DS1643P-70+ datasheet, PDF - EEWORLD Datasheet

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DS1643P-70+: DescriptionNonvolatile Timekeeping RAM; CategoryThe embedded processor and controller Microcontrollers and processors; File Size216KB，17 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS1643P-70+ Overview

Nonvolatile Timekeeping RAM

DS1643P-70+ Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	Maxim
Parts packaging code	DMA
package instruction	ROHS COMPLIANT, POWERCAP, MODULE-34
Contacts	34
Reach Compliance Code	compli
ECCN code	EAR99
maximum clock frequency	0.032 MHz
External data bus width	8
Information access methods	PARALLEL, DIRECT ADDRESS
interrupt capability	N
JESD-30 code	R-XDMA-U34
JESD-609 code	e3
Humidity sensitivity level	1
Number of terminals	34
Number of timers
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	UNSPECIFIED
Encapsulate equivalent code	MODULE,34LEAD,1.0
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	260
power supply	5 V
Certification status	Not Qualified
Maximum supply voltage	5.5 V
Minimum supply voltage	4.5 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	J INVERTED
Terminal location	DUAL
shortest time	SECONDS
Maximum time at peak reflow temperature	NOT SPECIFIED
Volatile	NO
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK

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19-5058; Rev 5/10

DS1643/DS1643P

Nonvolatile Timekeeping RAMs

www.maxim-ic.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 Reside in the

Eight Top RAM Locations.



Totally Nonvolatile with Over 10 Years of

Operation in the Absence of Power



Access Times of 85ns and 100ns



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

Minutes, and Seconds with Leap Year

Compensation Valid Up to 2100



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



DS1643 Only (DIP Module)

Standard JEDEC Byte-Wide 8K x 8 RAM

Pinout



UL Recognized



DS1643P 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

N.C.

A12

DQ0

DQ1

DQ2

GND

DS1643

CE2

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3

Encapsulated DIP

(700-mil Extended)

N.C.

PFO

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

DS1643P

GND V

BAT

N.C.

A12

A11

A10

PowerCap Module Board

(Uses DS9034PCX PowerCap)

ORDERING INFORMATION

PART

DS1643-85+

DS1643-100+

DS1643P-85+

DS1643P-100+

VOLTAGE RANGE

(V)

5.0

TEMP RANGE

0°C to +70°C

PIN-PACKAGE

28 EDIP (0.740)

34-PowerCap*

TOP MARK

DS1643+85

DS1643+100

DS1643P+85

DS1643P+100

DS9034I-PCX+ and DS9034-PCX+ required (must be ordered separately).

+Denotes a lead(Pb)-free/RoHS-compliant package. The top mark will include a “+” symbol on lead-free devices.

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DS1643/DS1643P

DESCRIPTION

The DS1643 is an 8K x 8 nonvolatile static RAM with a full function Real Time Clock (RTC) that are

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

any JEDEC standard 8K x 8 SRAM. The device can also be easily substituted in ROM, EPROM and

EEPROM sockets 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

DS1643 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 DS1643 is available in two packages: 28-pin DIP module and 34-pin PowerCap module. The 28-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

DS1643P 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 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 DS1643 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 one is written into the read bit, the seventh most significant bit in the control

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

However, the internal clock registers of the double-buffered system continue to update so that the clock

accuracy is not affected by the access of data. All of the DS1643 registers are updated simultaneously

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

3 of 17

DS1643P-70+ Related Products

	DS1643P-70+	DS1643-100+	DS1643	DS1643P
Description	Nonvolatile Timekeeping RAM	Nonvolatile Timekeeping RAM	Nonvolatile Timekeeping RAM	Nonvolatile Timekeeping RAM

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