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QS5919T70Q Datasheet

  • QS5919T70Q

  • LOW SKEW TTL PLL CLOCK DRIVER WITH INTEGRATED LOOP FILTER

  • 9頁(yè)

  • IDT

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QS5919T
LOW SKEW TTL PLL CLOCK DRIVER WITH INTEGRATED LOOP FILTER
INDUSTRIAL TEMPERATURE RANGE
LOW SKEW TTL PLL
CLOCK DRIVER WITH
INTEGRATED LOOP FILTER
FEATURES:
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5V operation
Low noise TTL level outputs
< 350ps output skew, Q
0
鈥換
4
2xQ output, Q outputs,
Q
output, Q/2 output
Outputs 3-state and reset while OE/RST low
PLL disable feature for low frequency testing
Internal loop filter RC network
Functional equivalent to Motorola MC88915
Positive or negative edge synchronization (PE)
Balanced drive outputs 鹵24mA
160MHz maximum frequency (2xQ output)
Available in QSOP and PLCC packages
QS5919T
DESCRIPTION
The QS5919T Clock Driver uses an internal phase locked loop (PLL)
to lock low skew outputs to one of two reference clock inputs. Eight outputs
are available: 2xQ, Q
0
-Q
4
, Q
5
, Q/2. Careful layout and design ensure <
350ps skew between the Q
0
-Q
4
, and Q/2 outputs. The QS5919T includes
an internal RC filter which provides excellent jitter characteristics and
eliminates the need for external components. Various combinations of
feedback and a divide-by-2 in the VCO path allow applications to be
customized for linear VCO operation over a wide range of input SYNC
frequencies. The PLL can also be disabled by the PLL_EN signal to allow
low frequency or DC testing. The LOCK output asserts to indicate when
phase lock has been achieved. The QS5919T is designed for use in high-
performance workstations, multi-board computers, networking hardware,
and mainframe systems. Several can be used in parallel or scattered
throughout a system for guaranteed low skew, system-wide clock distribu-
tion networks.
For more information on PLL clock driver products, see Application Note
AN-227.
FUNCTIONAL BLOCK DIAGRAM
REF_SEL
LO CK
SYNC
0
SYNC
1
O E/RST
0
0
1
PH A S E
D ETEC TO R
LO O P
FIL TER
1
PE
FEE DBACK
PLL_E N
FREQ _SEL
VCO
1
/2
0
R
D
R
D
R
D
R
D
R
D
R
D
R
D
Q
Q
Q
Q
Q
Q
Q
Q
Q /2
Q
5
Q
4
Q
3
Q
2
Q
1
Q
0
2xQ
INDUSTRIAL TEMPERATURE RANGE
1
c
2000
Integrated Device Technology, Inc.
SEPTEMBER 2000
DSC-5815/-

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