Datasheet > 存储 > SRAM> CY14B256I

CY14B256I

更新时间： 2024-11-19 09:41:07

品牌	Logo	应用领域
赛普拉斯 - CYPRESS		静态存储器时钟
页数	文件大小	规格书
41页	2316K
描述
256-Kbit (32 K x 8) Serial (I2C) nvSRAM with Real Time Clock Full-featured RTC

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CY14B256I 数据手册

CY14C256I

CY14B256I, CY14E256I

256-Kbit (32 K × 8) Serial (I²C) nvSRAM

with Real Time Clock

256-Kbit (32

K × 8) Serial (I²C) nvSRAM with Real Time Clock

■ I²C access to special functions

❐ Nonvolatile STORE/RECALL

❐ 8-byte serial number

❐ Manufacturer ID and Product ID

❐ Sleep mode

Features

■ 256-Kbit nonvolatile static random access memory (nvSRAM)

❐ Internally organized as 32 K × 8

❐ STORE to QuantumTrap nonvolatile elements initiated

automatically on power-down (AutoStore) or by using I²C

command (Software STORE) orHSB pin (Hardware STORE)

■ Low power consumption

❐ Average active current of 1 mA at 3.4 MHz operation

❐ Average standby mode current of 250 µA

❐ Sleep mode current of 8 µA

❐ RECALL to SRAM initiated on power-up (Power-Up

RECALL) or by I²C command (Software RECALL)

❐ Automatic STORE on power-down with a small capacitor

■ High reliability

■ Industry standard configurations

❐ Operating voltages:

❐ Infinite read, write, and RECALL cycles

❐ 1 million STORE cycles to QuantumTrap

❐ Data retention: 20 years at 85 °C

■ Real Time Clock (RTC)

❐ Full-featured RTC

❐ Watchdog timer

❐ Clock alarm with programmable interrupts

❐ Backup power fail indication

❐ Square wave output with programmable frequency (1 Hz,

512 Hz, 4096 Hz, 32.768 kHz)

❐ Capacitor or battery backup for RTC

❐ Backup current of 0.45 µA (typical)

■ High-speed I²C interface

❐ Industry standard 100 kHz and 400 kHz speed

❐ Fast mode Plus 1 MHz speed

❐ High speed: 3.4 MHz

• CY14C256I : V_CC= 2.4 V to 2.6 V

• CY14B256I : V_CC= 2.7 V to 3.6 V

• CY14E256I : V_CC= 4.5 V to 5.5 V

❐ Industrial temperature

❐ 16-pin small outline integrated circuit (SOIC) package

❐ Restriction of hazardous substances (RoHS) compliant

Overview

The Cypress CY14C256I/CY14B256I/CY14E256I combines a

256-Kbit nvSRAM^[1]with a full-featured RTC in a monolithic

integrated circuit with serial I²C interface. The memory is

organized as 64 K words of 8 bits each. The embedded

nonvolatile elements incorporate the QuantumTrap technology,

creating the world’s most reliable nonvolatile memory. The

SRAM provides infinite read and write cycles, while the

QuantumTrap cells provide highly reliable nonvolatile storage of

data. Data transfers from SRAM to the nonvolatile elements

(STORE operation) takes place automatically at power-down.

On power-up, data is restored to the SRAM from the nonvolatile

memory (RECALL operation). The STORE and RECALL

operations can also be initiated by the user through I²C

commands.

❐ Zero cycle delay reads and writes

■ Write protection

❐ Hardware protection using Write Protect (WP) pin

❐ Software block protection for one-quarter, one-half, or entire

array

Logic Block Diagram

Serial Number

8 x 8

V_CCV_CAP

^RTCcapV_RTCbat

Manufacture ID/

Product ID

Power Control

Block

Memory Control Register

Command Register

QuantrumTrap

32 K x 8

Sleep

STORE

SRAM

32 K x 8

Control Registers Slave

SDA

SCL

A2, A1, A0

I²C Control Logic

Slave Address

Decoder

Memory

Address and Data

Control

RECALL

Memory Slave

RTC Slave

X_in

RTC Control Logic

INT/SQW

X_out

Registers

Counters

Note

1. Serial (I C) nvSRAM will be referred to as nvSRAM throughout the datasheet.

Cypress Semiconductor Corporation

Document #: 001-65230 Rev. *B

•

198 Champion Court

•

San Jose, CA 95134-1709

•

408-943-2600

Revised May 5, 2011

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与CY14B256I相关器件

型号	品牌	获取价格	描述	数据表
CY14B256I-SFXI	CYPRESS	获取价格	256-Kbit (32 K x 8) Serial (I2C) nvSRAM with Real Time Clock Full-featured RTC
CY14B256I-SFXI	INFINEON	获取价格	nvSRAM (non-volatile SRAM)
CY14B256I-SFXIT	CYPRESS	获取价格	256-Kbit (32 K x 8) Serial (I2C) nvSRAM with Real Time Clock Full-featured RTC
CY14B256I-SFXIT	INFINEON	获取价格	nvSRAM (non-volatile SRAM)
CY14B256K	CYPRESS	获取价格	256-Kbit (32K x 8) nvSRAM with Real-Time-Clock
CY14B256K_09	CYPRESS	获取价格	256 Kbit (32K x 8) nvSRAM with Real Time Clock
CY14B256KA	CYPRESS	获取价格	256 Kbit (32K x 8) nvSRAM with Real Time Clock
CY14B256KA_11	CYPRESS	获取价格	256-Kbit (32 K Ã 8) nvSRAM with Real Time Cl
CY14B256KA_12	CYPRESS	获取价格	256-Kbit (32 K Ã 8) nvSRAM with Real Time Cl
CY14B256KA-SP25XI	CYPRESS	获取价格	256 Kbit (32K x 8) nvSRAM with Real Time Clock

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