1338-31DCGI8 IDT, Integrated Device Technology Inc, 1338-31DCGI8 Datasheet
1338-31DCGI8
Specifications of 1338-31DCGI8
Related parts for 1338-31DCGI8
1338-31DCGI8 Summary of contents
Page 1
... REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM General Description The IDT1338 is a serial real-time clock (RTC) device that consumes ultra-low power and provides a full binary-coded decimal (BCD) clock/calendar with 56 bytes of battery backed Non-Volatile Static RAM. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information ...
Page 2
... Connections for standard 32.768 kHz quartz crystal. The internal oscillator circuitry is designed for operation with a crystal having a specified load capacitance (CL) of 12.5 pF. An external 32.768 kHz oscillator can also drive the IDT1338. In this configuration, the X1 pin is connected to the external oscillator signal and the X2 pin is left floating. ...
Page 3
... Ct1 and Ct2 are the PCB trace capacitances between the crystal and the device pins the shunt capacitance of the crystal (as specified in the crystal manufacturer's datasheet or measured using a network analyzer). Note: IDT1338CSRI integrates a standard 32.768 kHz crystal in the package and contributes an additional frequency error of 10ppm at nominal +25°C. T ...
Page 4
... Frequency Tolerance The frequency tolerance for 32 KHz crystals should be specified at nominal temperature (+25°C) on the crystal manufacturer datasheet. The crystals used with IDT1338 typically have a frequency tolerance of +/-20ppm at +25° C. Specifications for a typical 32kHz crystal used with our device are shown in the table below. ...
Page 5
... BAT V CC Symbol Conditions t (see note below) REC PF(MIN) VCCF PF(MAX) VCCR Supply Condition Read/Write Access V < < BAT V < > BAT V > < Yes BAT V > > Yes BAT Min. Typ. 300 0 IDT1338 RTC Powered By V BAT Max. Units 2 ms µs µs REV K 032910 ...
Page 6
... Therefore important to enable the oscillator ( during initial configuration. The IDT1338 runs in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as the 12-hour or 24-hour mode-select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit, with logic high ...
Page 7
... The table below lists the square-wave frequencies that can be selected with the RS bits. Table 5. Square Wave Output OUT RS1 RS0 SQW Output IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 7 Bit 5 Bit 4 Bit 3 OSF SQWE SQWE 4.096 kHz 1 8.192 kHz 1 32.768 kHz Bit 2 Bit 1 Bit 0 0 RS1 RS0 IDT1338 RTC REV K 032910 ...
Page 8
... The IDT1338 works in both modes. Connections to the bus are made via the open-drain I/O lines SDA and SCL. The following bus protocol has been defined (see the “Data ...
Page 9
... However, in this mode, the direction bit indicates that the transfer direction is reversed. Serial data is transmitted on SDA by the IDT1338 while the serial clock is input on SCL. START and STOP conditions are recognized as the beginning and end of a serial transfer (see the “Data Read– ...
Page 10
... The address pointer is incremented after each byte is transferred. The IDT1338 must receive a “not acknowledge” to end a read. Data Write – Slave Receiver Mode Data Read (from current Pointer location) – ...
Page 11
... Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the IDT1338. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. ...
Page 12
... CC I OLSDA < > 1.71 V < 0.2 OLSQW OL 1.3 V < 0.2 OL IDT1338-18 IDT1338-31; I CCA IDT1338-31; 3.63 V < 5.5 V IDT1338-18 IDT1338-31; I CCS IDT1338-31; 3.63 V < 5.5 V Active BATLKG Symbol Conditions =3 Note 7 BAT BATOSC1 =3 Note 7 BAT BATOSC2 I Note 7 BATDAT Conditions Min. Typ < ...
