[sdiy] 2532 EEPROMs

[ChristianH]

This is how I remember the Texas Instruments 4kx8 EPROM mess:

Intel had a 2732, single supply.
TI had a 2732, triple supply (those apparantly appeared more or less at
the same time, otherwise they probably wouldn't have used the same number)

Soon TI recognized that nobody fancied triple supplies anymore, so they
made a 2532 with single supply (the 5 indicating 5 Volts operation), but
slightly different pinout (as Tom depicted). Probably dropping their
unloved triple 2732 at the same time.

And finally, TI decided to do what everybody else did - making a single
supply 2732 with the standard pinout.

So IIRC, there were two different parts by TI called 2732 (maybe with
something like an innocent A suffix?)

Christian



On Thu, 12 Feb 2004 09:33:03 -0600 Tom McClintock wrote:

> Actually, the 2532 and a 2732 are identical in nature, aside from a
> slightly different pinout. The 2532 was TI's directly upgradable path
> for the 2716, but no other manufacturers followed it and instead used
> the Intel 2732 pinout. The 2532 uses pin 21 as A11, keeping pin 20 and
> 18 as CS and PD. The TMS2716 was the triple supply EPROM. However, all
> EPROM programers should be able to handle these. The 2708 is the one
> EPROM many programmers won't touch. Given enough time, you could easily
> modify the PCB to accept a 2732 in place of a 2532, or just make an
> adapter board.
> 
> 
> tm
> 
> ----------------------------
> name:         2532
> function:     EPROM
> package:      24 pin DIL,24
> manufacturer: many
> added-by:     Corey Stup
> 
>     +--()--+
>  A7 | 1  24| Vcc
>  A6 | 2  23| A8
>  A5 | 3  22| A9
>  A4 | 4  21| Vpp
>  A3 | 5  20| /E, /Progr
>  A2 | 6  19| A10
>  A1 | 7  18| A11
>  A0 | 8  17| D7
>  D0 | 9  16| D6
>  D1 |10  15| D5
>  D2 |11  14| D4
> Vss |12  13| D3
>     +------+
> 
> 
> 
> --------------------------------
> name:         2732
> function:     4kx8 EPROM
> package:      DIL,24
> manufacturer: Intel, Toshiba, Texas, ST...
> added-by:     Marko Virkkula
> 
>     +--()--+
>  A7 | 1  24| VCC
>  A6 | 2  23| A8
>  A5 | 3  22| A9
>  A4 | 4  21| A11
>  A3 | 5  20| /OE VPP
>  A2 | 6  19| A10
>  A1 | 7  18| /CE
>  A0 | 8  17| D7
>  D0 | 9  16| D6
>  D1 |10  15| D5
>  D2 |11  14| D4
> GND |12  13| D3
>     +------+
>