SRAM Chip Sync Dual 3.3V 4M-Bit 256K x 18 4.4ns 144-Pin F-BGA

The FLEx18 family includes 512 Kbit, 1 Mbit, 2 Mbit, 4 Mbit, and 9 Mbit pipelined, synchronous, true dual port static RAMs that are high speed, low power 3.3V CMOS. Two ports are provided, permitting independent, simultaneous access to any location in memory. The result of writing to the same location by more than one port at the same time is undefined. Registers on control, address, and data lines allow for minimal setup and hold time. During a Read operation, data is registered for decreased cycle time. Each port contains a burst counter on the input address register. After externally loading the counter with the initial address, the counter increments the address internally. The internal Write pulse width is independent of the duration of the R/W/ input signal. The internal Write pulse is self-timed to allow the shortest possible cycle times. A HIGH on 0 or LOW on 1 for one clock cycle powers down the internal circuitry to reduce the static power consumption. One cycle with chip enables asserted is required to reactivate the outputs. Additional features include: readback of burst-counter internal address value on address lines, counter-mask registers to control the counter wrap around, counter interrupt flags, readback of mask register value on address lines, retransmit functionality, interrupt flags for message passing, JTAG for boundary scan, and asynchronous Master Reset.

• True Dual-Ported Memory Cells that Allow Simultaneous Access of the Same Memory Location
• Synchronous Pipelined Operation
• Family of 512 Kbit, 1 Mbit, 2 Mbit, 4 Mbit, and 9 Mbit Devices
• Pipelined Output Mode Allows Fast Operation
• 0.18 micron CMOS for Optimum Speed and Power
• High Speed Clock to Data Access
• 3.3V Low Power
  • Active as Low as 225 mA (typ)
  • Standby as Low as 55 mA (typ)
• Mailbox Function for Message Passing
• Global Master Reset
• Separate Byte Enables on Both Ports
• Commercial and Industrial Temperature Ranges
• IEEE 1149.1 Compatible JTAG Boundary Scan
• 144-Ball FBGA (13 mm × 13 mm) (1.0 mm pitch)
• 120 TQFP (14 mm x 14 mm x 1.4 mm)
• Pb-Free Packages Available
• Counter Wrap Around Control
  • Internal Mask Register Controls Counter Wrap Around
  • Counter-Interrupt Flags to Indicate Wrap Around
  • Memory Block Retransmit Operation
• Counter Readback on Address Lines
• Mask Register Readback on Address Lines
• Dual Chip Enables on Both Ports for Easy Depth Expansion