SN54LS224A, SN74LS224A

16

× 4 SYNCHRONOUS FIRST-IN, FIRST-OUT MEMORIES

WITH 3-STATE OUTPUTS

SDLS023E – JANUARY 1991 – REVISED APRIL 2003

5

POST OFFICE BOX 655303

timing diagram

Invalid

W1

W2

W1

W2

W15

W16

Invalid

Word 1

Word 2

Word 1

Word 2

CLR

LDCK

IR

UNCK

D0–D3

OR

Q0–Q3

Load

Two Words

Unload

Two Words

Load Until Full

Unload

Initialize

–0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–0.5 V to 7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–0.5 V to 5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

67

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package (see Note 3)

88

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. All voltage values are with respect to GND.

2. The package thermal impedance is calculated in accordance with JESD 51-7.

3. The package thermal impedance is calculated in accordance with JESD 51-3.