DS1609

020499 7/7

NOTES:

1. All Voltages are referenced to ground.

inputs at one power supply rail or the other when an input is tristated. The minimum driving impedance presented

to any pin is 50K

Ω. If a pin is at a logic low level, this impedance will be pulling the pin to ground. If a pin is at a

3. Standby current is measured with outputs open circuited.

internal feedback latches will pull all the pins to one power supply rail or the other.

7. Active current is measured with outputs open circuited, and inputs swinging full supply levels with one port reading

and one port writing at 100 ns cycle time. Active currents are a DC average with respect to the number of 0’s and

1’s being read or written.

8. Logic one voltages are specified at a source current of 1 mA.

9. Logic zero voltages are specified at a sink current of 4 mA.

10. Measured with a load as shown in Figure 3.

12. Recovery time is the amount of time control signals must remain high between successive cycles.

13. Typical values are at 25

°C.

LOAD SCHEMATIC Figure 3

+5 VOLTS

30 pF

D.U.T.

1.1K

Ω

680

Ω