SM844256 Datasheet, PDF (5/8 Pages) Micrel Semiconductor – 10 Gigabit Ethernet and SONET, 6 Output, Ultra-Low Jitter LVDS Frequency Synthesizer

Micrel, Inc.
LVDS DC Electrical Characteristics^{(5, 6, 7)}
V_DDA = V_DD = 3.3V ±5% or 2.5V ±5%, V_DDO = 2.5V or 3.3V ±5%, T_A = –40°C to +85°C, unless noted.
Symbol Parameter
Condition
Min
Typ
V_OD
Differential Output Voltage
Figure 1
275
350
ΔV_OD
V_OD Magnitude Change
V_OS
Offset Voltage
1.15
1.25
ΔV_OS
V_OS Magnitude Change
SM844256
Max Units
475 mV
40
mV
1.50
V
50
mV
LVCMOS DC Electrical Characteristics⁽⁶⁾
V_DDA = V_DD = 3.3V ±5% or 2.5V ±5%, V_DDO = 2.5V or 3.3V ±5%, T_A = –40°C to +85°C, unless noted.
Symbol Parameter
Condition
Min
Typ
V_IH
Input High Voltage
2
V_IL
Input Low Voltage
I_IH
Input High Current (FB_SEL)
V_DD = V_IN = 3.465V
I_IH
Input High Current (PLL_BYPASS),
V_DD = V_IN = 3.465V
(N_SEL0), (NSEL1)
I_IL
Input Low Current (FB_SEL)
V_DD = 3.465V, V_IN = 0V
I_IL
Input Low Current (PLL_BYPASS),
V_DD = 3.465V, V_IN = 0V
(N_SEL0), (NSEL1)
-0.3
-5
-150
Max
V_DD
+0.3
0.8
150
5
Units
V
V
μA
μA
μA
μA
AC Electrical Characteristics⁽⁸⁾
V_DDA = V_DD = 3.3V ±5% or 2.5V ±5%, V_DDO = 2.5V or 3.3V ±5%, T_A = –40°C to +85°C, unless noted.
Symbol Parameter
Condition
Min Typ Max Units
F_OUT
Output Frequency
Refer to Frequency Table
75
625 MHz
T_jit(∅)
RMS Phase Jitter (Random)
125MHz, Integration Range:
(1.875MHz – 20MHz)
80
fs
T_SKEW
Output-to-Output Skew
Note 9
65
ps
T_R/T_F
LVDS Output Rise/Fall Time
20% – 80%
100 160 300
ps
ODC
Output Duty Cycle
45
50
55
%
T_LOCK
PLL Lock Time
20
ms
Notes:
5. See Figure 4 for load test circuit example.
6. The circuit is designed to meet the DC specifications shown in the above table(s) after thermal equilibrium has been established.
7. Outputs terminated 100Ω between Q and /Q. All unused outputs must be terminated.
8. The circuit is designed to meet the AC specifications shown in the above table(s) after thermal equilibrium has been established.
9. Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at the output differential crossing points.
July 2010
5
M9999-072110-B