74ACT715RSC

Overview

The onsemi 74ACT715RSC is a programmable video sync generator in a 20-lead SOIC package. It generates horizontal, vertical, and composite sync/blank signals for interlaced and non-interlaced modes. The device features TTL-compatible inputs, an 8 mA output drive capability, and supports input clock frequencies exceeding 130 MHz. It includes mask-programmed default RS170 register values and defaults to a Clock Enabled state upon power-up.

Feature Summary

• Generates horizontal, vertical, and composite sync and blank signals with user-definable pulse widths
• Supports both interlaced and non-interlaced operation modes with equalization and serration pulses
• Mask programmed to default to a Clock Enabled state for immediate start-up into RS170 timing
• Includes scan mode for non-destructive verification of internal register contents

Applications

• Televisions and monitors requiring master sync generation
• Video controllers capable of overlaying text on external video signals
• Systems generating video output when no external source is available

Procurement Notes

Verify the specific suffix 'RSC' confirms the 20-lead Small Outline Integrated Circuit (SOIC) package and the -R designation indicating the default Clock Enabled state. Confirm that the component meets the required operating temperature range of -40°C to +85°C and supply voltage specifications of 4.5V to 5.5V before integration.

Selection Notes

Select this component when a programmable sync generator with default RS170 timing is required without initial configuration overhead. The -R variant is preferred over the standard ACT715 if automatic clock enablement after power-up is desired. Ensure the system architecture can accommodate the TTL-compatible logic levels and the asynchronous nature of the LOAD and CLOCK signals.

Part Context

This part belongs to the 74ACT family of high-speed CMOS logic devices originally manufactured by Fairchild Semiconductor. The 74ACT715 series is specifically designed as a programmable video sync generator. The RSC suffix denotes the surface-mount SOIC package variant, distinct from the PDIP package version.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.