DS1500 Maxim, DS1500 Datasheet - Page 5

• Manufacturer Part Number: DS1500
• Description: The DS1500 is a full-function, year 2000-compliant, real-time clock/calendar (RTC) with an alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of on-board nonvolatile (NV) SRAM, NV control for backing up an external SRAM, and a 32
• Manufacturer: Maxim

Figure 2. Write Cycle Timing, Write-Enable-Controlled
Figure 3. Write Cycle Timing, Chip-Select-Controlled
DQ0-DQ7
WE
CS
A0-A4
DQ0-DQ7
WE
A0-A4
CS
DATA OUTPUT
t
AS
t
AS
t
AS
t
AS
VALID
VALID
t
WEZ
t
WC
t
WC
t
t
CSW
WEW
t
5 of 20
DS
DATA INPUT
DATA INPUT
t
t
AH
DH
t
t
AH
DH
t
WR
t
WR
VALID
DATA INPUT
VALID
DATA INPUT