DATA SHEET
MOS INTEGRATED CIRCUIT
µ
PD4991A
4-BIT PARALLEL I/O CALENDAR CLOCK
The
µ
PD4991A 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
µ
PD4991A consumes 30 % less power than the
µ
PD4991.
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 H→L output selectable as alarm coincidence output
• Upward compatible with
µ
PD4991
• Low power consumption: 2
µ
A typ. (V
DD
= 2.4 V)
ORDERING INFORMATION:
Part Number
Package
18-pin plastic DIP (300 mil)
20-pin plastic SOP (300 mil)
µ
PD4991ACX
µ
PD4991AGS
Document No. IC-3309 (1st edition)
(O.D. No. IC-7892A)
Date Published March 1997 P
Printed in Japan
©
1995
1993
µ
PD4991A
PIN CONFIGURATION (Top View)
CS
1
1
TP
1
2
TP
2
3
A
0
4
A
1
5
A
2
6
A
3
7
OE 8
V
SS
9
µ
PD4991ACX
18 V
DD
17 X
IN
16 X
OUT
15 CS
2
CS
1
1
TP
1
2
TP
2
3
A
0
4
NC 5
20 V
DD
19 X
IN
18 X
OUT
17 CS
2
16 D
3
15 NC
14 D
2
13 D
1
12 D
0
11 WE
µ
PD4991AGS
14 D
3
A
1
6
13 D
2
A
2
7
12 D
1
11 D
0
10 WE
A
3
8
OE 9
V
SS
10
2
OSC
TIMING PULSE GENERATOR
TIME COUNTER
15stage Binary Divider
BLOCK DIAGRAM
X
IN
SEC.
CLOCK STOP
CLOCK WAIT
MIN.
HOUR WEEK
DAY
MONTH
YEAR
1/2
15
X
OUT
Nch OPEN DRAIN
CS
1
COMPARATOR
MPX
TP
1
CS
2
WE
ALARM
D
3
D
2
D
0
DATA BUS
CONTROLLER
D
1
DATA BUS
OE
TP
2
MODE REGISTER
CONTROL REGISTER 1
A
3
A
0
ADDRESS BUS
CONTROLLER
A
1
ADDRESS
DECODER
A
2
CONTROL REGISTER 2
µ
PD4991A
3
µ
PD4991A
PIN FUNCTION
• WE ..................... Write control pin (input).
The contents of the data bus are written to an address specified by the address bus at the
rising edge of WE.
• OE ..................... Read control pin (input).
While OE = “L” level, the contents specified by the address bus are read to the data bus.
• A
3
to A
0
.............. Address bus pins (input).
These pins specify an internal address of the
µ
PD4991A.
• D
3
to D
0
............. Data bus pin (I/O).
These pins constitute a bidirectional bus.
• CS
1
, CS
2
........... Chip select pins (input).
When CS
1
= “L” and CS
2
= “H”, data can be transferred between the
µ
PD4991A and the CPU.
• TP
1
.................... Timing pulse pin (output) (N-ch open-drain).
Outputs an alarm coincidence signal.
• TP
2
.................... Timing pulse pin (output) (N-ch open-drain).
Outputs an interval timer signal.
• X
IN
...................... Crystal oscillation signal pin (input).
Inverter input for oscillation.
• X
OUT
................... Crystal oscillation signal pin (output).
Inverter output for oscillation.
• V
DD
..................... Positive power supply pin.
• V
SS
..................... GND pin.
4
µ
PD4991A
ABSOLUTE MAXIMUM RATINGS (V
SS
= 0 V)
PARAMETER
Supply Voltage
Input Voltage Range
Output Pin Breakdown Voltage
Low-Level Output Current
(N-ch open-drain)
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
PP
V
IN
V
OUT
I
OUT
T
opt
T
stg
RATINGS
–0.3 ~ 7.0
–0.3 ~ V
PP
+ 0.3
7.0
30
–40 ~ +85
–65 ~ +125
UNIT
V
V
V
mA
°C
°C
ELECTRICAL CHARACTERISTICS
(V
SS
= 0 V, f = 32.768 kHz, C
G
= C
D
= 20 pF, C
i
= 20 kΩ, T
a
= –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.
V
DD
V
IH
V
IL
I
DD
I
DD
I
DD
I
LIH
I
LIL
V
OH
V
OL1
V
OL2
I
LOH
2.4
0.4
0.4
1.0
2
2.0
0.7 V
DD
V
SS
5
TYP.
MAX.
5.5
V
DD
0.3 V
DD
14
10
6
+1.0
–1.0
UNIT
V
V
V
CONDITIONS
µ
A
µ
A
µ
A
µ
A
µ
A
V
V
V
V
DD
= 3.6 V, V
IN
= V
SS
, T
a
= –40 ~ +70
°C
V
DD
= 3.0 V, V
IN
= V
SS
, T
a
= –40 ~ +70
°C
V
DD
= 2.4 V, V
IN
= V
SS
, T
a
= –40 ~ +70
°C
V
DD
= 5.5 V, V
IN
= V
DD
V
DD
= 5.5 V, V
IN
= V
SS
I
OH
= –1.0 mA
I
OL
= 2.0 mA
I
OL
= 1.0 mA (Nch Open Drain)
TP
out
= V
DD
(Nch Open Drain)
µ
A
* If V
IN
pins are not V
SS
, Current Consumption increase in value.
AC CHARACTERISTICS
Write cycle (Unless otherwise specified, V
DD
= 5 V
±
10 %, T
a
= –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.
t
WC
t
CW
t
AW
t
AS
t
WP
t
WR
t
DW
t
DH
t
WHZ
150
120
120
0
90
20
50
0
50
ns
TYP.
MAX.
UNIT
CONDITIONS
5
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