LM1882 Datasheet | National Semiconductor

LM1882- 54ACT715- LM1882-R- 54ACT715-R Programmable Video Sync Generator December 1998 LM1882- 54ACT715 LM1882-R- 54ACT715-R Programmable Video Sync Generator General Description The ’ACT715/LM1882 and ’ACT715-R/LM1882-R are 20-pin TTL-input patible devices capable of generating Horizontal, Vertical and posite Sync and Blank signals for televisions and monitors. All pulse widths are pletely definable by the user. The devices are capable of generating signals for both interlaced and noninterlaced modes of operation. Equalization and serration pulses can be introduced into the posite Sync signal when needed. Four additional signals can also be made available when posite 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 registers, the status register, and the input clock frequency. The ’ACT715/LM1882 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/LM1882-R is the same as the ’ACT715/ LM1882 in all respects except that the ’ACT715-R/ LM1882-R is mask programmed to default to a Clock Enabled state. Bit 10 of the Status Register defaults to a logic “1”. Although pletely (re)programmable, the ’ACT715-R/ LM1882-R version is better suited for applications using the default 14.31818 MHz RS-170 register values. This feature allows power-up directly into operation, following a single CLEAR pulse. Features n Maximum Input Clock Frequency > 130 MHz n Interlaced and...