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DS1387

Description
RAMified Real Time Clock 4K x 8
CategoryThe embedded processor and controller    Microcontrollers and processors   
File Size99KB,20 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
Download Datasheet Parametric Compare View All

DS1387 Overview

RAMified Real Time Clock 4K x 8

DS1387 Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerDALLAS
Reach Compliance Codeunknow
Other featuresDAYLIGHT SAVINGS OPTION; 10 YEARS DATA RETENTION
External data bus width8
Information access methodsPARALLEL, MUXED BUS
interrupt capabilityY
JESD-30 codeR-PDIP-T24
JESD-609 codee0
Number of terminals24
Number of timers1
On-chip data RAM width8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output clock frequency0.008192 MHz
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP24,.6
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply5 V
Certification statusNot Qualified
RAM (number of words)50
Maximum slew rate50 mA
Maximum supply voltage5.5 V
Minimum supply voltage4.5 V
Nominal supply voltage5 V
surface mountNO
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
shortest timeSECONDS
Maximum time at peak reflow temperatureNOT SPECIFIED
VolatileNO
uPs/uCs/peripheral integrated circuit typeTIMER, REAL TIME CLOCK
DS1385/DS1387
DS1385/DS1387
RAMified Real Time Clock 4K x 8
FEATURES
PIN ASSIGNMENT
OER
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
SQW
AS0
AS1
V
BAT
IRQ
WER
RD
GND
WR
ALE
CS
OER
NC
NC
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
SQW
AS0
AS1
NC
IRQ
WER
RD
NC
WR
ALE
CS
Upgraded
IBM AT computer clock/calendar with
4K x 8 extended RAM
the absence of power
Totally nonvolatile with over 10 years of operation in
Counts seconds, minutes, hours,
day of the week,
date, month and year with leap year compensation
alarm
Binary or BCD representations of time, calendar and
12–
or 24–hour clock with AM and PM in 12–hour
mode
Daylight Savings Time option
Multiplex bus for pin efficiency
Interfaced with
software as 64 user RAM locations
plus 4K x 8 of static RAM
– 14–bytes of clock and control registers
– 50–bytes of general purpose RAM
– 4K x 8 SRAM accessible by using separate con-
trol pins
DS1385 24–PIN DIP
(600 MIL)
DS1387 24–PIN
ENCAPSULATED PACKAGE
(740 MIL FLUSH)
OER
X1
X2
NC
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
NC
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
SQW
NC
AS0
AS1
V
BAT
IRQ
WER
RD
BGND
WR
ALE
CS
NC
Programmable square wave output signal
Bus–compatible interrupt signals (IRQ)
Three interrupts
and testable:
– Time–of–day alarm once/second to once/day
– Periodic rates from 122
µs
to 500 ms
– End–of–clock update cycle
are separately software–maskable
Available
as chip (DS1385 or DS1385S) or stand
alone module with embedded lithium battery and
crystal (DS1387)
DS1385S 28–PIN SOIC
(330 MIL)
ORDERING INFORMATION
DS1385
DS1385S
DS1387
RTC Chip; 24–pin DIP
RTC Chip; 28–pin SOIC
RTC Module; 24–pin DIP
ECopyright
1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
012496 1/20

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DS1387 DS1385 DS1385S
Description RAMified Real Time Clock 4K x 8 RAMified Real Time Clock 4K x 8 RAMified Real Time Clock 4K x 8
Is it Rohs certified? incompatible incompatible incompatible
Maker DALLAS DALLAS DALLAS
Reach Compliance Code unknow unknow unknow
Other features DAYLIGHT SAVINGS OPTION; 10 YEARS DATA RETENTION DAYLIGHT SAVINGS OPTION DAYLIGHT SAVINGS OPTION
External data bus width 8 8 8
Information access methods PARALLEL, MUXED BUS PARALLEL, MUXED BUS PARALLEL, MUXED BUS
interrupt capability Y Y Y
JESD-30 code R-PDIP-T24 R-PDIP-T24 R-PDSO-G28
JESD-609 code e0 e0 e0
Number of terminals 24 24 28
Number of timers 1 1 1
On-chip data RAM width 8 8 8
Maximum operating temperature 70 °C 70 °C 70 °C
Maximum output clock frequency 0.008192 MHz 0.008192 MHz 0.008192 MHz
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code DIP DIP SOP
Encapsulate equivalent code DIP24,.6 DIP24,.6 SOP28,.5
Package shape RECTANGULAR RECTANGULAR RECTANGULAR
Package form IN-LINE IN-LINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
power supply 5 V 5 V 5 V
Certification status Not Qualified Not Qualified Not Qualified
RAM (number of words) 50 50 50
Maximum slew rate 50 mA 50 mA 50 mA
Maximum supply voltage 5.5 V 5.5 V 5.5 V
Minimum supply voltage 4.5 V 4.5 V 4.5 V
Nominal supply voltage 5 V 5 V 5 V
surface mount NO NO YES
technology CMOS CMOS CMOS
Temperature level COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form THROUGH-HOLE THROUGH-HOLE GULL WING
Terminal pitch 2.54 mm 2.54 mm 1.27 mm
Terminal location DUAL DUAL DUAL
shortest time SECONDS SECONDS SECONDS
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Volatile NO YES YES
uPs/uCs/peripheral integrated circuit type TIMER, REAL TIME CLOCK TIMER, REAL TIME CLOCK TIMER, REAL TIME CLOCK
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