2

FUNCTION TABLE

H = High voltage level h = High voltage level one setup time prior to the low-to-high clock transition

L = Low voltage level l = Low voltage level one setup time prior to the low-to-high clock transition

Notes:

1. The RCO output is high when ENT is high and the counter is at terminal count HHHH.

2. The high-to-low transition of ENP or ENT should only occur while CLK is high for conventional operations.

3. The low-to-high transition of LOAD or CLR should only occur while CLK is high for conventional operations.

LOGIC DIAGRAM

Operating Mode

CLR

CLK

ENP

ENT

LOAD

DATA A,B,C,D

RCO

Reset (Clear)

l

↑

X

X

X

X

L

L

Parallel Load

↑

↑

X

X

X

X

l

l

l

h

L

H

L

1

Count

↑

h

h

h

X

Count

1

Inhibit

X

X

X

X

X

X

1

L

(2)

(1)

(9)

(7)

(10)

(3)

(4)

(5)

(6)

(14)

(12)

(13)

(11)

(15)

RCO

DATA D

DATA C

DATA B

DATA A

ENT

ENP

LOAD

CLR

CLK

C

D

Q

Q

C

D

Q

Q

C

D

Q

Q

C

D

Q

Q