¡ Semiconductor
¡ Semiconductor
MSM518121A
131,072-Word
¥
8-Bit Multiport DRAM
This version: Jan. 1998
MSM518121A
Previous version: Dec. 1996
DESCRIPTION
The MSM518121A is an 1-Mbit CMOS multiport memory composed of a 131,072-words by 8-bit
dynamic random access memory, RAM port, and a 256-word by 8-bit static serial access memory,
SAM port. The RAM port and SAM port operate independently and asynchronously.
The MSM518121A supports three types of operation: 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 : 128K word
¥
8 bits
SAM port : 256 word
¥
8 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 capabillity
Fully static register
256 tap location
• RAM-SAM bidirectional, Read / Write / Pseudo write, Real time read transfer
• Package options:
40-pin 475 mil plastic ZIP
(ZIP40-P-475-1.27)
(Product : MSM518121A-xxZS)
40-pin 400 mil plastic SOJ
(SOJ40-P-400-1.27)
(Product : MSM518121A-xxJS)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM518121A-70
MSM518121A-80
MSM518121A-10
Access Time
RAM
70 ns
80 ns
100 ns
SAM
25 ns
25 ns
25 ns
Cycle Time
RAM
140 ns
150 ns
180 ns
SAM
30 ns
30 ns
30 ns
Power Dissipation
Operating
120 mA
110 mA
100 mA
Standby
8 mA
8 mA
8 mA
1/33
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