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DS1221S

Description
IC ctrlr/decoder 4bit 16-soic
CategoryPower/power management    The power supply circuit   
File Size133KB,8 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet Parametric Compare View All

DS1221S Overview

IC ctrlr/decoder 4bit 16-soic

DS1221S Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerMaxim
Parts packaging codeSOIC
Contacts16
Reach Compliance Code_compli
JESD-30 codeR-PDSO-G16
JESD-609 codee0
Humidity sensitivity level1
Number of terminals16
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP16,.4
Package shapeRECTANGULAR
Package formSMALL OUTLINE
power supply5 V
Certification statusNot Qualified
Maximum supply current (Isup)80 mA
Nominal supply voltage (Vsup)5 V
surface mountYES
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
DS1221
Nonvolatile Controller x 4 Chip
www.dalsemi.com
NOT RECOMMENDED FOR NEW DESIGNS, SEE DS1321 DATASHEET INSTEAD.
FEATURES
Converts CMOS RAMs into nonvolatile
memories
Data is automatically protected during power loss
2-to-4 decoder provides for up to 4 CMOS
RAMs
Provides for redundant batteries
Test battery condition on power-up
Full ±10% operating range
Unauthorized access can be prevented with
optional security feature
16-pin 0.3-inch DIP saves PC board space
Optional 16-pin SOIC surface mount package
Optional industrial temperature range of
-40°C to +85°C available
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
CE0
CE1
CE2
CE3
*D/Q
DS1221 16-Pin DIP (300-mil)
See Mech. Drawings Section
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
CE0
CE1
CE2
CE3
*D/Q
PIN DESCRIPTION
A, B
CE
CE0
-
CE3
V
BAT1
V
BAT2
*
RST
V
CCI
V
CCO
*
RD
*
WE
*D/Q
- Address Inputs
- Chip Enable Input
- Chip Enable Outputs
- + Battery 1
- + Battery 2
- Reset
- +5V Supply
- RAM Supply
- Read Inpu
- Write Input
- Data Input/Output
DS1221 16-Pin SOIC (300-mil)
See Mech. Drawings Section
*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
converting CMOS RAMs into nonvolatile memories. Incoming power is monitored for an out-of-
tolerance condition. When such a condition is detected, the chip enable outputs are inhibited to
accomplish write protection and the battery is switched on to supply RAMs with uninterrupted power. An
optional security code prevents unauthorized 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
memories and lithium batteries, nonvolatile operation can be achieved.
1 of 8
111899

DS1221S Related Products

DS1221S DS1221SN DS1221 DS1221N
Description IC ctrlr/decoder 4bit 16-soic IC ctrlr/decoder 4bit IN 16-soic IC ctrlr/decoder 4bit 16-dip Power Management Circuit, CMOS, PDIP16
Is it Rohs certified? incompatible incompatible incompatible incompatible
Maker Maxim Maxim Maxim Maxim
Parts packaging code SOIC SOIC DIP DIP
Contacts 16 16 16 16
Reach Compliance Code _compli _compli _compli not_compliant
JESD-30 code R-PDSO-G16 R-PDSO-G16 R-PDIP-T16 R-PDIP-T16
JESD-609 code e0 e0 e0 e0
Number of terminals 16 16 16 16
Maximum operating temperature 70 °C 85 °C 70 °C 85 °C
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP DIP DIP
Encapsulate equivalent code SOP16,.4 SOP16,.4 DIP16,.3 DIP16,.3
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE IN-LINE IN-LINE
power supply 5 V 5 V 5 V 5 V
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
Maximum supply current (Isup) 80 mA 80 mA 80 mA 80 mA
Nominal supply voltage (Vsup) 5 V 5 V 5 V 5 V
surface mount YES YES NO NO
technology CMOS CMOS CMOS CMOS
Temperature level COMMERCIAL INDUSTRIAL COMMERCIAL INDUSTRIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form GULL WING GULL WING THROUGH-HOLE THROUGH-HOLE
Terminal pitch 1.27 mm 1.27 mm 2.54 mm 2.54 mm
Terminal location DUAL DUAL DUAL DUAL
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