Baud Rate Generator
STANDARD MICROSYSTEMS CORPORATION
COM 8046 cOM8046T
Baud Rate Generator
Programmable Divider
FEATURES
o On chip cryst...
Description
STANDARD MICROSYSTEMS CORPORATION
COM 8046 cOM8046T
Baud Rate Generator
Programmable Divider
FEATURES
o On chip crystal oscillator or external frequency input
o Single + 5v power supply o Choice of 32 output frequencies o 32 asynchronousl synchronous baud rates o Direct UARTIUSRTI ASTRO/USYNRT
compatibility
ORe-programmable ROM via CLASp® technology allows generation of other frequencies
o TTL, MOS compatible
o 1X Clock via fol 16 output o Crystal frequency output via fx and fxl 4
outputs
o Output disable via FENA
PIN CONFIGURATION
XTALlEXT1 1 I XTALlEXT2 2
+5v 3 fx 4
GND 51 fo/16 61
FENA 71
E 81
\..J
)16 fo 15 A 14 B 13 C 12 D 11 ST 10 fx/4 9 NC
ST~--'
A B C D E
BLOCK DIAGRAM
REPROGRAM MABLE FREQUENCY SELECT
DIVIDER ROM
I
XTALlEXT1 XTALlEXT2
DIVIDER
FENA~------------------------------4------------------------------------------------------------------~----------~
A ,l
+5v GND
10 10/16
fx fx/4
179
General Description
The Standard Microsystems COM 8046 is an enhanced version of the COM 5046 Baud Rate Generator. It is fabricated using SMC's patented COPLAMOS® and CLASp® technologies and employs depletion mode loads, allowing operation ·from a single +5v supply.
The standard COM 8046 is specifically dedicated to generating the full spectrum of 16 asynchronousl synchronous data communication frequencies for 1X, 16X and 32X UARTI USRTI ASTRal USYNRT devices.
The COM 8046 features an internal crystal oscillator which may be used to provide the master reference frequ...
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