CDP1879 Intersil Corporation, CDP1879 Datasheet - Page 5

• Manufacturer Part Number: CDP1879
• Description: CMOS Real-Time Clock
• Manufacturer: Intersil Corporation

Static Electrical Specifications
NOTES:
Programming Model
Input Capacitance
Output Capacitance
Maximum Clock Rise
and Fall Times
1. Typical values are for T
2. I
3. Operating current measured with clockout = 488.2 s and no load.
4. See Table 3 and Figure 6 for oscillator circuit information.
OL
BCD FORMAT
DB7
SECONDS COUNTER (00-59)
DB7
MINUTES COUNTER (00-59)
DB7
HOURS COUNTER (01 - 12 OR 00-23)
DB7 0=AM, 1=PM
DB6 0=24 HR, 1=12 HR
DB7
DAY OF MONTH COUNTER
(01-28, 29, 30, 31)
DB7
MONTH COUNTER
(JAN=1 DEC=12)
DB7 0=NO LEAP YEAR
= I
X
X
OH
1=LEAP YEAR
PARAMETER
= 1 A.
DB6
TENS 0-5
TENS 0-5
TENS 0-3
X
WRITE AND READ REGISTERS
TENS 0 OR 1
TENS 0-2
A
= 25
C
C
t
R
IN
OUT
, t
o
F
C and nominal V
at T
(V)
V
UNITS 0-9
UNITS 0-9
UNITS 0-9
UNITS 0-9
UNITS 0-9
-
-
-
-
O
A
CONDITIONS
-40
o
CDP1879, CDP1879C-1
DD
C to +85
V
(V)
IN
-
-
-
-
.
DB0
DB0
DB0
DB0
DB0
o
C V
V
(V)
10
DD
5
-
-
DD
4-108
5%, Unless Otherwise Specified (Continued)
MIN
-
-
-
-
DB7
INTERRUPT STATUS REGISTER
DB7=1 ALARM CIRCUIT ACTIVATED INT.
DB6=1 CLOCK OUTPUT ACTIVATED INT.
DB7
CONTROL REGISTER
DB0-DB1 - FREQUENCY SELECT
DB2 - START/STOP
DB3 - COUNTER/ALARM LATCH CONTROL
DB4-DB7 - CLOCK OUTPUT SELECT
DB7
SECONDS ALARM LATCH (00-59)
DB7
MINUTES ALARM LATCH (00-59)
DB7
HOURS ALARM LATCH (01-12 OR 00-23
12 HR, DB7=0 AM, 1=PM
24 HR, DB7=X
X
(NOTE 1)
CDP1879
7
X
TYP
10
5
-
-
DB6
DB6
X
TENS 0-5
TENS 0-5
6
X
WRITE ONLY REGISTERS
MAX
READ ONLY REGISTER
7.5
0
15
10
TENS 0-2
1
5
LIMITS
0
4
MIN
-
-
-
-
0
3
CDPl879C-1
(NOTE 1)
TYP
10
0
5
UNITS 0-9
UNITS 0-9
UNITS 0-9
-
-
2
0
1
MAX
7.5
15
10
-
0
DB0
0
DB0
DB0
DB0
DB0
UNITS
pF
s