DS1554-100 DALLAS [Dallas Semiconductor], DS1554-100 Datasheet
DS1554-100
Related parts for DS1554-100
DS1554-100 Summary of contents
Page 1
... DQ7 10 DQ6 11 DQ5 12 DQ4 13 DQ3 14 DQ2 15 DQ1 X1 GND V 16 DQ0 17 GND 34-Pin POWERCAP MODULE BOARD (USES DS9034PCX POWERCAP PRELIMINARY DS1554 IRQ/ A13 A11 A10 DQ7 20 DQ6 19 DQ5 18 DQ4 ...
Page 2
... RAM. User access to all registers within the DS1554 is accomplished with a bytewide interface as shown in Figure 1. The RTC Registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format ...
Page 3
... The DS1554 power-on reset can be used to detect a system power down or failure and hold the CPU in a safe reset state until normal power returns and stabilizes; the for this function ...
Page 4
... If the address inputs are changed while AA will remain valid for output data hold time (t access. DATA WRITE MODE The DS1554 is in the write mode whenever referenced to the latter occurring transition of the cycle. and must return inactive for a minimum read or write cycle ...
Page 5
... The DS1554 has a lithium power source that is designed to provide energy for the clock activity, and clock and RAM data retention when the V supply is sufficient to power the DS1554 continuously for the life of the equipment in which it is installed. For specification purposes, the life expectancy is 10 years with the internal clock oscillator running in the absence of V lithium energy source disconnected, guaranteeing full energy capacity ...
Page 6
... The MSB of the Seconds Register (B7 of 7FF9h). Setting stops the oscillator, setting starts the oscillator. The DS1554 is shipped from Dallas Semiconductor with the clock oscillator turned off, bit set ...
Page 7
... The alarm can be programmed to activate on a specific day of the month or repeat every day, hour, minute, or second. It can also be programmed to go off while the DS1554 is in the battery backed state of operation to serve as a system wake-up. Alarm mask bits AM1-AM4 control the alarm mode. Table 3 shows the possible settings ...
Page 8
... ALARM RATE 1 Once per second 0 When seconds match 0 When minutes and seconds match 0 When hours, minutes, and seconds match 0 When date, hours, minutes, and seconds match is fulfilled. The alarm flag is also cleared by a read DS1554 /FT pin. The /FT IRQ IRQ ...
Page 9
... Register is cleared. If the watchdog function is set to output to the function is activated, the watchdog function prevails and the frequency test function is denied. /FT output when the watchdog times out. IRQ /FT will go low if an alarm IRQ output for a duration of RST /FT output and the frequency test IRQ DS1554 ...
Page 10
... OL2 V 4. TYP MAX UNITS V +0. +0. 0.8 0.6 = 5.0V =10 TYP MAX UNITS 0.4 V 0.4 V 4.37 4. BAT DS1554 NOTES NOTES ...
Page 11
... MIN CC1 IH I CC2 2 OL1 V OL2 V 2. (0°C to 70° 3.3V ± 10%) CC TYP MAX UNITS 0 0 0.4 V 0.4 V 2.88 2. BAT V PF DS1554 NOTES ...
Page 12
... CEA t 40 CEZ t 5 OEL t 100 OEA t 35 OEZ 5.0V 10%) CC MIN MAX UNITS NOTES 100 ns 100 100 3.3V 10%) CC MIN MAX UNITS NOTES 150 ns 150 150 130 DS1554 ...
Page 13
... WEZ 5.0V 10%) CC MIN MAX UNITS NOTES 100 3.3V 10%) CC MIN MAX UNITS NOTES 150 130 ns 140 DS1554 ...
Page 14
... WRITE CYCLE TIMING, WRITE ENABLE CONTROLLED Figure 6 WRITE CYCLE TIMING, CHIP ENABLE CONTROLLED Figure DS1554 ...
Page 15
... V to High RST PF Expected Data Retention Time (Oscillator On) POWER-UP/DOWN WAVEFORM TIMING 5-VOLT DEVICE Figure SYMBOL MIN TYP 300 REC DS1554 = 5.0V 10%) CC MAX UNITS NOTES 200 ms years 6, 7 ...
Page 16
... Capacitance on /FT, IRQ RST and DQ pins SYMBOL MIN 300 REC SYMBOL MIN 3.3V 10%) CC TYP MAX UNITS 200 ms years (T TYP MAX UNITS DS1554 NOTES NOTES 1 1 ...
Page 17
... IRQ RST 6. Data retention time Each DS1554 has a built-in switch that disconnects the lithium source until V user. The expected t is defined for DIP modules and PowerCap modules as a cumulative time in DR the absence of V starting from the time power is first applied by the user ...
Page 18
... DS1554 32-PIN PACKAGE PKG 32-PIN DIM MIN A IN. 1.670 38. IN. 0.715 MM 18.16 0.335 C IN. 8. IN. 0.075 MM 1.91 0.015 E IN. 0. IN. 0.140 MM 3.56 0.090 G IN. MM 2.29 H IN. 0.590 14. IN. 0.010 MM 0.25 K IN. 0.015 MM 0. DS1554 MAX 1.690 38.93 0.740 18.80 0.365 9.27 0.105 0.67 0.030 0.76 0.180 4.57 0.110 2.79 0.630 16.00 0.018 0.45 0.025 ...
Page 19
... PKG DIM MIN A 0.920 B 0.980 - C D 0.052 E 0.048 0.015 F G 0.025 DS1554 INCHES NOM MAX 0.925 0.930 0.985 0.990 - 0.080 0.055 0.058 0.050 0.052 0.020 0.025 0.027 0.030 ...
Page 20
... DS1554P WITH DS9034PCX ATTACHED PKG DIM MIN 0.920 A B 0.955 C 0.240 0.052 D E 0.048 F 0.015 0.020 DS1554 INCHES NOM MAX 0.925 0.930 0.960 0.965 0.245 0.250 0.055 0.058 0.050 0.052 0.020 0.025 0.025 0.030 ...
Page 21
... RECOMMENDED POWERCAP MODULE LAND PATTERN PKG DIM MIN DS1554 INCHES NOM MAX - 1.050 - - 0.826 - - 0.050 - - 0.030 - - 0.112 - ...