CY7C1517V18
CY7C1528V18
CY7C1519V18
CY7C1521V18
72-Mbit DDR-II SRAM 4-Word Burst
Architecture
Features
• 72-Mbit density (8M x 8, 8M x 9, 4M x 18, 2M x 36)
• 300-MHz clock for high bandwidth
• 4-Word burst for reducing address bus frequency
• Double Data Rate (DDR) interfaces
(data transferred at 600 MHz) @ 300 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
• Synchronous internally self-timed writes
• 1.8V core power supply with HSTL inputs and outputs
• Variable drive HSTL output buffers
• Expanded HSTL output voltage (1.4V–V
DD
)
• Available in 165-ball FBGA package (15 x 17 x 1.4 mm)
• Offered in lead-free and non lead-free packages
• JTAG 1149.1 compatible test access port
• Delay Lock Loop (DLL) for accurate data placement
Functional Description
The CY7C1517V18, CY7C1528V18, CY7C1519V18 and
CY7C1521V18 are 1.8V Synchronous Pipelined SRAM
equipped with DDR-II (Double Data Rate) architecture. The
DDR-II consists of an SRAM core with advanced synchronous
peripheral circuitry and a two-bit burst counter. Addresses for
Read and Write are latched on alternate rising edges of the
input (K) clock. Write data is registered on the rising edges of
both K and K. Read data is driven on the rising edges of C and
C if provided, or on the rising edge of K and K if C/C are not
provided. Each address location is associated with four 8-bit
words in the case of CY7C1517V18 and four 9-bit words in the
case of CY7C1528V18 that burst sequentially into or out of the
device. The burst counter always starts with “00” internally in
the case of CY7C1517V18 and CY7C1528V18. On
CY7C1519V18 and CY7C1521V18, the burst counter takes in
the last two significant bits of the external address and bursts
four 18-bit words in the case of CY7C1519V18, and four 36-bit
words in the case of CY7C1521V18, sequentially into or out of
the device.
Asynchronous inputs include output impedance matching
input (ZQ). Synchronous data outputs (Q, sharing the same
physical pins as the data inputs, D) are tightly matched to the
two output echo clocks CQ/CQ, eliminating the need for
separately capturing data from each individual DDR-II SRAM
in the system design.Output data clocks (C/C) enable
maximum system clocking and data synchronization flexibility.
All Synchronous Input 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.
Configurations
CY7C1517V18 – 8M x 8
CY7C1528V18 – 8M x 9
CY7C1519V18 – 4M x 18
CY7C1521V18 – 2M x 36
Selection Guide
300 MHz
Maximum Operating Frequency
Maximum Operating Current
300
950
278 MHz
278
900
250 MHz
250
850
200 MHz
200
750
167 MHz
167
700
Unit
MHz
mA
Cypress Semiconductor Corporation
Document #: 38-05565 Rev. *E
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised September 25, 2006
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