GENERAL DESCRIPTION
The Micron® Zero Bus Turnaround™ (ZBT®) SRAM family employs high-speed, low-power CMOS designs using an advanced CMOS process.
Micron’s 8Mb ZBT SRAMs integrate a 512K x 18, 256K x 32, or 256K x 36 SRAM core with advanced synchronous peripheral circuitry and a 2-bit burst counter. These SRAMs are optimized for 100 percent bus utilization, eliminating any turnaround cycles for READ to WRITE, or WRITE to READ, transitions. All synchronous inputs pass through registers controlled by a positive-edge-triggered single clock input (CLK).

FEATURES
• High frequency and 100 percent bus utilization
• Fast cycle times: 6ns, 7.5ns and 10ns
• Single +3.3V ±5% power supply (VDD)
• Separate +3.3V or +2.5V isolated output buffer supply (VDDQ)
• Advanced control logic for minimum control signal interface
• Individual BYTE WRITE controls may be tied LOW
• Single R/W# (read/write) control pin
• CKE# pin to enable clock and suspend operations
• Three chip enables for simple depth expansion
• Clock-controlled and registered addresses, data I/Os and control signals
• Internally self-timed, fully coherent WRITE
• Internally self-timed, registered outputs to eliminate the need to control OE#
• SNOOZE MODE for reduced-power standby
• Common data inputs and data outputs
• Linear or Interleaved Burst Modes
• Burst feature (optional)
• Pin/function compatibility with 2Mb, 4Mb, and 18Mb ZBT SRAM
• Automatic power-down
• 100-pin TQFP package
• 165-pin FBGA package
• 119-pin BGA package