AS4C256K16F0-25JC ALSC [Alliance Semiconductor Corporation], AS4C256K16F0-25JC Datasheet - Page 18

• Manufacturer Part Number: AS4C256K16F0-25JC
• Description: 5V 256K X 16 CMOS DRAM (Fast Page Mode)
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

Fast page mode read-modify-write waveform
CAS-before-RAS refresh waveform
RAS-only refresh waveform
4/11/01; V.0.9.1
Address
Address
UCAS,
UCAS,
UCAS,
LCAS
LCAS
LCAS
RAS
I/O
RAS
RAS
I/O
WE
OE
t
ASR
t
RAD
Row Ad
t
t
RCS
RCD
t
RPC
t
RAC
t
t
ARS
RAH
t
OEA
Col Ad
t
RP
t
t
CSH
OFF
t
RWD
t
t
t
t
t
t
CLZ
t
CSR
AWD
AA
CAC
CPN
tCAS
CWD
Row Address
Data Out
t
t
CAH
t
PCM
OEZ
Alliance Semiconductor
Data In
t
CRP
t
RC
t
DS
t
CHR
t
t
CWL
DH
Col Ad
t
t
RAS
RASP
t
CP
t
t
RAH
t
t
CWD
t
CLZ
RAS
CAC
®
t
Data Out
DS
t
CAH
Data In
t
OED
t
RC
Col Address
t
RPC
t
CAH
t
t
t
t
CLZ
OEA
CAP
CAC
t
t
t
AWD
t
Data Out
RAL
CWD
RP
(WE = OE = V
Data In
AS4C256K16FO
t
WP
t
CWL
t
(WE = V
RWL
t
CRP
t
P. 18 of 25
RP
IH
or V
IH
IL
)
)