mt90870ag2 Zarlink Semiconductor, mt90870ag2 Datasheet - Page 84
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mt90870ag2
Manufacturer Part Number
mt90870ag2
Description
Flexible 12 K Digital Switch F12kdx
Manufacturer
Zarlink Semiconductor
Datasheet
1.MT90870AG2.pdf
(86 pages)
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MT90870AG2
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Non-Multiplexed Microprocessor Port Timing
Note:
1. High impedance is measured by pulling to the appropriate rail with R
taken to charge C
Note: There must be a minimum of 30 ns between CPU accesses, to allow the MT90869 device to recognize the
accesses as separate (i.e., a minimum of 30 ns must separate the de-assertion of DTA (to high) and the assertion
of CS and/or DS (to initiate the next access).
10
12
11
6
7
8
9
A0-A14
D0-D15
READ
D0-D15
WRITE
Address hold after DS rising
Data setup from DTA Low on Read
Data hold on read
Data setup on write
Data hold on write
Acknowledgment Delay:
Acknowledgment Hold Time
Reading/Writing Registers
Reading/Writing Memory
DS
CS
R/W
DTA
L
.
Characteristics
Figure 30 - Motorola Non-Multiplexed Bus Timing
Zarlink Semiconductor Inc.
t
t
CSS
ADS
t
Sym.
t
RWS
t
t
t
t
t
t
WDS
DHW
DDR
DHR
ADH
AKD
AKH
MT90870
t
WDS
84
Min.
14
8
8
8
L
= 1K/1K potential divider, with timing corrected to cancel time
VALID ADDRESS
t
AKD
t
Typ.
DDR
VALID WRITE DATA
VALID READ DATA
Max.
30
85
70
12
Units
t
t
CSH
t
DHW
ns
ns
ns
ns
ns
ns
ns
ns
DHR
t
t
RWH
ADH
t
AKH
C
C
Test Conditions
L
L
=60pF, R
=60pF, R
C
C
C
Data Sheet
Note 1
Note 1
L
L
L
=60pF
=60pF
=60pF
V
V
V
V
V
V
V
TT
TT
TT
TT
TT
TT
TT
L
L
=1K,
=1K
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