3 Pin Configuration and Functions

Figure 3-1. Terminal Assignment

Pin Functions

PIN

TYPE1

DESCRIPTION

NO.

NAME

1

SO

I

Mode select 0

2

!OE1

I

Output enable, active low

3

!OE2

I

Output enable, active low

4

I/O6

O

Parallel data input/output

5

I/O4

O

Parallel data input/output

6

I/O2

O

Parallel data input/output

7

I/O0

O

Parallel data input/output

8

Q0

O

Serial output

9

!MR

I

Master reset, active low

10

GND

-

Ground

11

DSO

I

Serial data input

12

CP

I

Clock, rising edge triggered

13

I/O1

O

Parallel data input/output

14

I/O3

O

Parallel data input/output

15

I/O5

O

Parallel data input/output

16

I/O7

O

Parallel data input/output

17

Q7

O

Serial output

18

DS7

I

Serial data input

19

S1

I

Mode select

20

VCC

-

Supply

(1)

Signal Types: I = Input, O = Output, I/O = Input or Output

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CD54AC299, CD74AC299, CD74AC323, CD54ACT299, CD74ACT299

SCHS288A – DECEMBER 1998 – REVISED DECEMBER 2024

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