Cypress CY7C1316BV18 - Manual

18-Mbit DDR-II SRAM 2-Word
Burst Architecture
CY7C1316BV18, CY7C1916BV18
CY7C1318BV18, CY7C1320BV18
Cypress Semiconductor Corporation • 198 Champion Court • San Jose , CA 95134-1709 • 408-943-2600
Document Number: 38-05621 Rev. *D Revised June 2, 2008
Features
■ 18-Mbit density (2M x 8, 2M x 9, 1M x 18, 512K x 36)
■ 300 MHz clock for high bandwidth
■ 2-word burst for reducing address bus frequency
■ Double Data Rate (DDR) interfaces
(data transferred at 600 MHz) at 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 (13 x 15 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
CY7C1316BV18 – 2M x 8
CY7C1916BV18 – 2M x 9
CY7C1318BV18 – 1M x 18
CY7C1320BV18 – 512K x 36
Functional Description
The CY7C1316BV18, CY7C1916BV18, CY7C1318BV18, and
CY7C1320BV18 are 1.8V Synchronous Pipelined SRAMs
equipped with DDR-II architecture. The DDR-II consists of an
SRAM core with advanced synchronous peripheral circuitry and
a one-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 two 8-bit words in the case of CY7C1316BV18
and two 9-bit words in the case of CY7C1916BV18 that burst
sequentially into or out of the device. The burst counter always
starts with a ‘0’ internally in the case of CY7C1316BV18 and
CY7C1916BV18. For CY7C1318BV18 and CY7C1320BV18,
the burst counter takes in the least significant bit of the external
address and bursts two 18-bit words (in the case of
CY7C1318BV18) of two 36-bit words (in the case of
CY7C1320BV18) sequentially into or out of the device.
Asynchronous inputs include an 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 to capture data
separately from each individual DDR SRAM in the system
design. Output data clocks (C/C) enable maximum system
clocking and data synchronization flexibility.
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 300 MHz 278 MHz 250 MHz 200 MHz 167 MHz Unit
Maximum Operating Frequency 300 278 250 200 167 MHz
Maximum Operating Current x8 815 775 705 575 490 mA
x9 820 780 710 580 490 mA
x18 855 805 730 600 510 mA
x36 930 855 775 635 540 mA
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