DM74LS670MX 查看數據表（PDF） - Fairchild Semiconductor

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DM74LS670MX

3-STATE 4-by-4 Register File

Fairchild Semiconductor 

Absolute Maximum Ratings(Note 4)

Supply Voltage

7V

Input Voltage

7V

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range

−65°C to +150°C

Note 4: The “Absolute Maximum Ratings” are those values beyond which

the safety of the device cannot be guaranteed. The device should not be

operated at these limits. The parametric values defined in the Electrical

Characteristics tables are not guaranteed at the absolute maximum ratings.

The “Recommended Operating Conditions” table will define the conditions

for actual device operation.

Recommended Operating Conditions

Symbol

Parameter

Min

Nom

Max

Units

VCC

Supply Voltage

4.75

5

5.25

V

VIH

HIGH Level Input Voltage

2

V

VIL

LOW Level Input Voltage

0.8

V

IOH

HIGH Level Output Current

−2.6

mA

IOL

LOW Level Output Current

24

mA

tW

Write Enable Pulse Width (Note 5)

25

ns

tSU

Setup Time

Data

10

ns

(Note 5)(Note 6)

WA, WB

15

tH

Hold Time

Data

15

ns

(Note 5)(Note 6)

WA, WB

5

tLATCH

Latch Time for New Data (Note 5)(Note 7)

25

ns

TA

Free Air Operating Temperature

0

70

°C

Note 5: TA = 25°C and VCC = 5V.

Note 6: Times are with respect to the Write-Enable input. Write-Select time will protect the data written into the previous address. If protection of data in the

previous address, tSETUP (WA, WB) can be ignored. As any address selection sustained for the final 30 ns of the Write-Enable pulse and during tH (WA, WB)

will result in data being written into that location. Depending on the duration of the input conditions, one or a number of previous addresses may have been

written into.

Note 7: Latch time is the time allowed for the internal output of the latch to assume the state of new data. This is important only when attempting to read from

a location immediately after that location has received new data.

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