~ National ~ Semiconductor - Al Kossow's Bitsavers

4.0 Electrical Specifications (Continued)
Data Memory Write Timing
Symbol 10# Parameter Formula Min Max Units
tW-ALE 1 ALE High (nRW+1)T+ -7 ns
tpD-AD-ALE 2 AD (Data Address) Valid to ALE Falling T+ -28 ns
tPD-ALE-AD 3 ALE Falling to AD (Data Address) Invalid 0_5T+ -2 ns
tPD-DATA-WR 4 AD (Data) Valid to WRITE Rising (MAX(nDW,nIW-1) + 1)T + -12 ns
tpD-ADDR-WR 5 AD (Data Address) Valid to WRITE Falling 1_5T+ -22 ns
tpD-WR-DATA 6 WRITE Falling to AD (Data) Valid 11 ns
tPD-WR-DATAz 7 WRITE Rising to AD (Data) Invalid 0_5T+ 4 ns
tW-WR 8 WRITE low (MAX(nDW,nIW -1) + 1)T + -11 ns
Note 1: All parameters are individually tested and guaranteed. Interpreting this data by numerically adding two or more parameters to create a new timing
specification may lead to invalid results.
elK-OUT
Data Memory Write Timing
TI Tx T2
ALE
p~
WRITE
0-
~
AD ////////////L2 ADDR DATA
A /LLL//U///d/4
-0-- -
-0-0- -01-
-0-
TL/F/9336-53
Instruction Memory Read Timing
Symbol 10# Parameter Formula Min Max Units
tSU-I-ICLK 1 I Valid before IClK Rising 22 ns
tH-I-ICLK 2 I Invalid before IClK Falling 23 ns
tPD-IA-ICLK 3 IA Valid before IClK Falling O.5T+ -7 ns
tACC-1 4 Instruction Memory Read Time (nIW+ 1,5)T + -24 ns
Note 1: All parameters are individually tested and guaranteed. Interpreting this data by numerically adding two or more parameters to create a new timing
specification may lead to invalid results.
Instruction Memory Read
leLK
---I
CD- - -10 - - CD'I-
I :2K X'/ ////////,~
IA
1+0-
K
0
TLlF/9336-54
2-70