tm

April 2007

©1988 Fairchild Semiconductor Corporation

www.fairchildsemi.com

74ACT715, 74ACT715-R Rev. 1.3

74ACT715, 74ACT715-R

Programmable Video Sync Generator

Features

> 130MHz

and Blank signals available

programming

registers

Enable state for easier start-up into 14.31818MHz

RS170 timing

General Description

The ACT715 and ACT715-R are 20-pin TTL-input

compatible devices capable of generating Horizontal,

Vertical and Composite Sync and Blank signals for tele-

visions and monitors. All pulse widths are completely

definable by the user. The devices are capable of gener-

ating signals for both interlaced and noninterlaced

modes of operation. Equalization and serration pulses

can be introduced into the Composite Sync signal when

needed.

Four additional signals can also be made available when

Composite Sync or Blank are used. These signals can

be used to generate horizontal or vertical gating pulses,

cursor position or vertical Interrupt signal.

These devices make no assumptions concerning the

system architecture. Line rate and field/frame rate are all

a function of the values programmed into the data regis-

ters, the status register, and the input clock frequency.

The ACT715 is mask programmed to default to a Clock

Disable state. Bit 10 of the Status Register, Register 0,

defaults to a logic “0”. This facilitates (re)programming

before operation.

The ACT715-R is the same as the ACT715 in all

respects except that the ACT715-R is mask pro-

grammed to default to a Clock Enabled state. Bit 10 of

the Status Register defaults to a logic “1”. Although

completely (re)programmable, the ACT715-R version is

better

suited

for

applications

using

the

default

14.31818MHz RS-170 register values. This feature

allows power-up directly into operation, following a single

CLEAR pulse.

Ordering Information

Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.

Order Number

Package

Number

Package Description

74ACT715SC

M20B

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

74ACT715-RSC

M20B

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

FACT™ is a trademark of Fairchild Semiconductor Corporation.