CY7C421-20PC Cypress Semiconductor Corp, CY7C421-20PC Datasheet - Page 10
CY7C421-20PC
Manufacturer Part Number
CY7C421-20PC
Description
Manufacturer
Cypress Semiconductor Corp
Datasheet
1.CY7C421-20PC.pdf
(16 pages)
Specifications of CY7C421-20PC
Configuration
Dual
Density
4.5Kb
Access Time (max)
20ns
Word Size
9b
Organization
512x9
Sync/async
Asynchronous
Expandable
Yes
Bus Direction
Uni-Directional
Package Type
PDIP
Clock Freq (max)
Not RequiredMHz
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (max)
5.5V
Supply Current
55mA
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
28
Lead Free Status / RoHS Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CY7C421-20PC
Manufacturer:
CYP
Quantity:
58
Part Number:
CY7C421-20PC
Manufacturer:
CYP
Quantity:
20 000
Company:
Part Number:
CY7C421-20PC**
Manufacturer:
CY
Quantity:
55
Switching Waveforms
Document #: 38-06001 Rev. *D
Note
14. Expansion Out of device 1 (XO
XO
XO
1
1
(XI
(XI
Q
D
0
0
2
2
–Q
–D
)
)
[14]
[14]
W
R
8
8
READ FROM LAST PHYSICAL
LOCATION OF DEVICE 1
1
t
) is connected to Expansion In of device 2 (XI
LZR
(continued)
t
XOL
WRITE TO LAST PHYSICAL
t
A
LOCATION OF DEVICE 1
t
XOL
Figure 12. Expansion Timing Diagrams
t
DATA
VALID
DVR
DATA VALID
t
SD
t
RR
t
t
XOH
HD
t
WR
2
)
t
READ FROM FIRST PHYSICAL
XOH
LOCATION OF DEVICE 2
WRITE TO FIRST PHYSICAL
LOCATION OF DEVICE 2
t
A
DATA VALID
t
SD
VALID
DATA
CY7C419/21/25/29/33
t
DVR
t
HD
t
HZR
Page 10 of 16
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