SN74AHC373NSR
Octal D-type transparent latches with 3-state outputs in 20-pin SOP
Manufacturer： ['rochester', 'analog-devices', 'ti']
series introduction
# SN74AHC373NSR Product Series Introduction
## 1. Overview
The SN74AHC373NSR belongs to the SN74AHC series of integrated circuits produced by Texas Instruments. It is an octal D-type transparent latch with 3-state outputs. This product is designed to meet the requirements of various digital systems, offering high - speed operation, low power consumption, and excellent noise immunity.
## 2. Key Features
### 2.1 High - Speed Operation
- The AHC (Advanced High - Speed CMOS) technology used in the SN74AHC373NSR enables it to achieve fast propagation delays. This high - speed performance makes it suitable for applications where rapid data transfer and processing are crucial, such as in high - speed microprocessor systems, data communication interfaces, and digital signal processing circuits.
- It can operate at clock frequencies up to several tens of megahertz, allowing for efficient handling of high - speed data streams.
### 2.2 Low Power Consumption
- As a CMOS - based device, the SN74AHC373NSR consumes very low power compared to traditional TTL (Transistor - Transistor Logic) devices. This is especially important in battery - powered applications or systems where power efficiency is a top priority.
- The low power consumption also helps in reducing heat generation, which can improve the overall reliability and lifespan of the system.
### 2.3 3 - State Outputs
- The 3 - state outputs of the SN74AHC373NSR provide an additional level of flexibility in digital systems. When the output enable (OE) input is active, the latch outputs are connected to the internal data latches and can drive external loads. When the OE input is inactive, the outputs are in a high - impedance state, effectively disconnecting them from the rest of the circuit.
- This feature is useful in bus - oriented systems, where multiple devices may need to share a common data bus. By using the 3 - state outputs, different devices can be selectively enabled to communicate on the bus without interfering with each other.
### 2.4 Wide Operating Voltage Range
- The SN74AHC373NSR can operate over a wide voltage range, typically from 2 V to 5.5 V. This wide voltage tolerance allows it to be easily integrated into different types of digital systems, whether they are powered by a standard 5 V supply or a lower - voltage power source, such as a 3.3 V supply commonly used in modern microcontroller - based systems.
### 2.5 Noise Immunity
- The AHC technology provides good noise immunity, which helps in ensuring the reliability of data transfer in noisy electrical environments. The device is less susceptible to electrical noise and interference, reducing the likelihood of data errors and improving the overall performance of the system.
## 3. Pin Configuration and Functionality
### 3.1 Pinout
The SN74AHC373NSR is available in a small - outline integrated circuit (SOIC) package with 20 pins. The main pins and their functions are as follows:
- **D0 - D7**: These are the data input pins. The data to be latched is applied to these pins.
- **Q0 - Q7**: The output pins. When the latch is enabled, the data present at the input pins is transferred to these output pins.
- **LE (Latch Enable)**: When the LE input is high, the outputs follow the input data. When LE goes low, the data present at the inputs at that moment is latched and held at the outputs until the next high - to - low transition of LE.
- **OE (Output Enable)**: An active - low
Images for reference
20-SOIC
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