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TheTTL - Al Kossow's Bitsavers

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TBP38S165, TBP38S166, TBP38S16X<br />

16,384-BIT (2048 WORDS BY 8 BITS) STANDARD<br />

PROGRAMMABLE READ-ONLY MEMORY WITH 3-STATE OUTPUTS<br />

AOTO A10J VALID ADDRESS<br />

:<br />

Vee<br />

G<br />

I !4-I1-tw1 ~tw2 I4--tt-tw3<br />

, ,<br />

I , ,<br />

I<br />

,t<br />

It<br />

01<br />

,<br />

I'<br />

I<br />

02 I<br />

I<br />

07 I<br />

I<br />

~ j4-th(enl<br />

I<br />

I<br />

1<br />

I<br />

I<br />

~<br />

I<br />

x=<br />

I4"*-tw1<br />

,<br />

I<br />

------ 12.5V<br />

PROGRAM 02<br />

~ } ~ ~I<br />

PROGRAM 07<br />

I<br />

-----5V<br />

OV<br />

- VOH<br />

L VOL<br />

L<br />

- VOH<br />

VOL<br />

VOH<br />

VOL<br />

Illustrated above is the following sequence:<br />

1) It is desired to program the selected address with 01100001 (00-071. 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 />

31 02 is an example of an output requiring three attempts to be programmed successfully.<br />

41 07 is programmed to a high logic level.<br />

FIGURE 1. SERIES 3 PROGRAMMING SEQUENCE<br />

4-92<br />

TEXAS.<br />

INSTRUMENTS<br />

POST OFFICE BOX 225012 • DALLAS. TEXAS 75265

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