ORSPI4 datasheet(177/263 Pages) LATTICE

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Lattice Semiconductor

ORCA ORSPI4 Data Sheet

177

Figure 88. Output Buffer Delays

Table 57. LVDS Driver AC Data

Termination Resistor

The LVDS drivers and receivers operate at 100

Ω differential impedance, as shown below. External resistors are not

required. The differential driver and receiver buffers include termination resistors inside the device package, as shown in Figure

89 below. The center tap inputs should be connected to ground via a .01 pF capacitor.

Figure 89. SPI4 LVDS Driver and Receiver and Associated Internal Components

Parameter

Symbol

Test Conditions

Min.

Typ.

Max.

Units

VOD Fall Time, 80% to 20%

ZL = 100

Ω ± 1%

CPAD = 3.0 pF, CPAD = 3.0 pF

100

—

210

VOD Rise Time, 20% to 80%

ZL = 100

Ω ± 1%

CPAD = 3.0 pF, CPAD = 3.0 pF

100

—

210

Differential Skew

|tPHLA – tPLHB| or |tPHLB – tPLHA|tSKEW1

Any differential pair on pack-

age at 50% point of the tran-

sition

—

1. VDD33 = 3.1V - 3.5 V, VDD15 = 1.4V - 1.6 V, -40˚C.

PAD

OUT

PAD

OUT

3pF

ts[i]

out[i]

LVDS Receiver

LVDS Driver

100

Center Tap

External Device Pins

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