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PDF DS1254 Data sheet ( Hoja de datos )
| Número de pieza | DS1254 | |
| Descripción | 2M x 8 NV SRAM with Phantom Clock | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1254
2M x 8 NV SRAM with Phantom Clock
www.maxim-ic.com
FEATURES
§ Real-time clock (RTC) keeps track of hundredths
of seconds, seconds, minutes, hours, days, date,
months, and years with automatic leap-year
compensation valid up to the year 2100
§ 2M x 8 NV SRAM
§ Watch function is transparent to RAM operation
§ Automatic data protection during power loss
§ Unlimited write-cycle endurance
§ Surface-mountable BGA module construction
§ Over 10 years of data retention in the absence of
power
§ Battery monitor checks remaining capacity daily
§ +3.3V or +5V operation
PACKAGE OUTLINE
Side -A- Shown
(For Reference Only, Not to Scale)
Component placement may vary.
ORDERING INFORMATION
APPLICATIONS
Telecom Switches
Routers
RAID Systems
TYPICAL OPERATING CIRCUIT
PART
DataSheet4U.cDoSm1254WB-
150
DS1254YB-
100
DS1254WB2-
150
DS1254YB2-
100
PIN-
PACKAGE
BGA, 3.3V
BGA, 5V
BGA, 3.3V
BGA, 5V
TEMP
RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
TOP
MARK
DS1254W-
150
DS1254Y-
100
DS1254W2-
150
DS1254Y2-
100
DataShee
PIN DESCRIPTION
VCC
A0–A20
- Supply Voltage
- Address Inputs
DQ0–DQ7 - Data I/O
CE - Chip-Enable Input
OE - Output-Enable Input
WE - Write-Enable Input
BW - Battery Warning Output
(Open Drain)
GND
- Ground
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
DataSheemt4aUy b.ceosmimultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 082203
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Figure 3. Phantom Clock Register Definition
DS1254
et4U.com
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DS1254
Figure 6. Memory Write Cycle Timing, Chip-Enable Controlled (Notes 5, 7, 8, 10, 11, 12,
and 13)
ADDRESS
tWC
tAW tWP
tAH2
CE
WE
tCOE
tODW
DQ0–DQ7
tDS tDH2
DATA IN
STABLE
et4U.com Figure 7. Read Cycle to Phantom Clock
DataSheet4U.com
WE = VIH
CE
OE
DQ0
tRC
tCO
tOE
tCOE
tCOE
tRR
tOD
tOD
OUTPUT
DATA VALID
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11 of 17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet DS1254.PDF ] | |
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