MB89610R Series
(6) Bus Read Timing
Parameter
Symbol
(VCC = +5.0 V±10%, FC = 10 MHz, VSS = 0.0 V, TA = –40°C to +85°C)
Value
Pin
Condition
Unit Remarks
Min.
Max.
Valid address → RD ↓
time
tAVRL
RD, A15 to 08
AD7 to 0
1/4 tinst* – 64 ns
—
µs
RD pulse width
tRLRH
RD
1/2 tinst* – 20 ns
—
µs
Valid address → read
data time
tAVDV
AD7 to 0,
A15 to 08
—
1/2 tinst*
µs No wait
RD ↓ → read data time tRLDV
RD, AD7 to 0
—
1/2 tinst* – 80 ns µs No wait
RD ↑ → data hold time tRHDX
AD7 to 0, RD
0
—
ns
RD ↑ → ALE ↑ time tRHLH
RD, ALE
—
1/4 tinst* – 40 ns
—
µs
RD ↑ → address
invalid time
tRHAX
RD, A15 to 08
1/4 tinst* – 40 ns
—
µs
RD ↓ → CLK ↑ time
CLK ↓ → RD ↑ time
tRLCH
tCLRH
RD, CLK
1/4 tinst* – 40 ns
—
µs
0
—
ns
RD ↓ → BUFC ↓ time tRLBL
RD, BUFC
–5
—
µs
BUFC ↑ → valid
address time
tBHAV
A15 to 08,
AD7 to 0, BUFC
5
—
µs
* : For information on tinst, see “(4), Instruction Cycle.”
CLK
ALE
AD
A
RD
BUFC
2.4 V
0.8 V
tRHLH
0.8 V
2.4 V
0.8 V
2.4 V
0.8 V
tAVRL
tAVDV
0.7 VCC
0.3 VCC
tRLCH
tRLDV
tRLRH
0.8 V
tRLBL
0.7 VCC
0.3 VCC
tRHDX
2.4 V
tCLRH
0.8 V
tRHAX
2.4 V
0.8 V
2.4 V
0.8 V
2.4 V
0.8 V
tRHAV
2.4 V
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