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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74ALS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | Open Collector, Push-Pull |
| Current - Output High, Low | -, 24mA; 15mA, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SO |
The SN74ALS638ANS from Texas Instruments is a single-channel, inverting transceiver from the 74ALS logic family. It operates from a 4.5V to 5.5V supply, making it suitable for 5V systems. A key feature is its dual output type: Open Collector and Push-Pull, offering design flexibility for various load requirements. With a sink current of 24mA, it can drive significant loads. This device is ideal for applications requiring signal inversion and bus interfacing in industrial and commercial electronics.
- Open Collector Outputs: Enables wired-OR logic and direct driving of LEDs or relays.
- Inverting Function: Combines transceiver and inverter functions, saving board space.
- High Sink Current (24mA): Can drive heavy loads, such as multiple TTL inputs.
- Proven 74ALS Technology: Offers a reliable balance of speed and power consumption.
Wired-OR Bus Implementation
The Open Collector outputs allow for wired-OR connections, enabling multiple devices to drive a single line without contention. This is useful in interrupt lines and control signals.
Inverting Bus Transceiver
Use the SN74ALS638ANS when signal inversion is required in a bidirectional bus. This simplifies logic design by eliminating the need for external inverters.
Driving LED Indicators
The Open Collector outputs can directly drive LEDs with a pull-up resistor, making it suitable for status indication in industrial panels.
5V Logic Level Shifting
In mixed 5V systems, this transceiver can buffer and invert signals between different logic families, ensuring proper voltage levels.
Motor Control Logic
In motor control circuits, the transceiver can handle control signals, providing the necessary drive current for optocouplers or relays.
- Q: What is the logic family of the SN74ALS638ANS?
- A: It belongs to the 74ALS logic family, which uses Advanced Low-power Schottky technology for high speed and low power.
- Q: What is the function of this device?
- A: It is a single-channel, inverting transceiver for bidirectional data transfer.
- Q: What is the output type?
- A: It features both Open Collector and Push-Pull outputs, providing flexibility in driving different load types.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, compatible with standard 5V systems.
- Q: What is the output current capability?
- A: It can sink 24mA and source 15mA/24mA, depending on the output mode.
- Q: What package is available?
- A: It is available in a 20-pin SOIC (0.209", 5.30mm Width) package.
SN74ALS638ANS.pdf
- Q: What is the logic family of the SN74ALS638ANS?
- A: It belongs to the 74ALS logic family, which uses Advanced Low-power Schottky technology for high speed and low power.
- Q: What is the function of this device?
- A: It is a single-channel, inverting transceiver for bidirectional data transfer.
- Q: What is the output type?
- A: It features both Open Collector and Push-Pull outputs, providing flexibility in driving different load types.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, compatible with standard 5V systems.
- Q: What is the output current capability?
- A: It can sink 24mA and source 15mA/24mA, depending on the output mode.
- Q: What package is available?
- A: It is available in a 20-pin SOIC (0.209", 5.30mm Width) package.