Octal Bus Transceivers The SN74ALS638A-1N is a 3-state octal bus transceiver and register manufactured by Texas Instruments (TI). Here are its specifications, descriptions, and features:
### **Specifications:**
- **Logic Type:** Octal Bus Transceiver and Register
- **Technology:** Advanced Low-Power Schottky (ALS)
- **Supply Voltage:** 4.5V to 5.5V
- **Operating Temperature Range:** 0°C to 70°C
- **Package Type:** PDIP (Plastic Dual In-Line Package)
- **Pin Count:** 20
- **Output Type:** 3-State
- **Propagation Delay:** Typically 9ns (max 15ns)
- **Current - Output High, Low:** 15mA, 24mA
- **Mounting Type:** Through Hole
### **Descriptions:**
The SN74ALS638A-1N combines an 8-bit D-type register with an octal bus transceiver in a single device. It features bidirectional data flow controlled by the direction (DIR) input and output enable (OE) signals. Data can be stored in the register on the rising edge of the clock (CLK) input.
### **Features:**
- **Bidirectional Data Flow:** Controlled by DIR and OE inputs.
- **3-State Outputs:** Allows connection to a bus-organized system.
- **Registered Data Path:** Latches data on the rising edge of CLK.
- **Wide Operating Voltage:** 4.5V to 5.5V.
- **Low Power Consumption:** Typical ICC of 45mA.
- **High-Speed Operation:** Propagation delay of 9ns (typical).
- **ESD Protection:** Exceeds 2000V per JESD 22-A114.
This information is based on TI's official datasheet for the SN74ALS638A-1N.
