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Details, datasheet, quote on part number:NR8576BA
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Datasheet text preview:
NR8576 Series
NIPPON PRECISION CIRCUITS INC.
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 32.768 kHz/1 Hz select output function is incorporated for independent hardware control. They are available in compact 14-pin SOPs (NR8576A×) and miniature 18-pin SOPs (NR8576B×).
PINOUTS
14-pin SOP
VSS N.C CE FSEL WR FOE N.C
1 2 3 4 5 6 7
14 13 12 11 10 9 8
FOUT N.C N.C DATA CLK VDD N.C
NR8576A
FEATURES
s
s
s s s s s s
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 5.5 V operating voltage range 1.7 ± 0.3 V supply voltage detection threshold 1.0 µA at 3.0 V (typ) current consumption Automatic leap-year calendar adjustment 32.768 kHz and 1 Hz output selectable Package · 14-pin SOP (NR8576A×) · 18-pin SOP (NR8576B×)
18-pin SOP
N.C N.C N.C N.C FOE WR FSEL CE VSS
1
18
N.C N.C N.C N.C VDD N.C CLK DATA FOUT
NR8576B
2 3 4 5 6 7 8 9
17 16 15 14 13 12 11 10
SERIES CONFIGURATION
Device NR8576AA NR8576AB NR8576BA NR8576BB P a ck a g e 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
NIPPON PRECISION CIRCUITS--1
NR8576 Series
PACKAGE DIMENSIONS
Unit: mm
14-pin SOP 18-pin SOP
10.1 0.2
0 10
11.4 0.2
0 10
7.4 0.2
7.8 0.2
5 .0
5.4
0.6 0.2
1.8 0.1
3.2 0.1
0.10 0.05
1.27
0.35 0.1
1.27
0.4 0.1
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
NIPPON PRECISION CIRCUITS--2
0.05 0.05
0.15
0.15
0.6 0.2
NR8576 Series
PIN DESCRIPTION
Name VSS CE I/O I Ground Chip enable. HIGH: Enable L OW: DATA goes high impedance; input on WR, CLK, and DATA stops; and the TM bit is cleared. FOUT output frequency select. HIGH: 1 Hz L OW: 32.768 kHz DATA input/output control switch. HIGH: Data input mode (RTC write) L OW: Data output mode (RTC read) FOUT output enable control. HIGH: The frequency selected by FSEL is output on FOUT. L OW: FOUT goes high impedance. Supply voltage. Connect a 0.1 µF 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 1 Hz output mode, the 1 Hz 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. Description
FSEL
I
WR
I
FOE
I
VDD CLK DATA FOUT N. C
I I/O O
SPECIFICATIONS
Absolute Maximum Ratings
VSS = 0 V
Parameter Supply voltage range Input voltage range Output voltage range Storage temperature range Soldering temperature Soldering time Symbol V DD V IN VOUT Tstg Tsld tsld Condition Ta = 25 °C Ta = 25 °C Ta = 25 °C Rating -0.3 to 7.0 V SS - 0.3 to V DD + 0.3 V SS - 0.3 to V DD + 0.3 -55 to 125 260 10 Unit V V V °C °C s
Recommended Operating Conditions
VSS = 0 V
Parameter Supply voltage range Clock supply voltage range Operating temperature range Symbol V DD V CLK Topr Condition Rating 2.5 to 5.5 1.4 to 5.5 -40 to 85 Unit V V °C
NIPPON PRECISION CIRCUITS--3
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