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Numéro de référence | CDP6818A | ||
Description | CMOS Real-Time Clock | ||
Fabricant | GE | ||
Logo | |||
1 Page
__________________________ CMOS Peripherals
Advance Information
TERMINAL ASSIGNMENT
MOT
OSCI
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23 sew
OSC2
ADO
22 PS
21 CKour"
ADI
AD2
AD3
AD4
AD5
7
8
9
20 C KFS
19 TAo
18 'R"E"SE'T
17 os
16 STBY
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92C5-42690
24-Lead Dual-In-Llne Package
CDP6818A
CMOS Real-Time Clock Plus RAM
Features:
• Low-power, high-speed CMOS
• Internal time base and oscillator
• Counts seconds, minutes, and hours of the day
• Counts days of the week, date, month, and year
• 3 V to 6 V operation
• Time base input options: 4.194304 MHz, 1.048576 MHz, or 32.768 kHz
• Time base oscillator for parallel resonant crystals
• 40 to 200 pW typical operating power at low frequency time base
• 4.0 to 20 mW typical operating power at high frequency time base
The COP6818A Real-Time Clock plus RAM is a peripheral
device which includes the unique MOTEL concept for use
with various microprocessors, microcomputers, and larger
computers. This part combines three unique features: a
complete time-of-day clock with alarm and one hundred
year calendar, a programmable periodic interrupt and
square-wave generator, and 50 bytes of low-power static
RAM. The COP6818A uses high-speed CMOS technology
to interface with 1 MHz processor buses, while consuming
very little power.
The Real-Time Clock plus RAM has two distinct uses. First,
it is designed as a battery powered CMOS part (in an
otherwise NMOS/TTL system) including all the common
battery backed-up functions such as RAM, time, and
calendar. Secondly, the COP6818A may be used with a
CMOS microprocessor to relieve the software of the
timekeeping workload and to extend the available RAM of
an MPU such as the C0P6805E2.
T£RMINAL ASSIGNMENT
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4 3 2 1 28 27 26
PIN'~ADO
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AD2
25 CKOUT
24 CKFS
23 IRQ
AD3
22 RESET
AD4
TOPVIEW
21 OS
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92CS-42691
28-Lead Plastic Chip-Carrier Package
(Q Suffix)
• Binary or BCD representation of time, calendar, and
alarm
• 12- or 24-hour clock with AM and PM in 12-hour mode
• Daylight savings time option
• Automatic end of month recognition
• Automatic leap year compensation
• Microprocessor bus compatible
• Selectable between Motorola and competitor bus timing
• Multiplexed bus for pin efficiency
• Interfaced with software as 64 RAM locations
• 14 bytes of clock and control registers
• 50 bytes of general purpose RAM
• Status bit indicates data integrity
• Bus compatible interrupt Signals (IRQ)
• Three interrupts are separately software maskable and
testable
Time-of-day alarm, Once-per-second to
Once-per-day
Periodic rates from 30.5 ps to 500 ms
End-of-clock update cycle
• Programmable square-wave output signal
• Clock output may be used as microprocessor clock input
at time base frequency +1 or +4
lEI
The COP6818A is supplied in a 24-lead dual-in-line plastic
package (E suffix). in a 24-lead dual-in-line side-brazed
ceramic package (0 suffix) and in a 28-lead plastic chip
carrier package (Q suffix).
File Number 2041
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Pages | Pages 19 | ||
Télécharger | [ CDP6818A ] |
No | Description détaillée | Fabricant |
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