Datasheet

TX_CLK
3.6V
0V
TXD[0-19]
1.25V
1.7V
1.7V
0.8V
3.6V
0V
0.8V
TLK2541
SLLS779B –JANUARY 2008–REVISED APRIL 2008 www.ti.com
TTL INPUT ELECTRICAL CHARACTERISTICS
over recommended operating conditions (unless otherwise noted), TTL signals: TXD[0:19], TX_CLK, LOOPEN, ENABLE,
PRBS_EN, PRE , CTRL0, CTRL1, TXRATE, RXRATE, REFCLK, LCKREFN, TESTEN, RXCODE
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IH
High-level input voltage See Figure 2 1.7 3.6 V
V
IL
Low-level input voltage See Figure 2 0.8 V
I
IH
Input high current V
DD
= MAX, V
IN
= 2 V 40 μA
I
IL
Input low current V
DD
= MAX, V
IN
= 0.4 V –40 μA
C
I
Receiver input capacitance 4.5 pF
t
r
Rise time, TXD[0..19] 0.8 V to 1.7 V, C = 5 pF, See Figure 2 1 ns
t
f
Fall time, TX_CLK, TXD[0..19] 1.7 V to 0.8 V, C = 5 pF, See Figure 2 1 ns
t
su
TXD[0:19], setup to ↑ TX_CLK See Figure 2 1.5 ns
t
h
TXD[0:19], hold to ↑ TX_CLK See Figure 2 0.5 ns
Figure 2. TTL Data Input Valid Levels for AC Measurements
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