CY7C1520AV18

Features:

• 72-Mbit density (8M x 8, 8M x 9, 4M x 18, 2M 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) @ 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
• DDR-II operates with 1.5 cycle read latency when DLL is enabled
• Operates like a DDR I device with 1 cycle read latency in DLL off mode
• 1.8V core power supply with HSTL inputs and outputs
• Variable drive HSTL output buffers
• Expanded HSTL output voltage (1.4VV_DD)
• Available in 165-ball FBGA package (15 x 17 x 1.4 mm)
• Offered in both lead-free and non lead-free packages
• JTAG 1149.1 compatible test access port
• Delay Lock Loop (DLL) for accurate data placement


Specifications

Storage Temperature ....................................................65°C to + 150°C
Ambient Temperature with Power Applied ....................10°C to + 85°C
Supply Voltage on V_DD Relative to GND......................... 0.5V to + 2.9V
Supply Voltage on V_DDQ Relative to GND ..................... 0.5V to + V_DD
DC Applied to Outputs in High-Z................................... 0.5V to V_DD+ 0.3V
DC Input Voltage^[15] ...................................................0.5V to V_DD + 0.3V
Current into Outputs (LOW)......................................... 20 mA
Static Discharge Voltage (MIL-STD-883, M 3015)......... >2001V
Latch-up Current.......................................................... >200 mA


Description

The CY7C1516AV18, CY7C1527AV18, CY7C1518AV18 and CY7C1520AV18 are 1.8V Synchronous Pipelined SRAM equipped with DDR-II architecture. The DDR-II consists of an SRAM core with advanced synchronous peripheral circuitry and a 1-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 CY7C1516AV18 and two 9-bit words in the case of CY7C1527AV18 that burst sequentially into or out of the device. The burst counter always starts with a "0" internally in the case of CY7C1516AV18 and CY7C1527AV18. On CY7C1518AV18 and CY7C1520AV18, the burst counter takes in the least significant bit of the external address and bursts two 18-bit words in the case of CY7C1518AV18 and two 36-bit words in the case of CY7C1520AV18 sequentially into or out of the device.

Asynchronous inputs of  CY7C1516AV18, CY7C1527AV18, CY7C1518AV18 and CY7C1520AV18 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 SRAM in the system design. Output data clocks (C/C) enable maximum system clocking and data synchronization flexibility.

All synchronous inputs of  CY7C1516AV18, CY7C1527AV18, CY7C1518AV18 and CY7C1520AV18 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.