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REAL-TIME CLOCK
RP/RF/RJ5C15
OUTLINE
NO. EK-086-9908
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 * All clock data expressed in BCD codes * Backed up by batteries (minimum : 2.0V)
* 4bit bidirectional data bus : D0 - D3
* Built-in clock counter (hour, minute, second) and calendar counter (leap year, year, month, day, day-of-the-week)
* 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 * CMOS technology
C O
OSC 1/215 T.RESET
BLOCK DIAGRAM
OSCIN OSCOUT
16kHz, 1kHz, 128Hz, 16Hz, 1Hz, 1/60Hz
S2 S3 S4 S5 S6 S7 S8
N
1Hz, 16Hz 4 3 4 2 3 4 2 ALARM REGISTER ALARM COMPARATOR ALARM BANK 0. RD. WR.
LEAP YEARS WEEK
RD.WR. BANK 1 ALARM RESET
TI
HOURS DAYS
1
N
MONTHS
1
IS
CS CS
RD. WR. CLOCK HOLD
SECONDS MINUTES
1
YEARS
1
RD
/10 1/6 1/10 1/6 1/12 1/24 1/7
/28-1/31
/12
/10 1/10 1/4
WR
D
ADJ HOLD
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC 4 S0 3 4 3 4 2 3 4 2 4 1 4 4 2 3 4
CONTROLLER SD -SF
SO SF
ADDRESS DECODER
BUS CONTROL
CLOCK SELECT
A0 A1 A2 A3
D0 D1 D2 D3
U ED
ALARM OUTPUT
CLKOUT CLOCK OUTPUT
1
RP/RF/RJ5C15
PIN CONFIGURATIONS
* RP5C15 (18pin DIP) * RF5C15 (18pin SOP) * RJ5C15 (28pin PLCC) NC CLKOUT CS CS Vcc OSCOUT OSCIN
CS CS CLKOUT A0 A1 A2 A3 RD GND
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
VCC OSCOUT OSCIN ALARM D3 D2 D1 D0 WR CS CS CLKOUT A0 A1 A2 A3 RD GND 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10
VCC
Pin No.
Symbol
The CS and CS are used to interface with external devices. Enabled when CS ="H" and 1,2 CS, CS CS="L". The CS is connected to the power down detector in the system power supply
3 4,5,6,7 8 9 10 11,12,13,14 15 16 17
CLKOUT A0 to A3 RD
Output pin for reference clock pulse and an open drain output. Selectable from 8 modes based on the setting of the clock select register as shown in the separate table. Input pins for the address signal. These pins are connected to the CPU address bus. Input pin for I/O control. The RD is set to "L" when data is transferred from the RP/RF/RJ5C15 to the CPU. Ground pin for the power supply of 0V. Input pin for I/O control. The WR is set to "L" when data is transferred from the CPU to
GND WR
IS
D0 to D3 ALARM OSCIN
D
OSCOUT VCC
18
*) Pin numbers shown are for the RP5C15 and the RF5C15.
These are different for the RJ5C15. For specific pin number see the "PIN CONFIGURATIONS".
2
C O
the RP/RF/RJ5C15. Bidirectional data bus. Connected to the data bus of the CPU.
The ALARM outputs alarm signal and 16Hz and 1Hz clock pulses. This pin is an open drain output. The OSCIN and OSCOUT are connected to the 32.768kHz crystal oscillator. 32.768kHz Input pin for the power supply of +5V.
N
assembly while the CS is connected to the microcomputer.
TI
PIN DESCRIPTION
N
Function
WR
A3 RD GND WR NC D0 D1
4 3 2 1 28 27 26 OSCOUT NC 5 25 OSCIN A0 6 24 7 23 ALARM NC A1 8 22 D3 NC 9 21 A2 10 20 D2 NC 11 19 D1 12 13 14 15 16 17 18 D0
U ED
NC ALARM NC D3 NC D2 NC
RP/RF/RJ5C15
ABSOLUTE MAXIMUM RATINGS
Symbol Item Conditions Ratings Unit
VCC VI VO Pd Topr Tstg
Supply Voltage Input Voltage Output Voltage Maximum Power Dissipation Operating Temperature Storage Temperature Ta=25C Referenced at GND pin
-0.3 to 7.0
V V V mW C C
ABSOLUTE MAXIMUM RATINGS
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation below these limits.
