5V9950PFI IDT, 5V9950PFI Datasheet - Page 3

• Manufacturer Part Number: 5V9950PFI
• Description: Clock Drivers & Distribution 3.3V Turbo Clock II Jr.
• Manufacturer: IDT
• Type: PLL Clock Driversr

Specifications of 5V9950PFI

• Multiply / Divide Factor: 1
• Output Type: LVTTL
• Max Output Freq: 200 MHz
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFP-32
• Maximum Power Dissipation: 1.1 W
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Current: 125 mA
• Part # Aliases: IDT5V9950PFI

PROGRAMMABLE SKEW
pensate for PCB trace delays, backplane propagation delays or to
accommodate requirements for special timing relationships between
clocked components. Skew is selectable as a multiple of a time unit
(t
Range and Resolution Table). There are nine skew configurations
available for each output pair. These configurations are chosen by
PROGRAMMABLE SKEW RANGE AND RESOLUTION TABLE
NOTES:
1. The device may be operated outside recommended frequency ranges without damage, but functional operation is not guaranteed.
2. The level to be set on FS is determined by the nominal operating frequency of the VCO and Time Unit Generator. The VCO frequency always appears at 1Q
3. Skew adjustment range assumes that a zero skew output is used for feedback. If a skewed Q output is used for feedback, then adjustment range will be greater. For example if a 4t
EXTERNAL FEEDBACK
ibility with regard to skew adjustment. The FB signal is compared
with the input REF signal at the phase detector in order to drive the
VCO. Phase differences cause the VCO of the PLL to adjust upwards
or downwards accordingly.
IDT5V9950
3.3V PROGRAMMABLE SKEW PLL CLOCK DRIVER TURBOCLOCK II
JR.
U
Output skew with respect to the REF input is adjustable to com-
Timing Unit Calculation (t
VCO Frequency Range (F
Skew Adjustment Range
Max Adjustment:
Example 1, F
Example 2, F
Example 3, F
Example 4, F
Example 5, F
Example 6, F
Example 7, F
when they are operated in their undivided modes. The frequency appearing at the REF and FB inputs will be the same as VCO when the output connected to FB is undivided. The frequency
of the REF and FB inputs will be 1/2 or 1/4 the VCO frequency when the part is configured for frequency multiplication by using a divided output as the FB input.
output is used for feedback, all other outputs will be skewed –4t
4 where ± 6t
) which ranges from 625ps to 1.3ns (see Programmable Skew
By providing external feedback, the IDT5V9950 gives users flex-
U
skew adjustment is possible and at the lowest F
NOM
NOM
NOM
NOM
NOM
NOM
NOM
= 25MHz
= 37.5MHz
= 50MHz
= 75MHz
= 100MHz
= 150MHz
= 200MHz
(3)
U
NOM
)
)
(1,2)
1/(32 x F
24 to 50MHz
t
t
t
U
U
U
FS = LOW
±7.8125ns
NOM
U
±18.75%
in addition to whatever skew value is programmed for those outputs. ‘Max adjustment’ range applies to output pairs 3 and
= 0.833ns
= 0.625ns
±67.5°
= 1.25ns
value.
—
—
—
—
NOM
)
3
the nF
pins, 3-level inputs (HIGH-MID-LOW) are used, they are intended for
but not restricted to hard-wiring. Undriven 3-level inputs default to
the MID level. Where programmable skew is not a requirement, the
control pins can be left open for the zero skew default setting. The
Control Summary Table shows how to select specific skew taps by
using the nF
phase detector. The loop filter transfer function has been chosen to
provide minimal jitter (or frequency variation) while still providing ac-
curate responses to input frequency changes.
An internal loop filter moderates the response of the VCO to the
48 to 100MHz
1/(16 x F
t
t
t
U
U
±7.8125ns
U
FS = MID
±37.5%
= 0.833ns
= 0.625ns
±135°
= 1.25ns
1:0
—
—
—
—
control pins. In order to minimize the number of control
NOM
1:0
)
control pins.
INDUSTRIAL TEMPERATURE RANGE
96 to 200MHz
1/(8 x F
t
t
FS = HIGH
t
U
U
±7.8125ns
U
= 0.833ns
= 0.625ns
±270°
= 1.25ns
±75%
—
—
—
—
NOM
)
1:0
, 2Q
% of Cycle Time
Phase Degrees
1:0
Comments
, and the higher outputs
ns
U
skewed