Cypress Semiconductor Perform STK12C68 Manual de usuario descargar pdf (Pagina 3)

STK12C68

Document Number: 001-51027 Rev. *G Page 3 of 22

Pin Configurations

Pin Definitions

Pin Name Alt I/O Type Description

–A

Input Address Inputs. Used to select one of the 8,192 bytes of the nvSRAM.

-DQ

Input or Output Bidirectional Data I/O Lines. Used as input or output lines depending on operation.

Input Write Enable Input, Active LOW. When the chip is enabled and WE is LOW, data on the I/O

pins is written to the specific address location.

CE E

Input Chip Enable Input, Active LOW. When LOW, selects the chip. When HIGH, deselects the chip.

Input Output Enable, Active LOW. The active LOW OE input enables the data output buffers during

read cycles. Deasserting OE

HIGH causes the I/O pins to tristate.

Ground Ground for the Device. The device is connected to ground of the system.

Power Supply Power Supply Inputs to the Device.

HSB

Input or Output Hardware Store Busy (HSB). When LOW, this output indicates a Hardware Store is in progress.

When pulled low external to the chip, it initiates a nonvolatile STORE operation. A weak internal

pull up resistor keeps this pin high if not connected (connection optional).

CAP

Power Supply AutoStore

Capacitor. Supplies power to nvSRAM during power loss to store data from SRAM

to nonvolatile elements.

Figure 1. 28-Pin SOIC/DIP and LLC

1 2 3 4 5 6 7 8 ... 21 22

Sin comentarios

Cypress Semiconductor Perform STK12C68 Manual de usuario Pagina 3