Overview
The SN74AC373NSR is an octal D-type transparent latch with 3-state outputs, manufactured by Texas Instruments. This integrated circuit is designed to operate over a wide range of supply voltages from 2V to 6V, making it versatile for various applications. When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs, and when LE is low, the Q outputs are latched at the logic levels of the D inputs. The device also features a buffered output-enable (OE) input that can place the eight outputs in either a normal logic state or a high-impedance state, which is useful for driving bus lines without the need for interface or pullup components.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| VCC Supply Voltage Range | - | V | -0.5 | - | 7 |
| VI Input Voltage Range | - | V | -0.5 | - | VCC + 0.5 |
| VO Output Voltage Range | - | V | -0.5 | - | VCC + 0.5 |
| IOH High-Level Output Current | VCC = 3 V | mA | -12 | - | -12 |
| IOL Low-Level Output Current | VCC = 3 V | mA | 12 | - | 12 |
| Ta Operating Free-Air Temperature | - | °C | -40 | - | 85 |
| tPLH Propagation Delay Time, LE to Q | VCC = 5 V, CL = 15 pF | ns | 7.3 | - | 13.5 |
| tPHL Propagation Delay Time, LE to Q | VCC = 5 V, CL = 15 pF | ns | 7.3 | - | 13.5 |
| RθJA Junction-to-Ambient Thermal Resistance | - | °C/W | 60 | - | 126.2 |
Key Features
- Operation over a wide range of supply voltages from 2V to 6V.
- 3-state noninverting outputs capable of driving bus lines directly.
- Full parallel access for loading data into the latches.
- Buffered output-enable (OE) input to control the output state (normal logic or high-impedance state).
- High drive capability to handle highly capacitive or low-impedance loads.
- Low propagation delay times, with a maximum of 9.5 ns at VCC = 5 V.
- Available in various packages including SSOP, SOIC, PDIP, SOP, and TSSOP.
Applications
- Buffer registers: The SN74AC373NSR can be used to implement buffer registers due to its ability to latch data and drive bus lines.
- I/O ports: Suitable for implementing input/output ports in digital systems.
- Bidirectional bus drivers: The 3-state outputs make it ideal for driving bus lines in bidirectional communication systems.
- Working registers: Can be used as working registers in various digital circuits).
Q & A
- What is the operating voltage range of the SN74AC373NSR?
The SN74AC373NSR operates over a supply voltage range from 2V to 6V).
- What is the purpose of the output-enable (OE) input?
The OE input can place the outputs in either a normal logic state or a high-impedance state, which is useful for driving bus lines without interface or pullup components).
- What are the typical propagation delay times for the SN74AC373NSR?
The typical propagation delay times are around 7.3 ns to 13.5 ns depending on the load capacitance and supply voltage).
- What are the thermal characteristics of the SN74AC373NSR?
The junction-to-ambient thermal resistance (RθJA) varies by package, with values ranging from 60°C/W to 126.2°C/W).
- What are the recommended operating conditions for the input and output voltages?
The input voltage range is from 0 to VCC + 0.5V, and the output voltage range is from 0 to VCC + 0.5V).
- What is the maximum continuous output current for the SN74AC373NSR?
The maximum continuous output current is ±50 mA).
- What are the typical high-level and low-level output currents?
The typical high-level output current is -12 mA to -24 mA, and the typical low-level output current is 12 mA to 24 mA, depending on the supply voltage).
- What are the common applications of the SN74AC373NSR?
Common applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers).
- What packages are available for the SN74AC373NSR?
The device is available in SSOP, SOIC, PDIP, SOP, and TSSOP packages).
- How does the latch-enable (LE) input function?
When the LE input is high, the Q outputs follow the D inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs).
