Overview
The SN74HCT245DBRG4 is an octal bus transceiver with 3-state outputs, designed by Texas Instruments. This component is optimized for asynchronous two-way communication between data buses, making it a versatile tool in various electronic systems. It features a control function that minimizes external timing requirements and allows data transmission between two buses (A and B) based on the logic level at the direction-control (DIR) input. The output-enable (OE) input enables the device to be disabled, effectively isolating the buses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range | 4.5 | 5.5 | V | |
| High-Level Output Voltage (IOH = -20 µA, VCC = 4.5 V) | 4.4 | 4.499 | V | |
| Low-Level Output Voltage (IOL = 20 µA, VCC = 4.5 V) | 0.001 | 0.1 | V | |
| Input Current (VI = VCC or 0, TA = 25°C) | ±0.1 | ±100 nA | ||
| Off-State Output Current (VO = VCC or 0, TA = 25°C) | ±0.01 | ±0.5 µA | ||
| Supply Current (VI = VCC or 0, IO = 0, TA = 25°C) | 8 | 80 | µA | |
| Propagation Delay (tpd) A or B to B or A (CL = 50 pF, VCC = 5.5 V) | 14 | 25 | ns | |
| Output Drive (IOH/IOL) at 5 V | ±6 | mA |
Key Features
- Operating voltage range of 4.5 V to 5.5 V, tolerant of 5-V power supply rail accuracy.
- High-Current 3-state outputs capable of driving up to 15 LSTTL loads.
- Low power consumption with a maximum static supply current of 80 µA.
- Typical propagation delay of 14 ns and balanced output drive of ±6 mA at 5 V.
- Inputs are TTL-voltage compatible.
- Active low output enable and direction control for flexible data transmission.
- Center VCC and GND pin configurations to minimize high-speed switching noise.
Applications
- Factory Automation and Control
- Grid Infrastructure
- Electronic Point of Sale
- Multi-Function Printers
- Motor Drives
- Storage
- Telecom Infrastructure
Q & A
- What is the operating voltage range of the SN74HCT245DBRG4? The operating voltage range is from 4.5 V to 5.5 V.
- How many LSTTL loads can the outputs drive? The outputs can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HCT245DBRG4? The typical propagation delay is 14 ns.
- What is the maximum static supply current? The maximum static supply current is 80 µA.
- Are the inputs TTL-voltage compatible? Yes, the inputs are TTL-voltage compatible.
- 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.
- How does the direction-control (DIR) input function? The direction-control (DIR) input determines the direction of data transmission between the A and B buses.
- What are some common applications of the SN74HCT245DBRG4? Common applications include factory automation, grid infrastructure, electronic point of sale, multi-function printers, motor drives, storage, and telecom infrastructure.
- What is the significance of the center VCC and GND pin configurations? The center VCC and GND pin configurations help minimize high-speed switching noise.
- Can the SN74HCT245DBRG4 be used in high-speed applications? Yes, it is suitable for high-speed applications due to its balanced propagation delay and low switching times.
