Designing in Split Power Supply Support for AT94KAL/AX and AT94SAL/AX Devices Features Introduction Programmable SLI AT94K/AT94S Series The AT94K Field Programmable System Level Integrated Circuit (FPSLICTM) and the AT94S Secure FPSLIC exists in two different power families, the AL and AX. The AL Family is a 3.3-volt device on a 0.35 process, while the AX Family is a 1.8-volt device on a 0.18 process. The primary difference between the two families, aside from the process, is that the AX device requires a split power supply. Application Note * Outlines AT94K/AT94S Power Supply Setup Required for the AX Device * Explains the Difference between Core and I/O Voltages * Provides Pin Locations for the AT94KAX/AT94SAX Split Power Supply Description On the AL device, both the FPSLIC core and FPSLIC I/Os are powered from a single 3.3V supply. Furthermore, the AL device also supports 5V-tolerant I/Os due to the thick oxide coating being used. However, on the AX device a split power supply provides separate supplies for the FPSLIC core and FPSLIC I/Os. On the AX device, VDD is 1.8V, powering the FPSLIC core, while VCC is 3.3V, which powers the 3.3V-tolerant I/Os. The split power supply became necessary on the AX device because the AX FPSLIC core operates at a much lower voltage then the FPSLIC I/O. On the target system both voltages must be supplied. There is no voltage regulator within the FPSLIC device to implement the split power. This becomes important for customers who are currently designing with the AT94KAL/AT94SAL Family with intentions of migrating designs to the AT94KAX/AT94SAX Family. This application note provides the VDD and VCC pin locations (see Table 1 and Figure 1 through Figure 5) for the AT94KAX/AT94SAX Family for the PC84, VQ100, TQ144, PQ208 and BG256 packages. Rev. 2308B-11/01 1 Table 1. AT94KAX/AT94SAX Split Power Supply Pin Locations Package VCC VDD PC84 11, 33, 54, 74 2, 22, 42, 63 VQ100 25, 51, 75, 100 12, 37, 63, 89 TQ144 37, 73, 108, 144 18, 54, 90, 128 PQ208 55, 106, 154, 205 26, 78, 130, 183 BG256 B2, G8, G13, H10, T3, K13, L3, M10, R14, T7 D14, E7, F12, G3, H9, K10, L13, M13, P4, T9 2 VCC VDD 2 74 VCC 63 VDD 54 VCC 33 42 VDD 22 VCC VDD 11 Figure 1. AT94KAX-PC84 Split Power Supply Diagram Split Power Supply for AT94K/AT94S Series Devices 2308B-11/01 Split Power Supply for AT94K/AT94S Series Devices VCC VDD 89 25 37 VDD 12 VCC VDD 100 Figure 2. AT94KAX-VQ100 Split Power Supply Diagram 75 VCC 63 VDD 51 VCC 108 VCC 90 VDD 73 VCC VCC VDD 128 37 54 VDD 18 VCC VDD 144 Figure 3. AT94KAX-TQ144 Split Power Supply Diagram 3 2308B-11/01 VDD VCC VDD 205 183 Figure 4. AT94KAX-PQ208 Split Power Supply Diagram 26 154 VCC 130 VDD VDD VCC 55 78 106 VCC Figure 5. AT94SAX-BG256 Split Power Supply Diagram VDD VCC 4 Split Power Supply for AT94K/AT94S Series Devices 2308B-11/01 Atmel Headquarters Atmel Product Operations Corporate Headquarters Atmel Colorado Springs 2325 Orchard Parkway San Jose, CA 95131 TEL (408) 441-0311 FAX (408) 487-2600 Europe Atmel SarL Route des Arsenaux 41 Casa Postale 80 CH-1705 Fribourg Switzerland TEL (41) 26-426-5555 FAX (41) 26-426-5500 Asia Atmel Asia, Ltd. Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 Japan Atmel Japan K.K. 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 1150 E. Cheyenne Mtn. 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Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. Atmel (R) is the registered trademark of Atmel; FPSLICTM is the trademark of Atmel. Other terms and product names may be trademarks of others. Printed on recycled paper. 2308B-11/01/xM