Overview
The MC74LVX4245 is a dual-supply, octal translating transceiver designed to interface between a 5.0 V bus and a 3.0 V bus in mixed voltage environments. This device is particularly useful in systems such as laptop computers that use a 3.3 V CPU and a 5.0 V LCD display. The transceiver allows for bidirectional signal voltage translation, making it an essential component for managing voltage differences in integrated circuits.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCCA (Supply Voltage A) | V | 4.5 | - | 5.5 |
| VCCB (Supply Voltage B) | V | 2.7 | - | 3.6 |
| VOHA (High-Level Output Voltage A) | V | 4.5 | - | - |
| VOHB (High-Level Output Voltage B) | V | 2.7 | - | - |
| VOLA (Low-Level Output Voltage A) | V | 0.002 | - | 0.18 |
| VOLB (Low-Level Output Voltage B) | V | 0.002 | - | 0.1 |
| tPHL (Propagation Delay A to B) | ns | 1.0 | 5.1 | 9.0 |
| tPHL (Propagation Delay B to A) | ns | 1.0 | 5.4 | 9.0 |
| tPZL (Output Enable Time OE to B) | ns | 1.0 | 6.5 | 10.5 |
| tPZL (Output Enable Time OE to A) | ns | 1.0 | 5.2 | 9.5 |
Key Features
- Dual-supply operation: Interfaces between 5.0 V and 3.0 V buses.
- Octal translating transceiver: Allows for bidirectional signal translation.
- 3-State outputs: Outputs can be placed in a high-impedance state.
- Low power consumption: Suitable for power-sensitive applications.
- Wide operating temperature range: From -40°C to +85°C.
Applications
The MC74LVX4245 is ideal for use in mixed voltage systems such as:
- Laptop computers with 3.3 V CPUs and 5.0 V LCD displays.
- Other mixed voltage environments requiring signal translation.
- Embedded systems where voltage compatibility is crucial.
Q & A
- What is the primary function of the MC74LVX4245?
The MC74LVX4245 is a dual-supply, octal translating transceiver designed to interface between 5.0 V and 3.0 V buses. - What are the supply voltage ranges for VCCA and VCCB?
VCCA: 4.5 V to 5.5 V, VCCB: 2.7 V to 3.6 V. - How does the device manage output states?
The device has 3-State outputs that can be disabled by setting the Output Enable (OE) input high. - What determines the direction of data flow?
The Transmit/Receive (T/R) input determines the direction of data flow. - What is the operating temperature range of the MC74LVX4245?
The operating temperature range is from -40°C to +85°C. - Is the MC74LVX4245 suitable for new designs?
No, the MC74LVX4245 is discontinued and not recommended for new designs. - What are some typical applications of the MC74LVX4245?
Laptop computers, embedded systems, and other mixed voltage environments. - How many pins does the MC74LVX4245 have?
The MC74LVX4245 has 24 pins. - What are the propagation delays for the MC74LVX4245?
Propagation delays range from 1.0 ns to 9.0 ns depending on the direction and conditions. - What is the maximum output current for the MC74LVX4245?
The maximum output current varies but can be up to 24 mA for certain conditions.
