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参数资料
| 型号： | DS1218S+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/7页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER NV 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 控制器类型： | 非易失性 RAM |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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FEATURES
Converts CMOS RAM into nonvolatile
memories
Unconditionally write protects when VCC is
out of tolerance
Automatically switches to battery when
power fail occurs
Space saving 8-pin PDIP or 8-pin 150 mil SO
Packages
Consumes less than 100nA of battery current
PIN ASSIGNMENT
PIN DESCRIPTION
VCCI
- Input +5 Volt Supply
VCCO
- RAM Power (VCC) Supply
CEI
- Chip Enable Input
NC
- No Connection
CEO
- Chip Enable Output
VBAT
- + Battery
GND
- 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 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 VCCI supply, 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 VCC supply. When VCCI falls 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 VCCI or 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.
DS1218
Nonvolatile Controller
VCCO
NC
GND
VCCI
VBAT
CEO
CEI
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8
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19-6295; Rev 6/12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS122 | 制造商:Miyama Electric 功能描述: |
| DS1220 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:16k Nonvolatile SRAM |
| DS1220AB | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:16k Nonvolatile SRAM |
| DS1220AB/AD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:16k Nonvolatile SRAM |
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