RP5C15

Manufacturer Part NumberRP5C15
DescriptionReal time clock for microcomputers that can be connected directly to data buses of 16bit CPUs.
ManufacturerRICOH Co.,Ltd.
RP5C15 datasheet
 


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RP/RF/RJ5C15
OUTLINE
The RP/RF/RJ5C15 are real-time clocks for microcomputers that can be connected directly to data buses of
16bit CPUs, such as the 8086, Z8000, and 68000, and of 8bit CPUs, such as the 8085A, Z80, 6809, and 6502. They
allow setting or reading of the clock with the same procedures as for the Read/Write operation for memory.
These products have various features including clock, calendar and alarm functions and can be backed up by
batteries.
FEATURES
• Connected directly to CPU enabling fast access.
• 4bit address input : A0 - A3
• Built-in clock counter (hour, minute, second) and calendar counter (leap year, year, month, day, day-of-the-week)
• All clock data expressed in BCD codes
• Backed up by batteries (minimum : 2.0V)
• Selectable basic clock frequency : 16kHz, 1kHz, 128Hz, 16Hz, 1Hz, 1/60Hz.
• Outputs alarm signals or timing pulse of 16Hz or 1Hz.
• Supply voltage : Single power supply of +5V
• Packages RP5C15 ...... 18pin DIP
RF5C15 ...... 18pin SOP
RJ5C15 ...... 28pin PLCC
BLOCK DIAGRAM
OSCIN
15
OSC
1/2
OSCOUT
CS
CS
CLOCK
HOLD
RD
WR
ADJ
HOLD
CONTROLLER
REAL-TIME CLOCK
• 4bit bidirectional data bus : D0 - D3
• CMOS technology
16
H
, 1
H
, 128H
, 16H
, 1H
, 1/60H
k
z
k
z
z
z
z
z
S
S
S
S
S
S
S
2
3
4
5
6
7
8
4
3
4
2
3
4
2
T.RESET
ALARM REGISTER
RD.WR.
BANK 1
ALARM
ALARM
RESET
COMPARATOR
BANK 0. RD. WR.
RD. WR.
SECONDS MINUTES
HOURS
DAYS
MONTHS
YEARS
1
/
1
/
1
/
1
/
1
/
1
/
1
/
1
/
-
1
/
1
/
1
/
10
6
10
6
12
24
7
28
31
12
10
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC
S0
4
3 4
3
4
2
3
4
2
4
1
4
4
3
4
SO
ADDRESS
BUS
CLOCK
DECODER
SD
CONTROL
SELECT
SF
-SF
A
A
A
A
D
D
D
D
0
1
2
3
0
1
2
3
NO. EK-086-9908
1H
, 16H
z
z
ALARM
ALARM
OUTPUT
1
/
1
/
10
4
2
CLKOUT
CLOCK
OUTPUT
1

RP5C15 Summary of contents