|OnSemi (formerly Motorola) make a pin
compatible part that is substantially cheaper than the
The JLC1562B facilitates easy I2C Bus expandibility. Multiple
devices (up to 8 on the same I2C Bus) are easily added as each
device has its own selectable 3-bit address. The JLC1562B
provides an 8-bit bidirectional input/output port and 6-bit
resolution Digital to Analog Converter. The device can also be
used as an Analog to Digital Converter with 5 input signal lines
each with 6-bit A/D resolution. The voltage on pins P0-P4 is
compared with a controllable threshold voltage and the results
are readable through the I2C Bus.
I2C Bus interface pins SDA, SCL and A0-A2 are; Serial Data, Serial Clock and Device Address respectively. External interface pins are P0-P7 and VDAC; I/O Port and D/A output.
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If you are using the surface mount parts beware:
PCF8574's are 0.3" wide packages. (normal 74XXX's are in 0.15" wide packages)
JLC1562 is in different 0.2" wide package.
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