DS1244W-120IND Maxim Integrated Products, DS1244W-120IND Datasheet
DS1244W-120IND
Specifications of DS1244W-120IND
Related parts for DS1244W-120IND
DS1244W-120IND Summary of contents
Page 1
... Available in Lead-Free Package PowerCap is a registered trademark of Maxim Integrated Products, Inc.. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. ...
Page 2
... EMOD (0.740a) 3.3 28 EMOD (0.740a) 3.3 28 EMOD (0.740a) 3.3 34 PowerCap* 3.3 34 PowerCap* 3.3 34 PowerCap* 3.3 34 PowerCap* 3.3 28 EMOD (0.740a) 5.0 28 EMOD (0.740a) 5.0 34 PowerCap* 5.0 34 PowerCap* 5 TOP MARK DS1244W-120 DS1244W-120+ DS1244W-120IND DS1244W-120IND+ DS1244WP-120 DS1244WP-120+ DS1244WP-120IND DS1244WP-120IND+ DS1244Y-70 DS1244Y-70+ DS1244YP-70 DS1244YP-70+ ...
Page 3
PIN DESCRIPTION PIN NAME EDIP PowerCap 1 1 A14/RST 1 32 A14 2 30 A12 A10 23 29 A11 ...
Page 4
... V condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent garbled data in both the memory and real-time clock. The phantom clock provides timekeeping information for hundredths of seconds, seconds, minutes, hours, days, date, months, and years ...
Page 5
... After recognition is established, the next 64 read or write cycles either extract or update data in the phantom clock, and memory access is inhibited. Data transfer to and from the timekeeping function is accomplished with a serial bit stream under control of the chip enable, output enable, and write enable. Initially, a read cycle to any memory location using the and ...
Page 6
PHANTOM CLOCK REGISTER INFORMATION The phantom clock information is contained in eight registers of 8 bits, each of which is sequentially accessed 1 bit at a time after the 64-bit pattern recognition sequence has been completed. When updating the phantom ...
Page 7
Figure 2. PHANTOM CLOCK REGISTER DEFINITION AM/PM/12/24 MODE Bit 7 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 ...
Page 8
BATTERY LONGEVITY The DS1244 has a lithium power source that is designed to provide energy for clock activity and clock and RAM data retention when the V is sufficient to power the DS1244 continuously for the life of the equipment ...
Page 9
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………..-0.3V to +6.0V Storage Temperature Range………………………………………………-40ºC to +85ºC (noncondensing) Soldering Temperature……………………………………….See IPC/JEDEC J-STD-020 (DIP) (Note 13) This is a stress rating only and functional operation of the device at these ...
Page 10
... Standby Current 0.5V CC Operating Current t = 70ns CYC Write Protection Voltage Battery Switchover Voltage CAPACITANCE PARAMETER Input Capacitance Input/Output Capacitance MEMORY AC ELECTRICAL CHARACTERISTICS PARAMETER Read Cycle Time Access Time to Output Valid OE to Output Valid Output Active OE CE Output High-Z from Deselection Output Hold from Address Change ...
Page 11
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS PARAMETER Read Cycle Time Access Time CE Access Time OE to Output Low Output Low Output High Output High-Z OE Read Recovery Write Cycle Time Write Pulse Width Write ...
Page 12
... Access Time CE Access Time OE to Output Low Output Low Output High Output High-Z OE Read Recovery Write Cycle Time Write Pulse Width Write Recovery Data Setup Time Data Hold Time Pulse Width CE Pulse Width RESET DS1244W-120 SYMBOL MIN t 120 RC t ACC COE 120 ...
Page 13
POWER-DOWN/POWER-UP TIMING PARAMETER at V before Power-Down Slew from PF(MAX PF(MIN Slew from PF(MAX PF(MIN ...
Page 14
... MEMORY READ CYCLE (Note 1) MEMORY WRITE CYCLE 1 (Notes 2, 6, and ...
Page 15
... MEMORY WRITE CYCLE 2 (Notes 2 and 8) RESET FOR PHANTOM CLOCK READ CYCLE TO PHANTOM CLOCK ...
Page 16
WRITE CYCLE TO PHANTOM CLOCK ...
Page 17
POWER-DOWN/POWER-UP CONDITION, 5V POWER-DOWN/POWER-UP CONDITION, 3. ...
Page 18
AC TEST CONDITIONS Output Load: 50pF + 1TTL Gate Input Pulse Levels Timing Measurement Reference Levels Input: 1.5V Output: 1.5V Input Pulse Rise and Fall Times: 5ns NOTES high for a read cycle. 2) ...
Page 19
... Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product. No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. DOCUMENT NO. 21-0245 ...