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4-Mbit (256K x 18) Flow-through SRAM
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CY7C1353G
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 38-05515 Rev. *E Revised July 09, 2007
Features
• Supports up to 133-MHz bus operations with zero wait
states
— Data is transferred on every clock
• Pin compatible and functionally equivalent to ZBT™ devices
• Internally self timed output buffer control to eliminate the
need to use OE
• Registered inputs for flow-through operation
• Byte Write capability
• 256K x 18 common IO architecture
• 2.5V/3.3V IO power supply (V
DDQ
)
• Fast clock-to-output times
— 6.5 ns (for 133-MHz device)
• Clock Enable (CEN
) pin to suspend operation
• Synchronous self timed writes
• Asynchronous Output Enable
• Available in Pb-free 100-Pin TQFP package
• Burst Capability — linear or interleaved burst order
• Low standby power
Functional Description
[1]
The CY7C1353G is a 3.3V, 256K x 18 Synchronous
Flow-through Burst SRAM designed specifically to support
unlimited true back-to-back Read/Write operations without the
insertion of wait states. The CY7C1353G is equipped with the
advanced No Bus Latency™ (NoBL™) logic required to
enable consecutive Read/Write operations with data being
transferred on every clock cycle. This feature dramatically
improves the throughput of data through the SRAM, especially
in systems that require frequent Write-Read transitions.
All synchronous inputs pass through input registers controlled
by the rising edge of the clock. The clock input is qualified by
the Clock Enable (CEN
) signal, which when deasserted
suspends operation and extends the previous clock cycle.
Maximum access delay from the clock rise is 6.5 ns (133-MHz
device).
Write operations are controlled by the two Byte Write Select
(BW
[A:B]
) and a Write Enable (WE) input. All writes are
conducted with on-chip synchronous self timed write circuitry.
Three synchronous Chip Enables (CE
1
, CE
2
, CE
3
) and an
asynchronous Output Enable (OE
) provide for easy bank
selection and output tri-state control. To avoid bus contention,
the output drivers are synchronously tri-stated during the data
portion of a write sequence.
Note:
1.For best-practices recommendations, please refer to the Cypress application note System Design Guidelines on www.cypress.com.
C
MODE
BW
A
BW
B
WE
CE
1
CE
2
CE
3
OE
READ LOGIC
DQs
DQP
A
DQP
B
MEMORY
ARRAY
E
INPUT
REGISTER
ADDRESS
REGISTER
WRITE REGISTRY
AND DATA COHERENCY
CONTROL LOGIC
BURST
LOGIC
A0'
A1'
D1
D0
Q1
Q0
A0
A1
ADV/LD
CE
ADV/LD
C
CLK
CEN
WRITE
DRIVERS
D
A
T
A
S
T
E
E
R
I
N
G
S
E
N
S
E
A
M
P
S
WRITE ADDRESS
REGISTER
A0, A1, A
O
U
T
P
U
T
B
U
F
F
E
R
S
E
ZZ
SLEEP
CONTROL
Logic Block Diagram
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