DS1744WP-120 datasheet, PDF - EEWORLD Datasheet

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DS1744WP-120: Description0 TIMER(S), REAL TIME CLOCK, DMA34, POWERCAP, MODULE-34; CategoryThe embedded processor and controller Microcontrollers and processors; File Size2MB，23 Pages; ManufacturerRochester Electronics; Websitehttps://www.rocelec.com/

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DS1744WP-120 Overview

0 TIMER(S), REAL TIME CLOCK, DMA34, POWERCAP, MODULE-34

DS1744WP-120 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Rochester Electronics
Parts packaging code	DMA
package instruction	,
Contacts	34
Reach Compliance Code	unknown
Other features	A POWERCAP MODULE CONTAINING CRYSTAL AND BATTERY REQUIRED
maximum clock frequency	0.032 MHz
External data bus width	8
Information access methods	PARALLEL, DIRECT ADDRESS
JESD-30 code	R-XDMA-U34
JESD-609 code	e0
Humidity sensitivity level	NOT SPECIFIED
Number of terminals	34
Number of timers
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	UNSPECIFIED
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	240
Certification status	COMMERCIAL
Maximum supply voltage	3.63 V
Minimum supply voltage	2.97 V
Nominal supply voltage	3.3 V
surface mount	YES
Temperature level	COMMERCIAL
Terminal surface	TIN LEAD
Terminal form	J INVERTED
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK
Base Number Matches	1

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DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs

Figure 1. DS1744/DS1744P Block Diagram

DS1744/DS1744P

PACKAGES

The DS1744 is available in two packages (28-pin encapsulated DIP and 34-pin PowerCap module). The

28-pin EDIP 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 DS1744P 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 DS1744 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 (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 the DS1744 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 0. The

READ bit must be a 0 for a minimal of 500µs to ensure the external registers are updated.

4 of 20

DS1744WP-120 Related Products

	DS1744WP-120	DS1744P-70	DS1744W-120IND	DS1744-70
Description	0 TIMER(S), REAL TIME CLOCK, DMA34, POWERCAP, MODULE-34	0 TIMER(S), REAL TIME CLOCK, DMA28, EDIP MODULE-28	0 TIMER(S), REAL TIME CLOCK, DMA28, EDIP MODULE-28	0 TIMER(S), REAL TIME CLOCK, DMA28, EDIP MODULE-28
Is it lead-free?	Contains lead	Contains lead	Contains lead	Contains lead
Is it Rohs certified?	incompatible	incompatible	incompatible	incompatible
Maker	Rochester Electronics	Rochester Electronics	Rochester Electronics	Rochester Electronics
Parts packaging code	DMA	MODULE	MODULE	MODULE
Contacts	34	28	28	28
Reach Compliance Code	unknown	unknown	unknown	unknown
maximum clock frequency	0.032 MHz	0.032 MHz	0.032 MHz	0.032 MHz
External data bus width	8	8	8	8
Information access methods	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS	PARALLEL, DIRECT ADDRESS
JESD-30 code	R-XDMA-U34	R-XDMA-U28	R-XDMA-T28	R-XDMA-T28
JESD-609 code	e0	e0	e0	e0
Humidity sensitivity level	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
Number of terminals	34	28	28	28
Maximum operating temperature	70 °C	70 °C	85 °C	70 °C
Package body material	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY
Peak Reflow Temperature (Celsius)	240	240	240	240
Certification status	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Maximum supply voltage	3.63 V	5.5 V	3.63 V	5.5 V
Minimum supply voltage	2.97 V	4.5 V	2.97 V	4.5 V
Nominal supply voltage	3.3 V	5 V	3.3 V	5 V
surface mount	YES	YES	NO	NO
Temperature level	COMMERCIAL	COMMERCIAL	INDUSTRIAL	COMMERCIAL
Terminal surface	TIN LEAD	TIN LEAD	TIN LEAD	TIN LEAD
Terminal form	J INVERTED	J INVERTED	THROUGH-HOLE	THROUGH-HOLE
Terminal location	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
uPs/uCs/peripheral integrated circuit type	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK	TIMER, REAL TIME CLOCK

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