TheTTL - Al Kossow's Bitsavers

TBP38S030, TBP38L030, TBP38SA030
TBP38S03X, TBP38L03X, TBP38SA03X
256·BIT (32 WORDS BY 8 BITS) PROGRAMMABLE READ·ONLY MEMORIES
recommended operating conditions for programming (see Figure 1)
Supply voltage during verification
Input voltage
Enable voltage during verification
Enable inactive voltage during programming
VCC program pulse amplitude
VCC program pulse duration
Enable set-up time t before VCC(pr)
Enable hold time* after VCC(pr)
Rise time of VCC(pr) §
Fall time of VCC(pr)'
I 1 st attempt
I 2nd attempt
I 3rd attempt
Delay time between successive VCC(pr) pulses
Hold time between successive VCC(pr) pulses
Cooling time between words
Free-air temperature
MIN
VCC 4.5
VIH 3
VIL 0
G 0
G 4.5
VCC(pr) 12
tw1 10
tw2 20
tw3 20
tsu(en) 0.1
th(en) 0.1
tr(VCC) 0.3
tf(VCC) 0.05
tdl 10
td2 10
tcool 100
TA 20
NOM MAX UNIT
5 5.5 V
4 5
V
0.2 0.5
0.2 0.4 V
5 5.5 V
12.5 13 V
11 12
22 25 P.s
22 25
0.5 1 flS
0.5 1 flS
0.4 0.5 flS
0.1 0.2 flS
20 30 p'S
20 30 P.s
150 200 flS
25 30 °C
tMeasured from 1.5 V on enable pin to 5.5 V on VCC(pr)
*Measured from 5.5 V on VCC(pr) to 1.5 V on enable pin
§Measured from 5 V to 12 V
, Measured from 12 V to 5 V
II
step-by-step programming instructions (see Figure 1)
G input.
~ 1. ~ddress the word to be programmed, apply 5 volts to Vee and a low-logic-level voltage to the enable
"'C
lJ
o
S
CJ)
2. Verify the selected bit location that requires programming. Note: The only bit positions that require
programming are outputs needing a high logic level.
3. For bit locations that do not require programming, go to step 2 for the next bit, or to step 1 for next word.
4. Deselect PROM by applying 5 volts to G.
5. Connect a 4-mA current source (clamped to Vee) to the output that is to be programmed.
6. Increase Vee to Vee(pr) for a pulse duration equal to twx (where X is determined by the number
of programming attempts, i.e., 1,2,3). Minimum current capability for the Vee power supply should
be 400 mAo
7. Verify that the output has been programmed to a high logic level. If the output has been programmed
correctly, go to the next bit. If not, repeat step 2 through step 7 and increment X (where X is equal
to 1 on the first programming attempt). If the output has not been programmed by the third attempt,
stop programming and go to a new device.
8. Verify programming of every word after all words have been prog~ammed using Vee values of 4.5 volts
and 5.5 volts.
4-72
TEXAS -I/}
INSTRUMENTS
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