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CDP1879,
CDP1879C-1
March 1997
CMOS Real-Time Clock
Features
• CPU Interface for Use with General-Purpose
Microprocessors
• Time Of Day/Calendar
• Reads Seconds, Minutes, Hours
• Reads Day of Month and Month
• Alarm Circuit With Seconds, Minutes or Hours
Operation
• Power Down Mode
• Separate Clock Output Selects 1 of 15 Square Wave
Signals
• Interrupt Output Activated By Clock Output and/or
Alarm Circuit
• Date Integrity Sampling for Clock Rollover Eliminated
• On-Board Oscillator:
- Crystal Operation CDP1879 at 10V . . . . . . . 4.19MHz,
2.09MHz or 1.048MHz
- Crystal Operation CDP1879C-1 at 5V . . . . . 4.19MHz,
2.09MHz or 1.048MHz or 32kHz
- External Clock Operation at 10V or 5V. . . . 4.19MHz,
2.09MHz, 1.048MHz or 32kHz
• Addressable in Memory Space or CDP1800 Series I/O
Mode
• Low Standby (Timekeeping) Voltage with External Clock
• Related Literature
- AN7275, Guide to the Use of CD1879 and
CDP1879C1 Real Time Clock
Pinout
CDP1879, CDP1879C-1 (PDIP, SBDIP)
TOP VIEW
INT 1
RESET 2
POWER DOWN 3
RD 4
IO/MEM 5
TPB/WR 6
TPA 7
CS 8
A2 9
A1 10
A0 11
VSS 12
24 VDD
23 XTAL
22 XTAL
21
CLK
OUT
20 DB7
19 DB6
18 DB5
17 DB4
16 DB3
15 DB2
14 DB1
13 DB0
Description
The CDP1879 real-time clock supplies time and calendar information
from seconds to months in BCD format. It consists of 5 separately
addressable and programmable counters that divide down an oscillator
input. The clock input can have any one of 4 possible frequencies,
allowing flexibility in the choice of crystal or external clock sources.
Using an external 32kHz clock source, timekeeping can be performed
down to 2.5V (see Standby (Timekeeping) Voltage Operation).
The device can be memory-mapped for use with any general-purpose
microprocessor and has the additional capability of operating in the
CDP1800 series input/output mode.
The real-time clock functions as a time-of-day/calendar with an alarm
capability that can be set for combinations of seconds, minutes or
hours. Alarm time is configured by loading alarm latches that activate
an interrupt output through a comparator when the counter and alarm
latch values are equal.
Fifteen selectable square-wave signals are available as a separate
clock output signal and can also activate the interrupt output. A status
register is available to indicate the interrupt source. The value in an 8 bit
control register determines the operational characteristics of the device,
by selecting the prescaler divisor and the clock output, and controls the
load and alarm functions.
A transparent “freeze” circuit preclude clock rollover during counter and
latch access times to assure stable and accurate values in the counters
and alarm latches.
The CDP1879 is functionally identical to the CDP1879C-1. The
CDP1879 has a recommended operating voltage range of 4V to 10.5V,
and the CDP1879C-1 has a recommended operating voltage range of
4V to 6.5V. The CDP1879 and the CDP1879C-1 are supplied in 24 lead
hermetic dual-in-line side-brazed ceramic packages (D suffix) and 24
lead dual-in-line plastic packages (E suffix).
Ordering Information
PACKAGE
PDIP
SBDIP
Burn-In
TEMP
RANGE
-40oC to
+85oC
-40oC to
+85oC
5V 10V
CDP1879CE1 CDP1879E
CDP1879CD1
CDP1879CD1X
-
-
PKG.
NO.
E24.6
D24.6
D24.6
CDP1879 Modes of Operation
OPERATION
FUNCTION
Read
1. Seconds, minutes, hours, date and month counters
2. Status register to identify interrupt source
Write
1. Control register to set device operation
2. Seconds, minutes, hours, date and month counters
3. Alarm latches for alarm time
Power Down
1. Three-state interrupt output with active alarm or
clock out circuitry for wake-up control
2. Data bus and address inputs are “DON’T CARE”
Interrupt
1. Clock out as source
2. Alarm time as source
3. Either interrupt can occur during normal or power
down mode
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
4-104
File Number 1360.2

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CDP1879, CDP1879C-1
Absolute Maximum Ratings
Thermal Information
DC Supply Voltage Range, VDD
(Voltage referenced to VSS Terminal)
CDP1879 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +11V
CDP1879C-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +7V
Input Voltage Range, All Inputs . . . . . . . . . . . . . . -0.5 to VDD +0.5V
DC Input Current, Any One Input . . . . . . . . . . . . . . . . . . . . . . ±10mA
Device Dissipation Per Output Transistor . . . . . . . . . . . . . . . . 40mW
For TA = Full Package Temperature Range
(All Package Types)
Thermal Resistance (Typical)
θJA (oC/W) θJC (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . .
60
N/A
SBDIP Package . . . . . . . . . . . . . . . . . .
50
12
Operating Temperature
Package Type D, H .
Range
......
(TA)
....
.
.
.
.
.
.
.
.
.
.
.
.-55oC
to
+125oC
Package Type E . . . . . . . . . . . . . . . . . . . . . . . . . . .-40oC to +85oC
Storage Temperature Range (TSTG). . . . . . . . . . . .-65oC to +150oC
Lead Temperature (During Soldering). . . . . . . . . . . . . . . . . . +265oC
At Distance 1/16 ±1/32 in. (1.59 ± 0.79mm) From Case for 10s Max
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Operating Conditions at TA = FuIl Package-Temperature Range, Unless Otherwise specified. For maximum reliability, operating con-
ditions should be selected so that operation Is always within the following ranges:
LIMITS
CDP1879
CDPl879C-1
PARAMETER
MIN
MAX
MIN
MAX
UNITS
DC Operating Voltage Range
4 10.5 4 6.5 V
Input Voltage Range
VSS
VDD
VSS
VDD
DC Standby (Timekeeping) Voltage (Note 1), VSTBY
TA = -40oC to +85oC (Note 2)
3-3-
TA = 0o to +70oC
2.5 - 2.5
Clock Input Rise or Fall Time, tR, tF
VDD = 5V
- 10 - 10
VDD = 10V
-1- -
NOTES:
1. Timekeeping function only, no READ/WRITE accesses, 32kHz external frequency source only, no crystal operation.
2. See Standby (Timekeeping) Voltage Operation.
V
V
V
µs
µs
4-105

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CDP1879, CDP1879C-1
FREEZE
CIRCUIT
AM - PM
AND
HOUR LOGIC
CALENDAR
LOGIC
XTAL
OSCILLATOR
XTAL
PRESCALE
SECOND
MINUTE
HOUR
DAY
MONTH
PRESCALE CLOCK
SELECT SELECT
CLOCK OUT
INT
RESET
VDD
VSS
CLOCK AND
INT. LOGIC
CONTROL
REGISTER
INT. STATUS
REGISTER
8-BIT DATA BUS
COMPARATOR
SECOND
LATCH
MINUTE
LATCH
HOUR
LATCH
I/O
INTERFACE
DB0-DB7
A0
A1
A2
TPA
I-O MEM
TPB/WR
RD
ADDRESS DECODE
AND
CONTROL LOGIC
CS
POWER DOWN
FIGURE 1. REAL-TIME CLOCK FUNCTIONAL DIAGRAM
TABLE 1.
CONTROL REGISTER BIT ASSIGNMENT
Bit 1, 0
Frequency 00
Select 01
10
11
32768Hz
1.048576MHz
2.097152MHz
4.194304MHz
Bit 2
Start/Stop
1 = Start
0 = Stop
Bit 3
Counter/Latch Control
“0” = Write to Counter and disable alarm
“1” = Write to and enable alarm Clock Select
Bit 7, 6, 5, 4
0000 - disableµs
0001 - 488.2µs
0010 - 976.5µs
0011 - 1953.1µs
0100 - 3906.2µs
0101 - 7812.5µs
0110 - 15.625ms
0111 - 31.25ms
1000 - 62.5ms
1001 - 125ms
1010 - 250ms
1011 - 500ms
1100 - sec.
1101 - min.
1110 - hour
1111 - day
TABLE 2.
ADDRESSES
A2 A1 A0
Latch, Counter Seconds
0
1
0
Latch, Counter Minutes
0
1
1
Latch, Counter Hours
1
0
0
Counter, Day
101
Counter, Month
110
Control, Register
111
Status Register
111
MSB of Hours Counters (Bit 7) is an AM-PM Bit. 0 = AM; 1 = PM
Bit 6 of Hours Counter Controls 12/24 hr. 1 = 12 Hr: 0 = 24 Hr.
Status Register: Bit 7 MSB = Alarm
Interrupt Source: Bit 6 = Clock.
MSB of Month Counter (Bit 7) is a Leap Year Bit 0 = No, 1 = Yes.
