16Mbit Enhanced SDRAM Family
4Mx4, 2Mx8, 1Mx16
Product Brief
Features
•
100% Pin, Function, and Timing Compatible with
JEDEC standard SDRAM
•
Integrated 8Kbit SRAM Row Cache
•
Synchronous Operation up to 150MHz
•
24ns Row Access Latency, 11ns Column Latency
•
Early Auto-Precharge
•
Programmable Burst Length (1, 2, 4, 8, full page)
•
Programmable CAS Latency (1, 2, 3)
•
•
•
•
•
•
Hidden Auto-Refresh without closing Read Pages
Low Power Suspend, Self-Refresh, and Power Down Modes
Optional No Write Transfer Mode
Single 3.3V Power Supply
Flexible V
DDQ
Supports LVTTL and 2.5V I/O
Packages: 44-pin TSOP-II (400 mils wide)
50-pin TSOP-II (400 mils wide)
Description
The Enhanced Memory Systems 16Mb enhanced
SDRAM (ESDRAM) family combines raw speed with
innovative architecture to optimize system price-
performance in high performance computer and
embedded control systems.
The ESDRAM is pin compatible with JEDEC standard
SDRAM. It is also function and timing compatible with
JEDEC standard SDRAM.
The two bank architecture combines 24ns DRAM arrays
with a 11ns SRAM row cache per bank. The ESDRAM is a
superset technology of JEDEC standard SDRAM. Its two
key functional features include early auto-precharge (close
DRAM page while burst reads are performed) and an
optional No Write Transfer mode. The ESDRAM is capable
of maintaining two open read pages and two open write
pages simultaneously via the No Write Transfer mode.
FUNCTIONAL BLOCK DIAGRAM
ADDRESS BUFFERS
ROW DECODER
BANK A
8Mbit
BANK B
8Mbit
A(11:0)
DATA LATCHES
SENSE AMPLIFIERS
SENSE AMPLIFIERS
SRAM ROW CACHE
COLUMN DECODER
SRAM ROW CACHE
COLUMN DECODER
CLK
CKE
/CS
/RAS
/CAS
/WE
DQM(1:0)
COMMAND
DECODER
and
TIMING
GENERATOR
DATA LATCHES
DQ
Product
4Mx4
2Mx8
1Mx16
Cache Size
1Kx4
512x8
256x16
The information contained herein is subject to change without notice.
Enhanced reserves the right to change or discontinue this product
without notice.
©
1999 Enhanced Memory Systems Inc.
1850 Ramtron Drive, Colorado Springs, CO 80921
Telephone
(800) 545-DRAM,
Fax
(719) 488-9095,
Web
http://www.edram.com
Rev. 2.4
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
