TIBPAL20L8-5C Datasheet, PDF (19/35 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
f_max SPECIFICATIONS
f_max with external feedback, see Figure 5
This configuration is a typical state-machine design with feedback signals sent off-chip. This external feedback
could go back to the device inputs or to a second device in a multi-chip state machine. The slowest path defining
the period is the sum of the clock-to-output time and the input setup time for the external signals
+ _{) * *} ^{(tsu + tpd CLK-to-Q).}
Thus, ^{fmax with external feedback}
(tsu
1
tpd CLK to Q).
CLK
Logic
Array
C1
1D
Next Device
tsu
tpd CLK - to - Q
tsu
Figure 5. f_max With External Feedback
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