CDC582
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH DIFFERENTIAL LVPECL CLOCK INPUTS
SCAS446B – JULY 1994 – REVISED FEBRUARY 1996
Low Output Skew for Clock-Distribution
and Clock-Generation Applications
State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
Operates at 3.3-V V
External Feedback Input (FBIN) Is Used to
Synchronize the Outputs With the Clock
Inputs
CC
Distributes Differential LVPECL Clock
Inputs to 12 TTL-Compatible Outputs
Application for Synchronous DRAMs
Two Select Inputs Configure Up to Nine
Outputs to Operate at One-Half or Double
the Input Frequency
Distributed V
and Ground Pins Reduce
CC
Switching Noise
No External RC Network Required
Packaged in 52-Pin Quad Flatpack
PAH PACKAGE
(TOP VIEW)
52 51 50 49 48 47 46 45 44 43 42 41 40
39
GND
1Y1
V
4Y3
GND
V
4Y2
GND
V
4Y1
GND
GND
V
3Y3
GND
1
CC
38
37
36
35
34
33
32
31
30
29
28
27
2
V
3
CC
GND
1Y2
4
CC
5
V
6
CC
GND
1Y3
7
CC
8
V
9
CC
GND
GND
2Y1
10
11
12
13
CC
V
CC
14 15 16 17 18 19 20 21 22 23 24 25 26
description
TheCDC582isahigh-performance, low-skew, low-jitterclockdriver. Itusesaphase-lockloop(PLL)toprecisely
align the frequency and phase of the clock output signals to the differential LVPECL clock (CLKIN, CLKIN) input
signals. It is specifically designed to operate at speeds from 50 MHz to 100 MHz or down to 25 MHz on outputs
configured as half-frequency outputs. The CDC582 operates at 3.3-V V
.
CC
The feedback input (FBIN) synchronizes the frequency of the output clocks with the input clock
(CLKIN, CLKIN) signals. One of the twelve output clocks must be fed back to FBIN for the PLL to maintain
synchronizationbetweenthedifferentialCLKINandCLKINinputsandtheoutputs. Theoutputusedasfeedback
is synchronized to the same frequency as the clock (CLKIN and CLKIN) inputs.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
EPIC-ΙΙB is a trademark of Texas Instruments Incorporated.
Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265