MB90540/540G/545/545G Series
(5) Bus Timing (Read)
(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
ALE pulse width
Symbol Pin name Condition
Units Remarks
Min
Max
tLHLL
ALE
tCP/2 − 20
ns
ALE,
A16 to A23,
AD00 to
AD15
Valid address→ALE↓time
tAVLL
tCP/2 − 20
ns
ALE, AD00
to AD15
ALE↓→Address valid time
Valid address→RD↓time
tLLAX
tCP/2 − 15
tCP − 15
ns
ns
A16 toA23,
AD00 to
tAVRL
AD15, RD
A16 to A23,
AD00 to
AD15
Valid address→Valid data
input
tAVDV
5 tCP/2 − 60 ns
RD pulse width
tRLRH
tRLDV
RD
3 tCP/2 − 20
ns
RD, AD00 to
AD15
RD↓→Valid data input
3 tCP/2 − 60 ns
RD, AD00 to
AD15
RD↑→Data hold time
RD↓→ALE↑time
tRHDX
tRHLH
tRHAX
0
ns
ns
ns
RD, ALE
tCP/2 − 15
tCP/2 − 10
RD, A16 to
A23
RD↑→Address valid time
A16 to A23,
AD00 to
Valid address→CLK↑time
tAVCH
tCP/2 − 20
ns
AD15, CLK
RD↓→CLK↑time
ALE↓→RD↓time
tRLCH
tLLRL
RD, CLK
ALE, RD
tCP/2 − 20
tCP/2 − 15
ns
ns
48
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