Overview
The SN74HC245DWRE4, produced by Texas Instruments, is an octal bus transceiver with 3-state outputs. This integrated circuit is designed for asynchronous two-way communication between data buses, making it versatile for various digital system applications. The device allows data transmission from the A bus to the B bus or from the B bus to the A bus, controlled by the direction-control (DIR) input. Additionally, the output-enable (OE) input can isolate the buses when necessary.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 2 V) | 1.5 | V | ||
| VIH High-Level Input Voltage (VCC = 4.5 V) | 3.15 | V | ||
| VIH High-Level Input Voltage (VCC = 6 V) | 4.2 | V | ||
| VIL Low-Level Input Voltage (VCC = 2 V) | 0.5 | V | ||
| VIL Low-Level Input Voltage (VCC = 4.5 V) | 1.35 | V | ||
| VIL Low-Level Input Voltage (VCC = 6 V) | 1.8 | V | ||
| TA Operating Free-Air Temperature | -40 | 85 | °C | |
| tpd Propagation Delay (A or B to B or A) at VCC = 5 V | 18 | 27 | 40 | ns |
| IO Continuous Output Current | ±35 | mA |
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 ICC of 80 µA
- Typical propagation delay of 12 ns
- ±6-mA output drive at 5 V
- Low input current of 1 µA maximum
- Control-function implementation minimizes external timing requirements
- Output-enable (OE) input for bus isolation
Applications
The SN74HC245DWRE4 is suitable for a variety of bus interface applications where output ringing is a concern. It can be used in systems requiring asynchronous two-way communication between data buses. Typical applications include:
- Interface between microcontrollers and other system boards
- Driving LEDs, relays, or other loads
- Bus communication in digital systems where low drive and slow edge rates are necessary to minimize overshoot and undershoot
Q & A
- What is the operating voltage range of the SN74HC245DWRE4?
The operating voltage range is from 2 V to 6 V
- What is the maximum propagation delay at VCC = 5 V?
The maximum propagation delay is 40 ns
- How many LSTTL loads can the 3-state outputs drive?
The 3-state outputs can drive up to 15 LSTTL loads
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can be used to disable the device and isolate the buses
- What is the typical power consumption of the SN74HC245DWRE4?
The typical power consumption is 80 µA maximum
- What is the operating temperature range of the SN74HC245DWRE4?
The operating temperature range is from -40°C to 85°C
- Can the SN74HC245DWRE4 be used for driving LEDs or relays?
Yes, it can be used for driving LEDs, relays, or other loads
- How does the SN74HC245DWRE4 minimize external timing requirements?
The control-function implementation minimizes external timing requirements
- What is the maximum continuous output current of the SN74HC245DWRE4?
The maximum continuous output current is ±35 mA
- Is the SN74HC245DWRE4 compliant with any military standards?
Yes, it is compliant with MIL-PRF-38535 for certain parameters