RECOMMENDED OPERATING CONDITIONS
Symbol Item
TI
Conditions
N
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under
N
U ED
-0.3 to VCC+0.3 -0.3 to VCC+0.3 400 -20 to 70 -40 to 125
MIN. TYP. MAX.
(Unless otherwise specified, Ta=-20 to 70C)
Unit
VCC VDH
Supply Voltage Data Preservation Voltage
4.5 2.0
5
5.5 5.5
V V kHz
fXT
Crystal Oscillation Frequency
C O
32.768
D
IS
3
RP/RF/RJ5C15
DC ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Ta=-20 to 70C, Vcc=5V10%)
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
"H" Input Voltage (excluding OSCIN) VIH "H" Input Voltage (OSCIN) "L" Input Voltage (excluding OSCIN) VIL "L" Input Voltage (OSCIN) VOH VOL ILI IOZ ICC1 ICC2 VILCS VIHCS "H" Output Voltage "L" Output Voltage Input Leakage Current Output Off-state Leakage Current Supply Current for Backup Operating Supply Current CS pin "L" Input Voltage for Backup CS pin "H" Input Voltage for Backup IOH=-400A IOL=2mA VIN=0 to Vcc Voz=0 to 5.5V
2.0 2.4
Vcc+0.3 Vcc+0.3 0.8 0.5
V V V V V V A A A A V V
fXT=32.768kHz, Vcc=2.0V
N
fXT=32.768kHz, Vcc=5.5V*
TI
Vcc=2.0V
Conditions
Vcc=2.0V
*)
RD, WR signal frequency : 100kHz ; Input pin is fixed at Vcc or GND level ; output pin open.
AC ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, Ta=-20 to 70C, Vcc=5V10%)
Symbol
C O
Item
N
U ED
-0.3 -0.3 2.4 0.4 10 -10 10 15 250 -0.2 1.8 0.2 2.0
MIN. TYP. MAX.
Unit
tAC tcc tCA tRD
Address-RD/WR Delay Time RD/WR Pulse Width
50 120 10 1TTL+100pF 10 100 20 100 100 100 1 120 13000
ns ns ns ns ns ns ns s s s s
Address Effective Time after rising of RD/WR
tRDH
tWDS
4
D
tTED tADJ tAINH tRCV
tWDH
IS
Data Delay Time after falling of RD Data Hold Time after rising of RD
Data Setup Time in Write operation Data Hold Time in Write operation Timer Enable to Timer Disable Adjust Completion Time Alarm Write Inhibit Time after Resetting RD/WR Recovery Time
RP/RF/RJ5C15
TIMING CHART
* Read Cycle CS, A0 to A3 Valid
tAC
tCC
tCA
RD
tRD
tRDH
Valid
D0 to D3
CS, A0 to A3
Valid
WR
TI
tWDS tWDH
Valid
tAC
tCC
N
tCA tRCV
5
* Write Cycle
D0 to D3
D
IS
C O
N
U ED
tRCV
RP/RF/RJ5C15
ADDRESS MAPPING
MODE A3 to A0 Description BANK 0 D3 D2 D1 D0 Description BANK 1 D3 D2 D1 D0
0 1 2 3 4 5 6 7 8 9 A B C D E F
1-second counter 10-second counter 1-minute counter 10-minute counter 1-hour counter 10-hour counter Day-of-the-week counter 1-day counter 10-day counter 1-month counter 10-month counter 1-year counter 10-year counter MODE register TEST register Timer EN Alarm EN Test 3 Test 2
x x x x x x x x x x
Adjust
U ED
x x x x x x x x x x x x x x x x x x x
Test 1
Clock output select register
x
ADJ
1-minute alarm register
10-minute alarm register 1-hour alarm register
10-hour alarm register
Day-of-the-week alarm register
N TI
BANK1/0 Test 0 "Z" 16.384kHz 1.024kHz 128Hz 16Hz 1Hz 1/60Hz "L"
1-day alarm register 10-day alarm register
x x
x
12/24 select register Leap year counter
x
BANK1/0 Test 0
N
x
Test 1
Timer EN Alarm EN Test 3 Test 2
*)
"x" means "Don't care" for Write ; always "0" for Read.
