Overview
The MC74VHC245, produced by onsemi, is an advanced high-speed CMOS octal bus transceiver fabricated with silicon gate CMOS technology. This device is designed for two-way asynchronous communication between data buses and is particularly useful in applications requiring high speed and low power dissipation. It operates within a voltage range of 2 V to 5.5 V, making it versatile for various system designs. The MC74VHC245 is pin and function compatible with other standard logic families, ensuring ease of integration into existing systems.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| Propagation Delay (tPD) | 4.0 ns (Typ) | ns | VCC = 5 V |
| Power Dissipation (ICC) | 4 μA (Max) | μA | TA = 25°C |
| Noise Immunity (VNIH, VNIL) | 28% VCC | % VCC | |
| Operating Voltage Range | 2 V to 5.5 V | V | |
| Output Low Voltage (VOLP) | 1.2 V (Max) | V | |
| ESD Performance (HBM) | > 2000 V | V | |
| ESD Performance (Machine Model) | > 200 V | V | |
| Latchup Performance | > 300 mA | mA | |
| Package Types | SOIC-20, TSSOP-20 |
Key Features
- High Speed Operation: Achieves propagation delays similar to Bipolar Schottky TTL while maintaining low CMOS power dissipation.
- Low Power Dissipation: Maximum current consumption of 4 μA at 25°C.
- High Noise Immunity: Noise immunity of 28% VCC.
- Power Down Protection: Provided on inputs to prevent damage.
- Balanced Propagation Delays: Ensures consistent signal timing.
- Wide Operating Voltage Range: Compatible with 2 V to 5.5 V systems.
- Low Noise: Quiet output maximum dynamic voltage (VOLP) of 1.2 V.
- Pin and Function Compatibility: Compatible with other standard logic families.
- ESD Protection: Human Body Model (HBM) > 2000 V and Machine Model > 200 V.
- Latchup Performance: Exceeds 300 mA.
- Pb-Free and RoHS Compliant: Environmentally friendly packaging.
Applications
- Two-way asynchronous communication between data buses.
- High-speed data transmission in computing and communication systems.
- Industrial control systems requiring low power and high noise immunity.
- Automotive and aerospace applications where reliability and speed are critical.
- Consumer electronics such as audio/video equipment and gaming consoles.
Q & A
- What is the typical propagation delay of the MC74VHC245?
The typical propagation delay (tPD) is 4.0 ns at VCC = 5 V.
- What is the maximum power dissipation of the MC74VHC245?
The maximum power dissipation (ICC) is 4 μA at TA = 25°C.
- What is the operating voltage range of the MC74VHC245?
The operating voltage range is from 2 V to 5.5 V.
- Does the MC74VHC245 have ESD protection?
- Is the MC74VHC245 Pb-Free and RoHS compliant?
- What are the package types available for the MC74VHC245?
The MC74VHC245 is available in SOIC-20 and TSSOP-20 packages.
- How does the direction of data transmission in the MC74VHC245 get determined?
The direction of data transmission is determined by the level of the DIR input.
- Can the MC74VHC245 be used to interface 5 V to 3 V systems directly?
No, the MC74VHC245 cannot be used to interface 5 V to 3 V systems directly due to the parasitic diode formed between the bus and VCC terminals.
- What is the latchup performance of the MC74VHC245?
The latchup performance exceeds 300 mA.
- What should be done with floating (high impedance) input or I/O pins?
Floating (high impedance) input or I/O pins must be fixed by means of pull-up or pull-down resistors or bus terminator ICs).
