SDA5273-2 SIEMENS [Siemens Semiconductor Group], SDA5273-2 Datasheet - Page 19

• Manufacturer Part Number: SDA5273-2
• Description: ICs for Consumer Electronics MEGATEXT and MEGATEXT PLUS ICs
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Characteristics (cont’d)
T
Parameter
DRAM-Interface (see diagram 5)
The external DRAM is operated in page mode.
The timing of the DRAM-interface signals are specified below.
Cycle time
Address hold time from RAS
Address hold time from CAS
Address set-up time from
RAS
Address set-up time from
CAS
L-time RAS
L-time CAS
H-time RAS
H-time CAS
Refresh period
Write Cycle
L-time WE
Data set-up time to CAS
WE set-up time to CAS
Data hold time from CAS
Data hold time from WE
Read Cycle
H-time WE (output enable)
Access time from CAS
Data hold time of DRAM
Semiconductor Group
A
= 0 to 70 C
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
WC
RAH
CAH
ASR
ASC
RASP
CASL
RP
CP
WEL
DS
RCS
DH
OHZ
OEL
CAC
OFF
min.
420
25
60
5
5
280
70
140
70
20
210
100
0
55
210
40
Limit Values
19
typ.
500
max.
550
10
60
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
ns
ns
ns
ns
Test Condition
SDA 5273-2 / 75-2
SDA 5273 / 75
1997-09-01