5V995PFGI IDT, 5V995PFGI Datasheet - Page 4

• Manufacturer Part Number: 5V995PFGI
• Description: Clock Drivers & Distribution 3.3V Turbo Clock II
• Manufacturer: IDT
• Type: PLL Clock Driversr

Specifications of 5V995PFGI

• Rohs: yes
• 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-48
• Maximum Power Dissipation: 1.9 W
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Current: 250 mA
• Part # Aliases: IDT5V995PFGI

PROGRAMMABLE SKEW
for PCB trace delays, backplane propagation delays or to accommodate
requirements for special timing relationships between clocked compo-
nents. Skew is selectable as a multiple of a time unit (t
from 625ps to 1.3ns (see Programmable Skew Range and Resolution
Table). There are nine skew configurations available for each output
pair. These configurations are chosen by the xnF
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 xFS is determined by the nominal operating frequency of the VCO and Time Unit Generator. The VCO frequency always appears at x1Q
3. Skew adjustment range assumes that a zero skew output is used for feedback. If a skewed xQ output is used for feedback, then adjustment range will be greater. For example
EXTERNAL FEEDBACK
users flexibility with regard to skew adjustment. The xFB signal is com-
pared 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 up-
wards or downwards accordingly.
IDT5V9955
3.3V PROGRAMMABLE SKEW DUAL PLL CLOCK DRIVER TURBOCLOCK W
Output skew with respect to the REF input is adjustable to compensate
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
the higher outputs when they are operated in their undivided modes. The frequency appearing at the REF and xFB inputs will be F
undivided and xDS[
output as the xFB input and setting xDS[
if a 4t
applies to output pairs 3 and 4 where ± 6t
By providing two separate external feedbacks, the IDT5V9955 gives
U
skewed output is used for feedback, all other outputs will be skewed –4t
NOM
NOM
NOM
NOM
NOM
NOM
NOM
= 100MHz
= 150MHz
= 200MHz
1:0
= 25MHz
= 37.5MHz
= 50MHz
= 75MHz
] = MM. The frequency of the REF and xFB inputs will be F
(3)
U
)
NOM
)
(1,2)
1:0
U
] = MM. Using the xDS[
skew adjustment is possible and at the lowest F
1/(32 x F
24 to 50MHz
xFS = LOW
t
t
t
U
U
±7.8125ns
±18.75%
U
1:0
= 0.833ns
= 0.625ns
±67.5°
= 1.25ns
—
—
—
—
U
control pins. In
) which ranges
NOM
1:0
] inputs allows a different method for frequency multiplication (see Divide Selection Table).
)
U
NOM
in addition to whatever skew value is programmed for those outputs. ‘Max adjustment’ range
4
/2 or F
order to minimize the number of control 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 xnF
phase detector. The loop filter transfer function has been chosen to
provide minimal jitter (or frequency variation) while still providing accu-
rate responses to input frequency changes.
An internal loop filter moderates the response of the VCO to the
1/(16 x F
48 to 100MHz
t
t
xFS = MID
t
NOM
U
U
±7.8125ns
NOM
U
±37.5%
= 0.833ns
= 0.625ns
±135°
= 1.25ns
—
—
—
—
value.
/4 when the part is configured for frequency multiplication by using a divided
NOM
)
96 to 200MHz
xFS = HIGH
1/(8 x F
t
t
t
U
U
±7.8125ns
U
INDUSTRIAL TEMPERATURE RANGE
= 0.833ns
= 0.625ns
±270°
±75%
= 1.25ns
—
—
—
—
1:0
NOM
NOM
control pins.
)
when the output connected to xFB is
% of Cycle Time
Phase Degrees
Comments
ns
1:0
, x2Q
1:0
, and