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MFG:NEC  Package Cooled:SMD  

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Part Number: UPD4991A

 

MFG: NEC

Package Cooled: SMD

 

Description: The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calen...


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UPD4991A General Description


The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendardata to/from a microcomputer and includes an alarm function.

  Its reference oscillation frequency is 32.768 kHz.  Hour, minute, second, year, month, day, and date data is storedinternally.
        The µPD4991A consumes 30 % less power than the µPD4991.

UPD4991A Maximum Ratings

PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VPP
0.3 ~ 7.0
V
Input Voltage Range
VIN
0.3 ~ VPP + 0.3
V
Output Pin Breakdown Voltage
VOUT
7.0
V
Low-Level Output Current(N-ch open-drain)
IOUT
30
mA
Operating Ambient Temperature
Topt
40 ~ +85
°C
Storage Temperature
Tstg
65 ~ +125
°C

UPD4991A Features

• Time (hour, minute, and second) and calendar (leap year, year, month, day, and date) counters
• Leap year can be automatically identified or set
• 12- and 24-hour modes selectable
• 4-bit parallel input/output in BCD data format
• Alarm function (hour, minute, second, month, day, date)
• One of 0.1, 1.0, 10, 30, and 60-s interval timer outputs selectable
• One of 2048, 1024, 64, 16, 1 Hz, 1-pulse output, and HL output selectable as alarm coincidence output
• Upward compatible with µPD4991
• Low power consumption:  2 µA typ. (VDD = 2.4 V)

UPD4991A Connection Diagram

UPD4991A  Connection Diagram

UPD4991A datasheet

UPD4991A
PDF/DataSheet Download

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