TIBPAL20L8-7C_15 Datasheet, PDF (13/28 Pages) Texas Instruments – HIGH-PERFORMANCE IMPACT-X

OBSOLETE - No Longer Available
TIBPAL20L8-7C, TIBPAL20R4-7C, TIBPAL20R6-7C, TIBPAL20R8-7C
TIBPAL20L8-10M, TIBPAL20R4-10M, TIBPAL20R6-10M, TIBPAL20R8-10M
HIGH-PERFORMANCE IMPACT-X ™ PAL^® CIRCUITS
SRPS005E − D3307, OCTOBER 1989 − REVISED DECEMBER 2010
programming information
Texas Instruments programmable logic devices can be programmed using widely available software and
inexpensive device programmers.
Complete programming specifications, algorithms, and the latest information on hardware, software, and
firmware are available upon request. Information on programmers capable of programming Texas Instruments
programmable logic is also available, upon request, from the nearest TI field sales office, local authorized TI
distributor, or by calling Texas Instruments at [phone].
preload procedure for registered outputs (see Figure 1 and Note 3)
The output registers can be preloaded to any desired state during device testing. This permits any state to be
tested without having to step through the entire state-machine sequence. Each register is preloaded individually
by following the steps given below.
Step 1.
Step 2.
Step 3.
Step 4.
With V_CC at 5 volts and Pin 1 at V_IL, raise Pin 13 to V_IHH.
Apply either V_IL or V_IH to the output corresponding to the register to be preloaded.
Pulse Pin 1, clocking in preload data.
Remove output voltage, then lower Pin 13 to V_IL. Preload can be verified by observing the
voltage level at the output pin.
Pin 13
Pin 1
t_su
t_d
t_d
t_w
V_IHH
V_IL
V_IH
V_IL
Registered I/O
Input
V_IH
V_OH
Output
V_IL
V_OL
Figure 1. Preload Waveforms
NOTE 3: t_d = t_su = t_h = 100 ns to 1000 ns V_IHH = 10.25 V to 10.75 v
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