atf750c-15xc ATMEL Corporation, atf750c-15xc Datasheet - Page 4

• Manufacturer Part Number: atf750c-15xc
• Description: Atf750c High-speed Complex Programmable Logic Device
• Manufacturer: ATMEL Corporation

Bus-friendly Pin-
keeper Input and I/Os
Input Diagram
I/O Diagram
4
ATF750C(L)
All input and I/O pins on the ATF750C(L) have programmable “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 resistors 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.
DATA
INPUT
OE
PROTECTION
V
CIRCUIT
CC
ESD
V
CC
100K
PROGRAMMABLE
PROGRAMMABLE
OPTION
OPTION
100K
V
CC
I/O
0776K–PLD–07/07