256K x 4 Multiport DRAM
Documents
Description
The MSM514252A is
an 1-Mbit CMOS multiport DRAM composed of a 262,144-word by 4-bit dynamic RAM,
and a 512-word by 4-bit static serial access memory, SAM port. The RAM port and
SAM port operate independently and asynchronously.
The MSM514252A supports three types of operations: random access to and from
the RAM port, high speed serial access to and from the SAM port and
bidirectional transfer of data between any selected row in the RAM port and the
SAM port. The RAM port and the SAM port can be accessed independently except
when data is being transferred between them internally.
Features
| » |
Single power supply of 5 V ±10% with a built-in VBB
generator |
| » |
All inputs and outputs: TTL compatible |
| » |
Multiport organization
| » |
RAM port: 256K word x 4 bits |
| » |
SAM port: 512 word x 4 bits
| |
| » |
RAM port
| » |
Fast page mode, Read-modify-write |
| » |
*CAS before *RAS refresh, Hidden refresh |
| » |
*RAS only refresh, Standard write-per-bit
| |
| » |
SAM port
| » |
High speed serial |
| » |
Read / Write capability |
| » |
Fully static register |
| » |
512 tap location | |
| » |
RAM-SAM bidirectional, Read / Write / Pseudo write, Real time
read transfer |
| » |
Package options:
| » |
28-pin 400 mil plastic ZIP (ZIP28-P-400-1.27)
(Product :
MSM514252A-xxZS) |
| » |
28-pin 400 mil plastic SOJ (SOJ28-P-400-1.27)
(Product :
MSM514252A-xxJS) |
| » |
xx indicates speed rank.
| |
