DS1556W-120- datasheet, PDF - EEWORLD Datasheet

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DS1556W-120-: DescriptionReal Time Clock 1M NV RAM Timekeeper; Categorysemiconductor Analog mixed-signal IC; File Size206KB，18 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1556W-120- Overview

Real Time Clock 1M NV RAM Timekeeper

DS1556W-120- Parametric

Parameter Name	Attribute value
Product Category	Real Time Clock
Manufacturer	Maxim
RoHS	Details
Mounting Style	Through Hole
Package / Case	eDIP
RTC Bus Interface	Parallel
Time Format	HH:MM:SS
RTC Memory Size	131072 B
Supply Voltage - Max	3.63 V
Supply Voltage - Min	2.97 V
Maximum Operating Temperature	+ 70 C
Minimum Operating Temperature	0 C
Packaging	Tube
Function	Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper
Product	Real Time Clocks
Factory Pack Quantity	11

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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.

1 of 18

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

DS1556W-120- Related Products

	DS1556W-120-	DS1556WP-120IND-	DS1556-70-	DS1556WP-120-
Description	Real Time Clock 1M NV RAM Timekeeper	Multilayer Ceramic Capacitors MLCC - SMD/SMT CKG57N 10uF 100volt X7R 20%	LED Display Drivers 8-Digit LED Display Driver	Real Time Clock 1M NV RAM Timekeeper
Product Category	Real Time Clock	Real Time Clock	Real Time Clock	Real Time Clock
Manufacturer	Maxim	Maxim	Maxim	Maxim
RoHS	Details	Details	Details	Details
Mounting Style	Through Hole	SMD/SMT	Through Hole	SMD/SMT
Package / Case	eDIP	PowerCap-34	EDIP-32	PowerCap Module-34
RTC Bus Interface	Parallel	Parallel	Parallel	Parallel
Time Format	HH:MM:SS	HH:MM:SS	HH:MM:SS	HH:MM:SS
RTC Memory Size	131072 B	131072 B	128 kB	128 kB
Supply Voltage - Max	3.63 V	3.63 V	5.5 V	3.63 V
Supply Voltage - Min	2.97 V	2.97 V	4.5 V	2.97 V
Maximum Operating Temperature	+ 70 C	+ 85 C	+ 70 C	+ 70 C
Minimum Operating Temperature	0 C	- 40 C	0 C	0 C
Packaging	Tube	Tube	Tube	Tube
Function	Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper	Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper	Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper	Calendar, Clock, NV Timekeeping RAM, Watchdog Timekeeper
Product	Real Time Clocks	Real Time Clocks	Real Time Clocks	Real Time Clocks
Factory Pack Quantity	11	40	11	40

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