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CDC2582PAH датащи(PDF) 5 Page - Texas Instruments

номер детали CDC2582PAH
подробное описание детали  3.3-V PHASE-LOCK LOOP CLOCK DRIVER WITH DIFFERENTIAL LVPECL CLOCK INPUTS
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CDC2582
3.3-V PHASE-LOCK LOOP CLOCK DRIVER
WITH DIFFERENTIAL LVPECL CLOCK INPUTS
SCAS379B – FEBRUARY 1993 – REVISED FEBRUARY 1996
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
CLKIN
CLKIN
44, 45
I
Clock input. CLKIN and CLKIN are the differential clock signals to be distributed by the CDC2582
clock-driver circuit. These inputs are used to provide the reference signal to the integrated PLL that
generates the clock-output signals. CLKIN and CLKIN must have a fixed frequency and fixed phase for the
PLL to obtain phase lock. Once the circuit is powered up and valid CLKIN and CLKIN signals are applied,
a stabilization time is required for the PLL to phase lock the feedback signal to its reference signal.
CLR
40
I
Clear. CLR is used to reset the VCO/4 reference frequency. CLR is negative-edge triggered and should be
strapped to VCC or GND for normal operation.
FBIN
48
I
Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hardwired to one of
the twelve clock outputs to provide frequency and phase lock. The internal PLL adjusts the output clocks
to obtain zero-phase delay between the FBIN and the differential clock input (CLKIN and CLKIN).
OE
42
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 PLL is taken directly
from an output terminal, 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 PLL obtains phase lock.
SEL1, SEL0
51, 50
I
Output configuration select.
SEL0 and SEL1 select the output configuration for each output bank
(e.g., 1
×, 1/2×, or 2×) (see Tables 1 and 2).
TEST
41
I
TEST is used to bypass the PLL 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 strapped to GND for normal operation.
1Y1 – 1Y3
2Y1 – 2Y3
3Y1 – 3Y3
2, 5, 8
12, 15, 18
22, 25, 28
O
These outputs are configured by SEL1 and SEL0 to transmit one-half or one-fourth the frequency of the
VCO. The relationship between the input clock frequency and the output frequency is dependent on SEL1
and SEL0 and the frequency of the output being fed back to FBIN. The duty cycle of the Y outputs is
nominally 50% independent of the duty cycle of the input clock signals. Each output has an internal series
resistor to dampen transmission-line effects and improve the signal integrity at the load.
4Y1 – 4Y3
32, 35, 38
O
These outputs transmit one-half the frequency of the VCO. The relationship between the input clock
frequency and the output frequency is dependent on the frequency of the output being fed back to FBIN.
The duty cycle of the Y outputs is nominally 50% independent of the duty cycle of CLKIN. Each output has
an internal series resistor to dampen transmission-line effects and improve the signal integrity at the load.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC
– 0.5 V to 4.6 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1)
– 0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state or power-off state, VO (see Note 1)
– 0.5 V to 5.5 V
. . .
Current into any output in the low state, IO
24 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, IIK (VI < 0)
– 20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, IOK (VO < 0)
– 50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum power dissipation at TA = 55°C (in still air) (see Note 2)
1.2 W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg
–65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. The maximum package power dissipation is calculated using a junction temperature of 150
°C and a board trace length of 750 mils.
For more information, refer to the
Package Thermal Considerations application note in the ABT Advanced BiCMOS Technology Data
Book, literature number SCBD002.


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