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SCHOTTKY BIPOLAR 8228
WAVEFORMS
DBIN
STATUS STROBE
INTA, lOR, MEMR
DURING
HLDA
HLDA
--------+----+-----'1
8080
DATA
BUS
-----...".I'~~+--,.,.I"--------------------
lOW
OR
MEMW
8080 BUS DURING
READ·
- - - - - - - - -
8080 BUS DURING WRITE
SYSTEM
BUS
DURING READ
SYSTEM BUS DURING WRITE - - - - - - - - -
<
~
we1=
SYSTEM
BUS
ENABLE.
j 1
.-
tE~r
SYSTEM
BUS
OUTPUTS - - - - - - - - - - - - - - - <
t--
> - - - - - - - - - - - - - -
VOLTAGE
MEASUREMENT
POINTS:
00-07
(when outputs) Logic
"0"
=
0.8V,
Logic
"1"
=
3.0V.
All
other
signals measured
at
1.5V.
A.C. Characteristics
TA
= O°c
to
70°C; Vee =
5V
±5%.
Limits
Symbol
Parameter
Min.
Max.
Units
Condition
tpw
Width
of
Status Strobe
22
ns
tss
Setup Time, Status Inputs D
o
-D7
8
ns
tSH
Hold Time, Status Inputs Do-D7
5
ns
toe
Delay from STSTB
to
any Control Signal
20
60
ns
CL = 100pF
tRR
Delay from DBIN
to
Control Outputs
30
ns
CL = 100pF
tRE
Delay
from
DBIN
to
Enable/Disable 8080
Bus
45
ns
CL = 25pF
tAD
Delay
from
System
Bus·
to
8080
Bus
during
Read
30
ns
CL = 25pF
tWA
Delay from
WR
to
Control Outputs
5
45
ns
CL = 100pF
tWE
Delay
to
Enable System
Bus
DBo-DB7 after STSTB
30
ns
CL = 100pF
two
Delay from 8080
Bus
D
o
-D7
to
System
Bus
ns
CL = 100pF
DBo-DB7 during Write
5
40
tE
Delay from System
Bus
Enable
to
System
Bus
DBo-DB7
30
ns
CL
= 100pF
tHO
HLDA
to
Read
Status Outputs
25
ns
tos
Setup Time, System
Bus
Inputs
to
HLDA
10
ns
tOH
Hold Time, System
Bus
Inputs
to
HLDA
20
\
ns
CL = 100pF
5-10