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IDT5991A Datasheet

  • IDT5991A

  • PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK

  • 8頁

  • IDT

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IDT5991A
PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
PROGRAMMABLE SKEW
PLL CLOCK DRIVER
TURBOCLOCK鈩?/div>
鈥?4 pairs of programmable skew outputs
鈥?Low skew: 200ps same pair, 250ps all outputs
鈥?Selectable positive or negative edge synchronization:
Excellent for DSP applications
鈥?Synchronous output enable
鈥?Output frequency: 3.75MHz to 100MHz
鈥?2x, 4x, 1/2, and 1/4 outputs
鈥?5V with TTL outputs
鈥?3 skew grades:
IDT5991A-2: t
SKEW0
<250ps
IDT5991A-5: t
SKEW0
<500ps
IDT5991A-7: t
SKEW0
<750ps
鈥?3-level inputs for skew and PLL range control
鈥?PLL bypass for DC testing
鈥?External feedback, internal loop filter
鈥?46mA I
OL
high drive outputs
鈥?Low Jitter: <200ps peak-to-peak
鈥?Outputs drive 50鈩?terminated lines
鈩?/div>
鈥?Pin-compatible with Cypress CY7B991
鈥?Available in PLCC Package
IDT5991A
FEATURES:
DESCRIPTION:
The IDT5991A is a high fanout PLL based clock driver intended for
high performance computing and data-communications applications. A
key feature of the programmable skew is the ability of outputs to lead or
lag the REF input signal. The IDT5991A has eight programmable skew
outputs in four banks of 2. Skew is controlled by 3-level input signals
that may be hard-wired to appropriate HIGH-MID-LOW levels.
The IDT5991A maintains Cypress CY7B991 compatibility while pro-
viding two additional features: Synchronous Output Enable (GND/sOE),
and Positive/Negative Edge Synchronization (V
CCQ
/PE). When the GND/
sOE
pin is held low, all the outputs are synchronously enabled (CY7B991
compatibility). However, if GND/sOE is held high, all the outputs except
3Q0 and 3Q1 are synchronously disabled.
Furthermore, when the V
CCQ
/PE is held high, all the outputs are syn-
chronized with the positive edge of the REF clock input (CY7B991 com-
patibility). When V
CCQ
/PE is held low, all the outputs are synchronized
with the negative edge of REF.
FUNCTIONAL BLOCK DIAGRAM
G ND/sO E
Skew
Select
3
3
1F1:0
V
CCQ
/PE
Skew
Select
REF
PLL
FB
3
FS
Skew
Select
3
3
3F1:0
3
3
2F1:0
1Q
0
1Q
1
2Q
0
2Q
1
3Q
0
3Q
1
Skew
Select
3
3
4F1:0
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
4Q
0
4Q
1
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
c
2001
Integrated Device Technology, Inc.
AUGUST 2001
DSC 5843/1

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