NR8576BA

NR8576 series Real-time Clock Modules OVERVIEW The NR8576 series devices are serial-interface type real-time clock module ICs with built-in crystal oscillator elements. They feature timer counter circuits that keep track of time from the current second to the current year, automatic leap-year adjustment, and a supply voltage detect function. Also, a 32.768kHz/1Hz select output function is incorporated for independent hardware control. They are available in compact 14-pin SOPs (NR8576A×) and miniature 18-pin SOPs (NR8576B×). FEATURES I I I I Crystal oscillator element built-in for adjustmentfree use Timer counters for second, minute, hour, day, day of the week, month, and year 2.5 to 5.5V operating voltage range 1.7 ± 0.3V supply voltage detection threshold I I I I 1.0µA at 3.0V (typ) current consumption Automatic leap-year calendar adjustment 32.768kHz and 1Hz output selectable Package • 14-pin SOP (NR8576A×) • 18-pin SOP (NR8576B×) PINOUTS 14-pin SOP 18-pin SOP NC 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 NC NC NC NC VDD NC CLK DATA FOUT VSS NC CE FSEL WR FOE NC 1 2 3 4 5 6 7 14 13 12 11 10 9 8 FOUT NC NC DATA CLK VDD NC NC NC NC FOE WR FSEL CE VSS PACKAGE DIMENSIONS (Unit: mm) 14-pin SOP 10.1 0.2 0 10 18-pin SOP 11.4 0.2 0 10 7.4 0.2 7.8 0.2 5.0 5.4 0.10 0.05 1.8 0.1 1.27 0.35 0.1 3.2 0.1 1.27 0.4 0.1 SERIES CONFIGURATION Device NR8576AA NR8576AB NR8576BA NR8576BB Package 14-pin SOP 14-pin SOP 18-pin SOP 18-pin SOP Frequency deviation 5 ± 12 ppm 5 ± 23 ppm 5 ± 12 ppm 5 ± 23 ppm SEIKO NPC CORPORATOIN—1 0.05 0.05 0.15 0.6 0.2 0.15 0.6 0.2 NR8576 series BLOCK DIAGRAM VDD 32.768kHz VSS OSC FOUT FSEL FOE DATA CLK WR CE Divider Timer Counter Output Controller Voltage Detect I/O Controller Shift Register Control Circuit PIN DESCRIPTION Name VSS I/O – Description Ground Connect a ≥ 0.1µF capacitor between VDD and VSS. Chip enable. HIGH: Enable LOW: DATA goes high impedance; input on WR, CLK, and DATA stops; and the TM bit is cleared. FOUT output frequency select. HIGH: 1Hz LOW: 32.768kHz DATA input/output control switch. HIGH: Data input mode (RTC write) LOW: Data output mode (RTC read) FOUT output enable control. HIGH: The frequency selected by FSEL is output on FOUT. LOW: FOUT goes high impedance. Supply voltage. Connect a ≥ 0.1µF capacitor between VDD and VSS. System clock input. Data is input (RTC write mode) and output (RTC read mode) on the rising edge of CLK. Data read and write input/output Frequency output (output controlled by FOE and frequency selected by FSEL). In 1Hz output mode, the 1Hz signal is synchronized to the internal 1 second signal. FOUT output is not affected by the CE signal. No connection. Leave open for normal use. CE I FSEL I WR I FOE I VDD CLK DATA FOUT NC – I I/O O – SEIKO NPC CORPORATOIN—2 NR8576 series SPECIFICATIONS Absolute Maximum Ratings VSS = 0V unless otherwise noted. Parameter Supply voltage range Input voltage range Output voltage range Storage temperature range Symbol VDD VIN VOUT TSTG Condition Ta = 25°C Ta = 25°C Ta = 25°C Rating −0.3 to 7.0 VSS − 0.3 to VDD + 0.3 VSS − 0.3 to VDD + 0.3 −55 to 125 Unit V V V °C Recommended Operating Conditions VSS = 0V unless otherwise noted. Parameter Supply voltage range Clock supply voltage range Operating temperature range Symbol VDD VCLK TOPR Condition Rating 2.5 to 5.5 1.4 to 5.5 −40 to 85 Unit V V °C Oscillator Characteristics VSS = 0V unless otherwise noted. Parameter Frequency deviation Symbol ∆f/fO TOP f/V tSTA fA Condition Ta = 25°C, VDD = 5.0V NR8576×A NR8576×B Rating 5 ± 12 5 ± 23 +10/−120 ±2 max 3 max ±5 max Unit ppm ppm ppm ppm/V sec ppm/year Frequency temperature characteristic Frequency voltage characteristic Oscillator start time Aging Ta = −10 to 70°C, VDD = 5.0V, 25°C std Ta = 25°C, VDD = 2.0 to 5.5V Ta = 25°C, VDD = 2.5V Ta = 25°C, VDD = 5.0V, first year SEIKO NPC CORPORATOIN—3 NR8576 series DC Electrical Characteristics VSS = 0V, VDD = 5.0V ± 10%, Ta = −40 to 85°C unless otherwise noted. Rating Parameter Symbol IDD1 IDD2 Current consumption IDD3 IDD4 IDD5 IDD6 HIGH-level input voltage LOW-level input voltage Input OFF leakage current VIH VIL IOFF VOH1 VOH2 LOW-level output voltage Output load fanout Output leakage current Supply voltage detect threshold voltage VOL1 VOL2 N/CL IOZH IOZL VDT VDD = 5.0V VDD = 3.0V VDD = 2.0V VDD = 5.0V VDD = 3.0V VDD = 2.0V Condition min CE = VSS, FOE = VSS, FSEL = VDD, FOUT: floating – – – – – – 0.8VDD – – 4.5 2.0 – – typ 1.5 1.0 0.5 4.0 2.5 1.5 – – – – – – – 2 LSTTL/30pF max −1.0 −1.0 1.4 – – 1.7 1.0 1.0 2.0 µA µA V max 3.0 2.0 1.0 10.0 6.5 4.0 – 0.2VDD 0.5 – – 0.5 0.8 µA µA µA µA µA µA V V µA V V V V Unit CE = VSS, FOE = VDD, FSEL = VSS, FOUT: 32kHz output CE, FSEL, WR, FOE, CLK, DATA CE, FSEL, WR, FOE, CLK, DATA CE, FSEL, WR, FOE, CLK; VIN = VDD or VSS VDD = 5.0V VDD = 3.0V VDD = 5.0V VDD = 3.0V FOUT VOUT = 5.5V; DATA, FOUT VOUT = 0V; DATA, FOUT IOH = −1.0mA; DATA, FOUT IOL = 1.0mA; DATA, FOUT HIGH-level output voltage SEIKO NPC CORPORATOIN—4 NR8576 series AC Characteristics Ta = −40 to 85°C, CL = 50pF unless otherwise noted. Rating Parameter Symbol VDD = 5V ± 10% min CLK clock period CLK LOW-level pulsewidth CLK HIGH-level pulsewidth CE setup time CE hold time CE enable time Write data setup time Write data hold time WR setup time WR hold time DATA output delay time DATA output floating time Clock rise time Clock fall time FOUT rise time (CL = 30pF) FOUT fall time (CL = 30pF) Disable time (CL = 30pF) tCLK tCLKL tCLKH tCES tCEH tCE tSD tHD tWRS tWRH tDATD tDZ tr1 tf1 tr2 tf2 tHZ tLZ Enable time (CL = 30pF) FOUT duty cycle (CL = 30pF) Wait time tZH tZL Duty tRCV 0.75 0.375 0.375 0.375 0.375 – 0.1 0.1 100 100 – – – – – – – – – – 40 0.95 max 7800 3900 3900 3900 – 0.9 – – – – 0.2 0.1 50 50 100 100 100 100 100 100 60 – VDD = 3V ± 10% min 1.5 0.75 0.75 0.75 0.75 – 0.2 0.1 100 100 – – – – – – – – – – 40 1.9 max 7800 3900 3900 3900 – 0.9 – – – – 0.4 0.2 100 100 200 200 200 200 200 200 60 – µs µs µs µs µs sec µs µs ns ns µs µs ns ns ns ns ns ns ns ns % µs Unit SEIKO NPC CORPORATOIN—5 NR8576 series Timing Diagrams Data read tCE WR tWRS tWRH CE tCES CLK tCLKH tCLKL DATA tDATD Data write tCLK tCEH tRCV tf1 tr1 tDZ tCE WR tWRS CE tCES CLK tCLKH tCLKL tSD tHD DATA tf1 tr1 tCLK tCEH tRCV tWRH SEIKO NPC CORPORATOIN—6 NR8576 series FOUT tf2 90% tH 50% 10% FOUT tr2 t Duty = tH t 100 (%) Disable/Enable tZH FOE 50% 50% tHZ 90% FOUT 10% tZL FOE 50% 50% tLZ 90% FOUT 10% Note that FOE and FSEL do not have chatter elimination circuits. Consequently, switching either FOE or FSEL during 32kHz mode operation may generate chatter noise on the FOUT output. Also, note that the 1Hz and 32kHz oscillators are not synchronized to each other, so switching intervals shortens the duty cycle. Accordingly, a wait time (≥ chattering time + output frequency period) should be incorporated when switching intervals. SEIKO NPC CORPORATOIN—7 NR8576 series FUNCTIONAL DESCRIPTION Timer data configuration I I I I Counter data in BCD code format Automatic long/short month and leap-year adjustment 24-hour time display LSB first write and read data MSB LSB S40 S20 S10 S8 