March 2004

11

M9999-033004

MIC2563A

Micrel

Component Key

U1 .................... MIC2563

U2, U3 ............. 74x175

U4 .................... 74x574

Serial Control

Figure 6 shows conversion from a three-wire serial interface,

such as used by the Cirrus Logic CL-PD6730, to the standard

eight-line parallel interface used by the MIC2563A-1. This

interface requires three common, low cost 7400-series logic

ICs:

• 74x574 Octal D Flip-Flop

• 74x175 Quad Flip-Flop with Latches (two needed)

Either 3.3V or 5V logic devices may be used, depending upon

the control voltage employed by the slot logic controller. Pin

numbers in parenthesis refer to the MIC2563A-1BSM. Gerber

files for this PC board layout are available to Micrel custom-

ers. Please contact Micrel directly.

Another serial-to-parallel solution for this application is the

74HC594, 8-bit shift register with output registers. This de-

vice contains the eight D flip-flops plus has latched outputs

suitable for this purpose.

Serial Control Adapter PC Board Layout