DS1318 Datasheet PDF - Dallas Semiconducotr
| Part Number | DS1318 | |
| Description | Parallel-Interface Elapsed Time Counter | |
| Manufacturers | Dallas Semiconducotr | |
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Rev 0; 2/04
Parallel-Interface Elapsed Time Counter
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.
Power Meters
Industrial Controls
Servers
Applications
Typical Operating Circuit
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
PART
DS1318
Ordering Information
TEMP RANGE
PIN-
PACKAGE
-40°C to +85°C
24 TSSOP,
4.4mm
TOP MARK
DS1318
Pin Configuration
VCC
RPU
VCC
SQW
IRQ
WE EXT
OE
CPU
CE
DS1318
VBAT
A3–A0
X1
DQ–DQ7
GND X2
0.1µF
EXTERNAL
COUNTER
ENABLE
(EVENT TIMER)
TOP VIEW
X1
X2
GND
EXT
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
1
2
3
4
5
6
7
8
9
10
11
12
DS1318
TSSOP
24 VCC
23 VBAT
22 IRQ
21 SQW
20 WE
19 OE
18 CE
17 DQ7
16 DQ6
15 DQ5
14 DQ4
13 DQ3
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Parallel-Interface Elapsed Time Counter
Power-Up/Power-Down Timing
VCC
VPF(MAX)
VPF(MIN)
tVCCF
tVCCR
tREC
INPUTS
RECOGNIZED
OUTPUTS
VALID
DON'T CARE
HIGH-Z
RECOGNIZED
VALID
POWER-UP/POWER-DOWN CHARACTERISTICS
(TA = -40°C to +85°C) (Note 1)
PARAMETER
Recovery at Power-Up
SYMBOL
tREC (Note 9)
CONDITIONS
VCC Fall Time; VPF(MAX) to
VPF(MIN)
tVCCF
VCC Rise Time; VPF(MIN) to
VPF(MAX)
tVCCR
CAPACITANCE
(TA = +25°C)
PARAMETER
Capacitance on All Input Pins
Capacitance on IRQ, SQW, and
DQ Pins
SYMBOL
CIN
CIO
CONDITIONS
MIN TYP MAX UNITS
150 ms
300 µs
0 µs
MIN TYP MAX UNITS
10 pF
10 pF
_____________________________________________________________________ 5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DS1318 electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS1318.PDF Datasheet ] | |
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