GVT71256C36

The Cypress Synchronous Burst SRAM family 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 CY7C1366A/GVT71256C36 and CY7C1367A/GVT71512C18 SRAMs integrate 262,144 x 36 and 524,288 x 18 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-edge-triggered 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 (BWa, BWb, BWc, BWd, and BWE), and Global Write
(GW). However, the CE2 Chip Enable input is only available for the TA(GVTI)/A(CY) package version.

Asynchronous inputs include the Output Enable (OE) and Burst Mode Control (MODE). The data outputs (Q), enabled by OE, are also asynchronous.

Addresses and chip enables 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 are registered on-chip to initiate a self-timed WRITE cycle. WRITE cycles can be one to four bytes wide, as controlled by the write control inputs.Individual byte write allows an individual byte to be written. BWa controls DQa. BWb controls DQb. BWc controls DQc.BWd controls DQd. BWa, BWb, BWc, and BWd can be active only with BWE being LOW. GW being LOW causes all bytes to be written. The x18 version only has 18 data inputs/outputs (DQa and DQb) along with BWa and BWb (no BWc, BWd,DQc, and DQd).

For the B(GVTI)/BG(CY) and T(GVTI)/AJ(CY) package versions,four pins are used to implement JTAG test capabilities: Test Mode Select (TMS), Test Data-In (TDI), Test Clock (TCK), and Test Data-Out (TDO). The JTAG circuitry is used to serially shift data to and from the device. JTAG inputs use LVTTL/LVCMOS levels to shift data during this testing mode of operation. The TA package version does not offer the JTAG capability.

The CY7C1366A/GVT71256C36 and CY7C1367A/GVT71512C18 operate from a +3.3V power supply. All inputs and outputs are LVTTL compatible.