Cypress Semiconductor STK14C88-3 Manual do Utilizador descarregar pdf (Página 3)

STK14C88-3

Document Number: 001-50592 Rev. *A Page 3 of 17

Pin Configurations

Figure 1. Pin Diagram - 32-Pin SOIC/32-Pin PDIP

Table 1. Pin Definitions - 32-Pin SOIC/32-Pin PDIP

Pin Name Alt I/O Type Description

–A

Input Address Inputs. Used to select one of the 32,768 bytes of the nvSRAM.

-DQ

Input or

Output

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

WE W

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.

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.

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