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)}}


Pinout




Specifications

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

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.