DATA SHEET
MOS INTEGRATED CIRCUIT
MC-458CB646
8M-WORD BY 64-BIT SYNCHRONOUS DYNAMIC RAM MODULE
UNBUFFERED TYPE
Description
The MC-458CB646 is a 8,388,608 words by 64 bits synchronous dynamic RAM module on which 8 pieces of 64M
SDRAM: µPD4564841 are assembled.
This module provides 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
• 8,388,608 words by 64 bits organization
• Clock frequency and access time from CLK
Part number
/CAS latency Clock frequency Access time from CLK
Power consumption (MAX.)
(MAX.)
(MAX.)
Active
Standby
MC-458CB646F-A80
CL = 3
125 MHz
6 ns
3,888 mW
14.4 mW
CL = 2
100 MHz
6 ns
3,744 mW
(CMOS level input )
MC-458CB646F-A10
CL = 3
100 MHz
6 ns
3,888 mW
CL = 2
77 MHz
7 ns
3,744 mW
MC-458CB646LFA-A80
CL = 3
125 MHz
6 ns
3,888 mW
CL = 2
100 MHz
6 ns
3,744 mW
MC-458CB646LFA-A10
CL = 3
100 MHz
6 ns
3,888 mW
CL = 2
77 MHz
7 ns
3,744 mW
• Fully Synchronous Dynamic RAM, with all signals referenced to a positive clock edge
• Pulsed interface
• Possible to assert random column address in every cycle
• Quad internal banks controlled by BA0 and BA1 (Bank Select)
• Programmable burst-length: 1, 2, 4, 8 and full page
• Programmable wrap sequence (sequential / interleave)
• Programmable /CAS latency (2, 3)
• Automatic precharge and controlled precharge
• CBR (Auto) refresh and self refresh
• All DQs have 10 Ω ±10 % of series resistor
• Single 3.3 V ± 0.3 V power supply
• LVTTL compatible
• 4,096 refresh cycles/64 ms
• Burst termination by Burst Stop command and Precharge command
• 168-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. M13049EJ5V0DS00 (5th edition)
Date Published February 1999 NS CP(K)
The mark • shows major revised points.
Printed in Japan
©
1997