TheTTL - Al Kossow's Bitsavers

TBP38L 165, TBP38L 166, TBP38L 16X
16,384-BIT (2048 WORDS BY 8-BITS) LOW-POWER
PROGRAMMABLE READ-ONLY MEMORY WITH 3-STATE OUTPUTS
recommended operating conditions for programming (see Figure 1)
Supply voltage during verification
Input voltage
Enable voltage during verification
Enable inactive voltage durinq programming
VCC program pulse amplitude
VCC program pulse duration
Enable set-up time t before VCC(pr)
Enable hold timet after VCC(pr)
Rise time of VCC(pr) §
Fall time of VCC(pr) ~
I 1st attempt
I 2nd attempt
I 3rd attempt
Delay time between successive VCC(pr) pulses
Delay time between successive VCC(pr) pulses
Cooling time between words
Free-air temperature
tMeasured from 1.5 Von enable pin to 5.5 V on VCC(pr)
tMeasured 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
VCC
VIH
VIL
G1
G2.G3
G1
G2. G3
VCC(pr)
tw1
tw2
!wl
tsu(en)
th(en)
tr(VCC)
tf(VCC)
td1
td2
tcool
TA
MIN NOM MAX UNIT
4.5 5 5.5 V
3 4 5
0 0.2
0.5
0 0.2 0.4
3 4
5
4.5 5 5.5
0 0.2
0.4
V'
V
V
12 12.5 13 V
10 11 12
20 22 25 p.s
20 22 25
0.1 0.5 1 p.s
0.1 0.5 1 p.s
0.3 0.4 0.5 p'S
0.05 0.1 0.2 p'S
10 20 30 JLS
10 20 30 p'S
100 150 200 p'S
20 25 30 DC
step-by-step programming instructions (see Figure 1)
1. Address the word to be programmed, apply 5 volts to Vee and active levels to all enable inputs (G1,
G2, G3).
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 G1, or 0 volts to G2 or G3.
5. Connect a 4-mA current source (clamped to Vee) to the output that is to be programme.d.
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 programmed using Vee values of 4.5 volts
and 5.5 volts.
(f)
~
o
a:::
a.
TEXAS·~
INSTRUMENTS
POST OFFICE BOX 225012 • DALLAS. TEXAS 75265
4-81