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A1225A-1VQ160C Datasheet(PDF) 10 Page - Microsemi Corporation |
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A1225A-1VQ160C Datasheet(HTML) 10 Page - Microsemi Corporation |
10 / 54 page Detailed Specifications 2- 4 R e v ision 8 Static Power Component Microsemi FPGAs have small static power components that result in lower power dissipation than PALs or PLDs. By integrating multiple PALs/PLDs into one FPGA, an even greater reduction in board-level power dissipation can be achieved. The power due to standby current is typically a small component of the overall power. Standby power is calculated in Table 2-5 for commercial, worst case conditions. The static power dissipated by TTL loads depends on the number of outputs driving high or low and the DC load current. Again, this value is typically small. For instance, a 32-bit bus sinking 4 mA at 0.33 V will generate 42 mW with all outputs driving low, and 140 mW with all outputs driving high. The actual dissipation will average somewhere between as I/Os switch states with time. Active Power Component Power dissipation in CMOS devices is usually dominated by the active (dynamic) power dissipation. This component is frequency dependent, a function of the logic and the external I/O. Active power dissipation results from charging internal chip capacitances of the interconnect, unprogrammed antifuses, module inputs, and module outputs, plus external capacitance due to PC board traces and load device inputs. An additional component of the active power dissipation is the totem-pole current in CMOS transistor pairs. The net effect can be associated with an equivalent capacitance that can be combined with frequency and voltage to represent active power dissipation. Equivalent Capacitance The power dissipated by a CMOS circuit can be expressed by EQ 3. Power (µW) = CEQ * VCC2 * F EQ 3 Where: CEQ is the equivalent capacitance expressed in pF. VCC is the power supply in volts. F is the switching frequency in MHz. Equivalent capacitance is calculated by measuring ICC active at a specified frequency and voltage for each circuit component of interest. Measurements have been made over a range of frequencies at a fixed value of VCC. Equivalent capacitance is frequency independent so that the results may be used over a wide range of operating conditions. Equivalent capacitance values are shown in Table 2-6. Table 2-5 • Standby Power Calculation ICC VCC Power 2 mA 5.25 V 10.5 mW Table 2-6 • CEQ Values for Microsemi FPGAs Item CEQ Value Modules (CEQM) 5.8 Input Buffers (CEQI) 12.9 Output Buffers (CEQO) 23.8 Routed Array Clock Buffer Loads (CEQCR)3.9 |
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