Cypress CY7C1576V18 用户手册

72-Mbit QDR™-II+ SRAM 4-Word Burst

Architecture (2.5 Cycle Read Latency)

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198 Champion Court

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San Jose

,

CA 95134-1709

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408-943-2600

Document Number: 001-05384 Rev. *F

 Revised March 6, 2008

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Separate independent read and write data ports

❐

Supports concurrent transactions

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400 MHz clock for high bandwidth

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4-word burst for reducing address bus frequency 

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Double Data Rate (DDR) interfaces on both read and write ports 
(data transferred at 800 MHz) at 400 MHz 

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Available in 2.5 clock cycle latency

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

❐

SRAM uses rising edges only

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

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Data valid pin (QVLD) to indicate valid data on the output

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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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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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HSTL inputs and variable drive HSTL output buffers

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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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JTAG 1149.1 compatible test access port

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Delay Lock Loop (DLL) for accurate data placement

With Read Cycle Latency of 2.5 cycles:
CY7C1561V18 – 8M x 8
CY7C1576V18 – 8M x 9
CY7C1563V18 – 4M x 18
CY7C1565V18 – 2M x 36

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.

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

1. The QDR consortium specification for V

DDQ

 is 1.5V + 0.1V. The Cypress QDR devices exceed the QDR consortium specification and are capable of supporting 

V

DDQ

= 1.4V to V

DD

.