UPD30121 NEC [NEC], UPD30121 Datasheet - Page 44

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

44
MRAS (0:3)# pulse width
MRAS (0:3)# precharge time
UCAS#/LCAS# hold time
UCAS#/LCAS#
Note The CAS-before-RAS self-refresh parameter is valid when t
Notes 1. In 32-bit mode: Applied to MRAS (0:1)# pins
MRAS (0:3)#
(b) CAS-before-RAS self-refresh parameter
2. In 32-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#MRAS2#, UCAS#, and LCAS# pins
(output)
(output)
In 16-bit mode: Applied to UUCAS#/MRAS3#, ULCAS#/MRAS2#, and MRAS (0:1)# pins
In 16-bit mode: Applied to UCAS# and LCAS# pins
Note 1
Note 2
Parameter
Note
Symbol
Data Sheet U14691EJ1V0DS00
t
t
t
RASS
RPS
CHS
t
RASS
Condition
t
CHS
RASS
exceeds 100 s.
t
RPS
MIN.
100
110
50
MAX.
PD30121
Unit
ns
ns
s