| Parameters | 
                                                                                                            
                                            | Mounting Type | Surface Mount | 
                                                                            
                                            | Package / Case | 128-LQFP | 
                                                                            
                                            | Supplier Device Package | 128-TQFP (14x20) | 
                                                                            
                                            | Operating Temperature | 0°C~70°C | 
                                                                            
                                            | Packaging | Tape & Reel (TR) | 
                                                                            
                                            | Series | 7200 | 
                                                                            
                                            | Part Status | Obsolete | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 
                                                                            
                                            | Voltage - Supply | 4.5V~5.5V | 
                                                                            
                                            | Base Part Number | 723646 | 
                                                                            
                                            | Function | Synchronous | 
                                                                            
                                            | Current - Supply (Max) | 400mA | 
                                                                            
                                            | Memory Size | 72k 1k x 36 x 2 | 
                                                                            
                                            | Access Time | 8ns | 
                                                                            
                                            | Data Rate | 83MHz | 
                                                                            
                                            | Retransmit Capability | No | 
                                                                            
                                            | FWFT Support | Yes | 
                                                                            
                                            | Programmable Flags Support | Yes | 
                                                                            
                                            | Expansion Type | Depth, Width | 
                                                                            
                                            | RoHS Status | Non-RoHS Compliant | 
                                                                                                    
                            
                         
                                                723646L12PF8 Overview
You will find FIFO memory chip in the 128-LQFP package.You'll find it packaged in the shape of a Tape & Reel (TR) .A memory of 72k 1k x 36 x 2 is available for storing applications and data on this FIFO chip.Regulating the temperature to 0°C~70°C ensures reliable operation.Mounting type Surface Mount indicates that the FIFO memory is mounted.A 4.5V~5.5V supply voltage is required to power it.It belongs to the 7200 series of memory logics.There is a FIFO's maximum operating supply current of 400mA .I believe it belongs to the 723646 family of numbers.
723646L12PF8 Features
72k 1k x 36 x 2 memory size
7200 series
Best part number of 723646
723646L12PF8 Applications
There are a lot of Renesas Electronics America Inc. 723646L12PF8  FIFOs Memory applications. 
- Portable Information Devices
- General Data Collection Applications at Extreme High-Temperatures
- Video time base correction
- HDD
- Video Processing
- Data 
- Consumer Systems
- TVs
- Firmware loaders
- Microprogramming