DS1554WP-120+ by Analog Devices

256k Nonvolatile, Y2K-Compliant Timekeeping RAM

Status: Active
Series: DS1554
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock
The DS1554 is a full-function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and 32k x 8 nonvolatile static RAM. User access to all registers within the DS1554 is accomplished with a byte-wide interface as shown in Figure 1. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format. Corrections for day of month and leap year are made automatically. The RTC registers are double-buffered into an internal and external set. The user has direct access to the external set. Clock/calendar updates to the external set of registers can be disabled and enabled to allow the user to access static data. Assuming the internal oscillator is turned on, the internal set of registers is continuously updated; this occurs regardless of external registers settings to guarantee that accurate RTC information is always maintained. The DS1554 has interrupt (active-low IRQ/FT) and reset (active-low RST) outputs which can be used to control CPU activity. The active-low IRQ/FT interrupt output can be used to generate an external interrupt when the RTC Register values match user programmed alarm values. The interrupt is always available while the device is powered from the system supply and can be programmed to occur when in the battery-backed state to serve as a system wakeup. Either the active-low IRQ/FT or active-low RST outputs can also be used as a CPU watchdog timer, CPU activity is monitored and an interrupt or reset output will be activated if the correct activity is not detected within programmed limits. The DS1554 power-on reset can be used to detect a system power down or failure and hold the CPU in a safe reset state until normal power returns and stabilizes; the active-low RST output is used for this function. The DS1554 also contains its own power-fail circuitry, which automatically deselects the device when the VCC supply enters an out of tolerance condition. This feature provides a high degree of data security during unpredictable system operation brought on by low VCC levels.

Where to Buy

Prices starting from US$5.55

Distributor Stock
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Newark Electronics
from US$5.55
10
in stock
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Logo for element14 Singapore
element14
from US$29.32
0
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Farnell
from US$30.85
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Features

Integrated NV SRAM, Real-Time Clock (RTC), Crystal, Power-Fail Control Circuit, Lithium Energy Source
Clock Registers are Accessed Identically to the Static RAM; These Registers Reside in the 16 Top RAM Locations
Century Byte Register (i.e., Y2K Compliant)
Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
Precision Power-On Reset
Programmable Watchdog Timer and RTC Alarm
BCD-Coded 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
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) 32K
Time of Day Alarms 1
Integrated Resonator XTAL
Package/Pins MOD/32PWRCP/34
BudgetaryPrice (See Notes) 17.83

Last 6 months Inventory & Pricing History

DS1554WP-120+ Semiconductors - ICs by Analog Devices

RTC BYTEWIDE 3.63V PWRCP-34

Semiconductors - ICs
> Clock,Timing & Frequency Management
> Real Time Clocks
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 2.97V
Supply Voltage Max 3.63V
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 -
MSL MSL 3 - 168 hours
SVHC 1 2-dimethoxyethane ethylene glycol dimethyl ether (EGDME) (15-Jan-2018)

Last 6 months Inventory & Pricing History

Alternative Descriptions

Rtc, Bytewide, 3.63V, Pwrcp-34 | Newark Electronics
RTC, BYTEWIDE, 3.63V, PWRCP-34 | element14

Frequently Asked Questions

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Is the DS1554WP-120+ RoHS compliant?

This part has not been flagged as RoHS Compliant.

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Authorised distributors including Newark Electronics, element14 and Farnell have stock available or on a lead time for DS1554WP-120+ .

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