ATF1502BE-7AU44 Atmel, ATF1502BE-7AU44 Datasheet - Page 6

• Manufacturer Part Number: ATF1502BE-7AU44
• Description: IC CPLD EE HP 7NS 44TQFP
• Manufacturer: Atmel
• Series: ATF1502BEr

Specifications of ATF1502BE-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: 32
• 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: EEPROM
• 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. Programmable Pin-keeper Option for Inputs and I/Os
6
ATF1502BE
The ATF1502BE offers the option of 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 unused input and I/O lines from
floating to intermediate voltage levels, which causes unnecessary power consumption and sys-
tem 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
50K
Figure 2-2
50K
shows the same for an
3492A–PLD–12/05