CDP1879 View Datasheet(PDF) - Intersil
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CDP1879 Datasheet PDF : 18 Pages
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CDP1879, CDP1879C-1
Static Electrical Specifications at TA -40oC to +85oC VDD ± 5%, Unless Otherwise Specified (Continued)
CONDITIONS
LIMITS
CDP1879
CDPl879C-1
PARAMETER
VO
VIN
VDD
(NOTE 1)
(NOTE 1)
(V)
(V)
(V)
MIN
TYP
MAX MIN
TYP MAX
Input Capacitance
CIN
-
Output Capacitance
COUT
-
Maximum Clock Rise
tR, tF
-
and Fall Times
-
-
-
-
-
-
-
-
5
-
-
10
-
5
7.5
-
10
15
-
-
10
-
-
1
-
5
7.5
10
15
-
10
-
-
NOTES:
1. Typical values are for TA = 25oC and nominal VDD.
2. IOL = IOH = 1µA.
3. Operating current measured with clockout = 488.2µs and no load.
4. See Table 3 and Figure 6 for oscillator circuit information.
UNITS
pF
µs
Programming Model
WRITE AND READ REGISTERS
WRITE ONLY REGISTERS
BCD FORMAT
DB7
TENS 0-5
SECONDS COUNTER (00-59)
DB7
TENS 0-5
MINUTES COUNTER (00-59)
UNITS 0-9
UNITS 0-9
DB7 DB6
X
X
TENS 0-2
UNITS 0-9
HOURS COUNTER (01 - 12 OR 00-23)
DB7 0=AM, 1=PM
DB6 0=24 HR, 1=12 HR
DB7
TENS 0-3
DAY OF MONTH COUNTER
(01-28, 29, 30, 31)
DB7
UNITS 0-9
X
TENS 0 OR 1
MONTH COUNTER
(JAN=1 DEC=12)
DB7 0=NO LEAP YEAR
1=LEAP YEAR
UNITS 0-9
DB0
DB0
DB0
DB0
DB0
DB7
7
6
5
4
3
2
1
CONTROL REGISTER
DB0-DB1 - FREQUENCY SELECT
DB2 - START/STOP
DB3 - COUNTER/ALARM LATCH CONTROL
DB4-DB7 - CLOCK OUTPUT SELECT
DB7
TENS 0-5
UNITS 0-9
SECONDS ALARM LATCH (00-59)
DB7
TENS 0-5
UNITS 0-9
MINUTES ALARM LATCH (00-59)
DB7 DB6
X
X
TENS 0-2
UNITS 0-9
HOURS ALARM LATCH (01-12 OR 00-23
12 HR, DB7=0 AM, 1=PM
24 HR, DB7=X
DB0
0
DB0
DB0
DB0
READ ONLY REGISTER
DB7 DB6
DB0
X
X
0
0
0
0
0
0
INTERRUPT STATUS REGISTER
DB7=1 ALARM CIRCUIT ACTIVATED INT.
DB6=1 CLOCK OUTPUT ACTIVATED INT.
4-108
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