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TheTTL - Al Kossow's Bitsavers

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TBP34R162, TBP34R16X<br />

16,384-BIT (4096 WORDS BY 4 BITS) REGISTERED<br />

PROGRAMMABLE READ-ONLY MEMORY<br />

series 3 programming sequence<br />

AOTO<strong>Al</strong>l ==x<br />

I<br />

Vee<br />

I<br />

I I<br />

VALID ADDRESS<br />

G<br />

~::<br />

I I<br />

I I<br />

I I<br />

01 "'----......:.--------------4IJ'""-.:......-~I-----. - VOH<br />

H<br />

I LVOL<br />

I I I<br />

02 I I<br />

I<br />

I I ! L VOH<br />

03<br />

--~------------------------------------------~I---4/~~;:<br />

I I I<br />

lVERIFY<br />

Z<br />

II<br />

PROGRAM 01<br />

~ VERIFY<br />

Illustrated above is the following sequence:<br />

""C<br />

:c<br />

o<br />

S<br />

en<br />

PROGRAM 02----~.1~---4/1__1z:!<br />

PROGRAM 03<br />

1. It is desired to program the selected address with 0111 (QO-Q3). Outputs Q 1 , Q2, and Q3 need programming.<br />

2. Q1 is verified to be at a low logic level and then the programming sequence is executed. The output is then verified to be at<br />

a high logic level.<br />

3. Q3 is an example of an output requiring three attempts to be programmed successfully.<br />

4. Q3 is programmed to a high logic level.<br />

FIGURE 1. SERIES 3 PROGRAMMING SEQUENCE<br />

4-40<br />

TEXAS "J}.<br />

INSTRUMENlS<br />

POST OFFICE SOx 225012 • DALLAS. TEXAS 75265

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