IDT5V993A_12 Datasheet, PDF (1/8 Pages) Integrated Device Technology – 3.3V PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK

IDT5V993A
3.3V PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK
COMMERCIAL AND INDUSTRIAL TEMPERATURE
RANGES
3.3V PROGRAMMABLE SKEW
IDT5V993A
PLL CLOCK DRIVER
NRND
TURBOCLOCK™
FEATURES:
• Ref input is 5V tolerant
• 3 pairs of programmable skew outputs
• Low skew: 200ps same pair, 250ps all outputs
• Selectable positive or negative edge synchronization:
Excellent for DSP applications
• Synchronous output enable
• Output frequency: 3.75MHz to 85MHz
• 2x, 4x, 1/2, and 1/4 outputs
• 3 skew grades:
IDT5V993A-2: tSKEW0<250ps
IDT5V993A-5: tSKEW0<500ps
IDT5V993A-7: tSKEW0<750ps
• 3-level inputs for skew and PLL range control
• PLL bypass for DC testing
• External feedback, internal loop filter
• 12mA balanced drive outputs
• Low Jitter: <200ps peak-to-peak
• Available in QSOP package
• Not Recommended for New Design
DESCRIPTION:
The IDT5V993A is a high fanout 3.3V 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 IDT5V993A has six
programmable skew outputs and two zero skew outputs. Skew is
controlled by 3-level input signals that may be hard-wired to appropri-
ate HIGH-MID-LOW levels.
When the GND/sOE pin is held low, all the outputs are synchro-
nously enabled. However, if GND/sOE is held high, all the outputs
except 3Q0 and 3Q1 are synchronously disabled.
Furthermore, when the VCCQ/PE is held high, all the outputs are
synchronized with the positive edge of the REF clock input. When
VCCQ/PE is held low, all the outputs are synchronized with the negative
edge of REF. Both devices have LVTTL outputs with 12mA balanced
drive outputs.
FUNCTIONAL BLOCK DIAGRAM
G N D /sO E
V C CQ /P E
REF
PLL
FB
3
FS
Skew
Select
3
3
1F1:0
Skew
Select
3
3
2F1:0
Skew
Select
3
3
3F1:0
1Q0
1Q1
2Q0
2Q1
3Q0
3Q1
4Q0
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
c 2012 Integrated Device Technology, Inc.
4Q1
JULY 2012
DSC 5408/3