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PDF UPD4991A Data sheet ( Hoja de datos )

Número de pieza UPD4991A
Descripción 4-BIT PARALLEL I/O CALENDAR CLOCK
Fabricantes NEC 
Logotipo NEC Logotipo



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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4991A
4-BIT PARALLEL I/O CALENDAR CLOCK
The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar
data 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 stored
internally.
The µPD4991A consumes 30 % less power than the µPD4991.
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)
ORDERING INFORMATION:
Part Number
µPD4991ACX
µPD4991AGS
18-pin plastic DIP (300 mil)
20-pin plastic SOP (300 mil)
Package
Document No. IC-3309 (1st edition)
(O.D. No. IC-7892A)
Date Published March 1997 P
Printed in Japan
© 19953

1 page




UPD4991A pdf
µPD4991A
ABSOLUTE MAXIMUM RATINGS (VSS = 0 V)
PARAMETER
SYMBOL
Supply Voltage
VPP
Input Voltage Range
VIN
Output Pin Breakdown Voltage
VOUT
Low-Level Output Current
(N-ch open-drain)
IOUT
Operating Ambient Temperature
Topt
Storage Temperature
Tstg
RATINGS
–0.3 ~ 7.0
–0.3 ~ VPP + 0.3
7.0
30
–40 ~ +85
–65 ~ +125
UNIT
V
V
V
mA
°C
°C
ELECTRICAL CHARACTERISTICS
(VSS = 0 V, f = 32.768 kHz, CG = CD = 20 pF, Ci = 20 k, Ta = –40 to +85 °C)
PARAMETER
Operating Voltage Range
High-level Input Voltage
Low-level Input Voltage
Current Consumption *
Current Consumption *
Current Consumption *
High-Level Input Leakage Current
Low-Level Input Leakage Current
High-Level Output Voltage
Low-Level Output Voltage
Low-Level Output Voltage
High-Level Leakage Current
SYMBOL MIN. TYP. MAX. UNIT
VDD 2.0
5.5 V
VIH 0.7 VDD
VDD V
VIL VSS
0.3 VDD V
IDD 5 14 µA
IDD 10 µA
IDD 2 6 µA
ILIH +1.0 µA
ILIL –1.0 µA
VOH 2.4
V
VOL1
0.4 V
VOL2
0.4 V
ILOH 1.0 µA
CONDITIONS
VDD = 3.6 V, VIN = VSS, Ta = –40 ~ +70 °C
VDD = 3.0 V, VIN = VSS, Ta = –40 ~ +70 °C
VDD = 2.4 V, VIN = VSS, Ta = –40 ~ +70 °C
VDD = 5.5 V, VIN = VDD
VDD = 5.5 V, VIN = VSS
IOH = –1.0 mA
IOL = 2.0 mA
IOL = 1.0 mA (Nch Open Drain)
TPout = VDD (Nch Open Drain)
* If VIN pins are not VSS, Current Consumption increase in value.
AC CHARACTERISTICS
Write cycle (Unless otherwise specified, VDD = 5 V ± 10 %, Ta = –40 to +85 °C)
PARAMETER
Cycle Time
CS-WE Reset Time
Address-WE Reset Time
Address-WE Setup Time
Write Pulse Width
Address Hold Time
Input Data Setup Time
Input Data Hold Time
WE-Output Floating Time
SYMBOL MIN.
tWC 150
tCW 120
tAW 120
tAS 0
tWP 90
tWR 20
tDW 50
tDH 0
tWHZ
TYP.
MAX. UNIT
ns
50
CONDITIONS
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UPD4991A arduino
µPD4991A
FUNCTION OUTLINE
• The µPD4991A has the following three modes:
1 BASIC TIME MODE
In this mode, data can be written and read between the timer counter and the CPU. Moreover, control
registers 1 and 2 can be specified by a command*.
2 ALARM SET & TP1 CONTROL MODE
In this mode, data is set to the alarm register, the function of TP1 is set, and control registers 1 and 2 are
specified by a command*.
3 ALARM SET & TP2 CONTROL MODE
In this mode, data is set to the alarm register, the function of TP2 is set, the 12- or 24-hour mode is selected,
leap year identification function is set, and control registers 1 and 2 are specified by a command*.
* Control registers 1 and 2 are commonly used in all the modes.
To select a mode, write mode data to ADDRESS = “FH.” Once a mode has been set, it is retained until a new
mode is set.
Table 1 shows the correspondence between modes and mode data.
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