DS32EL0421 datasheet(9/32 Pages) TI1

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TXCLK

80%

20%

tCIT

80%

20%

tCIT

tBUF

tHD:STA

tLOW

tHD:DAT

tHIGH

tSU:DAT

tSU:STA

tSU:STO

SCK

SDA

SMB_CS

tSU:CS

DS32EL0421, DS32ELX0421

www.ti.com

SNLS282F – MAY 2008 – REVISED APRIL 2013

CML Timing Specifications (continued)

Over recommended operating supply and temperature ranges unless otherwise specified.

(1) (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

tJIND

Serializer Output Deterministic Jitter

Serializer output intrinsic deterministic

jitter. Measure with PRBS-7 test

pattern De-emphasis disabled.

See (3)

1.25 Gbps

2.5 Gbps

3.125 Gbps

tJINR

Serializer Output Random Jitter

Serializer output intrinsic random

jitter. Bit error rate

≥10-15.

Alternating–10 pattern. De-emphasis

disabled.

See (3)

1.25 Gbps

1.3

psRMS

2.5 Gbps

1.15

psRMS

3.125 Gbps

1.14

psRMS

tJINT

Peak-to-peak Serializer Output Jitter

Serializer output peak-to-peak jitter

includes deterministic jitter, random

jitter, and jitter transfer from serializer

input. Measure with PRBS-7 test

pattern. Bit error rate

≥10-15. De-

emphasis disabled.

See (3)

1.25 Gbps

2.5 Gbps

3.125 Gbps

λTXBW

Jitter Transfer Function -3 dB Bandwidth

1.25 Gbps

100

kHz

(4)

3.125 Gbps

300

kHz

δTX

Jitter Transfer Function Peaking

0.5

(4)

Parameter is ensured by characterization and is not tested at production.

Timing Diagrams

Figure 1. SMBus timing parameters

Figure 2. Serializer Input Clock Transition Time

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