DS1647-120 datasheet, PDF - EEWORLD Datasheet

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DS1647-120: DescriptionReal Time Clock; CategoryThe embedded processor and controller Microcontrollers and processors; File Size178KB，12 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1647-120 Overview

Real Time Clock

DS1647-120 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Maxim
Parts packaging code	DIP
package instruction	ENCAPSULATED, DIP-32
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
JESD-30 code	R-XDIP-P32
JESD-609 code	e0
length	43.053 mm
Humidity sensitivity level	1
Number of terminals	32
Number of timers
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	UNSPECIFIED
encapsulated code	DIP
Package shape	RECTANGULAR
Package form	IN-LINE
Peak Reflow Temperature (Celsius)	240
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	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	PIN/PEG
Terminal pitch	2.54 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	15.24 mm
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK
Base Number Matches	1

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19-5596; Rev 10/10

DS1647/DS1647P

Nonvolatile Timekeeping RAM

www.maxim-ic.com

FEATURES



Integrates 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 Eight Top RAM Locations.

Totally Nonvolatile with Over 10 Years of

Operation in the Absence of Power

BCD Coded Year, Month, Date, Day, Hours,

Minutes, and Seconds with Leap Year

Compensation Valid Through 2099

Power-Fail Write Protection Allows for

±10% V

Power-Supply Tolerance

DS1647 Only (DIP Module):

Standard JEDEC Byte-Wide 128k x 8 RAM

Pinout

DS1647P Only (PowerCap Module Board):

Surface Mountable Package for Direct

Connection to PowerCap Containing

Battery and Crystal

Replaceable Battery (PowerCap)

Power-Fail Output

Pin-for-Pin Compatible with Other Densities

of DS164XP Timekeeping RAM

PIN CONFIGURATIONS

TOP VIEW

A18

A16

A14

A12

DQ0

DQ1

DQ2

GND

DS1647

A15

A17

A13

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3



32-Pin Encapsulated DIP Package

(32 Pin 740)



ORDERING INFORMATION

PART

DS1647-120+

DS1647P-120+

TEMP

RANGE

0°C to

+70°C

0°C to

+70°C

PIN-

PACKAGE

32 EDIP

(0.740a)

PowerCap*

TOP

MARK**

DS1647+120

DS1647P+120

N.C.

A15

A16

PFO

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

DS1647P

GND V

BAT

A18

A17

A14

A13

A12

A11

A10

34-Pin PowerCap Module Board

(Uses DS9034PCX+ or DS9034I-PCX+ PowerCap)

+Denotes a lead(Pb)-free/RoHS-compliant package.

*DS9034PCX+ or DS9034I-PCX+ required (must be ordered separately).

**A “+” indicates lead(Pb)-free. The top mark includes a “+” symbol on lead(Pb)-free devices.

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DS1647/DS1647P

DESCRIPTION

The DS1647 is a 512k x 8 nonvolatile static RAM with a full-function real-time clock, which are both

accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to any

JEDEC standard 512k x 8 SRAM. The device can also be easily substituted for ROM, EPROM and

EEPROM, providing read/write nonvolatility and the addition of the real-time clock function. The real-

time clock information resides in the eight uppermost RAM locations. The RTC registers contain year,

month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day of the

month and leap year are made automatically. The RTC clock registers are double-buffered to avoid access

of incorrect data that can occur during clock update cycles. The double-buffered system also prevents

time loss as the timekeeping countdown continues unabated by access to time register data. The DS1647

also contains its own power-fail circuitry, which deselects the device when the V

supply is in an out-of-

tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by

low V

as errant access and update cycles are avoided.

PACKAGES

The DS1647 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

DS1647P 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.

CLOCK OPERATIONS—READING THE CLOCK

While the double-buffered register structure reduces the chance of reading incorrect data, internal updates

to the DS1647 clock registers should be halted before clock data is read to prevent reading of data in

transition. However, halting the internal clock register updating process does not affect clock accuracy.

Updating is halted when a 1 is written into the read bit, the 7th most significant bit in the control register.

As long as 1 remains in that position, updating is halted. After a halt is issued, the registers reflect the

count, that is day, date, and time that was present at the moment the halt command was issued. However,

the internal clock registers of the double-buffered system continue to update so that clock accuracy is not

affected by the access of data. All of the DS1647 registers are updated simultaneously after the clock

status is reset. Updating is within a second after the read bit is written to 0.

The read bit must be a zero for a minimum of 500µs to ensure that the external registers are updated.

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DS1647-120 Related Products

	DS1647-120	DS1647P-120
Description	Real Time Clock	Real Time Clock NV Timekeeping RAM
Is it Rohs certified?	incompatible	incompatible
Maker	Maxim	Maxim
Parts packaging code	DIP	DMA
package instruction	ENCAPSULATED, DIP-32	POWERCAP MODULE-34
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
JESD-30 code	R-XDIP-P32	R-XDMA-U34
JESD-609 code	e0	e0
Humidity sensitivity level	1	1
Number of terminals	32	34
Maximum operating temperature	70 °C	70 °C
Package body material	UNSPECIFIED	UNSPECIFIED
Package shape	RECTANGULAR	RECTANGULAR
Package form	IN-LINE	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	240	240
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	COMMERCIAL	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)	TIN LEAD
Terminal form	PIN/PEG	J INVERTED
Terminal location	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	20
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK

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