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M48T86 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. M48T86
Description  5V PC REAL TIME CLOCK
Download  23 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M48T86 Datasheet(HTML) 4 Page - STMicroelectronics

 
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M48T86
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DS (Data Strobe Input). The DS pin is also re-
ferred to as Read (RD). A falling edge transition on
the Data Strobe (DS) input enables the output dur-
ing a a read cycle. This is very similar to an Output
Enable (G) signal on other memory devices.
E (Chip Enable Input). The
Chip
Enable
pin
must be asserted low for a bus cycle in the
M48T86 to be accessed. Bus cycles which take
place without asserting E will latch the addresses
present, but no data access will occur.
Figure 4. Block Diagram
AI01643
OSCILLATOR
BCD/BINARY
INCREMENT
E
/ 8
/ 64
/ 64
PERIODIC INTERRUPT/SQUARE WAVE SELECTOR
SQUARE WAVE
OUTPUT
POWER
SWITCH
AND
WRITE
PROTECT
AD0-AD7
REGISTERS A,B,C,D
CLOCK CALENDAR,
AND ALARM RAM
STORAGE
REGISTERS
(114 BYTES)
CLOCK/
CALENDAR
UPDATE
BUS
INTERFACE
VCC
VBAT
VCC
POK
DS
R/W
AS
SQW
RST
IRQ
DOUBLE
BUFFERED
RCL
IRQ (Interrupt Request Output). The IRQ pin is
an open drain output that can be used as an inter-
rupt input to a processor. The IRQ output remains
low as long as the status bit causing the interrupt
is present and the corresponding interrupt-enable
bit is set. IRQ returns to a high impedance state
whenever Register C is read. The RST pin can
also be used to clear pending interrupts. Because
the IRQ bus is an open drain output, it requires an
external pull-up resistor to VCC.


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