MSM85C154HVS Ver la hoja de datos (PDF) - Oki Electric Industry
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MSM85C154HVS Datasheet PDF : 15 Pages
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¡ Semiconductor
MSM85C154HVS
External data memory access AC characteristics
VCC = 4.75 to 5.25V, VSS = 0V, Ta = room temp
PORT 0, ALE, and PSEN connected with 100 pF load, other connected with 80 pF load
Parameter
Symble
Variable clock from*1
1 to 22 MHz
Unit
Min.
Max.
XTAL1, XTAL2 Oscillator Cycle
tCLCL
ALE Signal Width
tLHLL
Address Setup Time
(to ALE Falling Edge)
tAVLL
45.5
2tCLCL-40
1tCLCL-15
1000
ns
—
ns
—
ns
Address Hold Time
(from ALE Falling Edge)
RD Signal Width
WR Signal Width
RAM Data Read Time
(from RD Signal Falling Edge)
tLLAX
tRLRL
tWLWH
tRLDV
1tCLCL-35
6tCLCL-100
6tCLCL-100
—
—
ns
—
ns
—
ns
5tCLCL-105
ns
RAM Data Read Hold Time
(from RD Signal Rising Edge)
tRHDX
0
—
ns
Data Bus Floating Time
(from RD Signal Rising Edge)
tRHDZ
—
2tCLCL-70
ns
RAM Data Read Time
(from ALE Signal Falling Edge)
tLLDV
—
8tCLCL-100
ns
RAM Data Read Time
(from Address Output)
RD/WR Output Time from ALE
Falling Edge
RD/WR Output Time from Address
Output
WR Output Time from Data Output
Time from Data to WR Rising Edge
Data Hold Time
(from WR Rising Edge)
Time from to Address Float RD
Output
Time from RD/WR Rising Edge to
ALE Rising Edge
tAVDV
tLLWL
tAVWL
tQVWX
tQVWH
tWHQX
tRLAZ
tWHLH
—
3tCLCL-40
4tCLCL-70
2tCLCL-40
7tCLCL-105
2tCLCL-50
0
1tCLCL-30
9tCLCL-105
ns
3tCLCL+40
ns
—
ns
—
ns
—
ns
—
ns
—
ns
1tCLCL+40
ns
*1 The variable check is from 0 to 22 MHz when the external check is used.
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