lc7874e Sanyo Semiconductor Corporation, lc7874e Datasheet - Page 4

• Manufacturer Part Number: lc7874e
• Description: Cd Graphics Decorder
• Manufacturer: Sanyo Semiconductor Corporation

Timing Characteristics (DRAM Access Timing) at Ta = 25°C, V
Random read/write cycle time
Page mode cycle time
RAS precharge time
RAS pulse width
RAS pulse width (page mode)
RAS hold time
CAS hold time
CAS pulse width
CAS precharge time
CAS precharge time
Row address setup time
Row address hold time
Column address setup time
Column address hold time
Read command setup time
Read command hold time
Read command hold time
Write command setup time
Write command hold time
Write command pulse width
Write data setup time
Write data hold time
CAS setup time
CAS hold time
RAS precharge
Read data setup time
Read data hold time
Refresh time
CAS active time
Parameter
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
RASP
t
t
t
t
WCS
WCH
RSH
CSH
CPN
RAH
CAH
RCS
RCH
RRH
t
CSR
CHR
RPC
RDS
RDH
t
t
t
RAS
CAS
t
ASR
ASC
t
t
REF
WP
RC
PC
RP
CP
DS
DH
(In page mode)
(Referenced to CAS )
(Referenced toRAS)
(CAS before RAS)
(CAS before RAS)
LC7874E
Conditions
DD
= 5 V
min
250
130
100
120
120
100
150
120
120
100
150
100
100
60
60
50
50
50
50
50
50
50
50
20
10
0
Ratings
typ
max
18000
3.5
No. 5521-4/22
Unit
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns