MC145574 Datasheet

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Freescale Semiconductor, Inc.

of power, the MC145574 should be reset. This pin is a Schmitt鈥搕rigger input and could have an external

RC circuit connected to perform the power鈥搊n reset function.

7.3

7.3.1

ADDITIONAL NOTES

Input Levels

The MC145574 S/T transceiver is always TTL/CMOS level compatible on all digital input pins.

7.3.2

Output Levels

The MC145574 is always CMOS level compatible on all digital output pins.

7.3.3

SCP HIDOM

The MC145574 S/T transceiver has the capability of forcing all outputs (both analog and digital) to

the high鈥搃mpedance state. This feature, known as the 鈥渟erial control port high鈥搃mpedance digital output

mode鈥?is provided to allow 鈥渋n鈥揷ircuit鈥?testing of other circuits or devices resident on the same PCB

without requiring the removal of the MC145574.

The SCP HIDOM mode is entered by holding SCPEN low for a minimum of 33 consecutive rising

edges of the SCPCLK while SCP Rx is high. If SCPEN goes high or if SCP Rx goes low, the device

exits the SCP HIDOM mode and returns to normal operation.

Freescale Semiconductor, Inc...

MOTOROLA

MC145574

For More Information On This Product,

Go to: www.freescale.com

7鈥?

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