Datasheet Details
| Part number | DS1557 |
|---|---|
| Manufacturer | Dallas Semiconducotr |
| File Size | 249.40 KB |
| Description | 4MEG NV Y2KC Timekeeping RAM |
| Datasheet |
 DS1557 Datasheet
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General Description
A0
A18
- Address Input
DQ0
DQ7 IRQ/FT
- Data Input/Outputs - Interrupt, Frequency Test
Output (Open Drain)
RST
- Power-On Reset Output
(Open Drain)
CE
- Chip Enable
OE
- Output Enable
WE
- Write Enable
VCC GND
- Power-Supply Input - Ground
X1, X2
- Crystal Connectio
Key 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 Reside in the 16 Top RAM Locations.
- Century Byte Register (i. e. , Y2K Compliant).
- 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.