Real-Time Clocks and Elapsed Time Counters with Serial Interfaces
Serial interface clocks provide 4-, 3-, or 2-wire solutions for systems requiring small real time clocks.
Real-Time Clocks
Mfr.'s No. of Package* Description
Type Pins
DS1302 8 DIP RTC, 3-wire Interface, 31 Bytes RAM, Trickle Charger
DS1305 16 DIP RTC, 3-, 4-wire Interface, 96 Bytes RAM, Trickle Charger, 2 Time-of-Day Alarms
DS1305E 20 TSSOP RTC, 3-, 4-wire Interface, 96 Bytes RAM, Trickle Charger, 2 Time-of-Day Alarms
DS1307 8 DIP RTC, 2-wire Interface, 56 Bytes RAM
DS1603 7 SIP Mod. 2 Counters, 3-wire Interface
DS1670E 20 TSSOP RTC, 3-wire Interface, CPU Reset, Watchdog, NV RAM Control, Time-of-Day Alarm, 8-Bit A/D, 3 V
Real-Time Clocks with Bytewide Interface
Dallas
Semiconductor
Clocks, Counters and PowerCap
806
b
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DS1243Y 28 Module 8 KB RAM, Phantom Interface for RTC
DS1243Y-120 28 Module 8 KB RAM, Phantom Interface for RTC
DS1244Y 28 Module 32 KB RAM, Phantom Interface for RTC
DS1244Y-120 28 Module 32 KB RAM, Phantom Interface for RTC
DS1244Y-150 28 Module 32 KB RAM, Phantom Interface for RTC
DS1248Y-100 32 Module 128 KB RAM, Phantom Interface for RTC
DS1251Y-100 32 Module 512 KB RAM, Phantom Interface for RTC
DS1642-100 24 Module 2 KB RAM
DS1643-100 28 Module 8 KB RAM
DS1646L-120 34 LPM 128 KB RAM
DS1742-100 28 Module 2 KB RAM
DS1744-100 28 Module 32 KB RAM
DS1744W-120 28 Module 32 KB RAM
DS1746-100 32 Module 128 KB RAM
DS1746W-120 32 Module 128 KB RAM
DS1747W-120 32 Module 128 KB RAM
Watchdog Timekeepers with Bytewide Interface
Watchdog Timekeepers provide, time-of-day alarm and microprocessor reset. Available in PowerCap except DS1501 and DS1511.
DS1286 28 Module 50 Bytes RAM, Time of Day Alarm
DS1386-32-120 32 Module 32 KB RAM, Time of Day Alarm
DS1501W 28 DIP/TSOP/SOIC 256 Bytes RAM, KS, WU, 3.3 V, Y2K
DS1501Y 28 DIP/TSOP/SOIC 256 Bytes RAM, KS, WU, 5 V, Y2K
DS1511W 28 Module 256 Bytes RAM, KS, WU, 3.3 V, Y2K
DS1511Y 28 Module 256 Bytes RAM, KS, WU, 5 V, Y2K
DS1543-100 28 Module 8 KB RAM
DS1543W-120 28 Module 8 KB RAM
DS1553-100 28 Module 8 KB RAM
DS1553W-120 28 Module 8 KB RAM
DS1554-100 32 Module 32 KB RAM
DS1554W-120 32 Module 32 KB RAM
DS1556-100 32 Module 128 KB RAM
DS1556W-120 32 Module 128 KB RAM
DS1557P-100 34 Power Cap 512 KB RAM
DS1557WP-120 34 Power Cap 512 KB RAM
Real-Time Clocks with Multiplexed Address/Data Bus
Multiplexed address/data bus clocks provide time-of-day alarm, programmable square wave output and a programmable interrupt output in addition to clock and calendar.
DS12887 24 Module 114 Bytes RAM
DS14287 24 Module 114 Bytes RAM, NV RAM Control
DS1693 28 Module 114 Bytes RAM, NV RAM Cont., KS, S/N, WU, V
BAUX
DS17287-5 24 Module 114+ 2 KB RAM, KS, S/N, WU, V
BAUX
, 5 V
DS17487-3 24 Module 114+ 4 KB RAM, KS, S/N, WU, V
BAUX
, 3 V
DS17887-5 24 Module 114+ 4 KB RAM, KS, S/N, WU, V
BAUX
, 5 V
Sockets with Real Time Clocks
DS1216C 28 Socket RAM: 8 KB, 32 KB
DS1216D 32 Socket RAM: 8 KB, 32 KB, 128 KB
DS1216E 28 Socket ROM: 8 KB, 32 KB
DS1216E-3 28 Socket ROM: 8 KB, 32 KB, 3 V
DS1216F 32 Socket ROM: 8 KB, 32 KB, 128 KB
DS1216F-3 32 Socket ROM: 8 KB, 32 KB, 128 KB, 3 V
DS1216H 32 Socket RAM: 512 KB
*All modules contain 32.768 KHz crystal and embedded lithium energy source.
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To obtain technical support, call the support center. Voice support is available 8:00 AM to 5:00 PM (CST).
Bytewide interface clocks provide additional general-purpose RAM. Accept SRAMs or ROMs or densities indicated.
Phantom interface clocks are transparent to the system until a particular 64-bit data sequence has been recognized.
Available in PowerCap except DS1742.
The DS9034PC PowerCap is a snap-on lithium power source which provides 10 years of battery backup power for
Nonvolatile SRAMs in Dallas SemiconductorÕs surface-mountable PowerCap Module (PCM) package. After a PowerCap
Module has been soldered in place, the DS9034PC PowerCap is snapped onto the PCM to form a complete Nonvolatile
SRAM module. The PowerCap is keyed to prevent incorrect attachment and is designed to maintain mechanical and
electrical contact with its host PowerCap Module even during severe mechanical shock and vibration. Periodic
replacement allows Nonvolatile SRAM module life to be extended indefinitely. The DS9034PC is easily removed by
inserting a regular screwdriver into the detachment feature and prying gently outward and upward to release the
PowerCap from the PCM board.
To be used with Mfr.Õs Type Ñ DS1230YP-70, DS1245YP-70, DS1250YP-70, DS1230WP-150, DS1245WP-150,
DS1250WP-150, DS1330WP-150, DS1345-150, DS1350WP-150. See next page for information on these devices.
DS9034PC PowerCap
Mfr.Õs Nominal Nominal Data
Type Voltage Capacity Retention Life
DS9034PC 3 V 130 mAH 10 Years (25¡C)
13
