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CDC536DBG4 数据表(PDF) 1 Page - Texas Instruments

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部件名 CDC536DBG4
功能描述  3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH 3-STATE OUTPUTS
Download  14 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

CDC536DBG4 数据表(HTML) 1 Page - Texas Instruments

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FEATURES
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28
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AVCC
AGND
CLKIN
SEL
OE
GND
1Y1
VCC
GND
1Y2
VCC
GND
1Y3
VCC
AVCC
AGND
FBIN
TEST
CLR
VCC
2Y1
GND
VCC
2Y2
GND
VCC
2Y3
GND
DESCRIPTION
CDC536
SCAS378G – APRIL 1994 – REVISED JULY 2004
3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH 3-STATE OUTPUTS
DB OR DL PACKAGE
Low-Output Skew for Clock-Distribution and
(TOP VIEW)
Clock-Generation Applications
Operates at 3.3-V VCC
Distributes One Clock Input to Six Outputs
One Select Input Configures Three Outputs to
Operate at One-Half or Double the Input
Frequency
No External RC Network Required
External Feedback Pin (FBIN) Is Used to
Synchronize the Outputs to the Clock Input
Application for Synchronous DRAM,
High-Speed Microprocessor
Negative-Edge-Triggered Clear for
Half-Frequency Outputs
TTL-Compatible Inputs and Outputs
Outputs Drive 50-
Ω Parallel-Terminated
Transmission Lines
State-of-the-Art EPIC-IIB™ BiCMOS Design
Significantly Reduces Power Dissipation
Distributed VCC and Ground Pins Reduce
Switching Noise
Packaged in Plastic 28-Pin Shrink Small
Outline Package
The CDC536 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 synchronous DRAMs and popular microprocessors operating at speeds from 50 MHz to
100 MHz or down to 25 MHz on outputs configured as half-frequency outputs. The CDC536 operates at 3.3-V
VCC and is designed to drive a 50-W transmission line.
The feedback input (FBIN) is used to synchronize the output clocks in frequency and phase to the input clock
(CLKIN). One of the six output clocks must be fed back to FBIN for the PLL to maintain synchronization between
CLKIN and the outputs. The output used as the feedback pin is synchronized to the same frequency as CLKIN.
The Y outputs can be configured to switch in phase and at the same frequency as CLKIN. The select (SEL) input
configures three Y outputs to operate at one-half or double the CLKIN frequency depending on which pin is fed
back to FBIN (see Tables 1 and 2). All output signal duty cycles are adjusted to 50% independent of the duty
cycle at the input clock.
Output-enable (OE) is provided for output control. When OE is high, the outputs are in the high-impedance state.
When OE is low, the outputs are active. TEST is used for factory testing of the device and can be use to bypass
the PLL. TEST should be strapped to GND for normal operation.
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-IIB is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 1994–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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