TLK2521 Datasheet, PDF (11/19 Pages) Texas Instruments – 1 to 2.5 Gbps TRANSCEIVER

TLK2521
1 to 2.5 Gbps TRANSCEIVER
SLLS574B − JULY 2003 − REVISED JANUARY 2004
TTL input electrical characteristics over recommended operating conditions (unless otherwise
noted)
TTL Signals: TXD0 ...TXD17, GTX_CLK, LOOPEN, SYNC, PREEMPH
PARAMETER
TEST CONDITIONS
VIH High-level input voltage
VIL Low-level input voltage
IIH
High-level input current
IIL
Low-level input current
CIN Input capacitance
tr
GTX_CLK, TXD rise time
tf
GTX_CLK, TXD fall time
tsu
TXD setup to ↑ GTX_CLK
th
TXD hold to ↑ GTX_CLK
See Figure 6
See Figure 6
VDD = MAX, VIN = 2 V
VDD = MAX, VIN = 0.4 V
0.8 V to 2 V
0.8 V to 2 V, C = 5 pF, See Figure 6
2 V to 0.8 V, C = 5 pF, See Figure 6
See Figure 6
See Figure 6
MIN TYP MAX UNIT
2
3.6 V
0.8 V
40 µA
−40
µA
4 pF
1
ns
1
ns
1.5
ns
0.4
ns
RX_CLK
RXD(0−17)
tr(slew)
2V
0.8 V
0V
tf(slew)
2V
tf(slew)
tsu
th
tr(slew)
0.8 V
0V
Figure 6. TTL Data Input Valid Levels for AC Measurements
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