TL16PNP550A Datasheet, PDF (37/40 Pages) Texas Instruments – ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH PLUG-AND-PLAY (PnP) AND AUTOFLOW CONTROL

TL16PNP550A
ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH PLUG-AND-PLAY (PnP) AND AUTOFLOW CONTROL
SLLS190B – MARCH 1995 – REVISED MARCH 1996
PRINCIPLES OF OPERATION
programmable baud generator (continued)
Table 19. Baud Rates Using a 22-MHz Crystal
and a Prescalar Divisor of 12
DESIRED
BAUD RATE
50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200
38400
56000
DIVISOR USED
TO GENERATE
16 × CLOCK
2304
1536
1047
857
768
384
192
96
64
58
48
32
24
16
12
6
3
2
PERCENT ERROR
DIFFERENCE BETWEEN
DESIRED AND ACTUAL
0.026
0.058
0.69
2.86
Driver
External
XIN
Clock
Optional
Clock
Output
Optional
Driver
XOUT
VCC
C1
RP
Oscillator Clock
to Prescalar Logic
C2
XIN
Crystal
RX2
XOUT
VCC
Oscillator Clock
to Prescalar Logic
CRYSTAL
22 MHz
TYPICAL CRYSTAL OSCILLATOR NETWORK
RP
1 MΩ
RX2
1.5 kΩ
C1
10 – 30 pF
C2
40 – 60 pF
Figure 20. Typical Clock Circuits
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