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CDC536DL Datasheet(PDF) 4 Page - Texas Instruments

No. de pieza CDC536DL
Descripción Electrónicos  3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH 3-STATE OUTPUTS
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CDC536
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH 3-STATE OUTPUTS
SCAS378F – APRIL 1994 – REVISED OCTOBER 1998
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
CLKIN
3
I
Clock input. CLKIN provides the clock signal to be distributed by the CDC536 clock-driver circuit. CLKIN is used
to provide the reference signal to the integrated phase-lock loop that generates the clock output signals. CLKIN
must have a fixed frequency and fixed phase in order for the phase-lock loop to obtain phase lock. Once the
circuit is powered up and a valid CLKIN signal is applied, a stabilization time is required for the phase-lock loop
to phase lock the feedback signal to its reference signal.
CLR
24
I
CLR is used for testing purposes only.
FBIN
26
I
Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hardwired to one of the
six clock outputs to provide frequency and phase lock. The internal PLL adjusts the output clocks to obtain zero
phase delay between the FBIN and differential CLKIN inputs.
OE
5
I
Output enable. OE is the output enable for all outputs. When OE is low, all outputs are enabled. When OE is
high, all outputs are in the high-impedance state. Since the feedback signal for the phase-lock loop is taken
directly from an output, placing the outputs in the high-impedance state interrupts the feedback loop; therefore,
when a high-to-low transition occurs at OE, enabling the output buffers, a stabilization time is required before
the phase-lock loop obtains phase lock.
SEL
4
I
Output configuration select. SEL selects the output configuration for each output bank (e.g. 1
×, 1/2×, or 2×).
(see Tables 1 and 2).
TEST
25
I
TEST is used to bypass the phase-lock loop circuitry for factory testing of the device. When TEST is low, all
outputs operate using the PLL circuitry. When TEST is high, the outputs are placed in a test mode that bypasses
the PLL circuitry. TEST should be grounded for normal operation.
1Y1 – 1Y3
7, 10, 13
O
These outputs are configured by SEL to transmit one-half or one-fourth the frequency of the VCO. The
relationship between the CLKIN frequency and the output frequency is dependent on SEL. The duty cycle of
the Y output signals is nominally 50%, independent of the duty cycle of the CLKIN signal.
2Y1 – 2Y3
22, 19, 16
O
These outputs transmit one-half the frequency of the VCO. The relationship between the CLKIN frequency and
the output frequency is dependent on the frequency of the output being fed back to FBIN. The duty cycle of the
Y output signals is nominally 50% independent of the duty cycle of the CLKIN signal.


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