Page 13
... Typ. Max. Units 100 400 kHz 0 100 1.3 µs 4.7 0.6 µs 4.0 1.3 µs 4.7 0.6 µs 4.0 0.6 µs 4.7 0 0.9 µs 0 100 ns 250 20 + 0.1C 300 0.1C 1000 0.1C 300 0.1C 300 B 0.6 µs 4.0 400 100 ms IDT1338 REV K 032910 ...
Page 14
... LOW period (t is the period of time the oscillator must be stopped for the OSF flag to be set over the < MAX and 1.3 V < BACKUP CC CC SU:DAT < 3.7 V. IDT1338 RTC of IHMIN ) of the SCL LOW > to 250 ns must + R(MAX) REV K 032910 ...
Page 15
... SQWE=1 32767.850000 SQWE=0 32767.800000 32767.750000 60 80 Icc vs Vcc (IDT1338-31) 3.2 3.7 4.2 4.7 5.2 Vcc (V) Oscillator Frequency vs Supply Voltage 2.7 3.2 3.7 4.2 4.7 Oscillator Supply Voltage (V) IDT1338 RTC SCL=400kHz SCL=0Hz Freq 5.2 REV K 032910 ...
Page 16
... Min. Still air JA 1 m/s air flow JA 3 m/s air flow JA JC RTC Typ. Max. Units 95 C/W 48 C/W Typ. Max. Units 150 C/W 140 C/W 120 C/W 40 C/W Typ. Max. Units 120 C/W 115 C/W 105 C/W 58 C/W IDT1338 REV K 032910 ...
Page 17
... Bottom marking: country of origin if not USA. IDT® REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM 17 Marking Diagram 18GI YWW$ IDT1338-18DVGI 8 5 IDT1339 -18DCGI #YYWW IDT1338-18DCGI (16 SOIC IDT 1338C-31 SRI #YYWW**$ 1 8 IDT1338C-31SRI 16 9 IDT 1338C-18 SRI #YYWW**$ 1 8 IDT1338C-18SRI IDT1338 REV K 032910 RTC ...
Page 18
... C 0.19 0.25 .0075 D 4.80 5.00 .1890 E 3.80 4.00 .1497 e 1.27 BASIC 0.050 BASIC H 5.80 6.20 .2284 h 0.25 0.50 .010 L 0.40 1.27 .016 IDT1338 RTC Inches Max .0688 .0098 .020 .0098 .1968 .1574 .2440 .020 .050 8 C REV K 032910 ...
Page 19
... BASIC 0.118 BASIC 4.90 BASIC 0.193 BASIC 3.00 BASIC 0.118 BASIC 0.65 Basic 0.0256 Basic 0.40 0.80 0.016 0.032 0.10 - 0.004 c L IDT1338 REV K 032910 RTC ...
Page 20
... D 10.10 10.50 0.397 E 10.00 10.65 0.394 7.40 7.60 0.291 e 1.27 Basic 0.050 Basic L 0.40 1.27 0.016 0. IDT1338 RTC Max 0.104 -- 0.100 0.020 0.013 0.413 0.419 0.299 0.050 8 0.004 REV K 032910 ...
Page 21
... The IDT1338 packages are RoHS compliant. Packages without the integrated crystal are Pb-free; packages that include the integrated crystal (as designated with a “C” before the dash number) may include lead that is exempt under RoHS requirements ...
Page 22
... Added new note to Part Ordering information pertaining to RoHS compliance and Pb-free devices. C J.Sarma 04/03/04 combined -3 and -33 parts to -31 D J.Sarma 05/19/08 The part number for 16pin RoHS complaint part has now changed from IDT1338C-31SOGI to IDT1338C-31SRI and the IDT1338C-18SOGI changed to IDT1338C-18SRI E J.Sarma 10/29/08 F J.Sarma 11/10/08 Updated Block Diagram ...
Page 23
... IDT1338 REAL-TIME CLOCK WITH BATTERY BACKED NON-VOLATILE RAM Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. www.idt.com © 2010 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, ICS, and the IDT logo are trademarks of Integrated Device Technology, Inc ...