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DS1211S-

Description
Memory Controllers Controller X 8 Chip Nonvolatile
Categorystorage   
File Size13KB,1 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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DS1211S- Overview

Memory Controllers Controller X 8 Chip Nonvolatile

DS1211S- Parametric

Parameter NameAttribute value
Product CategoryMemory Controllers
ManufacturerMaxim
RoHSDetails
Memory TypeNonvolatile RAM - NVRAM
Battery Backup SwitchingYes
Supply Voltage - Max5.25 V
Supply Voltage - Min4.75 V
Operating Supply Current100 nA
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 85 C
Mounting StyleSMD/SMT
Package / CaseSOIC-20
PackagingTube
Description/FunctionConverts Full CMOS RAMs into Nonvolatile Memories
Height2.35 mm
Length12.6 mm
Lithium Battery MonitorYes
Number of Memory Channels8
Operating Supply Voltage5 V
Factory Pack Quantity37
TypeNon-Volatile RAM (NVRAM)
Width7.4 mm
Unit Weight0.028254 oz
DS1211
Nonvolatile Controller x 8 Chip
www.dalsemi.com
FEATURES
Converts full CMOS RAMs into nonvolatile
memories
Unconditionally write protects when V
CC
is
out of tolerance
Automatically switches to battery when
power-fail occurs
3 to 8 decoder provides control for up to eight
CMOS RAMs
Consumes less than 100 nA of battery current
Tests battery condition on power-up
Provides for redundant batteries
Power-fail signal can be used to interrupt
processor on power failure
Optional 5% or 10% power-fail detection
Optional 20-pin SOIC surface mount package
Optional industrial temperature range of
-40°C to +85°C
PIN ASSIGNMENT
VBAT1
VCCO
TOL
PF
CE7
CE6
C
B
A
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCCI
VBAT2
CE
CE0
CE1
CE2
CE3
NC
CE4
CE5
VBAT1
VCCO
TOL
PF
CE7
CE6
C
B
A
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCCI
VBAT2
CE
CE0
CE1
CE2
CE3
NC
CE4
CE5
20-Pin DIP (300-mil)
See Mech. Drawings
Section
20-Pin SOIC (300-mil)
See Mech. Drawings
Section
PIN DESCRIPTION
A, B, C
CE
CE0
- Address Inputs
- Chip Enable Input
- Chip Enable Outputs
- Ground
- + Battery 1
- + Battery 2
- Power Supply Tolerance
- +5V Supply
- RAM Supply
- Power-fail
- No Connection
-
CE7
GND
V
BAT1
V
BAT2
TOL
V
CCI
V
CC0
PF
NC
DESCRIPTION
The DS1211 Nonvolatile Controller x 8 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 enables are inhibited to accomplish write
protection and the battery is switched on to supply RAMs with uninterrupted power. Special circuitry
uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery
consumption.
By combining the DS1211 nonvolatile controller/decoder chip and lithium batteries, nonvolatile RAM
operation can be achieved for up to eight CMOS memories.
See the data sheet for the DS1212 Nonvolatile Controller x 16 Chip for electrical specifications and
operation.
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DS1211S- Related Products

DS1211S- DS1211SN-TR DS1211N- DS1211S-TR DS1211SN-
Description Memory Controllers Controller X 8 Chip Nonvolatile Memory Controllers Memory Controllers Controller X 8 Chip Nonvolatile Memory Controllers Memory Controllers Controller X 8 Chip Nonvolatile
Product Category Memory Controllers Memory Controllers Memory Controllers Memory Controllers Memory Controllers
Manufacturer Maxim Maxim Maxim Maxim Maxim
RoHS Details - Details - Details
Memory Type Nonvolatile RAM - NVRAM - Nonvolatile RAM - NVRAM Nonvolatile RAM - NVRAM Nonvolatile RAM - NVRAM
Battery Backup Switching Yes - Yes Yes Yes
Supply Voltage - Max 5.25 V - 5.25 V 5.25 V 5.25 V
Supply Voltage - Min 4.75 V - 4.75 V 4.75 V 4.75 V
Operating Supply Current 100 nA - 100 nA 100 nA 100 nA
Minimum Operating Temperature - 40 C - - 40 C 0 C - 40 C
Maximum Operating Temperature + 85 C - + 85 C + 70 C + 85 C
Mounting Style SMD/SMT - Through Hole SMD/SMT SMD/SMT
Package / Case SOIC-20 - PDIP-20 SOIC-20 SOIC-20
Packaging Tube - Tube - Tube
Description/Function Converts Full CMOS RAMs into Nonvolatile Memories - Converts Full CMOS RAMs into Nonvolatile Memories Converts Full CMOS RAMs into Nonvolatile Memories Converts Full CMOS RAMs into Nonvolatile Memories
Height 2.35 mm - 3.18 mm 2.35 mm 2.35 mm
Length 12.6 mm - 25.78 mm 12.6 mm 12.6 mm
Lithium Battery Monitor Yes - Yes Yes Yes
Number of Memory Channels 8 - 8 8 8
Operating Supply Voltage 5 V - 5 V 5 V 5 V
Factory Pack Quantity 37 - 18 - 37
Type Non-Volatile RAM (NVRAM) - Non-Volatile RAM (NVRAM) Non-Volatile RAM (NVRAM) Non-Volatile RAM (NVRAM)
Width 7.4 mm - 6.1 mm 7.4 mm 7.4 mm
Unit Weight 0.028254 oz - 0.079719 oz 0.028254 oz 0.028254 oz
Product Attribute - - Attribute Value Attribute Value Attribute Value
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