Overview
The SN74AC373N 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 various digital logic applications. When the latch-enable (LE) input is high, the Q outputs follow the D inputs. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs. The buffered output-enable (OE) input allows the outputs to be placed in either a normal logic state or a high-impedance state, which is useful for driving bus lines directly.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC Supply Voltage | 2 | 6 | V |
| VIH High-Level Input Voltage (VCC = 5.5V) | 3.85 | 3.85 | V |
| VIL Low-Level Input Voltage (VCC = 5.5V) | 1.65 | 1.65 | V |
| IOH High-Level Output Current (VCC = 5.5V) | -24 | -24 | mA |
| IOL Low-Level Output Current (VCC = 5.5V) | 24 | 24 | mA |
| Δt/Δv Input Transition Rise or Fall Rate | 8 | 8 | ns/V |
| TA Operating Free-Air Temperature | -40 | 85 | °C |
| tPLH Propagation Delay Time (VCC = 5V) | 1.5 | 9.5 | ns |
| tPHL Propagation Delay Time (VCC = 5V) | 1.5 | 9.5 | ns |
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 that can drive bus lines directly.
- Full parallel access for loading data.
- Buffered output-enable input for high-impedance state control.
- Suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.
Applications
The SN74AC373N is particularly useful in various digital logic applications, including:
- Buffer registers: To temporarily store data and protect it from changes.
- I/O ports: For input/output operations in microprocessor systems.
- Bidirectional bus drivers: To manage data flow on buses in complex digital systems.
- Working registers: For temporary storage and manipulation of data within digital circuits.
Q & A
- What is the voltage range for the VCC supply of the SN74AC373N?
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 is 9.5ns at VCC = 5V.
- Can the inputs of the SN74AC373N accept voltages higher than VCC?
Yes, the inputs can accept voltages up to 6V.
- 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 some common applications of the SN74AC373N?
Common applications include buffer registers, I/O ports, bidirectional bus drivers, and working registers.
- What is the operating free-air temperature range for the SN74AC373N?
The operating free-air temperature range is from -40°C to 85°C.
- How many latches does the SN74AC373N contain?
The device contains eight D-type latches.
- What is the function of the latch-enable (LE) input?
The LE input controls whether the outputs follow the inputs (when high) or are latched (when low).
- What are the package options available for the SN74AC373N?
Package options include PDIP (N), SSOP (DB), SOIC (DW), SOP (NS), and TSSOP (PW).
- Is the SN74AC373N RoHS compliant?
Yes, the SN74AC373N is RoHS compliant.
