Overview
The 74HCT373DB,118 is an octal D-type transparent latch with 3-state outputs, manufactured by Nexperia USA Inc. This device is part of the 74HCT series, which operates with TTL (Transistor-Transistor Logic) input levels. It features latch enable (LE) and output enable (OE) inputs, allowing for flexible control over data storage and output states. When the LE input is HIGH, the latches are transparent, meaning the output will change each time its corresponding D-input changes. When LE is LOW, the latches store the information present at the inputs a set-up time preceding the HIGH-to-LOW transition of LE. A HIGH on the OE input causes the outputs to assume a high-impedance OFF-state without affecting the state of the latches.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Type Number | 74HCT373DB | - |
| VCC (Supply Voltage) | 4.5 - 5.5 | V |
| Logic Switching Levels | TTL | - |
| Output Drive Capability | ±6 | mA |
| Propagation Delay (tpd) | 14 | ns |
| Power Dissipation | Low | - |
| Operating Temperature Range | -40 to +125 | °C |
| Package | SSOP20 (SOT339-1) | - |
| Input Capacitance | 3.5 | pF |
| Supply Current (ICC) | 8 to 160 | μA |
Key Features
- Wide supply voltage range from 4.5 V to 5.5 V for TTL compatibility.
- CMOS low power dissipation, reducing energy consumption.
- High noise immunity, ensuring reliable operation in noisy environments.
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B, enhancing reliability.
- 3-state non-inverting outputs for bus-oriented applications, allowing for high-impedance OFF-state.
- Common 3-state output enable input (OE) for controlling output states.
- ESD protection: HBM (Human Body Model) exceeds 2000 V and CDM (Charged Device Model) exceeds 1000 V.
- Multiple package options, including SSOP20 (SOT339-1).
Applications
- Bus-oriented systems where 3-state outputs are necessary for multiplexing data lines.
- Memory and storage systems requiring transparent latches.
- Digital logic circuits where data needs to be stored and retrieved efficiently.
- Embedded systems and microcontrollers requiring low power and high noise immunity.
Q & A
- What is the primary function of the 74HCT373DB?
The primary function is to act as an octal D-type transparent latch with 3-state outputs, allowing data to be stored and controlled through latch enable and output enable inputs.
- What is the supply voltage range for the 74HCT373DB?
The supply voltage range is from 4.5 V to 5.5 V, compatible with TTL logic levels).
- What is the propagation delay of the 74HCT373DB?
The propagation delay (tpd) is approximately 14 ns).
- What are the key features of the 74HCT373DB in terms of power consumption?
The device features CMOS low power dissipation, reducing energy consumption).
- How does the output enable (OE) input affect the outputs of the 74HCT373DB?
A HIGH on the OE input causes the outputs to assume a high-impedance OFF-state without affecting the state of the latches).
- What is the operating temperature range for the 74HCT373DB?
The operating temperature range is from -40°C to +125°C).
- What type of ESD protection does the 74HCT373DB offer?
The device offers ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V).
- What are the package options available for the 74HCT373DB?
The device is available in SSOP20 (SOT339-1) package).
- How does the latch enable (LE) input control the latches in the 74HCT373DB?
When LE is HIGH, the latches are transparent, and when LE is LOW, the latches store the information present at the inputs a set-up time preceding the HIGH-to-LOW transition of LE).
- What are some common applications for the 74HCT373DB?
Common applications include bus-oriented systems, memory and storage systems, digital logic circuits, and embedded systems).
