OCX256LTB792 Fairchild Semiconductor, OCX256LTB792 Datasheet - Page 27

• Manufacturer Part Number: OCX256LTB792
• Manufacturer: Fairchild Semiconductor

Specifications of OCX256LTB792

• Number Of Arrays: 1
• Differential Data Transmission: Yes
• Power Supply Requirement: Single
• Mounting: Surface Mount
• Line Code: NRZ
• On-chip Buffers: Yes
• On-chip Decoder: No
• On-chip Latch Circuit: No
• On-chip Mux/demux: No
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Lead Free Status / RoHS Status: Compliant

Package and Pinout
Power Consumption
Chip power consists of three integral elements (refer to
Table 18):
1. Input Power—This element has two components:
2. Core Power—Core power is a function of data rate
a steady state component that is always ON, and
a component that is based on the number of inputs
being used.
(Mb/s) and the number of connection paths through the
switch matrix.
FIGURE 19. Power Consumption Diagram for the OCX256P using LVPECL
FIGURE 18. Power Consumption Diagram for the OCX256L using LVDS
(512mW + 6.5mW/Input
Example: Worst Case = (512mW + 1280mW) + (0.015mW x 667 x 128) + (37mW x 128)
512mW + 10mW/Input
Example: Worst Case = (512mW + 832mW) + (0.015mW x 667 x 128) + (20mW x 128)
(always ON)
(always ON)
Power
Power
(Continued)
Input
Input
+
+
0.015mW/Mbs/Connection
0.015mW/Mbs/Connection
1344mW
1792mW
Power
Power
Switch
Matrix
Switch
Matrix
Core
Core
27
3. Output Power—This element is a fixed amount for
The following diagram shows the chip power elements (as
described above), the formulas used for determining chip
power, and the total power consumption as determined by
the formula.
+
+
= 5.18 watts
= 7.81 watts
each differential output. The value is zero if the Output
Enable (OE) is disabled or set to OFF.
1280mW
1280mW
+
+
OE
OE
20mW/Output
37mW/Output
Output
Output
Power
Power
Output
Output
Buffer
Buffer
+
+
2560mW
4736mW
www.fairchildsemi.com
Preliminary