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X1243S8T1 参数 Datasheet PDF下载

X1243S8T1图片预览
型号: X1243S8T1
PDF下载: 下载PDF文件 查看货源
内容描述: [Real Time Clock, 0 Timer(s), CMOS, PDSO8, PLASTIC, SOIC-8]
分类和应用: 时钟光电二极管外围集成电路
文件页数/大小: 18 页 / 285 K
品牌: XICOR [ XICOR INC. ]
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X1243 – Preliminary Information  
PIN CONFIGURATION  
quartz crystal is used. Recommended crystal is a Citizen  
CFS-206. The crystal supplies a timebase for a clock/  
oscillator. The internal clock can be driven by an  
external signal on X1, with X2 left unconnected.  
X1243  
8-Pin SOIC  
1
2
V
V
X1  
X2  
8
7
6
5
CC  
Figure 1. Recommended Crystal Connection  
Back  
IRQ  
3
4
SCL  
SDA  
12pF  
V
SS  
X1  
X2  
10M  
X1243  
8-Pin TSSOP  
360K  
68pF  
V
SCL  
Back  
1
2
8
7
6
5
V
SDA  
CC  
X1  
X2  
V
SS  
POWER CONTROL OPERATION  
3
4
IRQ  
The Power control circuit accepts a V  
and a V  
CC  
BACK  
BACK  
input. The power control circuit will switch to V  
when V < V  
PIN DESCRIPTIONS  
Serial Clock (SCL)  
– 0.2V. It will switch back to V  
CC  
BACK  
CC  
when V exceeds V  
.
CC  
BACK  
Figure 2. Power Control  
The SCL input is used to clock all data into and out of  
the device. The input buffer on this pin is always active  
(not gated).  
V
CC  
Internal  
Voltage  
V
BACK  
Serial Data (SDA)  
V
= V  
-0.2V  
BACK  
CC  
SDA is a bidirectional pin used to transfer data into and  
out of the device. It has an open drain output and may  
be wire ORed with other open drain or open collector  
outputs.The input buffer is always active (not gated).  
REAL TIME CLOCK OPERATION  
An open drain output requires the use of a pull-up  
resistor. The output circuitry controls the fall time of the  
output signal with the use of a slope controlled pull-  
down. The circuit is designed for 400kHz 2-wire inter-  
face speeds.  
The Real Time Clock (RTC) uses an external, 32.768kHz  
quartz crystal to maintain an accurate internal repre-  
sentation of the year, month, day, date, hour, minute,  
and seconds. The RTC has leap-year correction and a  
century byte. The clock will also correct for months hav-  
ing fewer than 31 days and will have a bit that controls  
24-hour or AM/PM format. When the X1243 powers up  
V
BACK  
This input provides a backup supply voltage to the  
after the loss of both V  
and V  
, the clock will not  
device. V  
supplies power to the device in the  
CC  
BACK  
BACK  
increment until at least one byte is written to the clock  
register.  
event the V supply fails.  
CC  
Interrupt Output—IRQ  
Reading the Real Time Clock  
This is an interrupt signal output. This signal notifies a  
host processor that alarm has occurred and requests  
action. It is an open drain active LOW output.  
The RTC is read by initiating a Read command and  
specifying the address corresponding to the register of  
the Real Time Clock. The RTC Registers can then be  
read in a Sequential Read Mode. Since the clock runs  
continuously and a read takes a finite amount of time,  
there is the possibility that the clock could change dur-  
ing the course of a read operation. In this device, the  
time is latched by the read command (falling edge of  
X1, X2  
The X1 and X2 pins are the input and output,  
respectively, of an inverting amplifier that can be con-  
figured for use as an on-chip oscillator. A 32.768kHz  
Characteristics subject to change without notice. 2 of 18  
REV 1.1.4 5/31/01  
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