* Clock Output Select Register (BANK 1, Address 0h) D3 D2 D1 D0 Clock Output Remarks
x x x x x x x
IS
x
0 0 0 0 1 1 1 1
C O
0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1
RESET controller, etc. 1Hz ON 16Hz ON Timer RESET Alarm RESET
1Hz ON 16Hz ON Timer RESET Alarm RESET
High impedance duty 50% duty 50% duty 50% duty 50% duty 50% duty 50% When the second counter counts up. When the second counter counts up.
6
D
*)
"x" means "Don't care" for Write ; always "0" for Read.
RP/RF/RJ5C15
* ADJ (BANK1, Address 1h, D0) Bit for correcting the second digit. When set to 1, 1) For digits ranging from 00 to 29 : Resets the lower-order counter than the 1-second counter and sets the second digit to 00. digit to 00 and increments the minute digit by 1. * MODE register (BANK1/0, Address Dh) D3 D2 D1 D0 BANK1/0 Timer EN Alarm EN 2) For digits ranging from 30 to 59 : Resets the lower-order counter than the 1-second counter, sets the second
x
1: BANK1 : Setting and reading of alarm, 12-hour/24-hour, leap year, clock output selection and adjust operation. 0: BANK0 : Setting and reading of time 1: Alarm output enable 0: Alarm output disable (Note that 16Hz or 1Hz signals are not affected.) 1: Counting time starts ; 0 : the 1-second counter and
*) When the Timer EN is set to 0, the 1-second counter and higher-order counters than the 1-second counter stop.
If any carrying occurs in the lowerorder counters than the 1-second counter while the Timer EN is 0, carrying will be held and avoided until the Timer EN changes from 0 to 1. Thus, no apparent delay is produced when the duration of the Timer EN = 0 is less than one second.
* 12/24 select register (BANK1, Address Ah)
D0=1 sets to 24-hour system ; D0=0 sets to 12-hour system.
* Leap year counter (BANK1, Address Bh) (D1, D0)=(0, 0) sets the counter for leap years. The counter value changes in the order of (0, 0) (0, 1) (1, 0) (1, 1) (0, 0) repeatedly in the same timing as the year counter. * RESET controller/16Hz * 1Hz clock register. (BANK1/0, Address Fh) D0=1 : Resets all alarm registers. D1=1 : Resets divider stages for seconds or smaller units. D2=0 : 16Hz clock pulse ON. D3=0 : 1Hz clock pulse ON.
D
* Test register (BANK1/0, Address Eh) Register used for LSI inspection. Recommended setting is (D3, D2, D1, D0)=(0, 0, 0, 0)
Addresses 0h to Dh are applicable both for Read and Write. Addresses Eh to Fh are applicable only for Write.
*) *)
IS
C O
Set the 10-hour counter as D1=1 for p.m., D1=0 for a.m.
N
TI
higher-order counters than the 1-second counter stop*
N
U ED
7
RP/RF/RJ5C15
OSCILLATOR CIRCUIT
. Since this circuit includes an output ballast resistor (=70k), no external device is necessary. .
70k RP/RF/RJ5C15 OSCIN CI 16 17
OSCOUT Co
32.768kHz
8
D
IS
C O
N
TI
N
*) *)
Values of CI and CO are for reference only. In the RJ5C15, the OSCIN is 26pin and the OSCOUT is 27pin.
U ED
CI=Variable between 10 and 30pF. CO=Standard 30pF
RP/RF/RJ5C15
PACKAGE DIMENSIONS
* RP5C15 (18pin DIP)
24.8max. 0.976max. 18 10 6.40.2 0.2520.008
1 4.7max. 0.185max. 1.5typ. 0.059typ.
