2

COMMERCIALANDINDUSTRIALTEMPERATURERANGES

IDT5991A

PROGRAMMABLESKEWPLLCLOCKDRIVERTURBOCLOCK

PIN CONFIGURATION

NOTE:

1. Stresses beyond those listed under ABSOLUTE MAXIMUM RATINGS may cause

permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions above those indicated in the

operational sections of this specification is not implied. Exposure to absolute-

maximum-rated conditions for extended periods may affect device reliability.

Symbol

Description

Max

Unit

Supply Voltage to Ground

–0.5 to +7

V

DC Input Voltage

–0.5 to +7

V

Junction Temperature

150

°C

Storage Temperature

–65 to +150

°C

NOTE:

1. Capacitance applies to all inputs except TEST, FS, and nF1:0.

Parameter

Description

Typ.

Max.

Unit

InputCapacitance

5

7

pF

PIN DESCRIPTION

Pin Name

Type

Description

REF

IN

ReferenceClockInput

FB

IN

FeedbackInput

IN

When MID or HIGH, disables PLL (except for conditions of Note 1). REF goes to all outputs. Skew selections (see Control

SummaryTable)remainineffect. SetLOWfornormaloperation.

IN

IN

Selectablepositiveornegativeedgecontrol. WhenLOW/HIGHtheoutputsaresynchronizedwiththenegative/positiveedge ofthe

referenceclock.

IN

3-level inputs for selecting 1 of 9 skew taps or frequency functions

FS

IN

Selectsappropriateoscillatorcircuitbasedonanticipatedfrequencyrange. (SeePLLProgrammableSkewRange.)

OUT

Fourbanksoftwooutputswithprogrammableskew

PWR

Powersupplyforoutputbuffers

PWR

Powersupplyforphase lockedloop and other internal circuitry

GND

PWR

Ground

NOTE:

PLCC

TOP VIEW

Output skew with respect to the REF input is adjustable to compensate

for PCB trace delays, backplane propagation delays or to accommodate

requirements for special timing relationships between clocked compo-

order of a nanosecond (see PLL Programmable Skew Range and Resolution

Table). There are nine skew configurations available for each output

to minimize the number of control pins, 3-level inputs (HIGH-MID-LOW)

are used, they are intended for but not restricted to hard-wiring. Undriven

3-level inputs default to the MID level. Where programmable skew is

not a requirement, the control pins can be left open for the zero skew

default setting. The Control Summary Table shows how to select specific

PROGRAMMABLESKEW

5

6

7

8

9

10

11

12

13

29

28

27

26

25

24

23

22

21

GND

GND

GND/sOE

GND

GND

4

3

2

1

32

31

30

14

15

16

17

18

19

20