Cypress STK17TA8 manual Features, Description, Logic Block Diagram

STK17TA8

128k X 8 AutoStore™ nvSRAM with Real Time Clock

Features

■nvSRAM Combined with Integrated Real Time Clock Functions (RTC, Watchdog Timer, Clock Alarm, Power Monitor)

■Capacitor or Battery Backup for RTC

■25, 45 ns Read Access and Read/Write Cycle Time

■Unlimited Read/Write Endurance

■Automatic nonvolatile STORE on Power Loss

■Nonvolatile STORE Under Hardware or Software Control

■Automatic RECALL to SRAM on Power Up

■Unlimited RECALL Cycles

■200K STORE Cycles

■20-Year nonvolatile Data Retention

■Single 3 V +20%, -10% Power Supply

■Commercial and Industrial Temperatures

■48-pin 300-mil SSOP Package (RoHS-Compliant)

Description

The Cypress STK17TA8 combines a 1 Mb nonvolatile static RAM (nvSRAM) with a full featured real time clock in a reliable, monolithic integrated circuit.

The 1 Mb nvSRAM is a fast static RAM with a nonvolatile Quantum Trap storage element included with each memory cell.

The SRAM provides the fast access and cycle times, ease of use and unlimited read and write endurance of a normal SRAM. Data transfers automatically to the nonvolatile storage cells when power loss is detected (the STORE operation). On power up, data is automatically restored to the SRAM (the RECALL operation). Both STORE and RECALL operations are also available under software control.

The real time clock function provides an accurate clock with leap year tracking and a programmable, high accuracy oscillator. The Alarm function is programmable for one-time alarms or periodic minutes, hours, or days alarms. There is also a programmable watchdog timer for processor control.

Logic Block Diagram

		Quantum Trap		VCC	VCAP
A5		1024 X 1024		POWER		VRTCbat
A6	DECODER		STORE	CONTROL		VRTCcap
A7
A8		STATIC RAM		STORE/
A9			RECALL
		ARRAY		RECALL
A12						HSB
A13	ROW	1024 X 1024		CONTROL
A14
A15					SOFTWARE
A16							A15 – A0
					DETECT
DQ0	BUFFERS	COLUMN I/O
DQ1							X1
DQ2		COLUMN DEC			RTC
DQ3							X2
DQ4							INT
	INPUT
DQ5		A0 A1 A2 A3 A4 A10 A11
DQ6					MUX		A16 – A0
DQ7
							G
							E
							W

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document #: 001-52039 Rev. **		Revised March 02, 2009

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