SY89871UMITR Micrel Inc, SY89871UMITR Datasheet - Page 9

• Manufacturer Part Number: SY89871UMITR
• Manufacturer: Micrel Inc

Specifications of SY89871UMITR

• Function: Clock Divider
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Package Type: MLF
• Pin Count: 16
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Not Compliant

Micrel, Inc.
Note:
1. For +2.5V systems: R1 = 250ý, R2 = 62.5ý.
Notes:
1. Power-saving alternative to Thevenin termination.
2. Place termination resistors as close to destination inputs as possible.
3. R
4. C1 is an optional bypass capacitor intended to compensate for any t
Notes:
1. Unused output (/Q) must be terminated to balance the output.
2. For +2.5V systems: R1 = 250ý, R2 = 62.5ý, R3 = 1.25ký, R4 = 1.2ký.
M9999-082407
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LVPECL OUTPUT TERMINATION RECOMMENDATIONS
b
resistor sets the DC bias voltage, equal to V
Figure 4a. Parallel Termination–Thevenin Equivalent
“source”
+3.3V
+3.3V
+3.3V
Figure 4b. Three-Resistor “Y–Termination”
/Q
T
Q
. For +3.3V systems R
+3.3V
Figure 4d. Terminating Unused I/O
R1
130Ω
R2
82Ω
V
t
Z
Z
= V
Z = 50Ω
Z = 50Ω
O
O
= 50Ω
= 50Ω
CC
Z
O
—2V
= 50Ω
R1
130Ω
50Ω
r
R2
82Ω
/t
50Ω
f
mismatches.
+3.3V
b
9
= 46ý to 50ý. For +2.5V systems R
R1
130Ω
R2
82Ω
+3.3V
R
50Ω
b
“destination”
R3
1kΩ
R1
130Ω
R2
82Ω
R4
1.6kΩ
+3.3V
V
V
t
CC
= V
V
C1 (optional)
0.01µF
t
+3.3V
CC
= V
+3.3V
—1.3V
CC
—2V
b
= 19ý.
Precision Edge
SY89871U
®