TheTTL - Al Kossow's Bitsavers

ecommended operating conditions for programming (see Figure 1)
TBP34R162, TBP34R16X
16,384-BIT (4096 WORDS BY 4 BITS) REGISTERED
PROGRAMMABLE READ-ONLY MEMORY
MIN NOM MAX UNIT
VCC Supply voltage during verification 4.5 5 5.5 V
VIH High-level input voltage 3 3 4 \5
VIL Low-level input voltage 0 0.2 0.4 V
Enable G voltage during verification 0 0.2 0.4 V
Enable G inactive voltage during programming 4.5 5 5.5 V
VCC(pr) Supply voltage program pulse amplitude 12 12.5 13 V
twl VCC program pulse duration, 1 st attempt 10 11 12 I'-s
tw2 VCC program pulse duration, 2nd attempt 20 22 25 I'-s
tw3 VCC program pulse duration, 3rd attempt 20 22 25 I'-s
tsu Setup time, enable G low before VCC(pr) t 0.1 0.5 1 I'-s
th Hold time, enable G low before VCC(pr)t 0.1 0.5 1 I'-s
tr(VCC) Rise time, VCC(pr) (5 V to 12 V) 0.3 0.4 0.5 I'-s
tf(VCC) Fall time, VCC(pr) (12 V to 5 V) 0.05 0.1 0.2 I'-s
td Delay time between successive VCC(pr) pulses 10 20 30 I'-s
tcool Cooling time between words 100 150 200 I'-s
TA Free-air temperature 20 35 30 °c
t Measured from 1.5 V on enable pin to 5.5 V on VCC(pr)'
t Measured from 5.5 V on VCC(pr) to 1.5 V on enable pin.
step-by-step programming instructions (see Figure 1)
1. Address the word to be programmed, apply 5 V to Vee and a low logic level to the G input.
2. Verify the selected bit location that requires programming. Note: The only bit positions that require
programming are outputs to be at 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 the
next word.
4. Deselect PROM by applying 5 V to G.
5. Connect a 4-mA current source (clamped to Vee) to the output 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 steps 2 through 7 and increment X (where X equals 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.
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INSTRUMENTS
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