ATF1504BE-7AU44 Atmel, ATF1504BE-7AU44 Datasheet - Page 8

• Manufacturer Part Number: ATF1504BE-7AU44
• Description: IC CPLD 64MC 1.8V 44-TQFP
• Manufacturer: Atmel
• Series: ATF1504BEr

Specifications of ATF1504BE-7AU44

• Programmable Type: In System Programmable (min 10K program/erase cycles)
• Delay Time Tpd(1) Max: 7.5ns
• Voltage Supply - Internal: 1.7 V ~ 1.9 V
• Number Of Macrocells: 64
• Number Of I /o: 32
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Features: CMOS/TTL Compatible
• Voltage: 1.8V
• Memory Type: CMOS
• For Use With: ATF15XX-DK3 - KIT DEV FOR ATF15XX CPLD'S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Logic Elements/cells: -

2. Input and I/O Pins
2.1
8
Programmable Pin-keeper Option for Inputs and I/Os
ATF1504BE
The ATF1504BE offers the option of individually programming each of its input or I/O pin so that
pin-keeper circuit can be utilized. 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 undriven input and
I/O lines from floating to intermediate voltage levels, which causes unnecessary power con-
sumption and system noise. The keeper circuits eliminate the need for external pull-up resistors
and eliminate their DC power consumption.
Figure 2-1
I/O pin. The pin-keeper circuit is a weak feedback latch and has an effective resistance that is
approximately 50 kΩ.
Figure 2-1.
Figure 2-2.
shows the pin-keeper circuit for an Input Pin and
Input with Programmable Pin-keeper
I/O with Programmable Pin-keeper
V
CCIO
V
CCINT
50K
50K
Figure 2-2
V
CCINT
shows the same for an
3637B–PLD–1/08