74LVXC4245WM

Translators, Level Shifters Overview

The onsemi 74LVXC4245WM is an 8-bit dual-supply configurable voltage interface transceiver with 3-STATE outputs. It operates with a fixed VCCA of 4.5V to 5.5V and a flexible VCCB range of 2.7V to 5.5V. The device provides bidirectional data transfer between the A and B ports, controlled by OE and T/R inputs. It features TTL-compatible control inputs and outputs capable of sourcing or sinking up to 24 mA. Propagation delays typically range from 1.0 ns to 8.0 ns depending on supply conditions. The component is housed in a 24-lead SOIC package.

Translators, Level Shifters Feature Summary

• Configurable voltage interface allowing the B Port to track the VCCB supply level for seamless translation between 5V and 3V-to-5V buses.
• Allows the B Port and VCCB pin to float simultaneously when the Output Enable (OE) input is HIGH, supporting hot-swappable applications.
• Implements patented EMI reduction circuitry to minimize simultaneous switching noise and ensure dynamic threshold performance.
• Functionally compatible with standard 74 series 245 devices while offering enhanced low-power operation.

Translators, Level Shifters Applications

• PCMCIA and other real-time configurable I/O applications
• Bidirectional interface between 5V and 3V-to-5V buses
• Low power notebook designs requiring bus buffering

Translators, Level Shifters Procurement Notes

Verify the specific ordering suffix to confirm the package type, as the base part number may correspond to different physical packages such as SOIC, QSOP, or TSSOP. Confirm that the VCCA supply is strictly maintained at 5V levels, as this is required for internal references. Ensure unused A port pins are tied to valid logic levels during operation to prevent floating states. Check current availability status as distribution channels may vary.

Translators, Level Shifters Selection Notes

Select this component when a dual-supply translator is required to bridge 5V systems with variable 3V-to-5V peripherals. It is specifically suited for applications where the peripheral voltage rail may change or float, such as PCMCIA sockets. Ensure the design can accommodate the requirement for VCCA to be powered before VCCB to prevent bus contention during power-up sequences.

Translators, Level Shifters Part Context

This device belongs to the LVXC family of low-voltage CMOS transceivers designed for dual-supply operations. It serves as a bridge between different voltage domains within a single system. The 'WM' suffix specifically denotes the 24-Lead Small Outline Integrated Circuit (SOIC) package variant manufactured under the Fairchild Semiconductor lineage now integrated into ON Semiconductor.

Translators, Level Shifters Replacement Considerations

SN74LVCC4245ADWR

Translators, Level Shifters FAQ

Can the B Port and VCCB pin float?

Yes, the device allows the B Port and VCCB pin to float simultaneously when the Output Enable (OE) input is HIGH. This feature is necessary for applications like PCMCIA sockets that permit card insertion and removal during normal operation.

What are the power-up sequencing requirements?

To prevent bus contention, VCCA must be powered up first. The OE and T/R control pins should ramp with or ahead of VCCA. Unused A side data inputs must be driven to a valid logic level to prevent excessive current draw.