CY14B256K データシートの表示（PDF） - Cypress Semiconductor

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CY14B256K

256 Kbit (32K x 8) nvSRAM with Real Time Clock

Cypress Semiconductor 

CY14B256K

256 Kbit (32K x 8) nvSRAM with Real Time Clock

Features

■ 25 ns, 35 ns, and 45 ns access times

■ Pin compatible with STK17T88

■ Data integrity of Cypress nvSRAM combined with full featured

Real Time Clock

❐ Low power, 350 nA RTC current

❐ Capacitor or battery backup for RTC

■ Watchdog timer

■ Clock alarm with programmable interrupts

■ Hands off automatic STORE on power down with only a small

capacitor

■ STORE to QuantumTrap™ initiated by software, device pin, or

on power down

■ RECALL to SRAM initiated by software or on power up

■ Infinite READ, WRITE, and RECALL cycles

■ High reliability

❐ Endurance to 200K cycles

❐ Data retention: 20 years at 55°C

■ Single 3V operation with tolerance of +20%, -10%

■ Commercial and industrial temperature

■ 48-Pin SSOP (ROHS compliant)

Functional Description

The Cypress CY14B256K combines a 256 Kbit nonvolatile static

RAM with a full-featured real time clock in a monolithic integrated

circuit. The embedded nonvolatile elements incorporate

QuantumTrap technology producing the world’s most reliable

nonvolatile memory. The SRAM is read and written an infinite

number of times, while independent, nonvolatile data resides in

the nonvolatile elements.

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

seconds, minutes, hours, or days. There is also a programmable

watchdog timer for process control.

Logic Block Diagram

A5

A6

A7

A8

A9

A 11

A 12

A 13

A 14

DQ 0

DQ 1

DQ 2

DQ 3

DQ 4

DQ 5

DQ 6

DQ 7

QuantumTrap

512 X 512

STORE

STATIC RAM

ARRAY

512 X 512

RECALL

COLUMN IO

COLUMN DEC

A0 A1 A2 A3 A4 A10

VCC

VCAP

POWER

CONTROL

STORE/

RECALL

CONTROL

VRTCbat

VRTCcap

HSB

SOFTWARE

DETECT

- A13 A0

RTC

MUX

x1

x2

INT

- A14 A0

OE

CE

WE

Cypress Semiconductor Corporation • 198 Champion Court

Document Number: 001-06431 Rev. *H

• San Jose, CA 95134-1709 • 408-943-2600

Revised February 24, 2009

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