Re: [avr-gcc-list] How Hot does a 62256-15 SRAM Get?

[AndreasClaudius . Vogel]

OK, lets have some maths....
0.1A*5V are 0.5W.
Lets say Duty Cycle is about 20% (62.5ns
AVR vs. 12 ns RAM) -> 0.2*0.5W = 0.1 W
Thermal Resistance Junction to ambient?
 Lets say 50K/W -> 50*0.1=5 degree Celsius ABOVE ambient temperature....
seems like nothing.
Calculate with your values out of the
datasheet...
Andreas

User Tomdean <address@hidden>
Sent by: address@hidden

09.09.2005 17:15

To	address@hidden
cc	address@hidden
Subject	Re: [avr-gcc-list] How Hot does a 62256-15 SRAM Get?

I purchased the part from Jameco.  I wanted the
NS62256H-15NC, Jameco
shows ATT7C199P-15.  .  The part I receied was UM61m256K-15,
with a
fancy 'm'.  The data sheet is for an AS7C256(5v)/

>From the data sheet, Max operating current is 115 ma.
Standby is 4 ma.

I do not have the exact datasheet for this part.  I can find lots
of
places to buy it, but, no none seems to have the data sheet.

>From the replies, seems like I will have little or no problem.

I have a 2.3x3.4 inch pad-per-hole PCB and need an ATmega16, a 16mHz
Xtal, 74ahc373, 62256, a 50-pin, dual row header, and, the Packet
Whacker.  The Atmega16 will be half under the Packet Whacker.  The
6256 will be all under.  I am mounting all the IC's in sockets.

tomdean


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