CDC2586
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH 3-STATE OUTPUTS
SCAS337C – FEBRUARY 1993 – REVISED OCTOBER 1998
Low Output Skew for Clock-Distribution
and Clock-Generation Applications
Application for Synchronous DRAM,
High-Speed Microprocessor
Operates at 3.3-V V
TTL-Compatible Inputs and Outputs
CC
Distributes One Clock Input to Twelve
Outputs
Outputs Have Internal 26-Ω Series
Resistors to Dampen Transmission-Line
Effects
Two Select Inputs Configure Up to Nine
Outputs to Operate at One-Half or Double
the Input Frequency
State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
No External RC Network Required
Distributed V
Switching Noise
and Ground Pins Reduce
CC
External Feedback (FBIN) Synchronizes the
Outputs to the Clock Input
Packaged in 52-Pin Thin Quad Flat Package
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
NC – No internal connection
description
The CDC2586 is a high-performance, low-skew, low-jitter clock driver. It uses a phase-lock loop (PLL) to
precisely align, in both frequency and phase, the clock output signals to the clock input (CLKIN) signal. It is
specifically designed for use with popular microprocessors operating at speeds from 50 MHz to 100 MHz or
down to 25 MHz on outputs configured for half-frequency operation. Each output has an internal 26-Ω series
resistor that improves the signal integrity at the load. The CDC2586 operates at nominal 3.3-V V
.
CC
The feedback input (FBIN) synchronizes the output clocks in frequency and phase to CLKIN. One of the twelve
output clocks must be fed back to FBIN for the PLL to maintain synchronization between CLKIN and the outputs.
The output used as feedback is synchronized to the same frequency as CLKIN.
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-ΙΙΒ is a trademark of Texas Instruments Incorporated.
Copyright 1998, 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
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