DS1746-120 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated
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DS1746-120 Datasheet PDF : 18 Pages
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PIN DESCRIPTION
A0–A16 – Address Input
CE
– Chip Enable
OE
– Output Enable
WE
VCC
GND
DQ0–DQ7
NC
– Write Enable
– Power Supply Input
– Ground
– Data Input/Output
– No Connection
RST
X1, X2
VBAT
– Power–on Reset Output (Power–
Cap Module board only)
– Crystal Connection
– Battery Connection
DS1746/DS1746P
ORDERING INFORMATION
DS1746P (5V)
blank 32-pin DIP Module
P
34-pin PowerCap Module board*
DS1746WP (3.3V)
blank 32-pin DIP Module
P 34-pin PowerCap Module board*
*DS9034PCX (PowerCap) Required:
(must be ordered separately)
DESCRIPTION
The DS1746 is a full function, year 2000 compliant (Y2KC), real-time clock/calendar (RTC) and 128k x
8 non-volatile static RAM. User access to all registers within the DS1746 is accomplished with a
bytewide interface as shown in Figure 1. The Real Time Clock (RTC) information and control bits reside
in the eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours,
minutes, and seconds data in 24-hour BCD format. Corrections for the date of each month and leap year
are made automatically. The RTC clock registers are double buffered to avoid access of incorrect data
that can occur during clock update cycles. The double buffered system also prevents time loss as the
timekeeping countdown continues unabated by access to time register data. The DS1746 also contains its
own power-fail circuitry which deselects the device when the VCC supply is in an out of tolerance
condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC
as errant access and update cycles are avoided.
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