One of the prominent members of Spartan-3A FPGA family is XC3S50AN-4TQG144I. It is a commercial device which can in a versatile temperature range starting from 0°C to 100°C. The XC3S50AN-4TQG144I device comes up with a -4 standard performance speed grade having 144 pins. It is a high performing commercial only device. These devices have gained popularity due to their lower cost and extremely high and efficient performance. One of the notable feature of XC3S50AN-4TQG144I device is presence of SelectRAM™ which is capale of hierarchical memory architecture. SelectRAM™ is a fast block RAM having speed of up to 576 Kbits also equipped with 176 Kbits of distributed RAM. Pack type of XC3S50AN-4TQG144I devices is Thin Quad Flat Pack which also known as TQFP. These devices are capable of reducing system power due to presence of hibernate and suspend modes. Multiple voltage and multiple standard interface pins are present in these devices. The XC3S50AN-4TQG144I devices are equipped with QUIETIO mode as a built-in feature which enables these devices in reduction of switching noise. These devices come up with hot swap compliance and are completely compatible with 3.3V with upper and lower tolerance range set as +/- 10%. Built in Double Distribution RAM (also called the DDR) is present in these devices which enable them to transfer data up to 640 Mb/s. In contrast to other devices in FPGA-3A Spartan family, XC3S50AN-4TQG144I contains only one column of block RAM containing dedicated multiplier. The devices of this Spartan family come with 2 Digital Clock Meters which are mounted on the top.
Fine pitch Ball Grid Array is the prominent feature of XC3S50AN-4TQG144C devices which is also known as FPGA. These devices comes up with 50K system gates containing 1,584 logic equivalent cells. These devices consist of programmable logic array of 16 rows and 12 columns with 176 CLBs (one CLB is equal to 4 slices thus making 704 total slices). XC3S50AN-4TQG144C devices contain 11,000 distributed RAM bits with 54,000 bits of blocked RAM. This family have three dedicated multipliers and comes with design containing 2 Digital Clock Managers also known as DCMs. The two Digital Clock Managers are mounted on the top. User I/O pairs 0f 108 and 50 differential I/O pairs are also present in XC3S50AN-4TQG144C. This family of Spartan-3A FPGA contains 144 Pins and comes up with Thin Quad Flat Pack. These devices can operate really well in diverse temperature range of -40°C to 100°C.
Settings of Clock to Output timings in XC3S50AN-4TQG144C range between 3.18 ns to 3.42 ns when DCM is in use at fast slew rate. Similarly, Output only timing settings of these devices are set between 4.59 ns to 5.02 ns with no usage of Digital Clock Meter at fast slew rate.
For IOB input path, Pin to Pin steup times for these devices vary between 2.45 ns to 2.68 ns when Digital Clock Manager is in use with no programmed input delay. On the other hand, when no Digital Clock Manager is in use coupled with programmed input delay, the Pin to Pin setup times of XC3S50AN-4TQG144C devices ranges between 2.55 ns to 2.76 ns.