TLK2521

1 to 2.5 Gbps TRANSCEIVER

SLLS574B − JULY 2003 − REVISED JANUARY 2004

13

POST OFFICE BOX 655303

transmitter/receiver characteristics

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

VOD(p)

VOD(p) = |VTXP-VTXN|,

DC coupled. Preemphasis = high, See Figure 8

675

900

1280

mV

VOD(p)

VOD(p) = |VTXP-VTXN|,

Preemphasis VOD, direct

DC coupled. Preemphasis = low, See Figure 8

600

800

1210

mV

VOD(pp−p)

Differential, peak to peak output

DC coupled. Preemphasis = high, See Figure 8

1350

1800

2560

mV

VOD(pp−p)

Differential, peak to peak output

voltage with preemphasis

DC coupled. Preemphasis = low, See Figure 8

1200

1600

2420

mV

VOD(d)

VD(d) = |VTXP-VTXN|,

De-emphasis VOD, direct

DC coupled. See Figure 8

500

750

1100

mV

VOD(pp−d)

Differential, peak to peak output

voltage with deemphasis

DC coupled. See Figure 8

1000

1500

2200

mV

V(cmt)

Transmit termination voltage range,

(VTXP + VTXN)/2

1000

1250

1400

mV

VID

Receiver input voltage differential

VID= |RXP – RXN|

200

mV

Vcmr

Receiver common-mode voltage

range, (VRXP + VRXN)/2

1000

VDD−

350

mV

Iin

Receiver input leakage

−10

10

µA

Cin

Receiver input capacitance

2

pF

tt, tf

Differential output signal rise,

fall time (20% to 80%)

RL = 50 Ω, CL = 5 pF, See Figure 12

100

150

ps

Serial transmit data total jitter

(peak-to-peak)

Differential output jitter, random + deterministic,

223−1 PRBS pattern at 2.5 Gbps

0.15

UI

Receive jitter tolerance

Total input jitter, PRBS pattern, permitted eye

closure at zero crossing

0.5

UI

Tlatency

TX latency

At 1 Gbps

16

19

Bit

Tlatency

TX latency

At 2.5 Gbps

18

21

Bit

times

Rlatency

RX latency

At 1 Gbps

88

95

Bit

Rlatency

RX latency

At 2.5 Gbps

90

103

Bit

times

VOD(d)

VOD(p)

V(cmt)

VOD(p)

VOD(d)

Bit

Time

Bit

Time

tr

tf

VOD(pp_p)

VOD(pp_d)

Figure 8. Differential and Common-Mode Output Voltage Definitions