TIBPAL20L8-7C_15 Datasheet, PDF (16/28 Pages) Texas Instruments – HIGH-PERFORMANCE IMPACT-X

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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
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
(t_su + t_pd CLK-to-Q).
Thus, ^{fmax with external feedback}
+
(tsu
)
1
tpd CLK * to * Q).
CLK
LOGIC
ARRAY
C1
1D
NEXT DEVICE
t_su
t_pd CLK - to - Q
t_su
Figure 5. f_max With External Feedback
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