ICS9DB423B

4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI

IDT®

4-OUTPUT DIFFERENTIAL BUFFER FOR PCIE GEN1, GEN2, AND QPI

7

ICS9DB423B

REV E 091812

Electrical Characteristics–DIF 0.7V Current Mode Differential Pair

TA = 0 - 70°C; VDD = 3.3 V +/-5%; CL =2pF, RS=33Ω, RP=49.9Ω, RREF=475Ω

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS NOTES

Current Source Output

Impedance

Zo

1

3000

Ω

1

Voltage High

VHigh

660

850

1,2

Voltage Low

VLow

-150

150

1,2

Max Voltage

Vovs

1150

1

Min Voltage

Vuds

-300

1

Crossing Voltage (abs)

Vcross(abs)

250

550

mV

1

Crossing Voltage (var)

d-Vcross

Variation of crossing over all edges

140

mV

1

Rise Time

tr

VOL = 0.175V, VOH = 0.525V

175

700

ps

1

Fall Time

tf

VOH = 0.525V VOL = 0.175V

175

700

ps

1

Rise Time Variation

d-tr

125

ps

1

Fall Time Variation

d-tf

125

ps

1

Duty Cycle

dt3

Measurement from differential wavefrom

45

55

%

1

tpdBYP

Bypass Mode, VT = 50%

2500

4500

ps

1

tpdPLL

PLL Mode VT = 50%

-250

250

ps

1

Skew, Output to Output

tsk3

VT = 50%

50

ps

1

PLL mode

50

ps

1,3

Additive Jitter in Bypass Mode

50

ps

1,3

PCIe Gen1 phase jitter

(Additive in Bypass Mode)

710

ps

(pk2pk)

1,4,5

PCIe Gen 2 Low Band phase jitter

(Additive in Bypass Mode)

00.1

ps

(rms)

1,4,5

PCIe Gen 2 High Band phase jitter

(Additive in Bypass Mode)

0.7

0.9

ps

(rms)

1,4,5

QPI phase jitter

(Additive in Bypass Mode)

0.16

ps

(rms)

1,5,6

PCIe Gen 1 phase jitter

37

86

ps

(pk2pk)

1,4,5

PCIe Gen 2 Low Band phase jitter

1.5

3

ps

(rms)

1,4,5

PCIe Gen 2 High Band phase jitter

2.7/

2.2

3.1

ps

(rms)

1,4,5,7

QPI phase jitter

0.28

0.5

ps

(rms)

1,5,6

1Guaranteed by design and characterization, not 100% tested in production.

2 I

REF = VDD/(3xRR).

For RR = 475Ω (1%), IREF = 2.32mA. IOH = 6 x IREF and VOH = 0.7V @ ZO=50Ω.

3 Measured from differential waveform

4 See http://www.pcisig.com for complete specs

5 Device driven by 932S421C or equivalent.

6 6.4Gb 12UI

7 First number is High Bandwidth Mode, second number is Low Bandwidth Mode

tjphasePLL

Skew, Input to Output

Statistical measurement on single ended

signal using oscilloscope math function.

mV

Measurement on single ended signal

using absolute value.

mV

Jitter, Cycle to cycle

tjcyc-cyc

tjphaseBYP

Jitter, Phase