DS1218

更新时间： 2024-11-06 22:54:35

品牌	Logo	应用领域
达拉斯 - DALLAS		电源电路电源管理电路光电二极管控制器
页数	文件大小	规格书
4页	53K
描述
Nonvolatile Controller

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中文翻译

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技术参数
数据手册

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DS1218 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	MINI, DIP-8	Reach Compliance Code：	unknown
风险等级：	5.66	Is Samacsys：	N
可调阈值：	NO	模拟集成电路 - 其他类型：	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 代码：	R-PDIP-T8	JESD-609代码：	e0
信道数量：	2	功能数量：	1
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装等效代码：	DIP8,.3
封装形状：	RECTANGULAR	封装形式：	IN-LINE
电源：	5 V	认证状态：	Not Qualified
子类别：	Power Management Circuits	最大供电电流 (Isup)：	70 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	NO
技术：	CMOS	温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
Base Number Matches：	1

DS1218 数据手册

DS1218

Nonvolatile Controller

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ Converts CMOS RAM into nonvolatile

memories

V_CCO

V_CCI

V_BAT

ꢀ Unconditionally write protects when V_CCis

out of tolerance

ꢀ Automatically switches to battery when

power fail occurs

CEO

CEI

GND

ꢀ Space saving 8-pin mini-DIP/8-pin 150 mil

SOIC

ꢀ Consumes less than 100 na of battery current

PIN DESCRIPTION

V_CCI

- Input +5 Volt Supply

V_CCO

- RAM Power (V_CC) Supply

CEI

- Chip Enable Input

- No Connection

CEO

V_BAT

GND

- Chip Enable Output

- + Battery

- Ground

DESCRIPTION

The DS1218 is a CMOS circuit which solves the application problems of converting CMOS RAM into

nonvolatile memory. Incoming power is monitored for an out-of-tolerance condition. When such a

condition is detected, the chip enable output is inhibited to accomplish write protection and the battery is

switched on to supply RAM with uninterrupted power. Special circuitry uses a low-leakage CMOS

process which affords precise voltage detection at extremely low battery consumption. The 8-pin mini-

DIP package keeps PC board real estate requirements to a minimum. By combining the DS1218

nonvolatile controller chip with a full CMOS memory and lithium batteries, 10 years of nonvolatile RAM

operation can be achieved.

OPERATION

The DS1218 Nonvolatile Controller performs the circuit functions required to battery back-up a RAM.

First, a switch is provided to direct power from the battery or V_CCIsupply, depending on which is greater.

This switch has a voltage drop of less than 0.2V. The second function which the nonvolatile controller

provides is power-fail detection. The DS1218 constantly monitors the V_CCsupply. When V_CCIfalls to

1.26 times the battery voltage, a precision comparator outputs a power-fail detect signal to the chip enable

logic. The third function of write protection is accomplished by holding the chip enable output signal to

within 0.2V of the V_CCIor battery supply, when a power-fail condition is detected.

During nominal supply conditions, the chip enable output will follow chip enable input with a maximum

propagation delay of 10 ns.

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与DS1218相关器件

型号	品牌	获取价格	描述	数据表
DS1218+	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 2 Channel, CMOS, PDIP8, MINI, DIP-8
DS1218+	ROCHESTER	获取价格	2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8, MINI, DIP-8
DS1218S	DALLAS	获取价格	Nonvolatile Controller
DS1218S/T&R	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 2 Channel, CMOS, PDSO8, 0.150 INCH, SOIC-8
DS1218S+	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 2 Channel, CMOS, PDSO8, 0.150 INCH, SOIC-8
DS1218S+T&R	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 2 Channel, CMOS, PDSO8, 0.150 INCH, SOIC-8
DS1220	DALLAS	获取价格	16k Nonvolatile SRAM
DS1220	TTELEC	获取价格	Platon Metal Tube GMT Flanged VA Flow Meter
DS1220AB	DALLAS	获取价格	16k Nonvolatile SRAM
DS1220AB	ADI	获取价格	16k非易失SRAM

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