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參數(shù)資料
| 型號： | RS5C321B |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | ULTRA-COMPACT SERIAL REAL-TIME CLOCK ICs WITH 32.768kHz |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.65 MM PITCH, SSOP-8 |
| 文件頁數(shù)： | 7/33頁 |
| 文件大?。?/td> | 252K |
| 代理商： | RS5C321B |
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RS5C321A/B
3
Pin No.
1
2
3
5
7
6
8
4
PIN DESCRIPTIONS
Symbol
CE
SCLK
(RS5C321A)
SCLK
(RS5C321B)
SIO
32KOUT
OSCIN
OSCOUT
VDD
VSS
Name
Chip enable input
Serial clock input
Serial input/output
32.768kHz clock
output
Oscillator circuit
input/output
Positive/Negative
power supply input
Description
The CE pin is used to interface the CPU and is accessible when held at the high
level. This pin is connected to a pull-down resistor. It should be switched to the
low level or opened when not accessed or when powering off the system.
This pin is used to input shift clock pulses to synchronize data input to, and output
from, the SIO pin. SCLK and SCLK are for writing data at falling and rising edge of
clock pulses respectively and also reading data at rising and falling edge of clock
pulses respectively.
The SIO pin inputs and outputs written or read data in synchronization with shift
clock pulses from the SCLK/SCLK pin. The SIO pin causes high impedance when
CE pin is held at the low level (CMOS input/output). After the CE pin is switched
to the high level and the control bits and the address bits are input from the SIO,
the SIO pin performs serial input and output operations.
The 32KOUT pin outputs 32.768kHz clock pulses when activated. This pin func-
tions as an Nch open drain output.
These pins configure an oscillator circuit by connecting a 32.768kHz crystal oscilla-
tor between the OSCIN and OSCOUT pins and by connecting a capacitor between
the OSCIN and Vss pins. (Any other oscillator circuit components are built into
the RS5C321A/B.)
The VDD pin and V
SS
pin are connected to the positive power supply and to the
ground level respectively.
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