DS1747W-120+ Maxim Integrated Products, DS1747W-120+ Datasheet
DS1747W-120+
Specifications of DS1747W-120+
Related parts for DS1747W-120+
DS1747W-120+ Summary of contents
Page 1
Rev 9/10 www.maxim-ic.com FEATURES Integrated NV SRAM, Real-Time Clock (RTC), 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 EDIP PowerCap ...
Page 3
... PIN-PACKAGE TOP MARK 32 EDIP (0.740a) DS1747-70+ 32 EDIP (0.740a) DS1747-70IND+ 34 PowerCap* DS1747P+70 34 PowerCap* DS1747P+70 IND 32 EDIP (0.740a) DS1747W-120+ 32 EDIP (0.740a) DS1747W-120IND+ 34 PowerCap* DS1747WP+120 34 PowerCap* DS1747WP+120 IND supply out-of- CC † ...
Page 4
Figure 1. Block Diagram PACKAGES The DS1747 is available in two packages (32-pin DIP and 34-pin PowerCap module). The 32-pin DIP style module integrates the crystal, lithium energy source, and silicon all in one package. The 34-pin PowerCap Module Board ...
Page 5
Table 1. Truth Table > <V < <V < SETTING THE CLOCK As shown in Table ...
Page 6
Table 2. Register Map ADDRESS B7 B6 7FFFF 10 Year 7FFFE X X 7FFFD X X 7FFFC BF FT 7FFFB X X 7FFFA X OSC 7FFF9 10 Seconds 7FFF8 W R OSC = Stop Bit R = Read Bit W ...
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 failing point internal clock registers and SRAM are blocked from any access. At ...
Page 8
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground……………………………………………………………..-0.3V to +6.0V Operating Temperature Range (Noncondensing) Commercial...……………………………………….......................................................................0°C to +70°C Industrial……………………………………………………..……………………………………….-40°C to +85°C Storage Temperature Range EDIP .......................………………………………………………………………………………...-40°C to +85°C PowerCap ........................................................................................................................... -55°C to +125°C Lead Temperature (soldering, 10s)..........................……………………….………….…………………………...+260°C Note: ...
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 Access Time CE Data Off Time Low-Z OE ...
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 DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs ...
Page 13
POWER-UP/DOWN AC CHARACTERISTICS (5V) = 5.0V 10 Over the Operating Range PARAMETER Before Power-Down V Fall Time PF(MAX) V PF(MIN) V Fall Time ...
Page 14
POWER-UP/DOWN CHARACTERISTICS (3.3V) = 3.3V 10 Over the Operating Range PARAMETER Before H Power-Down V Fall Time PF(MAX) V PF(MIN) V Rise Time ...
Page 15
AC TEST CONDITIONS Output Load 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 ...
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 DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs DESCRIPTION Maxim and the Dallas logo are registered trademarks of Maxim Integrated Products. PAGES CHANGED ...