72-Mbit QDR™-II SRAM 2-Word
Burst Architecture
CY7C1510JV18, CY7C1525JV18
CY7C1512JV18, CY7C1514JV18
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Document #: 001-14435 Rev. *C
Revised March 10, 2008
Features
■
Separate independent read and write data ports
❐
Supports concurrent transactions
■
267 MHz clock for high bandwidth
■
2-word burst on all accesses
■
Double Data Rate (DDR) interfaces on both read and write ports
(data transferred at 534 MHz) at 267 MHz
■
Two input clocks (K and K) for precise DDR timing
❐
SRAM uses rising edges only
■
Two input clocks for output data (C and C) to minimize clock
skew and flight time mismatches
■
Echo clocks (CQ and CQ) simplify data capture in high-speed
systems
■
Single multiplexed address input bus latches address inputs
for both read and write ports
■
Separate port selects for depth expansion
■
Synchronous internally self-timed writes
■
QDR-II operates with 1.5 cycle read latency when Delay Lock
Loop (DLL) is enabled
■
Operates like a QDR-I device with 1 cycle read latency in DLL
off mode
■
Available in x8, x9, x18, and x36 configurations
■
Full data coherency, providing most current data
■
Core V
DD
= 1.8V (±0.1V); IO V
DDQ
= 1.4V to V
DD
■
Available in 165-Ball FBGA package (15 x 17 x 1.4 mm)
■
Offered in both Pb-free and non Pb-free packages
■
Variable drive HSTL output buffers
■
JTAG 1149.1 compatible test access port
■
Delay Lock Loop (DLL) for accurate data placement
Configurations
CY7C1510JV18 – 8M x 8
CY7C1525JV18 – 8M x 9
CY7C1512JV18 – 4M x 18
CY7C1514JV18 – 2M x 36
Functional Description
The CY7C1510JV18, CY7C1525JV18, CY7C1512JV18, and
CY7C1514JV18 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 dedicated data outputs to
support read operations and the write port has dedicated 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 that exists with common
IO devices. Access to each port is through a common address
bus. Addresses for read and write addresses are latched on
alternate rising edges of the input (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 equipped with DDR interfaces. Each address location is
associated with two 8-bit words (CY7C1510JV18), 9-bit words
(CY7C1525JV18), 18-bit words (CY7C1512JV18), or 36-bit
words (CY7C1514JV18) 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.
Selection Guide
Description
267 MHz
250 MHz
Unit
Maximum Operating Frequency
267
250
MHz
Maximum Operating Current
x8
1375
1245
mA
x9
1385
1255
x18
1495
1365
x36
1710
1580
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