Overview
The SN74ALS245A-1DWG4 is an octal bus transceiver with 3-state outputs, manufactured by Texas Instruments. This component is designed for asynchronous two-way communication between data buses, making it a versatile tool in various digital systems. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus, controlled by the direction-control (DIR) input. Additionally, the output-enable (OE) input can be used to disable the device, effectively isolating the buses.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | SN74ALS245A-1DWG4 |
| Manufacturer | Texas Instruments |
| Description | IC TXRX NON-INVERT 5.5V 20SOIC |
| Package / Case | 20-SOIC (0.295, 7.50mm Width) |
| Number of Pins | 20 |
| Operating Supply Voltage | 4.5V to 5.5V |
| Min Operating Temperature | 0°C |
| Max Operating Temperature | 70°C |
| Propagation Delay | 10 ns |
| Turn On Delay Time | 10 ns |
| Logic Function | Non-Inverting, Transceiver |
| Output Characteristics | 3-State |
| High Level Output Current | -15 mA |
| Low Level Output Current | 24 mA (48 mA for -1 version) |
| Control Type | COMMON CONTROL |
| RoHS Status | RoHS Compliant |
| Lead Free | Lead Free |
Key Features
- 3-State Outputs: The outputs can be put into high impedance mode through the OE pin, allowing for bus isolation.
- PNP Inputs: Reduces dc loading on bus lines.
- Hysteresis on Bus Inputs: Improves noise margins.
- Bidirectional Data Transmission: Data can be transmitted from A to B or from B to A depending on the DIR pin value.
- Output Enable: The OE input can disable the device, isolating the buses.
- Low Propagation Delay: 10 ns propagation delay and 10 ns turn-on delay time.
- High Output Current Capability: The -1 version supports up to 48 mA low-level output current.
Applications
- Data Communication Systems: Ideal for asynchronous two-way communication between data buses.
- Digital Circuits: Used in various digital circuits requiring bidirectional data transmission.
- Embedded Systems: Suitable for use in embedded systems where bus isolation and low power consumption are critical.
- Industrial Automation: Can be used in industrial automation systems for reliable data transmission.
Q & A
- What is the primary function of the SN74ALS245A-1DWG4?
The primary function is to enable asynchronous two-way communication between data buses.
- How is the direction of data transmission controlled?
The direction is controlled by the DIR pin, which determines whether data is transmitted from A to B or from B to A.
- What is the purpose of the OE pin?
The OE pin is used to disable the device, putting the outputs into high impedance mode and isolating the buses.
- What are the operating supply voltage and temperature ranges?
The operating supply voltage is 4.5V to 5.5V, and the operating temperature range is 0°C to 70°C.
- What is the propagation delay of the SN74ALS245A-1DWG4?
The propagation delay is 10 ns.
- Does the SN74ALS245A-1DWG4 have built-in hysteresis on bus inputs?
Yes, it has built-in hysteresis on bus inputs to improve noise margins.
- What is the maximum low-level output current for the -1 version?
The maximum low-level output current for the -1 version is 48 mA.
-
Yes, it is RoHS compliant and lead-free.
- What type of package does the SN74ALS245A-1DWG4 come in?
The component comes in a 20-SOIC package.
- What are some common applications of the SN74ALS245A-1DWG4?
Common applications include data communication systems, digital circuits, embedded systems, and industrial automation.
