62A
CYM9260
CYM9261B
CYM9262A
CYM9263
64K x 72 SRAM Module
128K x 72 SRAM Module
256K x 72 SRAM Module
512K x 72 SRAM Module
surface mount packages on an epoxy laminate board with
pins. The modules are designed to be incorporated into large
memory arrays.
Features
• Operates at 66 MHz
• Uses64K x18, 128K x18, or256K x18highperformance
synchronous SRAMs
• 168-position Angled DIMM from Amp p/n 179508-2
• 3.3V inputs/data outputs
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’s.
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 CYM9260, CYM9261, CYM9262, and the CYM9263 are
high-performance synchronous memory modules organized
as 64K(9260), 128K(9261), 256K(9262), or 512K(9263) by 72
bits. These modules are constructed from either 128K x
18(9260,9261B,9262A) or 256K x 18 (9263) SRAMs in plastic
LogicBlockDiagram- CYM9260
V
cc3
V
cc3
R2
R4
A[15:0]
WE[7:0]
ADSP
DQ[0:15]
DQP[0:1]
R3
A
15:0
OE[0:1]
ADSP
OE
OE0
CS0
D[0:63]
DP[0:7]
CS[0:1]
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
Cypress Semiconductor Corporation
Document #: 38-05002 Rev. **
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
Revised March 27, 2002