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DS1221

Nonvolatile Controller x 4 Chip

FEATURES

PIN ASSIGNMENT

VCCO

VBAT1

*RST

A

B

*RD

*WE

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VCCI

VBAT2

CE

VCC0

CE0 VBAT1

CE1

CE2

CE3

*D/Q

*RST

A

B

*RD

*WE

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

VCCI

VBAT2

CE

CE0

CE1

CE2

CE3

*D/Q

鈥?/div>

Converts CMOS RAMs into nonvolatile memories

鈥?/div>

Data is automatically protected during power loss

鈥?/div>

2-to-4 decoder provides for up to 4 CMOS RAMs

鈥?/div>

Provides for redundant batteries

鈥?/div>

Test battery condition on power-up

鈥?/div>

Full

鹵

10% operating range

鈥?/div>

Unauthorized access can be prevented with optional

security feature

鈥?/div>

16-pin 0.3-inch DIP saves PC board space

鈥?/div>

Optional 16-pin SOIC surface mount package

鈥?/div>

Optional industrial temperature range of

-40擄C to +85擄C available

DS1221 16鈥揚(yáng)in DIP (300 MIL)

DS1221 16鈥揚(yáng)in SOIC (300 MIL)

PIN DESCRIPTION

A, B

CE

CE0 - CE3

V

BAT1

V

BAT2

*RST

V

CCI

V

CCO

*RD

*WE

*D/Q

鈥?/div>

Address Inputs

Chip Enable Input

Chip Enable Outputs

+ Battery 1

+ Battery 2

Reset

+5V Supply

RAM Supply

Read Input

Write Input

Data Input/Output

*Used with optional security circuit only and must be

connected to ground in all other cases.

DESCRIPTION

The DS1221 Nonvolatile Controller x 4 Chip is a CMOS

circuit which solves the application problem of convert-

ing CMOS RAMs into nonvolatile memories. Incoming

power is monitored for an out-of-tolerance condition.

When such a condition is detected , the chip enable out-

puts are inhibited to accomplish write protection and the

battery is switched on to supply RAMs with uninter-

rupted power. An optional security code prevents unau-

thorized users from obtaining access to the memory

space. The nonvolatile controller/decoder circuitry uses

a low-leakage CMOS process which affords precise

voltage detection at extremely low battery consumption.

By combining the DS1221 with up to four CMOS memo-

ries and lithium batteries, nonvolatile operation can be

achieved.

ECopyright

1995 by Dallas Semiconductor Corporation.

patents and other intellectual property rights, please refer to

Dallas Semiconductor databooks.

022194 1/8

標(biāo)準(zhǔn)包裝
1
類別
集成電路 (IC)
家庭
存儲(chǔ)器 - 控制器
系列
-
控制器類型
非易失性 RAM
電源電壓
4.5 V ~ 5.5 V
工作溫度
0°C ~ 70°C
封裝/外殼
16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝
16-SOIC W
包裝
管件

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