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TheTTL - Al Kossow's Bitsavers

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TBP38SA165, TBP38SA166, TBP38SA16X<br />

16,384·8IT· (2048 WORDS BY 8 BITS) STANDARD<br />

PROGRAMMABLE READ·ONLY MEMORY WITH OPEN·COLLECTOR OUTPUTS<br />

AOTOA10J<br />

Vee<br />

G<br />

01<br />

02<br />

07<br />

I<br />

I<br />

I<br />

VALID ADDRESS<br />

:<br />

C<br />

~tw1 ~tw2 I4--tt-tw3 ~tw1<br />

I I I I I I ------ 12.SV<br />

I<br />

~ j+-th(enl<br />

----- SV<br />

OV<br />

I<br />

I I<br />

r. 1 L VOH<br />

VOL<br />

I :<br />

I I - VOH<br />

I<br />

PROGRAM 02<br />

~ ~<br />

I<br />

I<br />

~<br />

I<br />

I<br />

I I I<br />

IzPR~RAMQ7<br />

VOL<br />

VOH<br />

L VOL<br />

Illustrated above is the following sequence:<br />

11 It is desired to program the selected address with 01100001 (00-07). Only outputs 01, 02 and 07 need programming.<br />

21 01 is verified to be at a low logic level and then the programming sequence is executed. The output is then verified to be at a high<br />

logic level.<br />

3) 02 is an example of an output requiring three attempts to be programmed successfully.<br />

4) 07 is programmed to a high logic level.<br />

FIGURE 1. SERIES 3 PROGRAMMING SEQUENCE<br />

U3<br />

~<br />

o<br />

a:<br />

c..<br />

TEXAS -1!1<br />

INSTRUMENTS<br />

POST OFFICE BOX 225012 • DALLAS. TEXAS 75265<br />

4-99

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