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BQ3285S- Datasheet

  • BQ3285S-

  • Real-Time Clock RTC

  • 22頁(yè)

  • TI

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bq3285
Real-Time Clock (RTC)
Features
廬
Direct clock/calendar replace-
ment for IBM
廬
AT-compatible
computers and other applications
廬
Functionally compatible with the
DS1285
廬
Calendar in day of the week, day
of the month, months, and years,
with automatic leap-year adjust-
ment
廬
Time of day in seconds, minutes,
and hours
General Description
The CMOS bq3285 is a low-power
microprocessor peripheral providing
a time-of-day clock and 100-year cal-
endar with alarm features and bat-
tery operation. Other features in-
clude three maskable interrupt
sources, square wave output, and 114
bytes of general nonvolatile storage.
The bq3285 write-protects the clock,
calendar, and storage registers during
power failure. A backup battery
then maintains data and operates the
clock and calendar.
The bq3285 is a fully compatible
real-time clock for IBM AT com-
patible computers and other appli-
cations. The only external compo-
nents are a 32.768kHz crystal and
a backup battery
-
Closely matches MC146818A
pin configuration
-
-
12- or 24-hour format
Optional daylight saving
adjustment
廬
114 bytes of general nonvolatile
storage
廬
160ns cycle time allows fast bus
operation
廬
Selectable Intel or Motorola bus
timing
廬
Less than 0.5碌A(chǔ) load under bat-
tery operation
廬
14 bytes for clock/calendar and
control
廬
BCD or binary format for clock
and calendar data
廬
Programmable square wave out-
put
廬
Three individually maskable in-
terrupt event flags:
-
-
-
Periodic rates from 122碌s to
500ms
Time-of-day alarm once per
second to once per day
End-of-clock update cycle
廬
24-pin plastic DIP or SOIC
Pin Connections
Pin Names
AD
0
鈥揂D
7
Multiplexed address/data
input/output
Bus type select input
Chip select input
Address strobe input
Data strobe input
Read/write input
Interrupt request
output
Reset input
Square wave output
RAM clear input
3V backup cell input
Crystal inputs
No connect
+5V supply
Ground
MOT
CS
AS
DS
RCL
BC
INT
RST
DS
VSS
R/ W
MOT
X1
X2
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
VSS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
SQW
NC
RCL
BC
INT
RST
DS
VSS
R/W
AS
CS
12
13
14
15
16
17
18
AD0
AD1
AD2
AD3
AD4
AD5
NC
5
6
7
8
9
10
11
4
3
2
1
28
27
26
X2
X1
MOT
NC
VCC
SQW
NC
25
24
23
22
21
20
19
R/W
INT
RST
SQW
RCL
BC
X1鈥揦2
AD6
NC
AD7
VSS
CS
AS
NC
28-Pin PLCC
24-Pin DIP or SOIC
PN328501.eps
PN328501.eps
NC
V
CC
V
SS
Jan. 1999 E
1

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