DS1743 datasheet, PDF - EEWORLD Datasheet

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DS1743: DescriptionY2KC Nonvolatile Timekeeping RAM; File Size247KB，17 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1743 Overview

Y2KC Nonvolatile Timekeeping RAM

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DS1743/DS1743P

Y2KC Nonvolatile Timekeeping RAM

www.dalsemi.com

FEATURES

Integrated NV SRAM, real time clock, crystal, power-

fail control circuit and lithium energy source

Clock registers are accessed identical to the static

RAM. These registers are resident in the eight top

RAM locations.

Century byte register

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%

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 bytewide 8k 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

PIN ASSIGNMENT

A12

DQ0

DQ1

DQ2

GND

CE2

A11

A10

DQ7

DQ6

DQ5

DQ4

DQ3

28-Pin Encapsulated Package

(700-mil Extended)

RST

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

A12

A11

A10

GND V

BAT

ORDERING INFORMATION

DS1743P-XXX (5V)

-70

-100

blank

70 ns access

100 ns access

34-Pin Powercap Module Board

(Uses DS9034PCX Powercap)

PIN DESCRIPTION

A0-A12

28-pin DIP Module

34-pin PowerCap Module

board*

(3.3V)

-120

120 ns access

-150

150 ns access

CE2

*DS1743WP-XXX

28-pin DIP Module

34-pin PowerCap Module

board*

*DS9034PCX (PowerCap) Required:

blank

GND

DQ0-DQ7

RST

(must be ordered separately)

X1, X2

BAT

1 of 17

- Address Input

- Chip Enable

- Chip Enable 2 (DIP

Module only)

- Output Enable

- Write Enable

- Power Supply Input

- Ground

- Data Input/Output

- No Connection

- Power-On Reset Output

(PowerCap Module board only)

- Crystal Connection

- Battery Connection

022301

DS1743/DS1743P

DESCRIPTION

The DS1743 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) and 8k x 8

non-volatile static RAM. User access to all registers within the DS1743 is accomplished with a bytewide

interface as shown in Figure 1. The Real Time Clock (RTC) information and control bits reside in the

eight uppermost RAM locations. The RTC registers contain century, 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 DS1743 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 DS1743 is available in two packages (28-pin DIP 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

DS1743P 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 DS1743 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, bit 6 of the century register, see Table 2. As long

as a 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 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 DS1743 registers are updated simultaneously after the internal clock

The READ bit must be a zero for a minimum of 500

µs

to ensure the external registers will be updated.

2 of 17

DS1743 Related Products

	DS1743	DS1743-100	DS1743W-120	DS1743-70	DS1743W-150	DS1743P	DS1743P-70	DS1743WP-120	DS1743WP-150	DEMO-MGA-68XP8
Description	Y2KC Nonvolatile Timekeeping RAM	0 TIMER(S), REAL TIME CLOCK, DMA28	0 TIMER(S), REAL TIME CLOCK, DMA28	0 TIMER(S), REAL TIME CLOCK, DMA28	0 TIMER(S), REAL TIME CLOCK, DMA28	Y2KC Nonvolatile Timekeeping RAM	0 TIMER(S), REAL TIME CLOCK, DMA34	0 TIMER(S), REAL TIME CLOCK, DMA34	0 TIMER(S), REAL TIME CLOCK, DMA34	Low Noise And High Linearity Active Bias Low Noise Amplifi er
Maker	-	DALLAS	DALLAS	DALLAS	DALLAS	-	DALLAS	-	DALLAS	-
package instruction	-	PLASTIC, MODULE, DIP-28	PLASTIC, MODULE, DIP-28	PLASTIC, MODULE, DIP-28	PLASTIC, MODULE, DIP-28	-	0.700 INCH, MODULE, POWERCAP-34	0.700 INCH, MODULE, POWERCAP-34	0.700 INCH, MODULE, POWERCAP-34	-
Reach Compliance Code	-	unknown	unknow	unknow	unknow	-	unknow	unknow	unknow	-
maximum clock frequency	-	0.032 MHz	0.032 MHz	0.032 MHz	0.032 MHz	-	0.032 MHz	0.032 MHz	0.032 MHz	-
External data bus width	-	8	8	8	8	-	8	8	8	-
Information access methods	-	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	-	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	-
interrupt capability	-	N	N	N	N	-	N	N	N	-
JESD-30 code	-	R-XDMA-P28	R-XDMA-P28	R-XDMA-P28	R-XDMA-P28	-	R-XDMA-U34	R-XDMA-U34	R-XDMA-U34	-
Number of terminals	-	28	28	28	28	-	34	34	34	-
Maximum operating temperature	-	70 °C	70 °C	70 °C	70 °C	-	70 °C	70 °C	70 °C	-
Package body material	-	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	-	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	-
Encapsulate equivalent code	-	DIP28,.6	DIP28,.6	DIP28,.6	DIP28,.6	-	MODULE,34LEAD,1.0	MODULE,34LEAD,1.0	MODULE,34LEAD,1.0	-
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	-
Package form	-	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	-	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	-
power supply	-	5 V	3.3 V	5 V	3.3 V	-	5 V	3.3 V	3.3 V	-
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified	-	Not Qualified	Not Qualified	Not Qualified	-
Maximum supply voltage	-	5.5 V	3.63 V	5.5 V	3.63 V	-	5.5 V	3.63 V	3.63 V	-
Minimum supply voltage	-	4.5 V	2.97 V	4.5 V	2.97 V	-	4.5 V	2.97 V	2.97 V	-
Nominal supply voltage	-	5 V	3.3 V	5 V	3.3 V	-	5 V	3.3 V	3.3 V	-
surface mount	-	NO	NO	NO	NO	-	YES	YES	YES	-
technology	-	CMOS	CMOS	CMOS	CMOS	-	CMOS	CMOS	CMOS	-
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	-
Terminal form	-	PIN/PEG	PIN/PEG	PIN/PEG	PIN/PEG	-	J INVERTED	J INVERTED	J INVERTED	-
Terminal location	-	DUAL	DUAL	DUAL	DUAL	-	DUAL	DUAL	DUAL	-
shortest time	-	SECONDS	SECONDS	SECONDS	SECONDS	-	SECONDS	SECONDS	SECONDS	-
Volatile	-	NO	NO	NO	NO	-	NO	NO	NO	-
uPs/uCs/peripheral integrated circuit type	-	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	-	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	-

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