CYM9265/CYM9266
CYM9267/CYM9268
PRELIMINARY
64K/128K/256K/512K x 72 SRAM Modules
face mount packages on an epoxy laminate board with pins.
The modules are designed to be incorporated into large mem-
ory arrays.
Features
• Operates at 133 MHz
• Uses 128K x 18, or 256K x 18 high performance syn-
chronous SRAMs
The module is configured as either one or two banks, where
each bank has separate chip select and output enable con-
trols. Separate clocks are provided for every pair of SRAMs.
• 168-position Angled DIMM from Amp p/n 179508-2
• 3.3V inputs/data outputs
Multiple ground pins and on-board decoupling capacitors en-
sure high performance with maximum noise immunity.
Functional Description
All components on the cache modules are surface mounted on
a multi-layer epoxy laminate (FR-4) substrate. The contact
pins are plated with 150 micro-inches of nickel covered by 30
micro-inches of gold flash.
The CYM9265, CYM9266, CYM9267, and the CYM9268 are
high-performance synchronous memory modules organized
as 64K(9265), 128K(9266), 256K(9267), or 512K(9268) by 72
bits. These modules are constructed from either 128K x
18(9265,9266,9267) or 256K x 18(9268) SRAMs in plastic sur-
LogicBlockDiagram- CYM9265
Vcc3
R2
Vcc3
R4
A[15:0]
WE[7:0]
DQ[0:15]
DQP[0:1]
R3
ADSP
A15:0
OE[0:1]
ADSP
OE
OE0
D[0:63]
DP[0:7]
CS[0:1]
CS0
CS
WEH
WEL
R1
ADSC
CLK
BANK 0
CLK[0:3]
R1, R2, R3, R4 are optional resistors
R1, R2, R4 are mounted for access using ADSC
R3, R2, R4 are mounted for access using ADSP
PD
PD
1
0
GND NC
BANK 0
64Kx72
9265-1
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
June 14, 2000