Overview
The SN74AC373DWR 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 eight D-type latches with 3-state outputs, making it suitable for a variety of applications including buffer registers, I/O ports, bidirectional bus drivers, and working registers.
When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs. A buffered output-enable (OE) input allows the outputs to be placed in either a normal logic state or a high-impedance state, enabling direct drive of bus lines.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC Supply Voltage | V | 2 | - | 6 |
| VIH High-Level Input Voltage (VCC = 5.5V) | V | 3.85 | - | - |
| VIL Low-Level Input Voltage (VCC = 5.5V) | V | 1.65 | - | - |
| IOH High-Level Output Current (VCC = 5.5V) | mA | -24 | - | - |
| IOL Low-Level Output Current (VCC = 5.5V) | mA | 24 | - | - |
| tPLH Propagation Delay Time (VCC = 5V) | ns | 1.5 | 7 | 9.5 |
| tPHL Propagation Delay Time (VCC = 5V) | ns | 1.5 | 7 | 9.5 |
| TA Operating Free-Air Temperature | °C | -40 | - | 85 |
| RθJA Junction-to-Ambient Thermal Resistance | °C/W | 101.2 | - | - |
Key Features
- Operation over a wide VCC range of 2V to 6V.
- Inputs accept voltages up to 6V.
- Maximum propagation delay time of 9.5ns at VCC = 5V.
- 3-state noninverting outputs capable of driving bus lines directly.
- Full parallel access for loading data.
- Buffered output-enable (OE) input for high-impedance state control.
- Suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
Applications
- Buffer registers: The SN74AC373DWR can be used to buffer data, ensuring that the output remains stable even when the input changes.
- I/O ports: It can act as an interface between different parts of a system, controlling the flow of data.
- Bidirectional bus drivers: The component can drive bus lines in both directions, making it useful in bus-oriented systems.
- Working registers: It can store and manipulate data temporarily, which is essential in various digital circuits.
Q & A
- What is the voltage range for the VCC supply of the SN74AC373DWR?
The VCC supply voltage range is from 2V to 6V.
- What is the maximum propagation delay time at VCC = 5V?
The maximum propagation delay time at VCC = 5V is 9.5ns.
- What is the purpose of the output-enable (OE) input?
The OE input allows the outputs to be placed in either a normal logic state or a high-impedance state.
- What are the typical applications of the SN74AC373DWR?
Typical applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the operating free-air temperature range for the SN74AC373DWR?
The operating free-air temperature range is from -40°C to 85°C.
- What is the junction-to-ambient thermal resistance for the SOIC package?
The junction-to-ambient thermal resistance for the SOIC package is 101.2°C/W.
- How many latches does the SN74AC373DWR contain?
The SN74AC373DWR contains eight D-type latches.
- What is the function of the latch-enable (LE) input?
The LE input controls whether the outputs follow the data inputs or are latched at the current logic levels.
- Is the SN74AC373DWR RoHS compliant?
- What are the package options available for the SN74AC373?
The package options include SSOP, SOIC, PDIP, SOP, and TSSOP.
