Overview
The SN74ALS645ADW is an octal bus transceiver with 3-state outputs, designed and manufactured by Texas Instruments. This device is optimized for asynchronous two-way communication between data buses, allowing data transmission from the A bus to the B bus or vice versa, based on the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device, effectively isolating the buses. The SN74ALS645ADW is available in a 20-pin plastic small-outline (DW) package and is characterized for operation from 0°C to 70°C, making it suitable for a variety of industrial and commercial applications.
Key Specifications
| Parameter | Unit | Min | Nom | Max |
|---|---|---|---|---|
| Supply Voltage (VCC) | V | 4.5 | 5 | 5.5 |
| High-Level Input Voltage (VIH) | V | 2 | ||
| Low-Level Input Voltage (VIL) | V | 0.8 | ||
| High-Level Output Current (IOH) | mA | -12 | -15 | |
| Low-Level Output Current (IOL) | mA | 48 | 64 | |
| Operating Free-Air Temperature (TA) | °C | 0 | 70 | |
| Storage Temperature Range | °C | -65 | 150 |
Key Features
- Bidirectional bus transceivers in high-density 20-pin packages.
- True logic operation.
- 3-state outputs for bus isolation.
- Package options include plastic small-outline (DW), ceramic chip carriers (FK), and standard plastic (N) and ceramic (J) 300-mil DIPs.
- Direction-control (DIR) input to determine data transmission direction.
- Output-enable (OE) input to disable the device and isolate the buses.
Applications
- Asynchronous two-way communication between data buses in various digital systems.
- Data transmission and reception in microprocessor and microcontroller systems.
- Bus isolation and control in complex digital circuits.
- Industrial and commercial applications requiring reliable and efficient data bus management.
Q & A
- What is the primary function of the SN74ALS645ADW?
The primary function of the SN74ALS645ADW is to facilitate asynchronous two-way communication between data buses, allowing data transmission from the A bus to the B bus or vice versa.
- What are the package options available for the SN74ALS645ADW?
The SN74ALS645ADW is available in plastic small-outline (DW), ceramic chip carriers (FK), and standard plastic (N) and ceramic (J) 300-mil DIP packages.
- What is the operating temperature range for the SN74ALS645ADW?
The SN74ALS645ADW is characterized for operation from 0°C to 70°C.
- How does the direction-control (DIR) input work?
The direction-control (DIR) input determines the direction of data transmission between the A and B buses. A low level on DIR transmits data from the B bus to the A bus, while a high level transmits data from the A bus to the B bus.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can be used to disable the device, effectively isolating the buses.
- What are the maximum and minimum supply voltage values for the SN74ALS645ADW?
The supply voltage (VCC) for the SN74ALS645ADW ranges from 4.5 V to 5.5 V.
- What is the maximum low-level output current (IOL) for the SN74ALS645ADW?
The maximum low-level output current (IOL) for the SN74ALS645ADW is 64 mA.
- Can the SN74ALS645ADW operate in military temperature ranges?
No, the SN74ALS645ADW is not characterized for operation over the full military temperature range. Instead, it operates from 0°C to 70°C.
- What is the storage temperature range for the SN74ALS645ADW?
The storage temperature range for the SN74ALS645ADW is from -65°C to 150°C.
- Is the SN74ALS645ADW RoHS compliant?
