DS1394U-33+T&R by Analog Devices

Low-Voltage SPI/3-Wire RTCs with Trickle Charger

Status: Active
Series: DS1394
RoHS: Unknown
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The low-voltage serial-peripheral interface (SPI™) DS1390/DS1391/DS1394 and the low-voltage 3-wire DS1392/DS1393 real-time clocks (RTCs) are clocks/calendars that provide hundredths of a second, seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. One programmable time-of-day alarm is provided. A temperature-compensated voltage reference monitors the status of VCC and automatically disables the bus interface and switches to the backup supply if a power failure is detected. On the DS1390, a single open drain output provides a CPU interrupt or a square wave at one of four selectable frequencies. The DS1391 replaces the SQW/active-low INT pin with an active-low RST output/debounced input. The DS1390, DS1391, and DS1394 are programmed serially through an SPI-compatible, bidirectional bus. The DS1392 and DS1393 communicate over a 3-wire serial bus, and the extra pin is used for either a separate interrupt pin or an active-low RST output/debounced input. All five devices are available in a 10-pin µSOP package, and are rated over the industrial temperature range.

Prices starting from US$2.39


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Logo for Newark Electronics Newark Electronics US$3.33
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Features

Real-Time Clock Counts Hundredths of Seconds, Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
Output Pin Configurable as Interrupt or Square Wave with Programmable Frequency of 32.768kHz, 8.192kHz, 4.096kHz, or 1Hz (DS1390/DS1393/DS1394 Only)
One Time-of-Day Alarm
Power-Fail Detect and Switch Circuitry
Reset Output/Debounced Input (DS1391/DS1393)
Separate SQW and INT Output (DS1392)
Trickle-Charge Capability
SPI Supports Modes 0 and 2 (DS1394)
SPI Supports Modes 1 and 3 (DS1390/DS1391)
3-Wire Interface (DS1392/DS1393)
4MHz at 3.0V and 3.3V
1MHz at 1.8V
Three Operating Voltages: 1.8V ±5%, 3.0V ±10%, and 2.97 to 5.5V (DS1394: 3.3V ±10%)
Industrial Temperature Range: -40°C to +85°C

Specifications

Interface SPI
VSUPPLY (V) 5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS:hh
Time Keeping Current (nA) (typ) 500
CL (pF) 6
Memory Type None
Time of Day Alarms 1
Package/Pins UMAX/10
BudgetaryPrice (See Notes) 1.85


DS1394U-33+T&R Maxim Integrated Parts by Analog Devices

RTC D-D-M-Y HH:MM:SS:HH USOP-10

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

Specifications

Date Format Day
Clock Format HH
Clock IC Type Alarm RTC
Supply Voltage Min 2.97V
Supply Voltage Max 5.5V
Clock IC Case Style µSOP
No. of Pins 10Pins
IC Interface Type SPI
Operating Temperature Min -40°C
Operating Temperature Max 85°C
Automotive Qualification Standard -
MSL MSL 1 - Unlimited

Alternative Descriptions

RTC, D-D-M-Y, HH: MM: SS: HH, USOP-10 | Farnell
Rtc, D-D-M-Y, Hh:Mm:Ss:Hh, Usop-10 | Newark Electronics

Frequently Asked Questions

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This part has not been flagged as RoHS Compliant.

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Authorised distributors including Farnell and Newark Electronics have stock available or on a lead time for DS1394U-33+T&R .

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