12197-508-XTD ON Semiconductor, 12197-508-XTD Datasheet - Page 10

• Manufacturer Part Number: 12197-508-XTD
• Manufacturer: ON Semiconductor

Specifications of 12197-508-XTD

• Data Rate: 1.171875Kbps
• Power Supply Type: Analog/Digital
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Pin Count: 28
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Internal Oscillator Option
crystal or ceramic resonator. A parallel resonant ceramic
resonator can be connected between XIN and XOUT.
Figure 12 illustrates the crystal option for clock generation
using a 460.8 kHz (±1 % tolerance) parallel resonant crystal
and two tuning capacitors Cx. The actual values of the
capacitors may depend on the recommendations of the
manufacturer of the resonator. Typically, capacitors in the
range of 100 pF to 470 pF are used.
External Clock Option
shown in Figure 13 rather than the internal oscillator. In
addition, the A5191HRT consumes less current when an
external clock is used. Minimum current consumption
occurs with the clock connected to XOUT and XIN
connected to V
The oscillator cell will function with either a 460.8 kHz
It may be desirable to use an external 460.8 kHz clock as
XOUT
C
X
Figure 12. Crystal Oscillator
Oscillator
SS
460.8 kHz
Crystal
.
XIN
C
X
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10
Power On Reset
the voltage level on V
= 2.5 V to guarantee correct operation of the digital circuitry.
As illustrated in Figure 14 RESETB should be kept low for
at least t
During start-up the RESETB pin should be kept low until
V
RESET pin
DDH
460.8 kHz
= 2.5 V
Figure 13. Oscillator with External Clock
VDD
POR
Figure 14. Power On Reset Timing
= 10 ns after this threshold level is reached.
XOUT
DD
is above the minimum level V
Oscillator
Crystal
t
POR
= 10 ns
XIN
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PC20101013.2
t
DDH