4-106

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CDP1879, CDP1879C-1
Static Electrical Specifications at TA -40oC to +85oC VDD ± 5%, Unless Otherwise Specified
CONDITIONS
LIMITS
CDP1879
CDPl879C-1
PARAMETER
VO VIN VDD
(NOTE 1)
(NOTE 1)
(V) (V) (V) MIN TYP MAX MIN TYP MAX
Ouiescent Device Current IDD
0, 5 5
- 0.01 50 - 0.02 200
0, 10
10
-
1 200 -
-
-
Output Low Drive (Sink)
0.4 0, 5 5 1.8
4
--
-
-
Current, Data Bus and INT lOL
0.5 0,10 10 3.6
7
--
-
-
Output High Drive (Source)
Current, Data Bus and INT IOH
4.6 0, 5
5 -1.1 -2.3
9.5 0,10 10 -2.6 -4.4
- -1.1 -2.3
--
-
-
-
Output Low Drive (Sink)
Current, Clock Out
lOL
0.4 0, 5 5 0.6
0.5 0,10 10 1.2
1.4
3
- 0.6 1.4
--
-
-
-
Output High Drive (Source)
Current, Clock Out
IOH
4.6 0, 5
5 -1.1 -2.3
9.5 0,10 10 -2.6 -4.4
- -1.1 -2.3
--
-
-
-
Output Low Drive (Sink)
Current, XTAL Out
lOL
0.4 0, 5 5 0.2
0.5 0,10 10 0.4
0.9
2
- 0.2 0.9
--
-
-
-
Output High Drive (Source)
Current, XTAL Out
IOH
4.6 0, 5
5
-0.15
-0.4
9.5 0,10 10 -0.3 -0.7
-
-0.15
-0.4
--
-
-
-
Output Voltage
Low-Level
(Note 2)
- 0, 5 5
-
0 0.1 -
0 0.1
VOL
- 0,10 10
-
0 0.1 -
-
-
Output Voltage
High Level
(Note 2)
VOH
- 0, 5 5 4.9
-
0, 10
10
9.9
5
10
- 4.9
--
5
-
-
-
Input Low Voltage
VIL
0.5, 4.5
-
5
-
0.5, 9.5
-
10
-
- 1.5 -
- 3-
- 1.5
--
Input High Voltage
VIH 0.5, 4.5 -
0.5, 9.5
-
5 3.5
10 7
-
-
- 3.5
--
-
-
-
-
Input Leakage Current
IIN
Any
Input
0, 5
0, 10
5
10
-
-
- ±1 -
- ±2 -
- ±1
--
Three-State Output
Leakage Current
IOUT
0, 5 0,5
0,10 0,10
5
10
-
-
- ±1 -
- ±1 -
- ±1
--
Operating Current (Note 3)
External Clock
32kHz
-
-
5
-
0.01 0.15
-
0.01 0.15
External Clock
1MHz
-
- 5 - 0.2 1 - 0.2 1
External Clock
2MHz
-
- 5 - 0.35 1.5 - 0.35 1.5
External Clock
4MHz
-
- 5 - 0.7 2 - 0.7 2
External Clock
32kHz
-
-
10
-
0.03 0.25
-
-
-
External Clock
1MHz
-
- 10 - 0.4 2 -
-
-
External Clock
2MHz
-
- 10 - 0.8 3 -
-
-
External Clock
4MHz
-
- 10 - 1.6 4.5 -
-
XTAL Oscillator (Note 4) 32kHz
-
- 5 - 0.1 0.25 - 0.1 0.25
XTAL Oscillator (Note 4) 1MHz
-
-
5 - 0.3 0.5 - 0.3 0.5
XTAL Oscillator (Note 4) 2MHz
-
- 5 - 0.4 0.6 - 0.4 0.6
XTAL Oscillator (Note 4) 4MHz
-
-
5 - 0.6 0.8 - 0.6 0.8
XTAL Oscillator (Note 4) 1MHz
-
- 10 - 1.6 3 -
-
-
XTAL Oscillator (Note 4) 2MHz
-
- 10 - 1.8 3.5 -
-
-
XTAL Oscillator (Note 4) 4MHz
-
- 10 -
2
5-
-
-
UNITS
µA
mA
V
µA
mA
4-107

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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
Output Capacitance
Maximum Clock Rise
and Fall Times
CIN
COUT
tR, tF
-
-
-
-
- --
- --
- 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
76 54 32 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
XX 00 00 00
INTERRUPT STATUS REGISTER
DB7=1 ALARM CIRCUIT ACTIVATED INT.
DB6=1 CLOCK OUTPUT ACTIVATED INT.
4-108