[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

From: AndreasClaudius . Vogel
Subject: Re: [avr-gcc-list] How Hot does a 62256-15 SRAM Get?
Date: Mon, 12 Sep 2005 12:03:01 +0200

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...

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

09.09.2005 17:15

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.


AVR-GCC-list mailing list

reply via email to

[Prev in Thread] Current Thread [Next in Thread]