DS1216B

Series: -
Voltage - Supply: 4.5 V ~ 5.5 V
Operating Temperature: 0°C ~ 70°C
Packaging: Tube
Manufacturer: Maxim Integrated Products
Controller Type: Smartwatch RAM
Package / Case: 28-DIP (0.600", 15.24mm) Socket
Supplier Device Package: 28-DIP Socket


Features:

 Keeps track of hundredths of seconds, seconds, minutes, hours, days, date of the month, months, and years
Converts standard 2K x 8 and 8K x 8 CMOS static RAMs into nonvolatile memory
Embedded lithium energy cell maintains watch information and retains RAM data
Watch function is transparent to RAM operation
Month and year determine the number of days in each month; leap year compensation valid up to 2100
Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
Proven gastight socket contacts
Full ±10% operating range
Operating temperature range 0°C to 70°C
Accuracy is better than ±1 minute/month @ 25°C


Pinout




Specifications

Voltage on any Pin Relative to Ground                  0.3V to +7.0V
Operating Temperature                                         0°C to 70°C
Storage Temperature                                            40°C to +70°C
Soldering Temperature                                          260°C for 10 seconds (See Note 6)


Description

The DS1216B SmartWatch/RAM 16/64K is a 28pin, 600-mil wide DIP socket with a builtin CMOS watch function, a nonvolatile RAM controller circuit, and an embedded lithium energy source. It accepts either 24pin 2K x 8 or 28pin 8K x 8 JEDEC bytewide CMOS static RAM. When the socket is mated with a CMOS SRAM, DS1216B provides a complete solution to problems associated with memory volatility and uses a common energy source to maintain time and date. A key feature of the DS1216B is that the watch function remains transparent to the RAM. The DS1216B monitors VCC for an outoftolerance condition. When such a condition occurs, an internal lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent loss of watch and RAM data.

Using the DS1216B saves PC board space since the combination of SmartWatch and the mated RAM take up no more area than the memory alone. The SmartWatch uses pins 28, 27, 26, 22, 20, 11, and 1 for RAM and watch control. All other pins are passed straight through to the socket receptacle.

The DS1216B provides timekeeping information including hundredths of seconds, seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with less than 31 days, including correction for leap years. The DS1216B operates in either 24hour or 12hour format with an AM/PM indicator.

Parameters:

Technical/Catalog Information	DS1216B
Vendor	Dallas Semiconductor
Category	Integrated Circuits (ICs)
Controller Type	Smartwatch RAM
Voltage - Supply	4.5 V ~ 5.5 V
Package / Case	28-SOIC
Packaging	Tube
Operating Temperature	0°C ~ 70°C
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	DS1216B DS1216B