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参数资料
| 型号： | RV5C348B |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | XO, clock |
| 英文描述： | 4-WIRE SERIAL INTERFACE |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO10 |
| 封装： | 4 X 2.90 MM, 1.20 MM HEIGHT, 0.50 MM PITCH, SSOP-10 |
| 文件页数： | 32/45页 |
| 文件大小： | 1276K |
| 代理商： | RV5C348B |
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Rx5C348A/B
Connection of /INTR and 32KOUT Pin
The /INTR pin follows the N-channel open drain output logic and contains no protective diode on the power
supply side.
As such, it can be connected to a pull-up resistor of up to 5.5v regardless of supply voltage.
The 32KOUT pin follows the N-channel open drain output logic, too. However, it contains protective diode on the
power supply side.
As such, it cannot be connected to a pull-up resistor over VDD+0.3v.
Such connection
involves considerations for the supply current requirements of a pull-up resistor, which can be roughly calculated
by the following equation:
I = 0.5
× (VDD or VCC) / Rp
VSB
OSCIN
OSCOUT
/INTR or 32KOUT
*1)
32768Hz
B
A
Backup power supply
(VCC)
System power supply
(VDD)
VSS
*1) Depending on whether the /INTR or 32KOUT
pins are to be used during battery backup, it
should be connected to a pull-up resistor at
the following different positions:
(1) Position A in the left diagram when it is not to
be used during battery backup.
(2) Position B in the left diagram when it is to be
used during battery backup.
Connection of CE Pin
Connection of the CE pin requires the following considerations:
1) The CE pin is configured to enable the oscillation halt sensing circuit only when driven low.
As such, it
should be driven low or open at power-on from 0v.
2) The CE pin should also be driven low or open immediately upon the host going down (see "P.25
I/O
CONTROL
SO
SCLK
CE
SI
CE
Min.0
s
VDD
Lower limit operating
voltage for the CPU
Min.0
sMin.0s
0.2
×VDD
Backup power supply
12345
Rev.2.01
- 38 -
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相关代理商/技术参数 |
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| RV5C386A | 制造商:RICOH 制造商全称:RICOH electronics devices division 功能描述:I2C-bus Real-Time Clock ICs with Voltage Monitoring Function |
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