Overview
The SN74HCT245DBR is an octal bus transceiver with 3-state outputs, designed by Texas Instruments. This device is optimized for asynchronous two-way communication between data buses, making it a versatile component in various electronic systems. It features a direction control and an active low output enable, allowing for flexible data transmission and bus isolation. The SN74HCT245DBR is part of the 74HCT series, which is known for its compatibility with TTL (Transistor-Transistor Logic) voltage levels and its ability to operate within a voltage range of 4.5 V to 5.5 V, making it suitable for a wide range of applications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Voltage Range | 4.5 | 5.5 | V | ||
| Supply Current (ICC) | TA = 25°C, VCC = 5.5 V | 80 | µA | ||
| Propagation Delay (tpd) | CL = 50 pF, VCC = 5 V | 14 | 20 | 30 | ns |
| Output Drive | VCC = 5 V | ±6 | mA | ||
| Input Current | VI = VCC or 0, TA = 25°C | ±1 | µA | ||
| Off-State Output Current (IOZ) | VO = VCC or 0, TA = 25°C | ±0.5 | µA | ||
| Junction-to-Ambient Thermal Resistance (RθJA) | DB Package | 94.9 | °C/W |
Key Features
- Operating voltage range of 4.5 V to 5.5 V, making it forgiving 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 Systems
- Telecom Infrastructure
Q & A
- What is the operating voltage range of the SN74HCT245DBR?
The operating voltage range is from 4.5 V to 5.5 V.
- What is the maximum static supply current of the SN74HCT245DBR?
The maximum static supply current is 80 µA.
- How many LSTTL loads can the outputs of the SN74HCT245DBR drive?
The outputs can drive up to 15 LSTTL loads.
- What is the typical propagation delay of the SN74HCT245DBR?
The typical propagation delay is 14 ns.
- Are the inputs of the SN74HCT245DBR TTL-voltage compatible?
- What is the purpose of the direction control and output enable inputs?
The direction control input determines the direction of data transmission (A bus to B bus or B bus to A bus), and the output enable input can be used to disable the device and isolate the buses.
- What are some common applications of the SN74HCT245DBR?
Common applications include factory automation, grid infrastructure, electronic point of sale, multi-function printers, motor drives, storage systems, and telecom infrastructure.
- How does the SN74HCT245DBR minimize high-speed switching noise?
The center VCC and GND pin configurations help minimize high-speed switching noise.
- What is the thermal resistance (RθJA) for the DB package of the SN74HCT245DBR?
The junction-to-ambient thermal resistance (RθJA) for the DB package is 94.9 °C/W.
- Can the SN74HCT245DBR be used in bidirectional communication?