9
0.51min. 0.020min.
N
0
2.54 0.100
0.46 +0.15 -0.1
0.018 +0.006 -0.004
TI
0.25(0.010) M
2.8min. 0.110min.
18
11.71max. 0.461max.
C O
N
* RF5C15 (18pin SOP)
10
IS
2.340.1 0.0920.004
2.64max. 0.104max.
1
9
0.25 +0.1 -0.05
0.775max. 0.031max.
0.010 +0.004 -0.002
D
0.22typ. 0.009typ.
1.27 0.050 0.410.1 0.0160.004
0.12(0.005)
0.12(0.005) M
U ED
7.62 0.300
to
15
5 +0.1 5 0 0.25 -0. 06 +0.0 0 .002 0.01 -0
(Unit : inch )
mm
10.310.3 0.4060.012 7.520.2 0.2960.008
0 t
0 o1
0.810.2 0.0320.008
(Unit : inch )
mm
9
RP/RF/RJ5C15
* RJ5C15 (24pin PLCC)
Pin No.1 0.432 0.10 0.017 0.004
0.18(0.007) M
11.48typ. 0.452typ. 0.490 0.005 12.45 +0.12 -0.13
0.254 0.010
0.508min. 0.020min.
N
2.56 +0.23 -0.02
0.10(0.004)
1.27 0.050 10.67 +0.25 -0.76 0.420 +0.01 -0.03
C O
0.101 +0.009 -0.001
4.57max. 0.180max.
TI
(Unit : inch )
mm
0.737 0.076 0.029 0.003
10
D
IS
N
U ED
10.67 +0.25 -0.76 0.420 +0.01 -0.03
0.490 0.005
12.45 +0.12 -0.13
11.48typ. 0.452typ.
NOTICE
1. The products and the product specifications described in this document are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. This document may not be copied or otherwise reproduced in whole or in part without prior written consent of Ricoh. 3. Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise taking out of your country the products or the technical information described herein. 4. The technical information described in this document shows typical characteristics of and example application circuits for the products. The release of such information is not to be construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual property rights or any other rights. 5. The products listed in this document are intended and designed for use as general electronic components in standard applications (office equipment, computer equipment, measuring instruments, consumer electronic products, amusement equipment etc.). Those customers intending to use a product in an application requiring extreme quality and reliability, for example, in a highly specific application where the failure or misoperation of the product could result in human injury or death (aircraft, spacevehicle, nuclear reactor control system, traffic control system, automotive and transportation equipment, combustion equipment, safety devices, life support system etc.) should first contact us. 6. We are making our continuous effort to improve the quality and reliability of our products, but semiconductor products are likely to fail with certain probability. In order prevent any injury to persons or damages to property resulting from such failure, customers should be careful enough to incorporate safety measures in their design, such as redundancy feature, fire-containment feature and fail-safe feature. We do not assume any liability or responsibility for any loss or damage arising from misuse or inappropriate use of the products. 7. Anti-radiation design is not implemented in the products described in this document. 8. Please contact Ricoh sales representatives should you have any questions or comments concerning the products or the technical information.
June 1995
RICOH COMPANY, LTD. ELECTRONIC DEVICES DIVISION
HEADQUARTERS 13-1, Himemuro-cho, Ikeda City, Osaka 563-8501, JAPAN Phone +81-727-53-6003 Fax +81-727-53-2120 YOKOHAMA OFFICE (International Sales) 3-2-3, Shin-Yokohama, Kohoku-ku, Yokohama City, Kanagawa 222-8530, JAPAN Phone +81-45-477-1697 Fax +81-45-477-1694 * 1695 http://www.ricoh.co.jp/LSI/english/
RICOH CORPORATION ELECTRONIC DEVICES DIVISION
SAN JOSE OFFICE 1996 Lundy Avenue, San Jose, CA 95131, U.S.A. Phone +1-408-944-3306 Fax +1-408-432-8375 http://www.ricoh-usa.com/semicond.htm

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