鈥?/div>
Three
interrupts are separately software-maskable
and testable
鈥?Time-of-day alarm once/second to once/day
鈥?Periodic rates from 122
碌s
to 500 ms
鈥?End of clock update cycle
19
11
12 13 14 15 16 17 18
AD6
AD7
GND
NC
NC
CS
AS
DS1285Q 28-PIN PLCC
鈥?/div>
Optional 28-pin PLCC surface mount package
DESCRIPTION
The DS1285 Real Time Chip is a direct replacement for
the MC146818A in IBM AT computer clock/calendar
and other applications. For a complete description of
operating conditions, electrical and mechanical charac-
teristics, bus timing, and pin descriptions see the
DS12885 data sheet.
PIN DESCRIPTION
AD0-AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
SQW
V
CC
GND
X1,X2
V
BAT
RCLR
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Multiplexed Address/Data Bus
No Connection
Bus Type Selection
Chip Select
Address Strobe
Read/Write Input
Data Strobe
Reset Input
Interrupt Request Output (open drain)
Square Wave Output
+5 Volt Supply
Ground
32.768 KHz Crystal Connections
+3 Volt Battery Input
RAM Clear
050898 1/1
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