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DS1556W

Description
Real Time Clock, Non-Volatile, CMOS, PLASTIC, MODULE, DIP-32
CategoryThe embedded processor and controller    Microcontrollers and processors   
File Size201KB,20 Pages
ManufacturerDALLAS
Websitehttp://www.dalsemi.com
Download Datasheet Parametric Compare View All

DS1556W Overview

Real Time Clock, Non-Volatile, CMOS, PLASTIC, MODULE, DIP-32

DS1556W Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerDALLAS
package instructionPLASTIC, MODULE, DIP-32
Reach Compliance Codeunknown
maximum clock frequency0.032 MHz
External data bus width8
Information access methodsPARALLEL, DIRECT ADDRESS
interrupt capabilityY
JESD-30 codeR-XDMA-P32
JESD-609 codee0
Number of terminals32
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialUNSPECIFIED
encapsulated codeDIP
Encapsulate equivalent codeDIP32,.6
Package shapeRECTANGULAR
Package formMICROELECTRONIC ASSEMBLY
power supply3.3 V
Certification statusNot Qualified
Maximum supply voltage3.63 V
Minimum supply voltage2.97 V
Nominal supply voltage3.3 V
surface mountNO
technologyCMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formPIN/PEG
Terminal pitch2.54 mm
Terminal locationDUAL
shortest timeSECONDS
VolatileNO
uPs/uCs/peripheral integrated circuit typeTIMER, REAL TIME CLOCK
Base Number Matches1
DS1556
1MEG NV Y2KC Timekeeping RAM
www.dalsemi.com
FEATURES
Integrated NV SRAM, real time clock,
crystal, power-fail control circuit and lithium
energy source
Clock registers are accessed identically to the
static RAM; these registers are resident in the
16 top RAM locations
Century byte register; i.e., Y2K complaint
Totally nonvolatile with over 10 years of
operation in the absence of power
Precision power-on reset
Programmable watchdog timer and RTC
alarm
BCD coded year, month, date, day, hours,
minutes, and seconds with automatic leap
year compensation valid up to the year 2100
Battery voltage level indicator flag
Power-fail write protection allows for
±10%
V
CC
power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
RST
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
GND
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
CC
A15
IRQ/FT
WE
A13
A8
A9
A11
OE
A10
CE
DQ7
DQ6
DQ5
DQ4
DQ3
32-Pin Encapsulated Package
IRQ/FT
A15
A16
RST
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
X1
GND V
BAT
X2
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
NC
NC
A14
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
34-Pin PowerCap
®
Module Board
(Uses DS9034PCX PowerCap)
1 of 20
022101

DS1556W Related Products

DS1556W DS1556WP DS1556P
Description Real Time Clock, Non-Volatile, CMOS, PLASTIC, MODULE, DIP-32 Real Time Clock, Non-Volatile, CMOS, POWERCAP MODULE-34 Real Time Clock, Non-Volatile, CMOS, POWERCAP MODULE-34
package instruction PLASTIC, MODULE, DIP-32 POWERCAP MODULE-34 POWERCAP MODULE-34
Reach Compliance Code unknown unknown unknown
maximum clock frequency 0.032 MHz 0.032 MHz 0.032 MHz
External data bus width 8 8 8
Information access methods PARALLEL, DIRECT ADDRESS PARALLEL, DIRECT ADDRESS PARALLEL, DIRECT ADDRESS
interrupt capability Y Y Y
JESD-30 code R-XDMA-P32 R-XDMA-U34 R-XDMA-U34
Number of terminals 32 34 34
Maximum operating temperature 70 °C 70 °C 70 °C
Package body material UNSPECIFIED UNSPECIFIED UNSPECIFIED
Encapsulate equivalent code DIP32,.6 MODULE,34LEAD,1.0 MODULE,34LEAD,1.0
Package shape RECTANGULAR RECTANGULAR RECTANGULAR
Package form MICROELECTRONIC ASSEMBLY MICROELECTRONIC ASSEMBLY MICROELECTRONIC ASSEMBLY
power supply 3.3 V 3.3 V 5 V
Certification status Not Qualified Not Qualified Not Qualified
Maximum supply voltage 3.63 V 3.63 V 5.5 V
Minimum supply voltage 2.97 V 2.97 V 4.5 V
Nominal supply voltage 3.3 V 3.3 V 5 V
surface mount NO YES YES
technology CMOS CMOS CMOS
Temperature level COMMERCIAL COMMERCIAL COMMERCIAL
Terminal form PIN/PEG J INVERTED J INVERTED
Terminal location DUAL DUAL DUAL
shortest time SECONDS SECONDS SECONDS
Volatile NO NO NO
uPs/uCs/peripheral integrated circuit type TIMER, REAL TIME CLOCK TIMER, REAL TIME CLOCK TIMER, REAL TIME CLOCK
Base Number Matches 1 1 1
Maker DALLAS DALLAS -
Other features - A POWERCAP MODULE CONTAINING CRYSTAL AND BATTERY REQUIRED A POWERCAP MODULE CONTAINING CRYSTAL AND BATTERY REQUIRED
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