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REAL-TIME CLOCK WITH INTERNAL RAM
RP/RF5C01A
NO. EK-086-9804
OUTLINE
The RP/RF5C01A are real-time clocks for microcomputers that can be connected directly to buses of microcomputers with such CPUs as the 8085A or Z80 and allow setting or reading of the clock with the same procedures as for the Read/Write operation for memory. These products have various features such as clock and calendar counters, alarm functions, and 26 4bits RAM which can be backed up by batteries. They can then be used as non-volatile RAM.
FEATURES
* Connected directly to CPU * 4bit bidirectional data bus : D0 - D3 * 4bit address input : A0 - A3 * Built-in clock counter (hour, minute, second) and calendar counter (leap year, year, month, day, day-of-the-week) * Supports both 12-hour AM/PM clock and 24-hour clock * All clock data expressed in BCD codes * Backed up by batteries (minimum:2.2V) * 30 second adjustment function * Built-in 26 4bits RAM
* Outputs alarm signals or timing pulse of 16Hz or 1Hz. * Packages : 18pin DIP (RP5C01A) ; 18pin SOP(RF5C01A)
BLOCK DIAGRAM
1Hz,16Hz, OSCIN OSCOUT
S2 S3 S4 S5 S6 S7 S8
OSC
1/215 T-RESET
4 RD.WR. MODE01 A-RESET
3
4
2
3
4
2
ALARM REGISTER
ADJ CS CS RD WR ADJ HOLD CLOCK HOLD
RD. WR. MODE 00
COMPARATOR
ALARM
ALARM ALARM OUTPUT
SECONDS MINUTES
1
HOURS
DAYS
1
MONTHS
1
YEARS
1
/10 1/6 1/10 1/6 1/12 1/24 1/7 S0 3
/28-1/31
/12
/10 1/10 1/4 RD.WR. MODE10,MODE11 SO-SC 264bits RAM
4
S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC 434234241442 4
4 CONTROLLER SD -SF
SO SF
ADDRESS DECODER
BUS CONTROL
INTERNAL BUS BUFFER
A0 A1 A2 A3
D0 D1 D2 D3
LEAP YEARS
WEEK
1
RP/RF5C01A
PIN CONFIGURATIONS
* RP5C01A CS CS ADJ 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 ADJ 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 * RF5C01A
PIN DESCRIPTION
Pin No. Symbol Function
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 while the CS is connected to the microcomputer. The ADJ can easily correct seconds without using the CPU. When this pin is set to "H" the 3 ADJ second digits ranging from 00 to 29 are set to 0, the second digits ranging from 30 to 59 are set to 0 and minute digits are incremented by 1. 4,5,6,7 8 9 10 11,12,13,14 15 16,17 18 A0 to A3 RD GND WR D0 to D3 ALARM OSCIN,OSCOUT VCC Input pin 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/RF5C01A 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 the RP/RF5C01A. Bidirectional data bus. Connected to the data bus of the CPU. The ALARM pin outputs alarm signals and 16Hz and 1Hz clock pulses. This pin is an open drain output. The OSCIN and OSCOUT are connected to the crystal oscillator of 32.768kHz Input pin for the power supply of +5V.
2
RP/RF5C01A
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 ABSOLUTE MAXIMUM RATINGS Ta=25C Referenced at GND pin
