CYRS1542AV18 Datasheet, PDF (1/33 Pages) Cypress Semiconductor – 72-Mbit QDR® II+ SRAM Two-Word Burst

CYRS1542AV18
CYRS1544AV18
72-Mbit QDR^® II+ SRAM Two-Word Burst
Architecture with RadStop™ Technology
72-Mbit QDR® II+ SRAM Two-Word Burst Architecture with RadStop™ Technology
Radiation Performance
Radiation Data
■ Total Dose =300 Krad
■ Soft error rate (both Heavy Ion and proton)
Heavy ions  1 × 10^-10 upsets/bit-day with single error
correction - double error detection error detection and
correction (SEC-DED EDAC)
■ Neutrons = 2.0 × 10¹⁴ N/cm²
■ Dose rate = 2.0 × 10⁹ rad(Si)/sec
■ Dose rate survivability (rad(Si)/sec) = 1.5 × 10^11 rad(Si)/sec
■ Latch up immunity = 120 MeV.cm²/mg (125 °C)
Prototyping Options
■ Non qualified CYPT1542AV18 and CTPY1544AV18 devices
with same functional and timing characteristics in a 165-ball
Ceramic Column Grid Array (CCGA) package
Features
■ Separate independent read and write data ports
❐ Supports concurrent transactions
■ 250-MHz clock for high bandwidth
■ 2-word burst on all accesses
■ Double data rate (DDR) interfaces on both read and write ports
at 250 MHz (data transferred at 500 MHz)
■ 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
■ 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 2.0 cycle read latency when delay lock
loop (DLL) is enabled
■ Available in × 18 and × 36 configurations
■ Full data coherency, providing most current data
■ Core V_DD = 1.8 V (±0.1 V); I/O V_DDQ = 1.4 V to V_DD
■ Available in 165-ball CCGA (21 × 25 × 2.83 mm)
■ HSTL inputs and variable drive HSTL output buffers
■ JTAG 1149.1 compatible test access port
■ DLL for accurate data placement
Configurations
CYRS1542AV18 – 4 M × 18
CYRS1544AV18 – 2 M × 36
Functional Description
The CYRS1542AV18 and CYRS1544AV18 are synchronous
pipelined SRAMs, equipped with 1.8-V QDR II+ architecture with
RadStop™ technology. Cypress’s state-of-the-art RadStop
Technology is radiation hardened through proprietary design and
process hardening techniques.
The QDR II+ architecture has separate data inputs and data
outputs to completely eliminate the need to turnaround the data
bus that exists with common I/O 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 18-bit
words (CYRS1542AV18), or 36-bit words (CYRS1544AV18) 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), memory bandwidth is maximized while
simplifying system design by eliminating bus turnarounds.
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
Maximum operating frequency
Maximum operating current
(concurrent R/W)
250 MHz Unit
250 MHz
× 18 1650 mA
× 36 1650
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 001-60006 Rev. *I
• San Jose, CA 95134-1709 • 408-943-2600
Revised January 4, 2013