UPD485506 Datasheet, PDF (1/24 Pages) NEC – LINE BUFFER 5K-WORD BY 16-BIT/10K-WORD BY 8-BIT

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD485506
LINE BUFFER
5K-WORD BY 16-BIT/10K-WORD BY 8-BIT
Description
The µPD485506 is a high speed FIFO (First In First Out) line buffer. Word organization can be changed either
5,048 words by 16 bits or 10,096 words by 8 bits. Its CMOS static circuitry provides high speed access and low power
consumption.
The µPD485506 can be used for one line delay and time axis conversion in high speed facsimile machines and
digital copiers.
Moreover, the µPD485506 can execute read and write operations independently on an asynchronous basis. Thus
the µPD485506 is suitable as a buffer for data transfer between units with different transfer rates and as a buffer for
the synchronization of multiple input signals.
There are four versions, E, K, P, X and L. This data sheet can be applied to the version X and L. These versions
operate with different specifications. Each version is identified with its lot number (refer to 7. Example of Stamping).
Features
• 5,048 words by 16 bits (Word mode) /10,096 words by 8 bits (Byte mode)
• Asynchronous read/write operations available
• Variable length delay bits; 21 to 5,048 bits or 10,096 bits (Cycle time: 25 ns)
15 to 5,048 bits or 10,096 bits (Cycle time: 35 ns)
• Power supply voltage VCC = 5.0 V ±0.5 V
• Suitable for sampling two lines of A3 size paper (16 dots/mm)
• All input/output TTL compatible
• 3-state output
• Full static operation; data hold time = infinity
Ordering Information
Part Number
µPD485506G5-25-7JF
µPD485506G5-35-7JF
R/W Cycle Time
25 ns
35 ns
Package
44-pin plastic TSOP (II) (10.16 mm (400))
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for availability
and additional information.
Document No. M10060EJ7V0DSJ1 (7th edition)
Date Published December 2000 N CP(K)
The mark shows major revised points.
Printed in Japan
©
1994