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AC CHARACTERISTICS (T
A
READ/WRITE OPERATION:
Parameter
X1 Input Cycle Time
Address Setup Time to ALE
Address Hold Time after ALE ↓
Address → RD ↓ Delay Time
RD ↓ → Address Floating Time
Address → Data Input Time
ALE ↓ → Data Input Time
RD ↓ → Data Input Time
ALE ↓ → RD ↓ Delay Time
Data Hold Time after RD ↑
RD ↑ → ALE ↑ Delay Time
RD Width Low
ALE Width High
M1 Setup Time to ALE ↓
M1 Hold Time after ALE ↓
IO/M Setup Time to ALE ↓
IO/M Hold Time after ALE ↓
Address → WR ↓ Delay Time
ALE ↓ → Data Output Time
WR ↓ → Data Output Time
ALE ↓ → WR ↓ Delay Time
Data Setup Time to WR ↑
Data Hold Time after WR ↑
WR ↑ → ALE ↑ Delay Time
WR Width Low
= –40 to +85 ˚C, V
= AV
DD
DD
Symbol
Test Condition
t
CYC
t
f
= 15 MHz, C
AL
xx
t
LA
t
AR
t
C
= 150 pF
AFR
L
t
f
= 15 MHz, CL = 150 pF
AD
xx
t
LDR
t
RD
t
LR
t
C
= 150 pF
RDH
L
t
f
= 15 MHz, C
RL
xx
t
Data Read
RR
f
= 15 MHz, C
xx
OP code Fetch
f
= 15 MHz, C
xx
t
f
= 15 MHz, C
LL
xx
t
f
= 15 MHz
ML
xx
t
LM
t
IL
*
t
LI
t
f
= 15 MHz, C
AW
xx
t
LDW
t
C
= 150 pF
WD
L
t
f
= 15 MHz, C
LW
xx
t
DW
t
WDH
t
WL
t
WW
= +5.0 V ± 10 %, V
= AV
SS
SS
= 150 pF
L
= 150 pF
L
= 150 pF
L
= 150 pF
L
= 150 pF
L
= 150 pF
L
= 150 pF
L
µ PD78C14(A)
= 0 V)
MIN.
MAX.
UNIT
66
250
ns
30
ns
35
ns
100
ns
20
ns
250
ns
135
ns
120
ns
15
ns
0
ns
80
ns
215
ns
415
ns
90
ns
30
ns
35
ns
30
ns
35
ns
100
ns
180
ns
100
ns
15
ns
165
ns
60
ns
80
ns
215
ns
33
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