AL440B

AL440B

November 28, 2001

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1.0 Description

The AL440B 4Mbits (512k x 8-bit) FIFO memory provides completely independent 8bit input and

output ports that can operate at a maximum speed of 80 MHz. The built-in address and pointer

control circuits provide a very easy-to-use memory interface that greatly reduces design time and

effort. Manufactured using state-of-the-art embedded high density memory cell array, the AL440B

uses high performance process technologies with extended controller functions (write mask, read

skip.. etc.), allowing easy operation of non-linearity and regional read/write FIFO for PIP, Digital

TV, security system and video camera applications.

The status flags can be used to indicate

Fullness/Emptiness of the FIFO and also allow multiple cascading AL440Bs to expand the storage

depth or provide a longer delay, which cannot be achieved with only a single device. Expanding

AL440B data bus width is also possible by using multiple AL440B chips in parallel. To get better

design flexibility, the polarities of the AL440B control signals are selectable. The read and write

control signals, such as Read/Write Enable, Input/Output Enable.., can be either active low or high

by pulling /PLRTY signal to high or low respectively. In AL440B, Window data write/read and

data mirroring functions can offer better control assistance in the application design. The built-in

registers set can be easily programmed via serial bus (I2C like control bus) to perform various

useful functions such as multi-freeze, P-in-P in the digital TV, VCR, and video camera application.

Available as a 44-pin TSOP (II), the small footprint allows product designers to keep real estate to a

minimum.

2.0 Features

• 4Mbits (512k x 8 bits) organization FIFO

• Independent 8bit read/write port operations

(different read/write data rates acceptable)

• Maximum Read/write cycle time: 80Mhz

and 40Mhz (2 speed grades)

• Input Enable (write mask) / Output Enable

(data skipping) control

• Window read/write with Mirroring capable

• Selectable control signal polarity

• Input Ready / Output Ready flags

• Direct cascade connection

• Self refresh

• 3.3V ± 10% power supply

• Standard 44-pin TSOP (II) package

3.0 Applications

• Multimedia systems

• Video capture or editing systems for

NTSC/PAL or SVGA resolution

• Security systems

• Scan rate converters

• PIP (Picture-In-Picture) video display

• TBC (Time Base Correction)

• Frame synchronizer

• Digital video camera

• Hard disk cache memory

• Buffer for communication systems

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• DTV/HDTV video stream buffer

4.0 Ordering Information

The AL440B has two speed grades, AL440B-24 and AL440B-12, which can operate at frequencies

of 40MHz and 80MHz respectively. Both speed grades are powered by 3.3V and are available in a

44-pin standard TSOP-II package.