Datasheet
SLLS591C− OCTOBER 2003 − REVISED JULY 2007
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TTL input electrical characteristics over recommended operating conditions (unless otherwise
noted)
TTL Signals: TXD0 ...TXD17, GTX_CLK, LOOPEN, SYNC, PREEMPH
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IH
High-level input voltage See Figure 6 2 3.6 V
V
IL
Low-level input voltage See Figure 6 0.8 V
I
IH
High-level input current V
DD
= MAX, V
IN
= 2 V 40 µA
I
IL
Low-level input current V
DD
= MAX, V
IN
= 0.4 V −40 µA
C
IN
Input capacitance 0.8 V to 2 V 4 pF
t
r
GTX_CLK, TXD rise time 0.8 V to 2 V, C = 5 pF, See Figure 6 1 ns
t
f
GTX_CLK, TXD fall time 2 V to 0.8 V, C = 5 pF, See Figure 6 1 ns
t
su
TXD setup to ↑ GTX_CLK See Figure 6 1.5 ns
t
h
TXD hold to ↑ GTX_CLK See Figure 6 0.4 ns
TXD(0−17)
2 V
0.8 V
2 V
0.8 V
GTX_CLK
t
su
t
h
t
f
t
r
0 V
0 V
t
r
t
f
3.6 V
3.6 V
Figure 6. TTL Data Input Valid Levels for AC Measurements