MB90540/540G/545/545G Series
(6) Bus Timing (Write)
(MB90F543/F549 : VCC = 4.5 V to 5.5 V, VSS = 0.0 V, TA = −40 °C to +85 °C)
(MB90543G(S)/547G(S)/548G(S)/F548GL(S): VCC = 3.5 V to 5.5 V, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)
(Other than MB90F543/F549/543G(S)/547G(S)/548G(S)/F548GL(S):
VCC = 5.0 V ± 10%, VSS = AVSS = 0.0 V, TA = −40 °C to +105 °C)
Value
Parameter
Symbol
Pin name
Condition
Units Remarks
Min
Max
A16 to A23
AD00 to AD15,
WR
Valid address→WR↓time
tAVWL
tCP − 15
ns
WR pulse width
tWLWH
tDVWH
WR
3 tCP/2 − 20
3 tCP/2 − 20
ns
ns
AD00 to AD15,
WR
Valid data output→WR↑time
AD00 to AD15,
WR
WR↑→Data hold time
tWHDX
tWHAX
20
ns
ns
A16 to A23,
WR
WR↑→Address valid time
tCP/2 − 10
WR↑→ALE↑time
WR↑→CLK↑time
tWHLH
tWLCH
WR, ALE
WR, CLK
tCP/2 − 15
tCP/2 − 20
ns
ns
• Bus Timing (Write)
tWLCH
2.4 V
CLK
tWHLH
2.4 V
ALE
tAVWL
tWLWH
2.4 V
WR (WRL, WRH)
0.8 V
tWHAX
2.4 V
0.8 V
2.4 V
0.8 V
A16 to A23
tDVWH
tWHDX
2.4 V
0.8 V
2.4 V
0.8 V
2.4 V
0.8 V
AD00 to AD15
Address
Write data
50
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