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8 Mbit Firmware Hub
A Microchip Technology Company
SST49LF008A
Data Sheet
Electrical Specifications
The AC and DC specifications for the FWH Interface signals (FWH[3:0], CLK, FWH4, and RST#) as
defined in Section 4.2.2 of the PCI Local Bus Specification, Rev. 2.1 . Refer to Table 12 for the DC voltage
and current specifications. Refer to the tables on pages 24 through 29 for the AC timing specifications for
Clock, Read/Write, and Reset operations.
Absolute Maximum Stress Ratings (Applied conditions greater than those listed under “Absolute
Maximum Stress Ratings” may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these conditions or conditions greater than those defined in the
operational sections of this data sheet is not implied. Exposure to absolute maximum stress rating con-
ditions may affect device reliability.)
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
Storage Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
D. C. Voltage on Any Pin to Ground Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to V DD +0.5V
Transient Voltage (<20 ns) on Any Pin to Ground Potential 1 . . . . . . . . . . . . . . . . . -2.0V to V DD +2.0V
Package Power Dissipation Capability (T A =25°C). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0W
Surface Mount Solder Reflow Temperature 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Output Short Circuit Current 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
1. Do not violate processor or chipset limitations on the INIT# pin.
2. Excluding certain with-Pb 32-PLCC units, all packages are 260 ° C capable in both non-Pb and with-Pb solder versions.
Certain with-Pb 32-PLCC package types are capable of 240 ° C for 10 seconds; please consult the factory for the latest
information.
3. Outputs shorted for no more than one second. No more than one output shorted at a time. This note applies to non-PCI
outputs.
Table 10: Operating Range
Range
Commercial
Ambient Temp
0°C to +85°C
V DD
3.0-3.6V
T10.1 25085
Table 11: AC Conditions of Test 1,2
Input Rise/Fall Time
3ns
Output Load
C L = 30 pF
T11.1 25085
1. See Figures 23 and 24
2. FWH interface signals use PCI load test conditions
?2011 Silicon Storage Technology, Inc.
22
DS25085A
10/11
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