Si5341/40
Preliminary Rev. 0.9
7
Table 4. Control Input Pin Specifications
(V
DD
= 1.8 V ±5%, V
DDA
= 3.3 V ±5%, V
DDS
= 3.3 V ±5%, 1.8 V ±5%, T
A
= –40 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Si5341 Control Input Pins (I2C_SEL, IN_SEL[1:0], RST, OE, SYNC, A1, SCLK, A0/CS, FINC, FDEC)
Input Voltage
V
IL
-0.1
—
0.3xV
DDIO
*
V
V
IH
0.7xV
DDIO
1
—
3.6
V
Input Capacitance
C
IN
—
2
—
pF
Input Resistance
I
L
—
20
—
k
Minimum Pulse Width
PW
RST
50
—
—
ns
Si5340 Control Input Pins (I2C_SEL, IN_SEL[1:0], RST, OE, A1, SDA, SDI, SCLK, A0/CS)
Input Voltage
V
IL
–0.1
—
0.3xV
DDIO
*
V
V
IH
0.7xV
DDIO
*
—
3.6
V
Input Capacitance
C
IN
—
2
—
pF
Input Resistance
I
L
—
20
—
k
Minimum Pulse Width
PW
RST
50
—
—
ns
*Note:
V
DDIO
is determined by the IO_VDD_SEL bit. It is selectable as V
DDA
or V
DD
.
Table 5. Differential Clock Output Specifications
(V
DD
= 1.8 V ±5%, V
DDA
= 3.3V ±5%, V
DDO
= 1.8 V ±5%, 2.5 V ±5%, or 3.3 V ±5%, T
A
= –40 to 85 °C)
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Output Frequency
f
OUT
0.0001
—
800
MHz
Duty Cycle
DC
f < 400 MHz
48
—
52
%
400 MHz < f < 800 MHz
45
—
55
%
Output-Output Skew
T
SK
Differential Output
—
—
100
ps
OUT-OUT Skew
T
SK_OUT
Measured from the positive
to negative output pins
—
—
100
ps
Notes:
1.
Normal swing mode, high swing mode, Vswing and Cmode settings are programmable through register settings and
can be stored in NVM. Each output driver can be programmed independently.
2.
Not all combinations of voltage swing and common mode voltages settings are possible.
3.
Common mode voltage min/max variation = ±4% from typical value
4.
Driver output impedance depends on selected output mode (Normal, High).
5.
Measured for 156.25 MHz carrier frequency. Sinewave noise added to VDDO (1.8 V = 50 mVpp, 2.5 V/
3.3 V = 100 mVpp) and noise spur amplitude measured.
OUTx
OUTx
Vpp_se
Vpp_se
Vpp_diff = 2*Vpp_se
Vcm
Vcm
Vcm