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DS1318E+

P1-P3P4-P6P7-P9P10-P12P13-P15
General Description
The DS1318 parallel-interface elapsed time counter
(ETC) is a 44-bit counter that maintains the amount of
time that the device operates from main and/or backup
power or during an external event. The internal
frequency of the counter clock is 4.096kHz, which pro-
vides a 244µs resolution and a maximum count of over
136 years. A built-in power-sense circuit detects power
failures, automatically switches to the backup supply,
and controls the timer. If an external event timer is
desired, the control input EXT can control the counter
operation. An open-drain output provides an interrupt,
and a square-wave output provides a programmable
square wave. The DS1318 is accessed through a byte-
wide parallel interface, and operates over the industrial
temperature range.
Applications
Power Meters
Industrial Controls
Servers
Features
♦ Byte-Wide Parallel Interface
♦ 44-Bit Binary Counter Provides Timer with 244µs
Resolution
♦ Automatic Power-Fail Detect and Switch Circuitry
Selects Power Source from the Primary Power
and the Battery, and Write Protects the Internal
Registers
♦ Internal Power-Fail Circuit Allows Timer to
Provide Primary or Battery Operation Times
♦ Timer can Alternately Provide an Event Timer of
Either an Active-High or Active-Low Pulse
♦ Interrupt Output Generated Periodically or When
the Upper 32 Bits of the Counter Match an Alarm
Register
♦ Square-Wave Output with 16 Selectable
Frequencies from 32.768kHz to 0.5Hz
♦ +3.3V Operation
♦ Industrial Temperature Range: -40°C to +85°C
♦ Underwriters Laboratories (UL) Recognized
DS1318
Parallel-Interface Elapsed Time Counter
______________________________________________
Maxim Integrated Products
1
DS1318
GND
24
23
22
21
20
19
18
17
16
15
X1
TOP VIEW
X2
V
BAT
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
TSSOP
(4.4mm)
DQ2
DQ1
DQ0
A0
A1
A2
A3
1
+
2
3
4
5
10
9
8
7
6
11
12
14
13
SQW
IRQ
EXT
GND
Pin Configuration
Ordering Information
DS1318
-
CPU
V
CC
V
CC
DQ–DQ7
A3–A0
GND
RPU
SQW
X1
IRQ
WE
OE
CE
X2
EXT
EXTERNAL
COUNTER
ENABLE
(EVENT TIMER)
0.1μF
V
BAT
Typical Operating Circuit
19-5664; Rev 1; 12/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
DS1318E+ -40°C to +85°C 24 TSSOP
DS1318E+T&R -40°C to +85°C 24 TSSOP
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
DS1318
Parallel-Interface Elapsed Time Counter
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on any Pin Relative to Ground ......-0.3V to +6.0V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow) .......................................+260°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TSSOP (multilayer board)
Junction-to-Ambient Thermal Resistance (θ
JA
) ............72°C/W
Junction-to-Case Thermal Resistance (θ
JC
) .................13°C/W
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
(Note 3) 3.0 3.3 3.6 V
Battery Voltage V
BAT
(Note 3) 1.6 3.3 3.7 V
Logic 1 Voltage V
IH
(Note 3)
0.7 x
V
CC
V
CC
+
0.5
V
Logic 0 Voltage V
IL
(Note 3) -0.5
+0.3 x
V
CC
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic 0 Output Current
(V
OL
= 0.15 x V
CC
)
I
OL
3 mA
Logic 1 Output Current
(V
OH
= 0.85 x V
CC
)
I
OH
1 mA
SQW, INT Logic 0 Output
(V
OL
= 0.15 x V
CC
)
I
OLSI
5 mA
Input Leakage I
LI
(Note 4) 1 μA
I/O Leakage I
LO
(Note 5) -1 +1 μA
Active Supply Current I
CCA
(Note 6) 10 mA
Standby Current I
CCS
(Note 7) 100 150 μA
Battery Input-Leakage Current I
BATLKG
10 100 nA
Power-Fail Voltage V
PF
(Note 3) 2.70 2.97 V
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
DS1318
Parallel-Interface Elapsed Time Counter
_____________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC
(
MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Read Cycle Time t
RC
80 ns
Address Access Time t
AA
80 ns
CE to DQ Low-Z t
CEL
0 ns
CE Access Time t
CEA
80 ns
CE Data Off-Time t
CEZ
30 ns
OE to DQ Low-Z t
OEL
0 ns
OE Access Time t
OEA
70 ns
OE Data Off-Time t
OEZ
30 ns
Output Hold from Address t
OH
5 ns
Write Cycle Time t
WC
80 ns
Address Setup Time t
AS
0 ns
WE Pulse Width t
WEW
40 ns
CE Pulse Width t
CEW
70 ns
Data Setup Time t
DS
40 ns
Data Hold Time t
DH
0 ns
Address Hold Time t
AH
0 ns
WE Data Off-Time t
WEZ
30 ns
Write Recovery Time t
WR
10 ns
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 9) 4 ms
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 3.7V,T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Battery Input Current
(ENOSC = 1)
I
BAT
(Note 8) 750 1100 nA
Battery Input Current
(ENOSC = 0)
I
BATDR
(Note 8) 100 nA
P1-P3P4-P6P7-P9P10-P12P13-P15

DS1318E+

Mfr. #:
Buy DS1318E+
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Parallel-Interface Elapsed Time Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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