Overview
The SN74HC245NSRE4, produced by Texas Instruments, is an octal bus transceiver with 3-state outputs. This device is designed 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 logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device, effectively isolating the buses. This component is part of the HC (High-Speed CMOS) logic family, known for its low power consumption and wide operating voltage range.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2 V to 6 V | V |
| Operating Temperature Range | -40°C to 85°C | °C |
| Maximum Supply Current (ICC) | 80 µA | µA |
| Input Current (II) | 1 µA (max) | µA |
| Output Drive at 5 V | ±6 mA | mA |
| Propagation Delay (tpd) | 12 ns (typical) | ns |
| Package Types | PDIP (N), SOIC (DW), SSOP (DB), SO (NS), TSSOP (PW) |
Key Features
- Wide operating voltage range of 2 V to 6 V
- High-current 3-state outputs drive bus lines directly or up to 15 LSTTL loads
- Low power consumption, with a maximum supply current of 80 µA
- Typical propagation delay of 12 ns
- ±6-mA output drive at 5 V
- Low input current of 1 µA maximum
- Output-enable (OE) input for bus isolation
- Direction-control (DIR) input for bidirectional data transmission
Applications
The SN74HC245NSRE4 is suitable for a variety of bus interface applications where low power consumption and minimal output ringing are critical. It can be used in systems requiring asynchronous two-way communication between data buses, such as:
- Microcontroller and system board interfaces
- Data transmission and reception in embedded systems
- Bus isolation and control in digital circuits
- Low-power CMOS logic circuits
Q & A
- What is the operating voltage range of the SN74HC245NSRE4?
The operating voltage range is from 2 V to 6 V.
- What is the maximum supply current of the SN74HC245NSRE4?
The maximum supply current is 80 µA.
- How does the direction-control (DIR) input function?
The DIR input determines the direction of data transmission between the A and B buses.
- What is the purpose of the output-enable (OE) input?
The OE input can be used to disable the device, effectively isolating the buses.
- What is the typical propagation delay of the SN74HC245NSRE4?
The typical propagation delay is 12 ns.
- What are the package types available for the SN74HC245NSRE4?
The available package types include PDIP (N), SOIC (DW), SSOP (DB), SO (NS), and TSSOP (PW).
- How much output drive can the SN74HC245NSRE4 provide at 5 V?
The device can provide ±6-mA output drive at 5 V.
- What is the maximum input current of the SN74HC245NSRE4?
The maximum input current is 1 µA.
- Is the SN74HC245NSRE4 suitable for low-power applications?
Yes, it is designed for low power consumption, making it suitable for low-power applications.
- Can the SN74HC245NSRE4 drive LSTTL loads?
Yes, it can drive bus lines directly or up to 15 LSTTL loads.
