
PRODUCT SPECIFICATION
RC7105
7
Functional Description
Output Drivers
The RC7105 uses CMOS type output buffers which drive
the output rail-to-rail (GND to VDD) into typical capacitive
loads. Because of this the outputs are both TTL and CMOS
level compatible. Nominal output buffer impedance is 15
.
Operation
The RC7105 is programmed by writing ten bytes of eight
bits each. See Table 1 for byte sequence.
Table 1. Byte Writing Sequence
Byte
Sequence
1
Byte Name
Slave Address
Bit Sequence
11010010
Byte Description
Commands the RC7105 to accept the bits in Data Bytes 0-6 for
internal register configuration. Since other devices may exist on
the same common serial data bus, it is necessary to have a
specific slave address for each potential receiver. The slave
receiver address for the RC7105 is 11010010. Register setting
will not be made if the Slave Address is not correct (or is for an
alternate slave receiver).
Unused by the RC7105, therefore bit values are ignored (don’t
care). This byte must be included in the data write sequence to
maintain proper byte allocation. The Command Code Byte is
part of the standard serial communication protocol and may be
used when writing ot another addressed slave receiver on the
serial data bus.
Unused by the RC7105, therefore bit values are ignored (don’ t
care). This byte must be included in the data write sequence to
maintain proper byte allocation. The Byte Count Byte is part of
the standard serial communication protocol and may be used
when writing to another addressed slave receiver on the serial
data bus.
The data bits in these bytes set internal RC7105 registers that
control device operation. The data bits are only accepted when
the Address Byte bit sequence is 11010010, as noted above.
For description of bit control functions, refer to Table 2, Data
Byte Serial Configuration Map.
Refer to Fairchild clock drivers.
2
Command
Code
Don’t Care
3
Byte Count
Don’t Care
4
5
6
Data Byte 0
Data Byte 1
Data Byte 2
Refer to Table 2
7
8
9
10
Data Byte 3
Data Byte 4
Data Byte 5
Data Byte 6
Don’t Care