6528

• Fast access times: 5, 6, 7, and 8ns
• Fast clock speed: 83, 75, 66, and 50 MHz
• Provide high performance 3-1-1-1 access rate
• Fast OE# access times: 5, 6, and 7ns
• Optimal for depth expansion (one cycle chip deselect to eliminate bus contention)
• Single +3.3V -5% and +10%power supply
• Support +2.5V I/O
• 5V tolerant inputs except I/O's
• Clamp diodes to VSSQ at all outputs
• Common data inputs and data outputs
• BYTE WRITE ENABLE and GLOBAL WRITE control
• Three chip enables for depth expansion and address pipeline
• Address, control, input, and output pipeline registers
• Internally self-timed WRITE CYCLE
• Burst control pins (interleaved or linear burst sequence)
• Automatic power-down for portable applications
• High density, high speed packages
• Low capacitive bus loading
• High 30pF output drive capability at rated access time

Voltage on VCC Supply Relative to VSS...  .....-0.5V to +4.6V
VIN ..........................................................-0.5V to VCC+0.5V
Storage Temperature (plastic) .....................-55^oC to +150^o
Junction Temperature .................................................+150^o
Power Dissipation .........................................................1.0W
Short Circuit Output Current .........................................50mA
*Stresses greater than those listed uunder "Absolute Maximum Ratings" may cause permanent damage to the device.This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

The Galvantech Synchronous Burst SRAM family of 6528 employs high-speed, low power CMOS designs using advanced triple-layer polysilicon, double-layer metal technology. Each memory cell consists of four transistors and two high valued resistors.

The 6528 SRAM integrates 65,536x32 SRAM cells with advanced synchronous peripheral circuitry and a 2-bit counter for internal burst operation. All synchronous inputs are gated by registers controlled by a positive-edgetriggered clock input (CLK). The synchronous inputs include all addresses, all data inputs, address-pipelining chip enable (CE#), depth-expansion chip enables (CE2# and CE2), burst control inputs (ADSC#, ADSP#, and ADV#), write enables (BW1#, BW2#, BW3#, BW4#,and BWE#), and global write (GW#).

Asynchronous inputs of 6528 include the output enable  (OE#)and burst mode control (MODE). The data outputs (Q),enabled by OE#, are also asynchronous.

Addresses and chip enables of 6528 are registered with either address status processor (ADSP#) or address status controller (ADSC#) input pins. Subsequent burst addresses can be internally generated as controlled by the burst advance pin (ADV#).

Address, data inputs, and write controls of 6528 are registered onchip to initiate self-timed WRITE cycle. WRITE cycles can be one to four bytes wide as controlled by the write control inputs. Individual byte write allows individual byte to be written. BW1# controls DQ1-DQ8. BW2# controls DQ9- DQ16. BW3# controls DQ17-DQ24. BW4# controls DQ25- DQ32. BW1#, BW2# BW3#, and BW4# can be active only with BWE# being LOW. GW# being LOW causes all bytes to be written. This device also incorporates pipelined enable circuit for easy depth expansion without penalizing system performance.

The 6528 operates from a +3.3V power supply. All inputs and outputs are TTL-compatible. The device is ideally suited for 486, PentiumTM, 680x0, and PowerPCTM systems and for systems that are benefited from a wide synchronous data bus.