TheTTL - Al Kossow's Bitsavers

AOTOA4J
Vee
G
01
TBP38S030, TBP38L030, TBP38SA030
TBP38S03X, TBP38L03X, TBP38SA03X
256·BIT (32 WORDS BY 8 BITS) PROGRAMMABLE READ·ONLY MEMORIES
VAllO ADDRESS
: x=
I ~twl ~tw2 ~tw3 ~twl
I I I I I I I ------ 12.5V
I
I
~ j4-th(en)
-----5V
OV
I
I I
r
~ - VOH
L VOL
I :
02 I I - VOH
I
I
07
I
I
I
~
I
PROGRAM 02
~ } ~ ~I
PROGRAM 07
I
VOL
- VOH
L VOL
Illustrated above is the following sequence:
1) . It is desired to program the selected address with 01100001 (QO-Q7). Only outputs Ql. Q2. and Q7 need programming.
2) Q 1 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 logic level.
3) Q2 is an example of an output requiring three atttempts to be programmed successfully.
4) Q7 is programmed to a high logic level.
FIGURE 1. SERIES 3 PROGRAMMING SEQUENCE
(/)
~
o
ex:
a.
TEXAS -IJ}
INSTRUMENTS
POST OFFICE BOX 225012 • DALLAS. TEXAS 75265
4-73