ADC78H89 Timing Specifications

The following specifications apply for AV

T

Symbol

Parameter

Conditions

Typical

Limits

Units

t

1a

SCLK High to CS Fall Setup Time

(Note 10)

10

ns (min)

t

1b

SCLK Low to CS Fall Hold Time

(Note 10)

10

ns (min)

t

2

Delay from CS Until DOUT

30

ns (max)

t

3

Data Access Time after SCLK

Falling Edge

30

ns (max)

t

4

Data Setup Time Prior to SCLK

Rising Edge

10

ns (max)

t

5

Data Valid SCLK Hold Time

10

ns (max)

t

6

SCLK High Pulse Width

0.4 x

t

SCLK

ns (min)

t

7

SCLK Low Pulse Width

0.4 x

t

SCLK

ns (min)

t

8

CS Rising Edge to DOUT

High-Impedance

20

ns (max)

Note 1: Absolute maximum ratings are limiting values which indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions

for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical

Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not

operated under the listed test conditions.

Note 2: All voltages are measured with respect to GND = 0V, unless otherwise specified.

The 50 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 10 mA to five.

junction-to-ambient thermal resistance (

for maximum power dissipation listed above will be reached only when the ADC78H89 is operated in a severe fault condition (e.g. when input or output pins are

driven beyond the power supply voltages, or the power supply polarity is reversed). Obviously, such conditions should always be avoided.

Note 5: Human body model is 100 pF capacitor discharged through a 1.5 k

Ω resistor. Machine model is 220 pF discharged through ZERO ohms.

Note 6: See AN450, “Surface Mounting Methods and Their Effect on Product Reliability”, or the section entitled “Surface Mount” found in any post 1986 National

Semiconductor Linear Data Book, for other methods of soldering surface mount devices.

Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 8: Data sheet min/max specification limits are guaranteed by design, test, or statistical analysis.

Note 9: Except power supply pins.

www.national.com

5