TIBPAL22V10-5C Datasheet, PDF (10/17 Pages) Texas Instruments – HIGH-PERFORMANCE IMPACT-XLE PROGRAMMABLE ARRAY LOGIC CIRCUIT

TIBPAL22V10-5C
HIGH-PERFORMANCE IMPACT-XL™ PROGRAMMABLE ARRAY LOGIC CIRCUIT
SRPS028A – MAY 1992 – REVISED OCTOBER 1993
preload procedure for registered outputs (see 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 V and pin 1 at V_IL, raise pin 14 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 14 to V_IL. Preload can be verified by observing the
voltage level at the output pin.
Pin 14
Pin 1
tsu
td
td
tw
VIHH
VIL
VIH
VIL
Registered I/O
Input
VIH
VOH
Output
VIL
VOL
Figure 2. Preload Waveforms
NOTE 3: t_d = t_su = t_w = 100 ns to 1000 ns. V_IHH = 10.25 V to 10.75 V.
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