Overview
The MC74HC245ADWR2, produced by onsemi, is a high-performance silicon-gate CMOS octal 3-state noninverting bus transceiver. This device is identical in pinout to the LS245 and is designed for 2-way asynchronous communication between data buses. It features an active-low Output Enable pin that places the I/O ports into high-impedance states, and a Direction control that determines the data flow direction between the two buses (A to B or B to A).
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC (DC Supply Voltage) | 2.0 | 6.0 | V |
| VIN, VOUT (DC Input, Output Voltage) | 0 | VCC | V |
| TA (Operating Free-Air Temperature) | -55 | 125 | °C |
| tr, tf (Input Rise or Fall Time) | 0 | 1000 ns (VCC = 2.0 V), 500 ns (VCC = 4.5 V), 400 ns (VCC = 6.0 V) | ns |
| VIH (Minimum High-Level Input Voltage) | 1.5 | 4.2 | V |
| VIL (Maximum Low-Level Input Voltage) | 0.5 | 1.8 | V |
| VOH (Minimum High-Level Output Voltage) | 1.9 | 5.9 | V |
| IIN (Low Input Current) | 1 | 1 | μA |
Key Features
- Output Drive Capability: 15 LSTTL Loads
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Operating Voltage Range: 2.0 to 6.0 V
- Low Input Current: 1 μA
- High Noise Immunity Characteristic of CMOS Devices
- In Compliance with the Requirements Defined by JEDEC Standard No. 7A
- Chip Complexity: 308 FETs or 77 Equivalent Gates
- Pb-Free Packages are Available
- AEC-Q100 Qualified and PPAP Capable for automotive and other applications requiring unique site and control change requirements
Applications
The MC74HC245ADWR2 is versatile and can be used in various applications, including:
- 2-way asynchronous communication between data buses
- Level conversion for interfacing TTL or NMOS outputs to high-speed CMOS inputs
- Automotive systems due to its AEC-Q100 qualification
- Industrial, communications, computing, and consumer electronics where high noise immunity and low power consumption are critical
Q & A
- What is the primary function of the MC74HC245ADWR2?
The MC74HC245ADWR2 is a 3-state noninverting bus transceiver used for 2-way asynchronous communication between data buses.
- What is the operating voltage range of the MC74HC245ADWR2?
The operating voltage range is from 2.0 to 6.0 V.
- How does the Output Enable pin function?
The Output Enable pin is active-low and is used to place the I/O ports into high-impedance states.
- What types of outputs can the MC74HC245ADWR2 interface with?
The outputs can directly interface with CMOS, NMOS, and TTL.
- What is the significance of the Direction control?
The Direction control determines whether data flows from Bus A to Bus B or from Bus B to Bus A.
- Is the MC74HC245ADWR2 compliant with any industry standards?
Yes, it is in compliance with the requirements defined by JEDEC Standard No. 7A.
- What is the chip complexity of the MC74HC245ADWR2?
The chip complexity is 308 FETs or 77 equivalent gates.
- Is the MC74HC245ADWR2 suitable for automotive applications?
Yes, it is AEC-Q100 qualified and PPAP capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- What is the input current characteristic of the MC74HC245ADWR2?
The device has a low input current of 1 μA.
- Does the MC74HC245ADWR2 have any special packaging options?
Yes, Pb-Free packages are available.
