Pin Descriptions

Pin #

Pin Name

I/O

Description

DS90C241 SERIALIZER PIN DESCRIPTIONS

22

VDDDR

VDD

Analog Voltage Supply, LVDS O/P Power

21

VSSDR

GND

Analog Ground, LVDS O/P Ground

16

VDDPT0

VDD

Analog Voltage supply, VCO Power

17

VSSPT0

GND

Analog ground, VCO Ground

14

VDDPT1

VDD

Analog Voltage supply, PLL Power

15

VSSPT1

GND

Analog Ground, PLL Ground

30

VDDT

VDD

Digital Voltage supply, Tx serializer Power

31

VSST

GND

Digital Ground, Tx serializer Ground

7

VDDL

VDD

Digital Voltage supply, Tx Logic Power

6

VSSL

GND

Digital Ground, Tx Logic Ground

42

VDDIT

VDD

Digital Voltage supply, Tx Input Power

43

VSSIT

GND

Digital Ground, Tx Input Ground

24

VSSESD

GND

ESD Ground

4-1,

48-44,

41-32,

29-25

DIN[23:0]

CMOS_I

Transmitter Data INputs

10

TCLK

CMOS_I

Transmitter reference CLocK.

Used to strobe data at the DIN inputs and to drive the transmitter PLL

9

TPWDNB

CMOS_I

Transmitter PoWer DowNBar (ACTIVE L).

TPWDNB = L; Disabled, DOUT (+/-) are TRI-STATED stand-by mode, PLL is shutdown

TPWDNB = H; Enabled

18

DEN

CMOS_I

Data ENable (ACTIVE H)

DEN = L; Disabled, DOUT (+/-) are TRI-STATED, PLL still operational

DEN=H; Enabled

13

RESRVD

CMOS_I

RESERVED - tie Low

23

PRE

CMOS_I

PRE-emphasis select pin.

PRE=(R

PRE

≥ 3kΩ); I

Ω

PRE=Hor floating; pre-emphasis off

11

TRFB

CMOS_I

Transmitter Rising/Falling Bar Clock Edge Select (H = rising edge L = falling edge)

12

VODSEL

CMOS_I

VOD level SELect

VODSEL = L; IOD

≈ 3.5 mA, (default). e.g. 3.5 mA*100Ω≈350 mV

VODSEL = H; IOD

≈ 7.0 mA, VOD doubles approximately. e.g. 7 mA*100Ω≈ 700 mV

5

DCAOFF

CMOS_I

RESERVED — tie Low

8

DCBOFF

CMOS_I

RESERVED — tie Low

20

DOUT+

LVDS_O

Transmitter LVDS true (+) OUTput

19

DOUT−

LVDS_O

Transmitter LVDS inverted (-) OUTput

DS90C124 DESERIALIZER PIN DESCRIPTIONS

39

VDDIR

VDD

Analog LVDS Voltage supply, Power

40

VSSIR

GND

Analog LVDS Ground

47

VDDPR0

VDD

Analog Voltage supply, PLL Power

46

VSSPR0

GND

Analog Ground, PLL Ground

45

VDDPR1

VDD

Analog Voltage supply, PLL VCO Power

44

VSSPR1

GND

Analog Ground, PLL VCO Ground

37

VDDR1

VDD

Digital Voltage supply, Logic Power

38

VSSR1

GND

Digital Ground, Logic Ground

36

VDDR0

VDD

Digital Voltage supply, Logic Power

35

VSSR0

GND

Digital Ground, Logic Ground

30

VDDOR1

VDD

Digital Voltage supply, LVTTL O/P Power

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