CDC2582
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH DIFFERENTIAL LVPECL CLOCK INPUTS
SCAS379B – FEBRUARY 1993 – REVISED FEBRUARY 1996
Low Output Skew for Clock-Distribution
and Clock-Generation Applications
Application for Synchronous DRAMs
Outputs Have Internal 26-Ω Series
Resistors to Dampen Transmission-Line
Effects
Operates at 3.3-V V
CC
Distributes Differential LVPECL Clock
Inputs to 12 TTL-Compatible Outputs
State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
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
External Feedback Input (FBIN) Is Used to
Synchronize the Outputs With the Clock
Inputs
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
The CDC2582 is a high-performance, low-skew, low-jitter clock driver. It uses a phase-lock loop (PLL) to
precisely align the frequency and phase of the clock output signals to the differential LVPECL clock (CLKIN,
CLKIN)inputsignals. Itisspecifically designed to operate at speeds from 50 MHz to 100 MHz or down to 25 MHz
on outputs configured as half-frequency outputs. Each output has an internal 26-Ω series resistor that improves
the signal integrity at the load. The CDC2582 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 synchronization
between the differential CLKIN and CLKIN inputs and the outputs. The output used as feedback 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