XRK49911 Datasheet, PDF (7/12 Pages) Exar Corporation – 3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER

xr
REV. 1.0.1
XRK49911
3.3V HIGH-SPEED (110 MHZ) PROGRAMMABLE SKEW CLOCK BUFFER
ELECTRICAL CHARACTERISTICS OVER THE 3.3V + 10% OPERATING RANGE
SYMBOL
DESCRIPTION
MIN
I_{OS Short Circuit Current} ^[5]
I_CCQ
Operating Current Used by Inter- Com’l
nal Circuitry
Ind
MAX
-200
95
100
UNIT
CONDITION
mA V_CC = Max,
V_OUT = GND (25° only)
mA V_CCN = V_CCQ = Max.,
All Inputs Selects Open
I_{CCN Output Buffer Current per Output Pair} ^[6]
PD _{Power Dissipation per Output Pair} ^[7]
19
mA V_CCN = V_CCQ = Max.,
I_OUT = 0 mA
Inputs Selects Open, f_MAX
104
mW V_CCN = V_CCQ = Max.,
I_OUT = 0 mA
Input Selects Open, f_MAX
CAPACITANCE^[8]
SYMBOL
DESCRIPTION
C_IN Input Capacitance
MAX.
10
UNIT
pF
CONDITION
T_A = 25°C,
f=1MHz, V_CC=3.3V
NOTES:
4. These inputs are normally wired to V_CC, GND or left unconnected (actual threshold voltages vary as a percentage
of V_CC). Internal termination resistors hold unconnected inputs at V_CC/2. If these inputs are switched, the function
and timing of the outputs may glitch and the PLL may require an additional t_LOCK time before all data sheet limits
are achieved.
5. XRK49911 should be tested one output at a time, output shorted for less than one second, less than 10% duty
cycle. Room temperature only.
6. Total output current per output pair can be approximated by the following expression that includes device current
plus load current:
XRK49911: I_CCN = {(4+0.11F) + [(835-3F)/Z + (.0022FC)]N} x 1.1
Where:
F = frequency in MHz
C = capacitive load in pF
Z = line impedance in ohms
N = number of loaded outputs; 0, 1, or 2
7. Total power dissipation per output pair can be approximated by the following expression that includes device
power dissipation plus power dissipation due to the load circuit:
PD = {(22 + 0.61F) + [(1550 + 2.7F)/Z) + .0125FC]N} x 1.1
See note 6 for variable definition.
8. Applies to CLKIN and FB_IN inputs only.
7