TheTTL - Al Kossow's Bitsavers

TBP38S22, TBP38L22, TBP38SA22
TBP38S2X, TBP38L2X, TBP38SA2X
2,048·BI1 (256 WORDS BY 8 BITS) PROGRAMMABLE READ·ONLY MEMORIES
AOTOA~ VALlO ADDRESS !
Vee
x::=
I ~-~--~~--tw-,---~~~~-t-w-,---~~---~-t-W2----~----~~-t-W-3~---~----k---t w -,-------
I I I , I I I I I I I
- - - -'2.5V
G
I
H
I
------5V
..... --------- 0 V
I
01 I
--~----------------------~---+J--~--~------
·1 I I
02 1 1
I
I
07 I
M2~~~~r.w~'-------PROGRAM02--------~~Ir-~~r--~~~~~~1
I
VOH
LVOL
"-----...... - VOH
LVOL
lPROGRAM 07
Illustrated above is the following sequence:
1) It is desired to program the selected address with 01100001 (QO-Q7). Only outputs Q 1, Q2 and Q7 need programming.
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 a high
logic level.
3) Q2 is an example of an output requiring three attempts to be programmed successfully.
4) Q7 is programmed to a high logic level.
FIGURE 1. SERIES 3 PROGRAMMING SEQUENCE
4-108
TEXAS -I./}
INSTRUMENTS
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