CY7C1354DV25, CY7C1356DV25
9-Mbit (256K x 36/512K x 18)
Pipelined SRAM with NoBL™ Architecture
Features
Functional Description
The CY7C1354DV25 and CY7C1356DV25 are 2.5V, 256K x 36
and 512K x 18 Synchronous pipelined burst SRAMs with No Bus
Latency™ (NoBL™) logic, respectively. They are designed to
support unlimited true back to back read and write operations
with no wait states. The CY7C1354DV25 and CY7C1356DV25
are equipped with the advanced (NoBL) logic required to enable
consecutive read and write operations with data being trans-
ferred on every clock cycle. This feature dramatically improves
the throughput of data in systems that require frequent write and
read transitions. The CY7C1354DV25 and CY7C1356DV25 are
pin compatible with and functionally equivalent to ZBT devices.
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Pin compatible with and functionally equivalent to ZBT™
Supports 250 MHz bus operations with zero wait states
Available speed grades are 250, 200, and 166 MHz
Internally self timed output buffer control to eliminate the need
to use asynchronous OE
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Fully registered (inputs and outputs) for pipelined operation
Byte Write capability
Single 2.5V power supply (VDD
Fast clock-to-output times
)
All synchronous inputs pass through input registers controlled by
the rising edge of the clock. All data outputs pass through output
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.
❐
2.8 ns (for 250 MHz device)
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Clock Enable (CEN) pin to suspend operation
Synchronous self timed writes
Write operations are controlled by the Byte Write Selects
(BWa–BWd for CY7C1354DV25 and BWa–BWb for
CY7C1356DV25) and a Write Enable (WE) input. All writes are
conducted with on-chip synchronous self timed write circuitry.
Available in Pb-free 100-pin TQFP package, Pb-free and non
Pb-free 119-ball BGA package, and 165-ball FBGA package
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IEEE 1149.1 JTAG compatible boundary scan
Burst capability–linear or interleaved burst order
“ZZ” Sleep mode and Stop Clock options
Three synchronous Chip Enables (CE1, CE2, CE3) and an
asynchronous Output Enable (OE) provide 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. For best practices recommendations, please
refer to the Cypress application note System Design Guidelines
on www.cypress.com.
Selection Guide
Description
250 MHz
2.8
200 MHz
3.2
166 MHz
3.5
Unit
ns
Maximum Access Time
Maximum Operating Current
250
220
180
mA
mA
Maximum CMOS Standby Current
40
40
40
Cypress Semiconductor Corporation
Document #: 001-48974 Rev. *A
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised July 31, 2009
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