HM5257165B datasheet(59/62 Pages) ELPIDA

Part #	HM5257165B

Description	512M LVTTL interface SDRAM 133 MHz/100 MHz 8-Mword 횞 16-bit 횞 4-bank/16-Mword 횞 8-bit 횞 4-bank /32-Mword 횞 4-bit 횞 4-bank PC/133, PC/100 SDRAM

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Manufacturer	ELPIDA [Elpida Memory]

Direct Link	http://www.elpida.com/en

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59 / 62 page

HM5257165B/HM5257805B/HM5257405B-75/A6

Data Sheet E0081H10

59

Clock Suspend Mode

012

3

4

5

6

7

8

9

1011

1213

141516

171819

20

R:a

C:a

R:b

a

a+1 a+2

a+3

b

b+1 b+2

R:a

C:a R:b

C:b

a

a+1 a+2

b

b+1 b+2 b+3

C:b

Bank0

Active

Active clock

suspend start

Active clock

supend end

Bank0

Read

Bank3

Active

Read suspend

start

Read suspend

end

Bank0

Precharge

Bank3

Read

Earliest Bank3

Precharge

Bank0

Write

Bank0

Active

Active clock

suspend start

Active clock

suspend end

Bank3

Active

Write suspend

start

Write suspend

end

Bank3

Write

Bank0

Precharge

Earliest Bank3

Precharge

b+3

CKE

RAS

CS

CAS

WE

Address

DQM,

DQMU/DQML

CLK

BS

CKE

RAS

CS

CAS

WE

Address

DQM,

DQMU/DQML

BS

a+3

High-Z

;

tCES

tCEH

tCES

Read cycle

RAS-CAS delay = 2

CAS latency = 2

Burst length = 4

= V

or V

IH

IL

Write cycle

RAS-CAS delay = 2

CAS latency = 2

Burst length = 4

= V

or V

IH

IL

DQ (output)

DQ (input)

DQ (output)

DQ (input)

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HM5257165B Datasheet(PDF) 59 Page - Elpida Memory

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