Rainbow-electronics DS1554 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Hardware de computador Rainbow-electronics DS1554. Rainbow Electronics DS1554 User Manual Manual do Utilizador

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1 of 20 022101
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
16 top RAM locations
Century byte register; i.e., Y2K complaint
Totally nonvolatile with over 10 years of
operation in the absence of power
Precision power-on reset
Programmable watchdog timer and RTC
alarm
BCD coded year, month, date, day, hours,
minutes, and seconds with automatic leap
year compensation valid up to the year 2100
Battery voltage level indicator flag
Power-fail write protection allows for ±10%
V
CC
power supply tolerance
Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
PIN ASSIGNMENT
DS1554
256K NV Y2KC Timekeeping RAM
www.dalsemi.com
1
IRQ/FT
2
3
NC
NC
RST
V
CC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
4
5
6
7
8
9
10
11
12
13
14
15
16
17
NC
A
14
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A
13
A
12
A
11
A
10
A
9
A
8
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
34
NC
X1 GND
V
BAT
X2
34-Pin PowerCap
®
Module Board
(Uses DS9034PCX PowerCap)
RST
13
1
2
3
4
5
6
7
8
9
10
11
12
14
31
A14
A7
A5
A4
A3
A2
A1
A0
DQ1
DQ0
V
CC
NC
IRQ/FT
WE
A
13
A
8
A
9
A
11
OE
A
10
CE
DQ7
DQ5
DQ6
32
30
29
28
27
26
25
24
23
22
21
19
20
NC
A12
A6
DQ2
GND
15
16
18
17
DQ4
DQ3
32-Pin Encapsulated Package
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Resumo do Conteúdo

Página 1 - 256K NV Y2KC Timekeeping RAM

1 of 20 022101FEATURES Integrated NV SRAM, real time clock,crystal, power-fail control circuit and lithiumenergy source Clock registers are access

Página 2 - DESCRIPTION

DS155410 of 20ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground -.3V to +6.0VStorage Temperature -55°C to +125°CSoldering Temperature

Página 3 - DS1554 BLOCK DIAGRAM Figure 1

DS155411 of 20DC ELECTRICAL CHARACTERISTICS(Over the Operating Range; VCC=3.3V ±10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESActive Supply Current ICC1

Página 4 - DATA RETENTION MODE

DS155412 of 20READ CYCLE, AC CHARACTERISTICS (Over the Operating Range)VCC=5.0V ±±±±10% VCC=3.3V ±±±±10%PARAMETER SYMBOLMIN MAX MIN MAXUNITS NOTESRea

Página 5 - CLOCK OPERATIONS

DS155413 of 20WRITE CYCLE TIMING, WRITE ENABLE CONTROLLED Figure 6WRITE CYCLE TIMING, CHIP ENABLE CONTROLLED Figure 7

Página 6 - READING THE CLOCK

DS155414 of 20POWER-UP/DOWN CHARACTERISTICS(Over the Operating Range; VCC=5.0V ±10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCE or WE at VIH , Befor

Página 7 - USING THE CLOCK ALARM

DS155415 of 20POWER-UP/DOWN CHARACTERISTICS (Over the Operating Range; VCC=3.3V ±10%)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCE or WE at VIH , Bef

Página 8 - ALARM MASK BITS Table 3

DS155416 of 20AC TEST CONDITIONSOutput Load: 100 pF + 1TTL GateInput Pulse Levels: 0.0 to 3.0VTiming Measurement Reference Levels:Input: 1.5VOutput:

Página 9 - POWER-ON DEFAULT STATES

DS155417 of 20DS1554 32-PIN PACKAGEPKG 32-PINDIM MIN MAXA IN.MM1.67038.421.69038.93B IN.MM0.71518.160.74018.80C IN.MM0.3358.510.3659.27D IN.MM0.0751.9

Página 10 - IRQ /FT and RST

DS155418 of 20DS1554PNOTE:Dallas Semiconductor recommends that PowerCap Module bases experience one pass through solderreflow oriented with the label

Página 11 - =3.3V ±10%)

DS155419 of 20DS1554P WITH DS9034PCX ATTACHEDPKG INCHESDIM MIN NOM MAXA0.920 0.925 0.930B0.955 0.960 0.965C0.240 0.245 0.250D0.052 0.055 0.058E0.048 0

Página 12

DS15542 of 20ORDERING INFORMATIONDS1554 5V; 32-pin DIP ModuleDS1554P 5V; 34-pin PowerCap Module board*DS1554W 3.3V; 32-pin DIP ModuleDS1554WP 3.3V; 34

Página 13 - 13 of 20

DS155420 of 20RECOMMENDED POWERCAP MODULE LAND PATTERNINCHESPKGDIMMIN NOM MAXA- 1.050 -B- 0.826 -C- 0.050 -D- 0.030 -E- 0.112 -

Página 14 - =5.0V ±10%)

DS15543 of 20The DS1554 also contains its own power-fail circuitry, which automatically deselects the device when theVCC supply enters an out of toler

Página 15 - IRQ /FT, RST

DS15544 of 20DATA READ MODEThe DS1554 is in the read mode whenever CE (chip enable) is low and WE (write enable) is high. Thedevice architecture al

Página 16 - AC TEST CONDITIONS

DS15545 of 20BATTERY LONGEVITYThe DS1554 has a lithium power source that is designed to provide energy for the clock activity, andclock and RAM data r

Página 17 - DS1554 32-PIN PACKAGE

DS15546 of 20DS1554 REGISTER MAP Table 2DATAADDRESSB7B6B5B4B3B2B1B0FUNCTION/RANGE7FFFh 10 Year YEAR YEAR 00-997FFEh X X X 10 M MONTH MONTH 01-127FFDh

Página 18 - 18 of 20

DS15547 of 20SETTING THE CLOCKThe 8th bit, B7 of the Control Register is the write bit. Setting the write bit to a 1, like the read bit, haltsupdates

Página 19 - 19 of 20

DS15548 of 20ALARM MASK BITS Table 3AM4 AM3 AM2 AM1 ALARM RATE1111Once per second1110When seconds match1100When minutes and seconds match1000When hour

Página 20 - 20 of 20

DS15549 of 20The IRQ /FT pin can also be activated in the battery backed mode. The IRQ /FT will go low if an alarmoccurs and both ABE and AE are set

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