SN74ALVC7804

512

× 18

FIRST-IN, FIRST-OUT MEMORY

SCAS432 – JANUARY 1995

9

POST OFFICE BOX 655303

TYPICAL CHARACTERISTICS

0

20

40

60

80

100

120

140

0

102030405060708090

SUPPLY CURRENT

vs

CLOCK FREQUENCY

fclock – Clock Frequency – MHz

VCC = 3.6 V

VCC = 3.3 V

VCC = 3 V

fdata = 1/2 fclock

TA = 75°C

CL = 0 pF

Figure 4

calculating power dissipation

can be calculated by using:

Total power will be:

The above equations provide worst-case power calculations.

Where:

N

= number of inputs driven by TTL levels

dc

= duty cycle of inputs at a TTL high level of 3.4 V

= output capacitance load

= switching frequency of an output

= idle current, supply current when FIFO is idle

(current is due to free-running clocks)

pF