-0.3 to 7.0 -0.3 to VCC+0.3 -0.3 to VCC+0.3 700 0 to 70 -40 to 125
V V V mW C C
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under 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 Conditions
(Unless otherwise specified, Ta=0 to 70C)
MIN.
TYP.
MAX.
Unit
VCC VDH
Supply Voltage Data Preservation Voltage Crystal Oscillation Frequency
4.75 2.2
5
5.25 5.25
V V kHz
fXT
32.768
DC ELECTRICAL CHARACTERISTICS
Symbol Item Conditions
(Unless otherwise specified, Ta=0 to 70C, Vcc=5V10%)
MIN.
TYP.
MAX.
Unit
"H" Input Voltage (excluding OSCIN) VIH "H" Input Voltage (OSCIN) "L" Input Voltage (excluding OSCIN) VIL VOH VOL II IOZ ICC1 ICC2 "L" Input Voltage (OSCIN) "H" Output Voltage "L" Output Voltage Input Voltage Output Off-state Leakage Current Supply Current for backup Operating Supply Current IOH=-400A IOL=2mA VI=0 to 5.25V
2.0 4.0 -0.3 -0.3 2.4
Vcc Vcc 0.8 0.5
V V V V V
0.4 10 10
V A A A A
fXT=32.768kHz, Vcc=2.2V fXT=32.768kHz, Vcc=5.0V*2
15 250
*1) *2)
Plus (without sign) direction of current is assumed to be the direction flowing into IC. When connected to CPU (Read/Write cycle 10s)
3
RP/RF5C01A
AC ELECTRICAL CHARACTERISTICS (Vcc=5V5%)
Symbol Item Conditions MIN. TYP.
(Ta=0 to 70C)
MAX.
Unit
tAC tcc tCA tRD tRDH tWDL tWD
Address-RD/WR Delay Time RD/WR Pulse Width Address Effective Time after rising of RD/WR Data Delay Time after falling of RD Data Hold Time after rising of RD Data Delay Time after falling of WR Data Hold Time after rising of WR
170 400 10 340 0 40 20 10000
ns ns ns ns ns ns ns
AC ELECTRICAL CHARACTERISTICS (Vcc=5V10%)
(Ta=0 to 70C)
Symbol
Item
Conditions
MIN.
TYP.
MAX.
Unit
tAC tcc tCA tRD tRDH tWDL tWD
Address-RD/WR Delay Time RD/WR Pulse Width Address Effective Time after rising of RD/WR Data Delay Time after falling of RD Data Hold Time after rising of RD Data Delay Time after falling of WR Data Hold Time after rising of WR
170 450 10 400 0 40 20 10000
ns ns ns ns ns ns ns
TIMING CHART
* Write Cycle (CS="H")
CS *
tCA
A0 to A3
tWD
D0 to D3
tAC
WR *
tWDL tCC
*)
The RP/RF5C01A accept WR signals only when CS="L" and CS="H". Although CS timing is not specified for the RP/RF5C01A, substitute WR signals shown above with CS * WR signals to be applicable to the RP/RF5C01A configuration.
4
RP/RF5C01A
* Read Cycle (CS="H")
CS *
tCA
A0 to A3
tRDH
D0 to D3
tAC
RD *
tRD
tCC
*)
The RP/RF5C01A accept RD signals only when CS="L" and CS="H" as in the case of WR signals. Thus, substitute RD signals shown above, as in the case of WR signals, with CS * RD signals to be applicable to the RP/RF5C01A configuration.
ADDRESS MAPPING
MODE A3 to A0 Description MODE 00 D3 D2 D1 D0 Description MODE 01 D3 D2 D1 D0 10 11 Descrip- Description tion
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 RESET controller, etc.
Timer EN Alarm EN MODE register M1 M0

