DS1744W-120+ Maxim Integrated Products, DS1744W-120+ Datasheet
DS1744W-120+
Specifications of DS1744W-120+
Related parts for DS1744W-120+
DS1744W-120+ Summary of contents
Page 1
Rev 9/10 www.maxim-ic.com FEATURES Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations. ...
Page 2
PIN DESCRIPTION PIN NAME EDIP PowerCap 1 32 A14 2 30 A12 A10 23 ...
Page 3
... ORDERING INFORMATION VOLTAGE PART (V) DS1744-70+ 5.0 DS1744-70IND+ 5.0 DS1744W-120+ 3.3 DS1744W-120IND+ 3.3 DS1744P-70+ 5.0 DS1744P-70IND+ 5.0 DS1744WP-120+ 3.3 DS1744WP-120IND+ 3.3 +Denotes a lead(Pb)-free/RoHS-compliant package. *DS9034-PCX+ or DS9034I-PCX+ required (must be ordered separately). **A “+” anywhere in the top mark denotes a lead-free device. An “IND” denotes an industrial temperature grade device. ...
Page 4
Figure 1. DS1744/DS1744P Block Diagram PACKAGES The DS1744 is available in two packages (28-pin encapsulated DIP and 34-pin PowerCap module). The 28-pin EDIP module integrates the crystal, lithium energy source, and silicon all in one package. The 34- pin PowerCap ...
Page 5
Table 1. Truth Table > < V < < V < SETTING THE ...
Page 6
Table 2. Register Map ADDRESS B7 B6 7FFF 10 Year 7FFE X X 7FFD X X 7FFC BF FT 7FFB X X 7FFA X OSC 7FF9 7FF8 W R OSC = Stop Bit R = Read Bit W = Write ...
Page 7
DATA-RETENTION MODE The 5V device is fully accessible and data can be written or read only when V However, when V is below the power-fail point internal clock registers and SRAM are blocked from any access. At this ...
Page 8
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………..…….…...……..……..……...……………..…-0.3V to +6.0V Storage Temperature Range EDIP..........................……………………..………………………………………………………...-40°C to +85°C PowerCap..................……………………..……………………………………………………….-55°C to +125°C Lead Temperature (soldering, 10s)……….................................................................………………………………..+260°C Note: EDIP is hand or wave-soldered only. Soldering Temperature (reflow, PowerCap).................................................................................................................+260°C This is a ...
Page 9
DC ELECTRICAL CHARACTERISTICS = 3.3V 10 Over the operating range PARAMETER Active Supply Current TTL Standby Current ( CMOS Standby Current ( CE 0.2V) CC Input Leakage ...
Page 10
AC CHARACTERISTICS—READ CYCLE (3.3V) = 3.3V 10 Over the operating range PARAMETER Read Cycle Time Address Access Time Low-Z CE Access Time CE Data Off Time Low-Z OE Access ...
Page 11
AC CHARACTERISTICS—WRITE CYCLE (5V) = 5.0V 10 Over the operating range PARAMETER Write Cycle Time Address Setup Time WE Pulse Width CE Pulse Width Data Setup Time Data Hold Time Data Hold Time Address Hold ...
Page 12
WRITE CYCLE TIMING DIAGRAM, WRITE-ENABLE CONTROLLED WRITE CYCLE TIMING DIAGRAM, CHIP-ENABLE CONTROLLED DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs ...
Page 13
POWER-UP/DOWN AC CHARACTERISTICS (5V) = 5.0V 10 Over the operating range PARAMETER Before Power-Down IH V Fall Time PF(MAX) PF(MIN) V Fall Time ...
Page 14
POWER-UP/DOWN CHARACTERISTICS (3.3V) = 3.3V 10 Over the operating range PARAMETER Before Power- IH Down V Fall Time PF(MAX) PF(MIN) V Rise Time ...
Page 15
AC TEST CONDITIONS Output Load: 50pF + 1TTL Gate Input Pulse Levels 3.0V Timing Measurement Reference Levels: Input: 1.5V Output: 1.5V Input Pulse Rise and Fall Times: 5ns NOTES: 1) Voltages are referenced to ground. 2) Typical values ...
Page 16
... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time 2010 Maxim Integrated Products DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs DESCRIPTION Maxim and the Dallas logo are registered trademarks of Maxim Integrated Products. PAGES CHANGED ...