DS1556-70IND datasheet, PDF - EEWORLD Datasheet

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DS1556-70IND: DescriptionReal Time Clock 1M NV RAM Timekeeper; CategoryThe embedded processor and controller Microcontrollers and processors; File Size206KB，18 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1556-70IND Overview

Real Time Clock 1M NV RAM Timekeeper

DS1556-70IND Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Maxim
Parts packaging code	MODULE
package instruction	DIP, DIP32,.6
Contacts	32
Reach Compliance Code	not_compliant
ECCN code	EAR99
maximum clock frequency	0.032 MHz
External data bus width	8
Information access methods	PARALLEL, DIRECT ADDRESS
interrupt capability	Y
JESD-30 code	R-PDMA-P32
JESD-609 code	e0
length	43.053 mm
Number of terminals	32
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	DIP
Encapsulate equivalent code	DIP32,.6
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	240
power supply	5 V
Certification status	Not Qualified
Maximum seat height	10.922 mm
Maximum supply voltage	5.5 V
Minimum supply voltage	4.5 V
Nominal supply voltage	5 V
surface mount	NO
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	PIN/PEG
Terminal pitch	2.54 mm
Terminal location	DUAL
shortest time	SECONDS
Maximum time at peak reflow temperature	NOT SPECIFIED
Volatile	NO
width	15.24 mm
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK

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19-5500; Rev 9/10

DS1556

1M, Nonvolatile, Y2K-Compliant

Timekeeping RAM

www.maxim-ic.com

FEATURES



Integrated NV SRAM, Real-Time Clock

(RTC), Crystal, Power-Fail Control Circuit,

and Lithium Energy Source

Clock Registers are Accessed Identically to

the Static RAM; These Registers Reside in

the 16 Top RAM Locations

Century Byte Register (i.e., Y2K Compliant)

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%

Power-Supply Tolerance

Lithium Energy Source is Electrically

Disconnected to Retain Freshness Until

Power is Applied for the First Time

Also Available in Industrial Temperature

Range: -40°C to +85°C

PIN CONFIGURATIONS

TOP VIEW

RST

A16

A14

A12

DQ0

DQ1

DQ2

GND

Maxim

DS1556

A15

IRQ/FT

A13

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3



Encapsulated DIP



IRQ/FT

A15

A16

RST

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

Maxim

DS1556

GND

BAT

N.C.

A14

A13

A12

A11

A10

PowerCap Module Board

(Uses DS9034PCX PowerCap)

Note:

Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here:

www.maxim-ic.com/errata.

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DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

DESCRIPTION

The DS1556 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) with an

RTC alarm, watchdog timer, power-on reset, battery monitor, and 128k x 8 nonvolatile static RAM. User

access to all registers within the DS1556 is accomplished with a byte-wide interface as shown in Figure 1.

The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour

BCD format. Corrections for day of month and leap year are made automatically.

The RTC registers are double-buffered into an internal and external set. The user has direct access to the

external set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow

the user to access static data. Assuming the internal oscillator is turned on, the internal set of registers is

continuously updated, which occurs regardless of external registers settings to guarantee that accurate

RTC information is always maintained.

The DS1556 has interrupt (IRQ/FT) and reset (RST) outputs which can be used to control CPU activity.

The

IRQ/FT

interrupt output can be used to generate an external interrupt when the RTC register values

match user programmed alarm values. The interrupt is always available while the device is powered from

the system supply and can be programmed to occur when in the battery-backed state to serve as a system

wake-up. Either the

IRQ/FT

RST

outputs can also be used as a CPU watchdog timer, CPU activity is

monitored and an interrupt or reset output will be activated if the correct activity is not detected within

programmed limits. The DS1556 power-on reset can be used to detect a system power down or failure

and hold the CPU in a safe reset state until normal power returns and stabilizes; the

RST

output is used

for this function.

The DS1556 also contains its own power-fail circuitry, which automatically deselects the device when the

supply enters an out of tolerance condition. This feature provides a high degree of data security

during unpredictable system operation brought on by low V

levels.

PACKAGES

The DS1556 is available in two packages (32-pin DIP and 34-pin PowerCap module). The 32-pin DIP

style module integrates the crystal, lithium energy source, and silicon all in one package. The 34-pin

PowerCap module board is designed with contacts for connection to a separate PowerCap (DS9034PCX)

that contains the crystal and battery. This design allows the PowerCap to be mounted on top of the

DS1556P after the completion of the surface mount process. Mounting the PowerCap after the surface

mount process prevents damage to the crystal and battery due to the high temperatures required for solder

reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap Module board and PowerCap

are ordered separately and shipped in separate containers. The part number for the PowerCap is

DS9034PCX.

3 of 18

DS1556-70IND Related Products

	DS1556-70IND	DS1556P-70IND
Description	Real Time Clock 1M NV RAM Timekeeper	Real Time Clock
Is it Rohs certified?	incompatible	incompatible
Maker	Maxim	Maxim
Parts packaging code	MODULE	DMA
package instruction	DIP, DIP32,.6	, MODULE,34LEAD,1.0
Contacts	32	34
Reach Compliance Code	not_compliant	not_compliant
ECCN code	EAR99	EAR99
maximum clock frequency	0.032 MHz	0.032 MHz
External data bus width	8	8
Information access methods	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS
interrupt capability	Y	Y
JESD-30 code	R-PDMA-P32	R-XDMA-U34
JESD-609 code	e0	e0
Number of terminals	32	34
Maximum operating temperature	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	UNSPECIFIED
Encapsulate equivalent code	DIP32,.6	MODULE,34LEAD,1.0
Package shape	RECTANGULAR	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	240	240
power supply	5 V	5 V
Certification status	Not Qualified	Not Qualified
Maximum supply voltage	5.5 V	5.5 V
Minimum supply voltage	4.5 V	4.5 V
Nominal supply voltage	5 V	5 V
surface mount	NO	YES
technology	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)	TIN LEAD
Terminal form	PIN/PEG	J INVERTED
Terminal location	DUAL	DUAL
shortest time	SECONDS	SECONDS
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED
Volatile	NO	NO
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK

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