Datasheet

XC7SET125_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 4 September 2009 5 of 14
NXP Semiconductors
XC7SET125
Bus buffer/line driver; 3-state
11. Dynamic characteristics
[1] t
pd
is the same as t
PLH
and t
PHL
.
t
en
is the same as t
PZL
and t
PZH
.
t
dis
is the same as t
PLZ
and t
PHZ
.
[2] Typical values are measured at V
CC
= 5.0 V.
[3] C
PD
is used to determine the dynamic power dissipation P
D
(µW).
P
D
=C
PD
× V
CC
2
× f
i
+ ∑ (C
L
× V
CC
2
× f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in Volts.
12. Waveforms
Table 8. Dynamic characteristics
GND = 0 V; For test circuit see Figure 9.
Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ Max Min Max Min Max
t
pd
propagation
delay
A to Y; see Figure 7
[1]
V
CC
= 4.5 V to 5.5 V
[2]
C
L
= 15 pF - 3.4 5.5 1.0 6.5 1.0 7.0 ns
C
L
= 50 pF - 4.8 7.5 1.0 8.5 1.0 9.5 ns
t
en
enable time OE to Y; see Figure 8
[1]
V
CC
= 4.5 V to 5.5 V
[2]
C
L
= 15 pF - 3.9 5.1 1.0 6.0 1.0 6.5 ns
C
L
= 50 pF - 5.1 7.5 1.0 8.5 1.0 9.5 ns
t
dis
disable time OE to Y; see Figure 8
[1]
V
CC
= 4.5 V to 5.5 V
[2]
C
L
= 15 pF - 4.5 6.8 1.0 8.0 1.0 8.5 ns
C
L
= 50 pF - 6.1 8.8 1.0 10.0 1.0 11.0 ns
C
PD
power
dissipation
capacitance
per buffer;
C
L
=50pF;f=1 MHz;
V
I
= GND to V
CC
[3]
-11- - - - - pF
Measurement points are given in Table 9.
V
OL
and V
OH
are typical output voltage levels that occur with the output load.
Fig 7. Input (A) to output (Y) propagation delays
mnb153
t
PHL
t
PLH
V
M
V
M
A input
Y output
GND
V
I
V
OH
V
OL