GENERAL DESCRIPTION
The MS81V04166 is a single-chip 4Mb FIFO functionally composed of two Oki’s 2Mb FIFO (First-In First-Out) memories which were designed for 256k ×8-bit high-speed asynchronous read/write operation.
The read clock of each of the 2Mb FIFO memories is connected in common, and the clocks are provided
independently of each of the FIFO memories. The MS81V04166 functionally compatible with Oki’s 2Mb FIFO memory (MSM51V8222A), can be used as a ×16 configuration FIFO.

FEATURES
• 512 rows ×512 columns ×8 bits ×2
• Fast FIFO (First-In First-Out) Operation: 25 ns cycle time
• Self refresh (No refresh control is required)
• High speed asynchronous serial access
Read/Write Cycle Time 25 ns/30 ns/40 ns
Access Time 23 ns/30 ns/35 ns
• Variable length delay bit (600 to 262215)
• Write mask function (Output enable control)
• Cascading capability by mode setting
• Single power supply: 3.3 V ±10%
• Package:
   100-Pin plastic TQFP (TQFP 100-P-1414-0.50-k) (Product: MS81V04166-xxTB)
                                                                  xx indicates speed rank.