ELECTRICAL CHARACTERISTICS
MC68332
A-24
USER’S MANUAL
Notes for Tables A–8 and A–8a:
1. All AC timing is shown with respect to 20% V
DD
and 70% V
DD
levels unless otherwise noted.
2. When the previous bus cycle is not an ECLK cycle, the address may be valid before ECLK goes low.
3. Address access time = t
Ecyc
– t
EAD
– t
EDSR
.
4. Chip select access time = t
Ecyc
– t
ECSD
– t
EDSR
.
Table A-8 16.78 MHz ECLK Bus Timing
(V
DD
= 5.0 Vdc
±
10%, V
SS
= 0 Vdc, T
A
= T
L
to T
H
)
Num
Characteristic
Symbol
Min
Max
Unit
E1
ECLK Low to Address Valid
2
t
EAD
—
60
ns
E2
ECLK Low to Address Hold
t
EAH
15
—
ns
E3
ECLK Low to CS Valid (CS delay)
t
ECSD
—
150
ns
E4
ECLK Low to CS Hold
t
ECSH
15
—
ns
E5
CS Negated Width
t
ECSN
30
—
ns
E6
Read Data Setup Time
t
EDSR
30
—
ns
E7
Read Data Hold Time
t
EDHR
5
—
ns
E8
ECLK Low to Data High Impedance
t
EDHZ
—
60
ns
E9
CS Negated to Data Hold (Read)
t
ECDH
0
—
ns
E10
CS Negated to Data High Impedance
t
ECDZ
—
1
t
cyc
E11
ECLK Low to Data Valid (Write)
t
EDDW
—
2
t
cyc
E12
ECLK Low to Data Hold (Write)
t
EDHW
15
—
ns
E13
Address Access Time (Read)
3
t
EACC
386
—
ns
E14
Chip Select Access Time (Read)
4
t
EACS
296
—
ns
E15
Address Setup Time
t
EAS
1/2
—
t
cyc
Table A-8a 20.97 MHz ECLK Bus Timing
(V
DD
= 5.0 Vdc
±
5%, V
SS
= 0 Vdc, T
A
= T
L
to T
H
)
Num
Characteristic
Symbol
Min
Max
Unit
E1
ECLK Low to Address Valid
2
t
EAD
—
48
ns
E2
ECLK Low to Address Hold
t
EAH
10
—
ns
E3
ECLK Low to CS Valid (CS delay)
t
ECSD
—
120
ns
E4
ECLK Low to CS Hold
t
ECSH
10
—
ns
E5
CS Negated Width
t
ECSN
25
—
ns
E6
Read Data Setup Time
t
EDSR
25
—
ns
E7
Read Data Hold Time
t
EDHR
5
—
ns
E8
ECLK Low to Data High Impedance
t
EDHZ
—
48
ns
E9
CS Negated to Data Hold (Read)
t
ECDH
0
—
ns
E10
CS Negated to Data High Impedance
t
ECDZ
—
1
t
cyc
E11
ECLK Low to Data Valid (Write)
t
EDDW
—
2
t
cyc
E12
ECLK Low to Data Hold (Write)
t
EDHW
10
—
ns
E13
Address Access Time (Read)
3
t
EACC
308
—
ns
E14
Chip Select Access Time (Read)
4
t
EACS
236
—
ns
E15
Address Setup Time
t
EAS
1/2
—
t
cyc
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Freescale Semiconductor, Inc.
For More Information On This Product,
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