CY7C421-20PC Cypress Semiconductor Corp, CY7C421-20PC Datasheet - Page 2
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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
Logic Block Diagram
Pin Configurations
Document #: 38-06001 Rev. *D
Figure 1. 32-Pin PLCC/LCC (Top View)
NC
D
D
FF
Q
Q
Q
D
XI
2
0
0
1
2
1
5
6
7
8
9
10
11
12
13
14 15 1617 181920
4 3 2 1 323130
7C421/5/9
7C419
7C433
29
28
27
26
25
24
23
22
21
FL/RT
XO/HF
D
D
NC
MR
EF
Q
Q
6
7
7
6
W
XI
R
CONTROL
CONTROL
WRITE
READ
Figure 2. 28-Pin DIP (Top View)
EXPANSION
LOGIC
LOGIC
FLAG
POINTER
WRITE
GND
BUFFERS
Q
Q
Q
Q
Q
D
D
D
D
D
FF
W
XI
8
3
2
1
0
0
1
2
3
8
THREE-
STATE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
7C420/1
7C424/5
7C428/9
7C432/3
7C419
DATA OUTPUTS
DATA INPUTS
RAM ARRAY
(Q 0 –Q 8 )
1024x 9
2048x 9
4096x 9
(D 0 –D 8 )
256 x 9
512 x 9
28
27
26
25
24
23
22
21
20
19
18
17
16
15
EF
FF
XO/HF
V cc
D
D
D
D
FL/RT
MR
EF
XO/HF
Q
Q
Q
Q
R
4
5
6
7
7
6
5
4
POINTER
READ
RESET
LOGIC
NC
NC
D
D
FF
Q
Q
XI
1
0
0
1
Figure 3. 32-PIn TQFP (Top View)
MR
FL/RT
CY7C419/21/25/29/33
1
2
3
4
5
6
7
8
32 3130 29 28 27
9 10 11 12 13 14 15
7C421/5/9
7C419
7C433
26
25
16
24
23
22
21
20
19
18
17
Page 2 of 16
D
FL/RT
NC
NC
MR
EF
XO/HF
Q
7
7
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