S4 S2 S1 Second ( 0 to 59 ) FDT Minute ( 0 to 59 ) ∗ mi40 mi20 mi10 mi8 mi4 mi2 mi1 Hour ( 0 to 23 ) ∗ ∗ h20 h10 h8 h4 h2 h1 Week ( 1 to 7 ) ∗ w4 w2 w1 Day ( 1 to 31 ) ∗ ∗ d20 d10 d8 d4 d2 d1 Month ( 1 to 12 ) TM ∗ ∗ mo10 mo8 mo4 mo2 mo1 Year ( 0 to 99 ) y80 y40 y20 y10 y8 y4 y2 y1 1. * bit: Optional write bits. 2. FDT bit: Supply voltage detect bit • The FDT bit is set to 1 when the voltage between VDD and VSS falls below 1.7 ± 0.3V. • The FDT bit is reset to 0 for data reads longer than 48 bits. Note that the FDT bit is not reset to 0 for data reads of 47 bits or less. • The read/write data bits should be should be set to 0. After the supply voltage is applied, the FDT bit should be set to 0. VDD VDET 0.5 second 0.5 second Detected Pulse CE (READ MODE) FDT 3. TM bit: Factory test bit. Should be set to 0 for normal use. SEIKO NPC CORPORATOIN—8 NR8576 series Data Read 1 2 3 52 53 54 54+n CLK CE WR DATA OUTPUT MODE S1 S2 S4 S8 S10 S20 S40 FDT y8 y10 y20 y40 y80 second year NON CHANGE OUTPUT DATA Data is output when WR is LOW and CE is HIGH. Time and calendar data is loaded into shift registers on the first rising edge of the clock CLK, and the seconds’ digit LSB is output on DATA. The data is then loaded and shifted in the sequence second, minute, hour, week, day, and month on the rising edge of CLK, and output on DATA. The output data is valid after 52 rising edges of the clock; data input after 52 cycles does not alter the first 52 bits of valid data. Within the 52 cycles of valid data, data already input can be output if there is a falling edge of CE after the corresponding number of cycles. For example, the data comprising the second-to-week is output is CE goes LOW after 28 clock cycles. For continuous data reads, a wait time (tRCV) is required before the next data cycle if CE has gone LOW. Note that if an update operation (a 1s carry) occurs during a data read, an error of −1s in the read data is generated. The data read time should be completed after tCE ≤ 0.9s. SEIKO NPC CORPORATOIN—9 NR8576 series Data Write 1 2 3 52 53 54 54+n CLK CE WR DATA INPUT MODE S1 S2 S4 S8 S10 S20 S40 FDT y8 y10 y20 y40 y80 second year Data is input when WR is HIGH and CE is HIGH. The seconds’ digit signal to the timer counter stops on the first falling edge of CLK and the counter remains stopped until the next rising edge of CE. The 1Hz to 128Hz frequency divider step counters are reset during the interval between the first and second rising edges of CLK. The data is then input on DATA into the shift register, starting with seconds’ digit LSB synchronized with the rising edge of CLK. After the final data is input into the shift register following 52 cycles, the shift register contents are transferred to the timer counters. Note that a data write must contain 52 bits of input data. If CE goes LOW before 52 bits are input, the input data is invalid. If the input data exceeds 52 bits, data from the 53rd bit is ignored (the first 52 bits remain valid). The data write time should be completed after tCE ≤ 0.9s. If a data read occurs immediately after a data write, a wait time (tRCV) is required if CE has gone LOW. Note that writing null data will cause incorrect operation. All bits must be valid data bits. SEIKO NPC CORPORATOIN—10 NR8576 series Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORATION (hereinafter “NPC”). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SEIKO NPC CORPORATION 15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: sales@npc.co.jp NC9603DE 2006.08 SEIKO NPC CORPORATOIN—11