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  NEC Electronic Components Datasheet  


MC-45D32CC721

32 M-WORD BY 72-BIT DDR SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE


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PRELIMINARY DATA SHEET
MOS INTEGRATED CIRCUIT
MC-45D32CC721
32 M-WORD BY 72-BIT DDR SYNCHRONOUS DYNAMIC RAM MODULE
UNBUFFERED TYPE
Description
The MC-45D32CC721 is a 33,554,432 words by 72 bits DDR synchronous dynamic RAM module on which 18
pieces of 128M DDR SDRAM: µPD45D128842 are assembled.
These modules provide high density and large quantities of memory in a small space without utilizing the surface-
mounting technology on the printed circuit board.
Decoupling capacitors are mounted on power supply line for noise reduction.
Features
33,554,432 words by 72 bits organization (ECC type)
Clock frequency
Part number
/CAS latency
Clock frequency
(MAX.)
Module type
MC-45D32CC721KFA-C75
CL = 2.5
133 MHz
DDR SDRAM
CL = 2
100 MHz
Unbuffered DIMM
MC-45D32CC721KFA-C80
CL = 2.5
125 MHz
Design specification
CL = 2
100 MHz
Rev.0.9 compliant
Fully Synchronous Dynamic RAM with all signals except DM, DQS and DQ referenced to a positive clock edge
Double Data Rate interface
Differential CLK (/CLK) input
Data inputs and DM are synchronized with both edges of DQS
Data outputs and DQS are synchronized with a cross point of CLK and /CLK
Quad internal banks operation
Possible to assert random column address in every clock cycle
Programmable Mode register set
/CAS latency (2, 2.5)
Burst length (2, 4, 8)
Wrap sequence (Sequential / Interleave)
Automatic precharge and controlled precharge
CBR (Auto) refresh and self refresh
2.5 V ± 0.2 V Power supply for VDD
2.5 V ± 0.2 V Power supply for VDDQ
SSTL_2 compatible with all signals
4,096 refresh cycles / 64 ms
Burst termination by Precharge command and Burst stop command
184-pin dual in-line memory module (Pin pitch = 1.27 mm)
Unbuffered type
Serial PD
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. M14900EJ1V0DS00 (1st edition)
Date Published June 2000 NS CP(K)
Printed in Japan
©
2000



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MC-45D32CC721
Ordering Information
Part number
Clock frequency
(MAX.)
Package
Mounted devices
MC-45D32CC721KFA-C75
133 MHz
184-pin Dual In-line Memory Module 18 pieces of µPD45D128842G5 (Rev. K)
(Socket Type)
(10.16 mm (400) TSOP (II))
MC-45D32CC721KFA-C80
125 MHz
Edge connector: Gold plated
31.75 mm height
2 Preliminary Data Sheet M14900EJ1V0DS00



Part Number MC-45D32CC721
Description 32 M-WORD BY 72-BIT DDR SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE
Maker NEC - NEC
Total Page 16 Pages
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