The Cross Reference shows nothing for that part #.
Entering 1044 brings up Zener Diodes.
Anyone know if they supply charge pumps?
NTE 9944 ?? It came up under a Mouser search. NTE lists it, but has no data sheet?
BTW, NTE has it's cross-reference data available to download as a program. NTE Quick-Cross v11.0. Handy for cross-checking when you're off-line for whatever reason. :)
There is no NTE sub, or ANY 100% identical sub from any other manufacturer, for that matter. It's a proprietary Maxim chip. You can use a 7660 (see Geofex article) but then you have to be careful how to wire and route things.
Maybe LTC1044 from Linear Technology. I know Linear definitely have a whole family of charge pumps, some will definitely meet/exceed specs for MAX1044.