TheTTL - Al Kossow's Bitsavers

TIBPALT19LB, TIBPALT19R4, TIBPALT19R6, TIBPALT19RB
HIGH·PERFORMANCE LATCHED·INPUT PAL CIRCUITS
programming procedure for architectural fuses (see Notes 5 and 6)
Program:
Step 1
Step 2
Step 3
Step 4
Step 5
Verify:
Step 6
Step 7
Step 8
Step 9
Step 10
Step 11
Apply VIL to all I/D pins and pins 1, 13 and 14; and 5 volts to the VCC pin.
Raise VCC pin to VIHH.
Raise INLE pin to VIHH.
To program a D input pin into an I input pin, pulse the selected pin to VIHH.
Lower INLE to VIL and VCC to 5 volts.
Raise pin 13 and I/D input pins 2 thru 11 to VIHH, with I/D pin 23 at VIL.
Set pin 22 to Z to select pins 2 thru 11 or set pin 22 to VIHH to. select pin 23.
Raise INLE to VIHH.
To verify architectural fuses at pins 2 thru 11, lower one of these pins to VIH. 'When verifying
pin 23, lower pin 2 to VIH.
Clock pin 1, then lower the pin at VIH in step 9 to VIL. Clock pin 1. If pin 15 is high, fuse is
intact. If pin 15 is low, fuse is blown.
Repeat above steps 1 thru 10 for ea"ch D input to be programmed into an I input.
programming waveforms for architectural fuses (see Note 6)
vCCvIHH?------~ PROGRAM ~
5 V _ _ _ I I \~-------V-E-R-IF-Y-------_
I I I \
I +II+- I!
o v I tw1 I ~ M-t~3 I '-----
t~3~ II I I~
VIHH ------ ""1
1
- il I I I I
I I I I I I
I/O INPUTS I I I I 1 I I
I I I I I
VIL -------+-1 -+.-f
PIN '4 "NLE'V:~ ------ - ~
.... II
td3-.t I4i td3~ ~ -+t I4- t d3
\,..! -+-1 ____
I -f(,..-......:..--.......:.----~\'-I ____ _
td3--.t 14-_-:----I----+------iI:--i~
PIN '3IOE,VIHH--- - - - ---- - - - TI 'dlJ !4-i ,
VIL ---------------fl~ I I 1----
-;.t l4-td3
PIN 22 (UR) ~
VIHH _______ HIG~T~S::.~~N23~
Z LOW TO SELECT PINS 2 THRU 11 tpd--i+-+l I4-+1-tpd
tsu-+l ,... I I 1
PIN1(OUTCLK) VIH------------------nLSl
'
PIN 15 (OUTPUT)
VIL I +1----------
~
Z--------------------------------------~\J t=i~------
VOH -. 1_- - - -FUSE INTACT
VOL - - - - - - - FUSE BLOWN
Z = High-impedance (e.g., 10 kO to 5 V).
NOTES: 5. Refer to pin assignments in operating mode for programming selected I/D pins from D input to be programmed into I inputs.
6. Pin numbers shown are for JW and NT packages only. If chip carrier socket adapter is not used, pin numbers must be changed
accordingly.
•(.)
'0,
o
...J
Q)
~
ro
E
E
ro
:r...
C)
o
:r...
a..
-0
a:;
u::
TEXAS ..
INSTRUMENTS
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