (VCC = 5.5V, IOH = −24 mA) | 4.76 | V | ||
| Low-Level Output Current (VCC = 5.5V, IOL = 24 mA) | 0.44 | V | ||
| Pulse Duration, LE High | 4 | 4.5 | 5 | ns |
| Setup Time, Data Before LE↓ | 4 | 4.5 | 5 | ns |
| Hold Time, Data After LE↓ | 1 | ns | ||
| Propagation Delay Time (tpd) at VCC = 5V | 9.5 | ns |
Key Features
- Operation over a supply voltage range of 2V to 6V
- Inputs accept voltages up to 6V
- Maximum propagation delay time (tpd) of 9.5ns at 5V
- 3-state noninverting outputs capable of driving bus lines directly
- Full parallel access for loading data
Applications
The SN74AC373NS is particularly suitable for various applications, including:
- Buffer registers
- I/O ports
- Bidirectional bus drivers
- Working registers
Q & A
- What is the operating voltage range of the SN74AC373NS?
The SN74AC373NS operates over a supply voltage range of 2V to 6V.
- What is the maximum propagation delay time (tpd) at 5V?
The maximum propagation delay time (tpd) at 5V is 9.5ns.
- What type of outputs does the SN74AC373NS have?
The SN74AC373NS features 3-state noninverting outputs.
- What is the purpose of the OE (Output Enable) pin?
The OE pin controls the output state, enabling or disabling the outputs to a high-impedance state.
- What is the significance of the LE (Latch Enable) pin?
The LE pin is used to latch the data from the input to the output when it transitions from high to low.
- What are the typical applications of the SN74AC373NS?
The SN74AC373NS is used in buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the operating temperature range of the SN74AC373NS?
The operating temperature range is from −40°C to 85°C.
- How should unused inputs be handled for proper device operation?
Unused inputs must be held at VCC or GND to ensure proper device operation.
- What is the maximum continuous output current?
The maximum continuous output current is ±50 mA.
- What is the thermal resistance (RθJA) for the TSSOP package?
The thermal resistance (RθJA) for the TSSOP package is approximately 60°C/W.
