DS1746P-70+ by Analog Devices

Y2K-Compliant, Nonvolatile Timekeeping RAMs

Status: Active
Series: DS1746, DS1746P
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

The DS1746 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) and 128k x 8 nonvolatile static RAM. User access to all registers within the DS1746 is accomplished with a byte-wide interface as shown in Figure 1. The 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 binary-coded decimal (BCD) format. Corrections for the date of each 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 DS1746 also contains its own power-fail circuitry, which deselects the device when the VCC supply is in an out of tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.

Where to Buy

Prices starting from US$26.63

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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 are Resident in the Eight Top RAM Locations.
Century Byte Register (i.e., 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% VCC 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 128k 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
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

Specifications

Interface Bytewide
VSUPPLY (V) 5
Date/ Time Format (hh = sec/100) YYYY-MM-DD/ HH:MM:SS
Memory Type NV SRAM
Memory Size (Bytes) 128K
Time of Day Alarms 0
Package/Pins MOD/32PWRCP/34
BudgetaryPrice (See Notes) 24.49


DS1746P-70+ Semiconductors - ICs by Analog Devices

RTC W/ NV SRAM 128KB PWRCP-34

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Date Format Day
Clock Format HH
Clock IC Type RTC
Supply Voltage Min 4.5V
Supply Voltage Max 5.5V
Clock IC Case Style PWRCP
No. of Pins 34Pins
IC Interface Type Bytewide
Operating Temperature Min 0°C
Operating Temperature Max 70°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant To Be Advised
MSL MSL 3 - 168 hours
SVHC 1 2-dimethoxyethane ethylene glycol dimethyl ether (EGDME) (15-Jan-2018)

Alternative Descriptions

Y2K-Compliant, Nonvolatile Tim | Analog Devices
RTC W/ NV SRAM, 128KB, PWRCP-34 | Farnell
Rtc W/ Nv Sram, 128Kb, Pwrcp-34 | Newark Electronics
Real Time Clock Parallel 128KByte 34-Pin PowerCap Module | Avnet Asia

Frequently Asked Questions

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Is the DS1746P-70+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

Which authorised distributors for DS1746P-70+ have stock available?

Authorised distributors including Analog Devices, element14, Farnell, Newark Electronics and Avnet Asia have stock available or on a lead time for DS1746P-70+ .

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