Sonic Alert msm83c154s, msm80154s, msm85c154hvs External Program Memory Access AC Characteristics

ELECTRICAL CHARACTERISTICS

6.4 External Program Memory Access AC Characteristics

VCC=2.2 to 6.0V, VSS=0V, Ta=–40°C to +85°C

PORT 0, ALE, and PSEN connected with 100pF load, other connected with 80pF load

		Variable clock from*1
Parameter	Symble		1 to 24 MHz		Unit
		Min.		Max.
XTAL1, XTAL 2 Oscillation Cycle	tCLCL	41.7		1000	ns
ALE Signal Width	tLHLL	2tCLCL-40		—	ns
Address Setup Time	tAVLL	1tCLCL-15		—	ns
(to ALE Falling Edge)
Address Hold Time	tLLAX	1tCLCL-35		—	ns
(from ALE Falling Edge)
Instruction Data Read Time	tLLPL	—		4tCLCL-100	ns
(from ALE Falling Edge)
From ALE Falling Edge to PSEN	tLLPL	1tCLCL-30		—	ns
Falling Edge
PSEN Signal Width	tPLPH	3tCLCL-35		—	ns
Instruction Data Read Time	tPLIV	—		3tCLCL-45	ns
(from PSEN Falling Edge)
Instruction Data Hold Time	tPXIX	0		—	ns
(from PSEN Rising Edge)
Bus Floating Time after Instruction	tPXIZ	—		1tCLCL-20	ns
Data Read (from PSEN Rising Edge)
Instruction Data Read Time	tAVIV	—		5tCLCL-105	ns
(from Address Output)
Bus Floating Time(PSEN Rising	tAZPL	0		—	ns
Edge from Address float)
Address Output Time from PSEN	tPXAV	1tCLCL-20		—	ns
Rising Edge

*1 The variable check is from 0 to 24 MHz when the external check is used.

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