DS1314S-2+T&R Maxim Integrated Products, DS1314S-2+T&R Datasheet

IC CTRLR NV W/BATT MON 3V 8-SOIC

DS1314S-2+T&R

Manufacturer Part Number
DS1314S-2+T&R
Description
IC CTRLR NV W/BATT MON 3V 8-SOIC
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS1314S-2+T&R

Controller Type
Nonvolatile RAM
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
§ Converts CMOS SRAM into nonvolatile
§ Unconditionally write-protects SRAM when
§ Automatically switches to battery backup
§ Monitors voltage of a lithium cell and
§ Signals low-battery condition on active low
§ Automatic V
§ Space-saving 8-pin DIP and SOIC packages
§ Optional 16-pin SOIC and 20-pin TSSOP
§ Industrial temperature range of -40°C to
DESCRIPTION
The DS1314 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application
problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-
of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write
protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry
uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery
consumption.
www.maxim-ic.com
memory
V
supply when V
provides advanced warning of impending
battery failure
Battery Warning output signal
or 3.3V power supplies
versions reset processor when power failure
occurs and hold processor in reset during
system power-up
+85°C
CC
is out of tolerance
CC
CC
power-fail detection for 3.0V
power failure occurs
1 of 11
GND
V
V
TOL
GND
V
V
TOL
NC
CCO
NC
NC
NC
BAT
CCO
BAT
DS1314S 16-Pin SOIC
DS1314 8-Pin DIP
PIN ASSIGNMENT
PIN DESCRIPTION
V
V
V
TOL
GND
NC
CEI
CEO
BW
RST
CCI
CCO
BAT
1
2
3
4
1
2
3
4
5
6
7
8
(300-mil)
(300-mil)
3V Nonvolatile Controller with
16
15
14
13
12
10
11
8
7
6
5
9
V
BW
CEO
CEI
- Power Supply Input
- SRAM Power Supply Output
- Backup Battery Input
- Chip Enable Input
- Chip Enable Output
- V
- Battery Warning Output
- Reset Output (Open Drain)
- Ground
- No Connection
NC
V
RST
NC
BW
CEO
NC
CEI
CCI
Lithium Battery Monitor
CCI
(Open Drain)
CC
Tolerance Select
GND
V
GND
V
TOL
V
V
TOL
CCO
BAT
NC
CCO
NC
NC
NC
NC
BAT
NC
DS1314E 20-Pin TSSOP
DS1314S-2 8-Pin SOIC
1
2
3
4
5
6
7
8
9
10
1
2
3
4
(150-mil)
DS1314
13
20
19
18
17
16
15
14
12
11
8
7
6
5
070505
NC
V
RST
NC
NC
BW
NC
CEO
NC
CEI
V
BW
CEO
CEI
CCI
CCI

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DS1314S-2+T&R Summary of contents

Page 1

... Chip Enable Input CEI - Chip Enable Output CEO TOL - V Tolerance Select CC - Battery Warning Output BW (Open Drain) - Reset Output (Open Drain) RST GND - Ground Connection DS1314 CCO CCI BAT 3 6 CEO 5 4 CEI DS1314S-2 8-Pin SOIC (150-mil CCO CCI RST BAT CEO ...

Page 2

In addition to battery-backup support, the DS1314 performs the important function of monitoring the remaining capacity of the lithium battery and providing a warning before the battery reaches end-of-life. Because the open-circuit voltage of a lithium backup battery remains relatively ...

Page 3

... POWER MONITORING DS1314S and DS1314E varieties have an additional reset pin. These varieties detect out-of-tolerance power supply conditions and warn a processor-based system of impending power failure. When V below the trip point level defined by the TOL pin (V ...

Page 4

FUNCTIONAL BLOCK DIAGRAM Figure ...

Page 5

ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the ...

Page 6

CAPACITANCE PARAMETER Input Capacitance ( , TOL) CEI Output Capacitance ( , , ) CEO BW RST AC ELECTRICAL CHARACTERISTICS PARAMETER to Propagation Delay CEI CEO Pulse Width CE V Valid to End of CC Write Protection V Valid to ...

Page 7

TIMING DIAGRAM: POWER-UP NOTE < will begin to slew with V BAT SW CCO when CCI CCI BAT ...

Page 8

TIMING DIAGRAM: POWER-DOWN NOTE < will slew down with V BAT SW CCO until CCI CCI BAT ...

Page 9

TIMING DIAGRAM: BATTERY WARNING DETECTION NOTE measured from the expiration of the internal timer to the activation of the battery warning output TIMING DIAGRAM: BATTERY REPLACEMENT ...

Page 10

NOTES: 1. All voltages referenced to ground. 2. Measured with outputs open circuited the maximum average load which the DS1314 can supply to attached memories at V CCO1 V -0.2V. CCI the maximum average ...

Page 11

DATA SHEET REVISION SUMMARY The following represent the key differences between 12/16/96 and 06/12/97 version of the DS1314 data sheet. Please review this summary carefully. 1. Changed V max to 6V. BAT 2. Changed V values to 2.8 - 3.0V ...

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