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参数资料
| 型号： | RTC-7301SFB |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 24/28页 |
| 文件大小： | 274K |
| 代理商： | RTC-7301SFB |
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RTC - 7301 SF / DG
Page - 2
MQ332-05
3. Terminal connections
RTC - 7301 SF
1.
/ CS0
24. VDD
2.
FCON
23. (VDD)
3.
FOUT
22. (VDD)
4.
VTEP
21. (VDD)
5.
(VDD)
20. (VDD)
6.
/ IRQ
19. (VDD)
7.
A0
18. CS1
8.
A1
17. D0
9.
A2
16. D1
10.
A3
15. D2
11.
/ RD
14. D3
12.
GND
# 1
#12
#24
#13
13. / WR
SSOP - 24 pin
RTC - 7301 DG
1.
/ CS0
18.
VDD
2.
FOUT
17.
(VDD)
3.
/ IRQ
16.
(VDD)
4.
A0
15.
CS1
5.
A1
14.
D0
6.
A2
13.
D1
7.
A3
12.
D2
8.
/ RD
11.
D3
9.
GND
# 1
# 9
#18
#10
10.
/ WR
DIP - 18 pin
4. Terminal functions
Pin number
Pin
name 7301SF
24pin
7301DG
18pin
I/O
Functions
/CS0
1
Input
This is a chip select 0 input pin and has a built-in pull-up resistor.
When /CS0="L",CS1="H," access of this device is possible.
FCON
2
-
Input
This pin is only on the RTC7301SF.
It selects the frequency to output to the
FOUT pin.
This pin is fixed at 32.768 kHz output when FCON="L" and frequencies are
selectable by the FD bit when FCON="H."
Note: This pin is not found on RTC-7301DG.
It is fixed at “H” internally.
Therefore, because FDOUT output frequencies are selected by the FD bit, set the FD bit and FE bit
to the appropriate setting when the frequency is output to the FOUT pin.
FOUT
3
2
Output
This outputs the clock signal at the frequency set by the FD bit (CMOS output).
Furthermore, output is 32.768 kHz when FCON="L."
When there is no FOUT output, this pin is set to high impedance.
VTEMP
4
-
Output
This is a temperature sensor output pin found only on RTC7301SF. (Analog
voltage output)
When there is no VTEMP output, this pin is set to high impedance.
/IRQ
6
3
Output
This is an N-ch open-drain interrupt output pin.
A0 to A3
7 to 10
4 to 7
Input
These are address input pins.
When accessing this device, this pin inputs the register address to select.
/RD
11
8
Input
This is a read strobe input pin.
Data can be read from RTC when /RD="L."
GND
12
9
-
This pin is connected to the ground.
/WR
13
10
Input
This is a write strobe input pin.
This pin writes data to the RTC at edge of the rise.
D0 to D3 14 to 17 11 to 14
I/O
These are data I/O pins.
CS1
18
15
Input
This is a chip select 1 input pin and has a built-in pull-down resistor.
It is possible for the FOUT pin to output when CS1=”H,” regardless of the status
of the /CS0 pin.
The FOUT pin is set to high impedance when CS1="L."
( VDD ) 5, 19 - 23
16,17
-
These pins have the same electrical potential as VDD, but,
do not connect
them to any external equipment.
VDD
24
18
-
Connect this to a + power supply.
Note 1 ) Be sure to connect a filter capacity of at least 0.1
F close to VDD - GND.
Note 2 ) When the /RD and /WR pins are both in the "L" state, mis-operations can occur.
Avoid this state.
Relationship of FOUT output and RTC access by the /CS0, CS1 and FCON pins and the FE bit
/ CS0
CS1
FCON
FE
FOUT output
RTC access
L
Χ
High impedance
Not possible
H
L
Χ
32.768 kHz output
Not possible
H
0
High impedance
Not possible
H
1
FD bit selectable frequency output
Not possible
L
H
L
Χ
32.768 kHz output
Possible
L
H
0
High impedance
Possible
L
H
1
FD bit selectable frequency output
Possible
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