1-minute alarm register

Timer EN

10-minute alarm register 1-hour alarm register 10-hour alarm register
Day-of-the-week alarm register
RAM RAM 4bits13 4bits13 BLOCK BLOCK 10 11
1-day alarm register 10-day alarm register

Alarm EN

12/24 select register Leap year counter
ditto ditto ditto ditto
MODE register M1 M0
Test 3 Test 2 Test 1 Test 0
1Hz ON 16Hz ON Timer RESET Timer RESET
Test 3 Test 2 Test 1 Test 0
1Hz ON 16Hz ON Timer RESET Alarm RESET
*)
"x" means "Don't care" for Write; always "0" for Read.
5
RP/RF5C01A
* MODE register (Address Dh) D3 D2 D1 M1 0 0 1 1 D0 M0 0 1 0 1 MODE00 : Setting and read out of time MODE01 : Setting and read out of alarm, 12-hour/24-hour and leap year Read and Write of RAM of BLOCK10 Read and Write of RAM of BLOCK11 1 : Alarm output enabled 0 : Alarm output disabled (Note that 16Hz or 1Hz signals are not affected.) 1 : Counting time starts; 0 : the 1-second counter and higher-order than the 1-second counter stop Timer EN Alarm EN
*) 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 lower-order counters than the 1 second counter while the Timer EN is 0, carrying will be held and avoided when 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 (MODE01, Address Ah) D0=1 sets to 24-hour system ; D0=0 sets to 12-hour system. Set the 10-hour counter as D1=1 for p.m., D1=0 for a.m. * Leap year counter (MODE01, Address Bh) (D1, D0)=(0, 0) sets the counter for leap years. The counter value changes in 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. (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.
*) *)
Addresses 0h to Dh are applicable both for Read and Write. Addresses Eh to Fh are applicable only for Write.
6
RP/RF5C01A
OSCILLATOR CIRCUIT
* When the oscillator circuit is to be configured using crystal oscillators: The oscillator circuit is configured as shown in Figure 1. External components include: a resistor, a capacitor and a trimmer capacitor for fine tuning of the frequency. Adjust the trimmer capacitor (16Hz or 1Hz signal output from the ALARM pin is used) to correct oscillation frequency. Correction with 16Hz signal: Set addresses (A3, A2, A1, A0)=(1, 1, 1, 1). Set Data (D3, D2, D1, D0)=(1, 0, 0, ). Correction with 1Hz signal: Set addresses (A3, A2, A1, A0)=(1, 1, 1, 1). Set Data (D3, D2, D1, D0)=(0, 1, 0, ). In each case, set addresses (A3, A2, A1, A0)=(1, 1, 0, 1), and set data (D3, D2, D1, D0)=(, 0, , ) to disable ALARM output before setting 16Hz or 1Hz signal.
RP/RF5C01A
C1
OSCIN 16 R
C2
17 OSCOUT
C1=5pF to 30pF C2=30pF R=100kW (Crystal from Nihon Denpa Kogyo : MX38T)
GND
*)
Values of C1, C2 and R are not absolute conditions but are indicated for reference only. Regard those C1, C2 and R values shown above as our optimum values in our experiments which employed MX38T.
Difference between the RP5C01 and the RP/RF5C01A
Since the RP5C01 and the RP/RF5C01A have different oscillator circuit characteristics, approximately 12 to 19ppm (31 to 41 seconds/month) of difference will result if the RP/RF5C01A are used with an external value that has been set to the RP5C01 oscillating characteristics. Therefore, determine a new external value for the RP/RF5C01A.
7
RP/RF5C01A
PACKAGE DIMENSIONS
* RP5C01A (18pin DIP)
22.86max. 0.900max. 18 10 6.30.20 0.2480.008 1 5.08max. 0.200max. 1.30.35 0.0510.014 9
7.62 0.300 0.51min. 0.020min.
0
to
15
2.54min. 0.100min.
2.54 0.100
0.480.10 0.0190.004
0.25(0.010) M
1 +0.1 5 0 0.25 -0. 04 +0.0 0 .002 0.01 -0
(Unit : inch )
mm
* RP5C01A (18pin SOP)
11.63typ. 0.458typ.
18
10
10.310.3 0.4060.012 1 9 2.34typ. 0.092typ. 7.47typ. 0.294typ.
0.25 +0.1 -0.05 0.010 +0.004 -0.002
1.27typ. 0.050typ. 0.41 +0.1 -0.05 0.016 +0.004 -0.002
0.20.1 0.0080.004
0.660.2 0.0260.008
(Unit : inch )
mm
8
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
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RICOH CORPORATION ELECTRONIC DEVICES DIVISION
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