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Cypress AutoStore STK17TA8 User Manual

128k x 8 autostore™ nvsram with real time clock, Stk17ta8, Features

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STK17TA8

128k X 8 AutoStore™ nvSRAM

with Real Time Clock

Cypress Semiconductor Corporation

198 Champion Court

San Jose

,

CA 95134-1709

408-943-2600

Document #: 001-52039 Rev. **

Revised March 02, 2009

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







R

O

W

DE

CO

D

E

R

INPU

T B

U

FFE

R

S

COLUMN DEC

G

E

W

COLUMN I/O

POWER

CONTROL

HSB

STORE/

RECALL

CONTROL

SOFTWARE

DETECT

A

15

– A

0

A

5

A

6

A

7

A

8

A

9

A

12

A

13

A

14

A

15

A

16

Quantum Trap

1024 X 1024

STATIC RAM

ARRAY

1024 X 1024

STORE

RECALL

DQ

0

DQ

1

DQ

2

DQ

3

DQ

4

DQ

5

DQ

6

DQ

7

A

0

A

1

A

2

A

3

A

4

A

10

A

11

V

CC

V

CAP

RTC

MUX

A

16

– A

0

X

1

X

2

INT

V

RTCbat

V

RTCcap

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