DS1747W-120 datasheet, PDF - EEWORLD Datasheet

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DS1747W-120: DescriptionReal Time Clock; CategoryThe embedded processor and controller Microcontrollers and processors; File Size251KB，16 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS1747W-120 Overview

Real Time Clock

DS1747W-120 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Maxim
Parts packaging code	MODULE
package instruction	QIP, 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	N
JESD-30 code	R-XDMA-P32
JESD-609 code	e0
length	43.053 mm
Number of terminals	32
Number of timers
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	UNSPECIFIED
encapsulated code	QIP
Encapsulate equivalent code	DIP32,.6
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	240
power supply	3.3 V
Certification status	Not Qualified
Maximum seat height	10.922 mm
Maximum supply voltage	3.63 V
Minimum supply voltage	2.97 V
Nominal supply voltage	3.3 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
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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DS1747/DS1747P

Y2K-Compliant, Nonvolatile Timekeeping RAMs

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 are

Resident in the Eight Top RAM Locations

Century Byte Register (Y2K Compliant)

Totally Nonvolatile with Over 10 Years of

Operation in the Absence of Power

BCD-Coded Century, 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

Power-Supply Tolerance

Lithium Energy Source is Electrically

Disconnected to Retain Freshness Until

Power is Applied for the First Time

DIP Module Only:

Standard JEDEC Byte-Wide 512k x 8 Static

RAM Pinout

PowerCap Module Board Only:

Surface-Mountable Package for Direct

Connection to PowerCap Containing

Battery and Crystal

Replaceable Battery (PowerCap)

Power-On Reset Output

Pin-for-Pin Compatible with Other Densities

of DS174xP Timekeeping RAM

Also Available in Industrial Temperature

Range: -40°C to +85°C

PIN CONFIGURATIONS

TOP VIEW

A18

A16

A14

A12

DQ0

DQ1

DQ2

GND

Maxim

DS1747

A15

A17

A13

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3



Encapsulated DIP

(512k x 8)



N.C.

A15

A16

RST



DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

Maxim

DS1747P

GND

BAT

A18

A17

A14

A13

A12

A11

A10

PowerCap Module Board

(Uses DS9034PCX+ or DS9034I-PCX+ PowerCap)



1 of 16

19-5504; Rev 6/13

DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs

Figure 1. Block Diagram

Maxim

DS1747

PACKAGES

The DS1747 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 Power-Cap to be mounted on

top of the DS1747P 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.

TIME AND DATE OPERATIONS

The contents of the time and date registers are in BCD format. The day-of-week register increments at

midnight. Values that correspond to the day of week are user-defined, but must be sequential (i.e., if 1

equals Sunday, then 2 equals Monday and so on). Illogical time and date entries result in undefined

operation.

CLOCK OPERATIONS—READING THE CLOCK

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

updates to the DS1747 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, bit 6 of the century register (see

Table 2). As long as a one 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 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 the DS1747 registers are updated

simultaneously after the internal clock register updating process has been re-enabled. Updating is within

a second after the read bit is written to zero. The READ bit must be set to a zero for a minimum of

500µs to ensure the external registers will be updated.

4 of 16

DS1747W-120 Related Products

	DS1747W-120	DS1747P-70IND	DS1747P-70
Description	Real Time Clock	Real Time Clock	Real Time Clock
Is it Rohs certified?	incompatible	incompatible	-
Maker	Maxim	Maxim	-
Parts packaging code	MODULE	DMA	-
package instruction	QIP, 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	N	N	-
JESD-30 code	R-XDMA-P32	R-XDMA-U34	-
JESD-609 code	e0	e0	-
Number of terminals	32	34	-
Maximum operating temperature	70 °C	85 °C	-
Package body material	UNSPECIFIED	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	3.3 V	5 V	-
Certification status	Not Qualified	Not Qualified	-
Maximum supply voltage	3.63 V	5.5 V	-
Minimum supply voltage	2.97 V	4.5 V	-
Nominal supply voltage	3.3 V	5 V	-
surface mount	NO	YES	-
technology	CMOS	CMOS	-
Temperature level	COMMERCIAL	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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