72-Mbit QDR™-II+ SRAM 4-Word BurstArchitecture (2.5 Cycle Read Latency)
CY7C1561V18, CY7C1576V18
CY7C1563V18, CY7C1565V18
CypressSemiconductor Corporation • 198 Champion Court • San Jose,CA 95134-1709 • 408-943-2600
Document Number: 001-05384 Rev. *F Revised March 6, 2008
Features
■Separate independent read and write data ports
❐Supports concurrent transactions
■400 MHz clock for high bandwidth
■4-word burst for reducing address bus frequency
■Double Data Rate (DDR) interfaces on both read and write ports
(data transferred at 800 MHz) at 400 MHz
■Available in 2.5 clock cycle latency
■Two input clocks (K and K) for precise DDR timing
❐SRAM uses rising edges only
■Echo clocks (CQ and CQ) simplify data capture in high-speed
systems
■Data valid pin (QVLD) to indicate valid data on the output
■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
■Available in x8, x9, x18, and x36 configurations
■Full data coherency, providing most current data
■Core VDD = 1.8V ± 0.1V; IO VDDQ = 1.4V to VDD [1]
■HSTL inputs and variable drive HSTL output buffers
■Available in 165-Ball FBGA package (15 x 17 x 1.4 mm)
■Offered in both Pb-free and non Pb-free packages
■JTAG 1149.1 compatible test access port
■Delay Lock Loop (DLL) for accurate data placement
Configurations
With Read Cycle Latency of 2.5 cycles:
CY7C1561V18 – 8M x 8
CY7C1576V18 – 8M x 9
CY7C1563V18 – 4M x 18
CY7C1565V18 – 2M x 36
Functional Description
The CY7C1561V18, CY7C1576V18, CY7C1563V18, and
CY7C1565V18 are 1.8V Synchronous Pipelined SRAMs,
equipped with QDR-II+ architecture. Similar to QDR-II archi-
tecture, QDR-II+ SRAMs 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. Each port is accessed
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 four 8-bit
words (CY7C1561V18), 9-bit words (CY7C1576V18), 18-bit
words (CY7C1563V18), or 36-bit words (CY7C1565V18) that
burst sequentially into or out of the device. Because data is trans-
ferred into and out of the device on every rising edge of both input
clocks (K and K), memory bandwidth is maximized while simpli-
fying 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 K or K input clocks. Writes are
conducted with on-chip synchronous self-timed write circuitry.
Selection Guide
Description 400 MHz 375 MHz 333 MHz 300 MHz Unit
Maximum Operating Frequency 400 375 333 300 MHz
Maximum Operating Current x8 1400 1300 1200 1100 mA
x9 1400 1300 1200 1100
x18 1400 1300 1200 1100
x36 1400 1300 1200 1100
Note
1. The QDR consortium specification for VDDQ is 1.5V + 0.1V. The Cypress QDR devices exceed the QDR consortium specification and are capable of supporting
VDDQ= 1.4V to VDD.
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