UPD30121 NEC [NEC], UPD30121 Datasheet - Page 41

• Manufacturer Part Number: UPD30121
• Description: VR4121TM 64-/32-BIT MICROPROCESSOR
• Manufacturer: NEC [NEC]

MRAS (0:3)# pulse width
MRAS (0:3)# hold time (from UCAS#/LCAS# precharge)
MRAS (0:3)# precharge time
UCAS#/LCAS# hold time (from MRAS (0:3)# )
UCAS#/LCAS# pulse width
UCAS#/LCAS# precharge time
Read/write cycle time
MRAS (0:3)# hold time (from UCAS#/LCAS#)
Row address setup time (to MRAS (0:3)# )
UCAS#/LCAS#
Column address delay time from MRAS (0:3)#
Column address setup time (to UCAS#/LCAS# )
Column address read time (to MRAS (0:3)# )
Row address hold time (from MRAS (0:3)# )
Column address hold time 1 (from UCAS#/LCAS# )
Column address hold time 2 (from UCAS#/LCAS# )
Column address hold time 3 (from UCAS#/LCAS# )
WR# setup time
WR# hold time (from UCAS#/LCAS# )
Data output setup time
Data output hold time
(6) EDO-type DRAM write parameter (1/2)
Caution These ratings are applied only when a device operates within the recommended operating
The target DRAM is the
42S65165G5-A50, or 42S65165G5-A60.
condition range and the operating ambient temperature is kept constant.
If the power supply voltage or operating ambient temperature changes during DRAM access, the
above ratings are not applied.
delay time from MRAS (0:3)#
Parameter
PD42S16165L-A60, 42S18165L-A60, 42S64165G5-A50, 42S64165G5-A60,
Data Sheet U14691EJ1V0DS00
Symbol
t
t
t
t
t
t
t
t
RHCP
t
t
t
t
t
t
t
t
t
RASP
HCAS
CAH1
CAH2
CAH3
t
WCS
WCH
t
CSH
HPC
RSH
ASR
RCD
RAD
ASC
RAH
t
t
RAL
RP
CP
D1
D2
Condition
MIN.
70
45
43
50
10
10
25
25
24
22
40
20
10
10
10
20
10
0
0
0
0
MAX.
PD30121
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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