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Part Name
Description
CYM74S551-60 View Datasheet(PDF) - Cypress Semiconductor
Part Name
Description
Manufacturer
CYM74S551-60
OPTi Viper Chip Set Level II Cache Module Family
Cypress Semiconductor
CYM74S551-60 Datasheet PDF : 8 Pages
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PRELIMINARY
CYM74B550
CYM74P550A
CYM74S550, CYM74S551
Logic Block Diagram - CYM74S550, CYM74S551
Note: A
18
is not used by CYM74S550
TAGWE
DIRTYWE
DIRTYI
16Kx1
WE
DQ
A
13:0
8Kx8 (CYM74S550)
32Kx8 (CYM74S551)
WE
D
A
13:0
PD
3
CYM74S550 NC
CYM74S551 NC
PD
2
PD
1
NC NC
GND NC
PD
0
GND
GND
TAG
7
–TAG
0
A
18
–A
3
ADSP
ADSC
ADV
SYNCS
0
ECDOE
CLK
WE
7
–WE
0
A
18
–A
5
A
18
–A
5
32Kx18(CYM74S550)
64Kx18(CYM74S551)
DIRTYO
A
15:0
ADSP
ADSC
D
D
63
–D
0
ADV
CE
DP Pullup to V
CC3
OE
CLK
MSB
WE
1:0
WE
1:0
WE
1:0
WE
1:0
LSB
WE
7:6
WE
5:4
WE
3:2
WE
1:0
74b550-3
Selection Guide
Part Number
Cache Size
System Clock
Data SRAM t
AA
Tag SRAM t
AA
Part Number
Cache Size
System Clock
Data SRAM t
CO
Tag SRAM t
AA
Part Number
Cache Size
System Clock
Data SRAM t
CO
Tag SRAM t
AA
74S550-50
50 MHz
12 ns
20 ns
74B550-50
50 MHz
25 ns
20 ns
Asynchronous Cache Modules
74B550-60
256 KB
60 MHz
15 ns
15 ns
74B550-66
66 MHz
15 ns
12 ns
74P550A-50
50 MHz
12 ns
20 ns
Synchronous Pipelined Cache Modules
74P550A-60
256 KB
60 MHz
9 ns
15 ns
74P550A-66
66 MHz
9 ns
12 ns
74S550-60
256 KB
60 MHz
9 ns
15 ns
Synchronous Burst Cache Modules
74S550-66
74S551-50
66 MHz
9 ns
12 ns
50 MHz
12 ns
20 ns
74S551-60
512 KB
60 MHz
9 ns
15 ns
74S551-66
66 MHz
9 ns
12 ns
3
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