Cypress CY7C1412JV18 用户手册

36-Mbit QDR™-II SRAM 2-Word

Burst Architecture

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198 Champion Court

•

San Jose

,

CA 95134-1709

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408-943-2600

Document #: 001-12561 Rev. *D

 Revised March 10, 2007

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Separate independent read and write data ports

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Supports concurrent transactions

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267 MHz clock for high bandwidth

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2-word burst on all accesses

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Double Data Rate (DDR) interfaces on both read and write ports 
(data transferred at 534 MHz) at 267 MHz 

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Two input clocks (K and K) for precise DDR timing

❐

SRAM uses rising edges only

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Two input clocks for output data (C and C) to minimize clock 
skew and flight time mismatches

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Echo clocks (CQ and CQ) simplify data capture in high-speed 
systems

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Single multiplexed address input bus latches address inputs 
for both read and write ports

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Separate port selects for depth expansion

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Synchronous internally self-timed writes

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QDR™-II operates with 1.5 cycle read latency when Delay Lock 
Loop (DLL) is enabled 

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Operates like a QDR-I device with 1 cycle read latency in DLL 
off mode

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Available in x8, x9, x18, and x36 configurations 

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Full data coherency, providing most current data

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Core V

DD

 = 1.8V (±0.1V); IO V

DDQ

 = 1.4V to V

DD

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Available in 165-Ball FBGA package (15 x 17 x 1.4 mm)

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Offered in both Pb-free and non Pb-free packages

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Variable drive HSTL output buffers

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JTAG 1149.1 compatible test access port

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Delay Lock Loop (DLL) for accurate data placement

CY7C1410JV18 – 4M x 8
CY7C1425JV18 – 4M x 9
CY7C1412JV18 – 2M x 18
CY7C1414JV18 – 1M x 36

The CY7C1410JV18, CY7C1425JV18, CY7C1412JV18, and
CY7C1414JV18 are 1.8V Synchronous Pipelined SRAMs,
equipped with QDR-II architecture. QDR-II architecture consists
of two separate ports: the read port and the write port to access
the memory array. The read port has data outputs to support read
operations and the write port has data inputs to support write
operations. QDR-II architecture has separate data inputs and
data outputs to completely eliminate the need to “turn-around”
the data bus required with common IO devices. Access to each
port is accomplished through a common address bus. The read
address is latched on the rising edge of the K clock and the write
address is latched on the rising edge of the K clock. Accesses to
the QDR-II read and write ports are completely independent of
one another. To maximize data throughput, both read and write
ports are provided with DDR interfaces. Each address location
is associated with two 8-bit words (CY7C1410JV18), 9-bit words
(CY7C1425JV18), 18-bit words (CY7C1412JV18), or 36-bit
words (CY7C1414JV18) that burst sequentially into or out of the
device. Because data can be transferred into and out of the
device on every rising edge of both input clocks (K and K and C
and C), memory bandwidth is maximized while simplifying
system design by eliminating bus “turn-arounds”.

Depth expansion is accomplished with port selects, which
enables each port to operate independently.

All synchronous inputs pass through input registers controlled by
the K or K input clocks. All data outputs pass through output
registers controlled by the C or C (or K or K in a single clock
domain) input clocks. Writes are conducted with on-chip
synchronous self-timed write circuitry.

Maximum Operating Frequency 

267

250

MHz

Maximum Operating Current 

x8

1330

1200

mA

x9

1330

1200

x18

1370

1230

x36

1460

1290