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ATF750C(L)

Bus-friendly Pin-keeper Input and I/Os

All input and I/O pins on the ATF750C(L) have programma-

ble “pin-keeper” circuits. If activated, when any pin is driven

high or low and then subsequently left floating, it will stay at

that previous high or low level.

This circuitry prevents unused input and I/O lines from

floating to intermediate voltage levels, which causes

unnecessary power consumption and system noise. The

keeper circuits eliminate the need for external pull-up resis-

tors and eliminate their DC power consumption.

Enabling or disabling of the pin-keeper circuits is controlled

by the device type chosen in the logic compiler device

selection menu. Please refer to the software compiler table

for more details. Once the pin-keeper circuits are disabled,

normal termination procedures are required for unused

inputs and I/Os.

Input Diagram

I/O Diagram

Table 1. Software Compiler Mode Selection

Synario WINCUPL Pin-keeper Circuit

ATF750C V750C Disabled

ATF750C (PPK) V750CPPK Enabled

100K

ESD

PROTECTION

CIRCUIT

INPUT

PROGRAMMABLE

OPTION

100K

DATA

I/O

PROGRAMMABLE

OPTION

1 2 3 4 5 6 7 8 9 ... 15 16

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Rainbow-electronics ATF750CL Manual de usuario Pagina 4