Overview
The SN74HC245ANSR is an octal bus transceiver produced by Texas Instruments. This component is designed for asynchronous two-way communication between data buses, making it a versatile tool in various digital logic systems. It features a direction control and an active low output enable, allowing for flexible data transmission and bus isolation. The device is part of the 74HC logic family, known for its wide operating voltage range and high-current 3-state outputs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 2 | 5 | 6 | V |
| No. of Pins | 20 | |||
| Operating Temperature | -40 | 85 | °C | |
| Logic Family | 74HC | |||
| Logic Case Style | DIP, SOIC, SSOP, TSSOP | |||
| High-Level Input Voltage | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| Low-Level Input Voltage | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Output Voltage | 0 | VCC | V | |
| Propagation Delay (tpd) | 18 (VCC=4.5V), 15 (VCC=6V) | 27 (VCC=4.5V), 23 (VCC=6V) | 40 (VCC=4.5V), 34 (VCC=6V) | ns |
Key Features
- Wide Operating Voltage Range: The device operates from 2 V to 6 V, making it versatile for various power supply conditions.
- High-Current 3-State Outputs: Capable of driving up to 15 LSTTL loads directly.
- Direction Control and Output Enable: Allows data transmission from the A bus to the B bus or vice versa, with an active low output enable for bus isolation.
- Low Power Consumption: Maximum static supply current of 80 µA.
- Center VCC and GND Pin Configuration: Minimizes high-speed switching noise.
- TTL-Voltage Compatible Inputs: Ensures compatibility with TTL logic systems.
Applications
The SN74HC245ANSR is commonly used in various digital logic systems for isolation and increasing drive strength. It is suitable for applications requiring asynchronous two-way communication between data buses, such as in microprocessor systems, data acquisition systems, and other digital circuits where bus isolation and direction control are necessary.
Q & A
- What is the primary function of the SN74HC245ANSR? The primary function is to facilitate asynchronous two-way communication between data buses.
- What is the operating voltage range of the SN74HC245ANSR? The device operates from 2 V to 6 V.
- How many pins does the SN74HC245ANSR have? It has 20 pins.
- What are the key control inputs on the SN74HC245ANSR? The key control inputs are the direction control (DIR) and the output enable (OE).
- Can the SN74HC245ANSR drive multiple LSTTL loads? Yes, it can drive up to 15 LSTTL loads.
- What is the maximum static supply current of the SN74HC245ANSR? The maximum static supply current is 80 µA.
- Is the SN74HC245ANSR RoHS compliant? Yes, it is RoHS compliant.
- What are the typical propagation delays for the SN74HC245ANSR? The typical propagation delays are around 18 ns to 27 ns depending on the supply voltage.
- How does the SN74HC245ANSR minimize high-speed switching noise? It minimizes high-speed switching noise through its center VCC and GND pin configuration.
- Are the inputs of the SN74HC245ANSR TTL-voltage compatible? Yes, the inputs are TTL-voltage compatible.
