ATF750C ATMEL [ATMEL Corporation], ATF750C Datasheet - Page 4

• Manufacturer Part Number: ATF750C
• Description: High-speed Complex Programmable Logic Device
• Manufacturer: ATMEL [ATMEL Corporation]

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
Table 1. Software Compiler Mode Selection
Input Diagram
I/O Diagram
4
ATF750C (PPK)
ATF750C
Synario
ATF750C(L)
DATA
INPUT
OE
PROTECTION
V
CIRCUIT
CC
ESD
V750CPPK
WINCUPL
V750C
V
CC
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.
100K
PROGRAMMABLE
PROGRAMMABLE
OPTION
OPTION
100K
V
CC
I/O
Pin-keeper Circuit
Disabled
Enabled