atf750lvc ATMEL Corporation, atf750lvc Datasheet - Page 3

• Manufacturer Part Number: atf750lvc
• Description: Atf750lvc High-speed Complex Programmable Logic Device
• Manufacturer: ATMEL Corporation

Clock Mux
Output Options
Bus-friendly Pin-keeper Input and I/Os
All input and I/O pins on the ATF750LVC(L) have program-
mable “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 cause unnec-
essary 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.
Table 1. Software Compiler Mode Selection
ATF750LVC (PPK)
ATF750LVC
Synario
V750CPPK
Wincupl
V750C
Pin-keeper Circuit
PRODUCT
Disabled
Enabled
CLOCK
TERM
CKi
CLK
PIN
CKMUX
SELECT
Input Diagram
I/O Diagram
DATA
OE
INPUT
LOGIC
CELL
TO
PROTECTION
V
CIRCUIT
CC
ESD
V
CC
100K
PROGRAMMABLE
PROGRAMMABLE
OPTION
OPTION
100K
V
CC
I/O
3