At 09:45 PM 27/05/99 -0400, you wrote:
I am using 24LC256 from Microchip. I use 8 of them and they have a 1uA
standby current. I am using them in a data logging application to give me 2
megabits. However, I have access to power and am using a 16C74 as I have a
lot of other functions to take care of (LCD, 4x4 keypad, RTC, RS232 link,
alarms, radio link)

good luck


Peter Grey

>Hi Folks,
>
>I'm new to the PIC list and am back into PIC development mode after an
absence
>of a few years.
>
>I'm working on a data logging application using a PIC16F84. I need a
>low-power design with a large memory. These loggers may be recording for
>several years under battery power before being interrogated.
>
>Currently, I'm looking at a couple of 8 megabit serial flash memory
>devices: the NexFlash NX25F080A and the ATMEL AT45DB081. Both operate at
>2.7 volts, have a 4-wire serial interface and dual SRAM sector buffers
>on-chip. This is important because it allows sectors to be assembled
>on-chip before being programmed into FLASH. This style of memory requires
>an entire sector to be written at once, and there is not enough RAM in a
>PIC to hold the data.
>
>The ATMEL part looks a little more flexible, since both sector buffers can
>be programmed directly to FLASH. The NexFlash part has separate PROGRAM and
>SRAM buffers; although data can be copied between the two, only the PROGRAM
>buffer can be written to FLASH. However, the decider for me is the power
>consumption. At 2 uA standby, the ATMEL part requires twice the power of
>the NexFlash part (1 uA).
>
>Does anyone have any experience (positive or negative) with either of these
>parts? Are there any other devices that I should consider using?
>
>Thanks,
>- Stewart Greenhill
>