TIBPAL20L8-5C Datasheet, PDF (16/35 Pages) Texas Instruments – HIGH-PERFORMANCE IMPACT-X PAL CIRCUITS

TIBPAL20L8-5C, TIBPAL20R4-5C, TIBPAL20R6-5C, TIBPAL20R8-5C
TIBPAL20L8-7M, TIBPAL20R4-7M, TIBPAL20R6-7M, TIBPAL20R8-7M
HIGH-PERFORMANCE IMPACT-X ™ PAL^® CIRCUITS
SRPS010F – D3353, OCTOBER 1989 – REVISED SEPTEMBER 1992
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].
asynchronous 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.
Lower Pin 13 to 5 V.
Remove output voltage, then lower Pin 13 to V_IL. Preload can be verified by observing the
voltage level at the output pin.
VIHH
Pin 13
5V
VIL
td
Registered Output
tsu + t_h
Input
td
VIH
VOH
Output
VIL
VOL
Figure 1. Asynchronous Preload Waveforms
NOTE 3: td = tsu = th = 100 ns to 1000 ns, VIHH = 10.25 V to 10.75 V
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