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DS1390U-33+T&R

RTC with trickle charger and 33-bit binary counter, TSSOP-16

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Pieza del fabricante：

DS1390U-33+T&R

Paquete：

TSSOP-16

Descripción

Productos

The DS1390U-33+T&R from Maxim is a real-time clock with a 33-bit binary counter and trickle charger for backup in TSSOP-16 for time-stamping and scheduling applications.

Especificaciones

Paquete

TSSOP-16

Características

See datasheet for complete specifications
Industry-standard package

Aplicaciones

Industrial control
Consumer electronics
Communication equipment
Automotive electronics

Introducción del producto:DS1390U-33+T&R Presentación del producto

The DS1390U-33+T&R from Maxim is a real-time clock with a 33-bit binary counter and trickle charger for backup in TSSOP-16 for time-stamping and scheduling applications.

Principio de funcionamiento:DS1390U-33+T&R Principio de funcionamiento

The DS1390U-33+T&R is a real-time clock (RTC) with 33-bit binary counter from Maxim Integrated in TSSOP-16, operating from 1.8-5.5V with SPI interface. Unlike traditional RTCs that count in BCD (seconds/minutes/hours), the DS1390 uses a 33-bit binary counter that increments every second from a 32.768kHz crystal, providing a monotonic timestamp that never wraps (2^33 seconds = 272 years). The binary counter simplifies firmware: no need to convert BCD to decimal, and time calculations are simple addition/subtraction. The device includes: (1) Two alarm registers that compare against the 33-bit counter; (2) Trickle charger (disabled on DS1390, enabled on DS1391) for charging a supercapacitor or rechargeable battery from VCC; (3) RST#/RST# outputs that assert during power-up or when VCC drops below VBACKUP; (4) SQW output with 1Hz, 4kHz, 8kHz, 16kHz, or 32kHz square wave; (5) 16 bytes of SRAM for storing calibration or configuration data. The SPI interface (mode 0 or 3, up to 4MHz) provides fast register access. The 33-bit counter is read as two consecutive SPI transactions (8 bits + 8 bits + 17 bits = 33 bits). The crystal oscillator draws only 300nA from VBACKUP, extending battery life to 10+ years with a CR2032 coin cell. The -33+T&R suffix specifies 33-bit counter, industrial temperature, tape-and-reel. Applications include: data logging timestamps, power-fail event recording, and long-duration timing.

Descripción de la clavija:DS1390U-33+T&R Definición y funciones de las clavijas

Pin	Nombre	Tipo	Función
1	X1	Entrada	32.768kHz crystal input (connects to external crystal, 12.5pF load)
2	X2	Salida	32.768kHz crystal output (complementary connection to crystal)
3	VBACKUP	Potencia	Backup supply (connects to battery or supercap, 2.0-5.5V)
4	GND	Potencia	Suelo
5	RST#/RST#	Salida	Reset outputs (active LOW and active HIGH, push-pull)
6	ES	Entrada	Enable (active HIGH, internal pull-up, LOW=disable outputs)
7	SQW/INTB	Salida	Square wave output / interrupt B (programmable 1Hz-32kHz or alarm)
8-16	D0-D7/CS/IO/SCLK	E/S	SPI data, chip select, SPI clock for 33-bit counter access

Application Scenarios:In which products and applications isDS1390U-33+T&R usado

Industrial control

Consumer electronics

Communication equipment

Automotive electronics

Alternative Models:What chips are recommended as replacements for DS1390U-33+T&R

Fabricante	Número de pieza	Paquete	Notas
Maxim	DS1390U-33+T&R	TSSOP-16	Same device, Maxim brand
Maxim	DS1391U-33+T&R	TSSOP-16	Same with trickle charger for supercap charging
Maxim	DS3234SN#	SOIC-20	RTC with TCXO, SPI, +/-2ppm accuracy
Epson	RX8130CE	SOP-14	RTC with 32kHz crystal, I2C, Epson brand
STMicroelectronics	M41T62Q6F	QFN-16	RTC with crystal, I2C, ST brand