looking for dip-32 1MB eeprom

[norill]

hey, i need to find some dip-32 electrically erasable memory that is at least 8Mbit (1MB). can you recommend some websites that list IC models and specifications? i want to replace HN62328BP (8Mbit mask rom), but the biggest eeproms i could find are only 4Mbit. everything bigger i find is either uv eprom or otp eprom also it has to be compatible with TL866 programmer (list of compatible ICs: http://autoelectric.cn/MiniPro/MiniProSupportList.txt)

[krzysiobal]

There is no such thing.
Proof:
A0..A19 = 20
D0..D7 = 8
GND + VCC = 2
!WE + !OE + !CS = 3
Total pin count: 33

In UV EPROMS the !WE and !OE is integrated in one pin so tat 0/5V is levels for !OE and when applied VPP (12.5V) it acts as a write strobe, so there exists DIP32 8 MBIT EPROM (27C080), but not FLASH.

[norill]

There is no such thing.

i'm starting to think you might be right. but it's strange that they make uv eproms like that, but no eeproms i think i'll just get a smaller one or an uv eprom. anyway, thanks for your reply. szczęśliwego nowego roku

[tokumaru]

it's strange that they make uv eproms like that, but no eeproms

It's not strange, the reason is explained in krzysiobal's post: UV EPROMs can combine 2 pins into 1 because they work with 2 voltages, 5V for reading and 12.5V for writing. Electrically erasable chips always use 5V, so they really do need a dedicated pin for programming.

[tepples]

A memory designed for a 6502-style bus could generate /OE internally by inverting /WE, assuming that /CE is enough to select it.