1
Designing in Split Power Supply Support for
AT94KAL/AX and AT94SAL/AX Devices
Features
•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
Introduction
The AT94K Field Programmable System Level Integrated Circuit (FPSLIC™) 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 0.35µ process, while the AX Family is a 1.8-volt device
on a 0.18µ process. The primary difference between the two families, aside from the
process, is that the AX device requires a 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 pro-
vides 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 inten-
tions 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.
Programmable
SLI
AT94K/AT94S
Series
Application
Note
Rev. 2308B–11/01
2Split Power Supply for AT94K/AT94S Series Devices
2308B–11/01
Figure 1. AT94KAX-PC84 Split Power Supply Diagram
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
11
22
VDD
74 VCC
63 VDD
54 VCC
VCC
VDD
42
33
VCC
VDD
3
Split Power Supply for AT94K/AT94S Series Devices
2308B–11/01
Figure 2. AT94KAX-VQ100 Split Power Supply Diagram
Figure 3. AT94KAX-TQ144 Split Power Supply Diagram
VDD
VCC
VDD
VCC
VDD
VCC
VCC
VDD
100
89
75
63
51
37
25
12
VCC
144
VDD
128
VCC
108
VDD
90
VCC73
VCC
37
VDD
54
VDD 18
4Split Power Supply for AT94K/AT94S Series Devices
2308B–11/01
Figure 4. AT94KAX-PQ208 Split Power Supply Diagram
Figure 5. AT94SAX-BG256 Split Power Supply Diagram
VCC
205
VDD
183
VCC
154
VDD130
VCC
106
VDD 26
VCC
55
VDD
78
VDD
VCC
© Atmel Corporation 2001.
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 Headquarters Atmel Product Operations
Corporate Headquarters
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
Atmel Colorado Springs
1150 E. Cheyenne Mtn. Blvd.
Colorado Springs, CO 80906
TEL (719) 576-3300
FAX (719) 540-1759
Atmel Grenoble
Avenue de Rochepleine
BP 123
38521 Saint-Egreve Cedex, France
TEL (33) 4-7658-3000
FAX (33) 4-7658-3480
Atmel Heilbronn
Theresienstrasse 2
POB 3535
D-74025 Heilbronn, Germany
TEL (49) 71 31 67 25 94
FAX (49) 71 31 67 24 23
Atmel Nantes
La Chantrerie
BP 70602
44306 Nantes Cedex 3, France
TEL (33) 0 2 40 18 18 18
FAX (33) 0 2 40 18 19 60
Atmel Rousset
Zone Industrielle
13106 Rousset Cedex, France
TEL (33) 4-4253-6000
FAX (33) 4-4253-6001
Atmel Smart Card ICs
Scottish Enterprise Technology Park
East Kilbride, Scotland G75 0QR
TEL (44) 1355-357-000
FAX (44) 1355-242-743
Atmel Programmable SLI Hotline
(408) 436-4119
Atmel Programmable SLI e-mail
fpslic@atmel.com
FAQ
Available on web site
e-mail
literature@atmel.com
Web Site
http://www.atmel.com
Printed on recycled paper.
2308B–11/01/xM
Atmel® is the registered trademark of Atmel; FPSLIC™ is the trademark of Atmel.
Other terms and product names may be trademarks of others.
