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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1218 Datasheet

Nonvolatile Controller

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19-6295; Rev 6/12
DS1218
Nonvolatile Controller
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
VCCO
NC
NC
GND
1
2
3
4
8 VCCI
7 VBAT
6 CEO
5 CEI
PIN DESCRIPTION
VCCI - Input +5 Volt Supply
VCCO
- RAM Power (VCC) Supply
CEI - Chip Enable Input
NC - No Connection
CEO
VBAT
GND
- Chip Enable Output
- + Battery
- 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.
1 of 7


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1218 Datasheet

Nonvolatile Controller

No Preview Available !

ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground
Operating Temperature Range
Storage Temperature Range
Soldering Temperature (reflow, SO)
Lead Temperature (soldering, 10s)
-0.5V to +7.0V
0°C to +70°C
-55°C to +125°C
+260°C
+300°C
DS1218
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the
operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of
time may affect reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
PDIP
Junction-to-Ambient Thermal Resistance (θJA).…………………...……………………....110°C/W
Junction-to-Case Thermal Resistance (θJC)…………………………………………………40°C/W
SO
Junction-to-Ambient Thermal Resistance (θJA).…………………………………………...136°C/W
Junction-to-Case Thermal Resistance (θJC)…………………………………………………38°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board for the SO. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL MIN
Supply
VCCI
4.5
Logic 1
VIH 2.0
Logic 0
VIL -0.3
Battery Supply
VBAT
2.5
TYP
5.0
3.0
MAX
5.5
5.5
0.8
3.5
(0°C to +70°C)
UNITS NOTES
V2
V2
V2
V2
DC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL MIN
Active Current
ICCI
Battery Current
IBAT
RAM Current
ICCO
(VCCO1 VCCI -0.3V)
RAM Current
ICCO
(VCCO VCCI -0.2V)
Input Leakage
IIL -1.0
CEO Output @ 2.4V
IOH -1.0
CEO Output @ 0.4V
IOL
VCC Trip Point
VCCTP
CAPACITANCE
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
CIN
COUT
MIN
2 of 7
(0°C to +70°C; VCCI = 5V ± 10%)
TYP
MAX UNITS NOTES
2
5 mA
4
100 nA
4, 5
80 mA
6
70 mA
1.26xVBAT
TYP
+1.0
4.0
MAX
5
7
µA
mA
mA
(TA = +25°C)
UNITS NOTES
pF
pF


Part Number DS1218
Description Nonvolatile Controller
Maker Maxim Integrated
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DS1218 Datasheet PDF






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