NSC DM74LS93N, DM74LS93M, DM74LS90N, DM74LS90M Datasheet

DM74LS90/DM74LS93
Decade and Binary Counters

General Description

Each of these monolithic counters contains four master­slave flip-flops and additional gating to provide a divide-by­two counter and a three-stage binary counter for which the
count cycle length is divide-by-five for the ’LS90 and divide­by-eight for the ’LS93.

All of these counters have a gated zero reset and the LS90
also has gated set-to-nine inputs for use in BCD nine’s com­plement applications.

To use their maximum count length (decade or four bit bina­ry), the B input is connected to the Q

Connection Diagrams (Dual-In-Line Packages)

output. The input

A

June 1989

count pulses are applied to input A and the outputs are as
described in the appropriate truth table. A symmetrical di­vide-by-ten count can be obtained from the ’LS90 counters
by connecting the Q
input count to the B input which gives a divide-by-ten square
wave at output Q

output to the A input and applying the

D

.

A

Features

Y

Typical power dissipation 45 mW

Y

Count frequency 42 MHz

DM74LS90/DM74LS93 Decade and Binary Counters

Order Number DM74LS90M or DM74LS90N

See NS Package Number M14A or N14A

C

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/6381

TL/F/6381– 1

Order Number DM74LS93M or DM74LS93N

See NS Package Number M14A or N14A

TL/F/6381– 2

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage (Reset) 7V

Input Voltage (A or B) 5.5V

Operating Free Air Temperature Range

DM74LS 0

Storage Temperature Range

Ctoa70§C

§

b

65§Ctoa150§C

Recommended Operating Conditions

Symbol Parameter

V

CC

V

IH

V

IL

I

OH

I

OL

f

CLK

f

CLK

t

W

t

W

t

REL

t

REL

T

A

e

Note 1: C

L

e

Note 2: C

L

Supply Voltage 4.75 5 5.25 V

High Level Input Voltage 2 V

Low Level Input Voltage 0.8 V

High Level Output Current

Low Level Output Current 8 mA

Clock Frequency (Note 1) A to Q

BtoQ

Clock Frequency (Note 2) A to Q

BtoQ

Pulse Width (Note 1) A 15

B30 ns

Reset 15

Pulse Width (Note 2) A 25

B50 ns

Reset 25

Reset Release Time (Note 1) 25 ns

Reset Release Time (Note 2) 35 ns

Free Air Operating Temperature 0 70

15 pF, R

50 pF, R

e

L

e

L

2kX,T

2kX,T

e

A

e

A

25§C and V

25§C and V

e

5V.

CC

e

5V.

CC

Note:

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’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.

DM74LS90

Min Nom Max

b

0.4 mA

A

B

A

B

032

016

020

010

Units

MHz

MHz

C

§

’LS90 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

e

V

I

V

OH

V

OL

I

I

Input Clamp Voltage V

High Level Output V
Voltage V

Low Level Output V
Voltage V

Input Current@Max V
Input Voltage

CC

CC

e

IL

CC

e

IL

(Note 4)

e

I

OL

CC

V

CC

e

V

I

eb

Min, I

e

Min, I

Max, V

e

Min, I

Max, V

4 mA, V

e

Max, V

e

Max A 0.2 mA

5.5V

18 mA

I

e

Max

OH

e

Min

IH

e

Max

OL

e

Min 0.35 0.5

IH

e

Min 0.25 0.4

CC

e

7V Reset 0.1

I

2.7 3.4 V

B 0.4

2

Typ

(Note 1)

Max Units

b

1.5 V

V

’LS90 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) (Continued)

Symbol Parameter Conditions Min

I

IH

High Level Input V
Current

CC

e

Max, V

e

2.7V Reset 20

I

A40mA

B80

I

IL

Low Level Input V
Current

CC

e

Max, V

e

0.4V Reset

I

A

B

I

OS

I

CC

Note 1: All typicals are at V

Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Note 3: I

Note 4: Q

Short Circuit V
Output Current

Supply Current V

e

e

5V, T

CC

is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V and all other inputs grounded.

CC

outputs are tested at I

A

25§C.

A

e

Max plus the limit value of IILfor the B input. This permits driving the B input while maintaining full fan-out capability.

OL

e

Max (Note 2)

CC

e

Max (Note 3) 9 15 mA

CC

b

20

’LS90 Switching Characteristics

e

at V

CC

5V and T

Symbol Parameter

f

MAX

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PHL

e

25§C (See Section 1 for Test Waveforms and Output Load)

A

From (Input)

To (Output)

Maximum Clock A to Q
Frequency

Propagation Delay Time
Low to High Level Output

Propagation Delay Time
High to Low Level Output

Propagation Delay Time
Low to High Level Output

Propagation Delay Time
High to Low Level Output

Propagation Delay Time
Low to High Level Output

Propagation Delay Time
High to Low Level Output

Propagation Delay Time
Low to High Level Output

Propagation Delay Time
High to Low Level Output

Propagation Delay Time
Low to High Level Output

Propagation Delay Time
High to Low Level Output

BtoQ

AtoQ

AtoQ

AtoQ

AtoQ

BtoQ

BtoQ

BtoQ

BtoQ

BtoQ

BtoQ

A

B

A

A

D

D

B

B

C

C

D

D

Propagation Delay Time SET-9 to
Low to High Level Output QA,Q

D

Propagation Delay Time SET-9 to
High to Low Level Output Q

B,QC

Propagation Delay Time SET-0 to
High to Low Level Output Any Q

e

R

2kX

e

C

L

L

15 pF C

Min Max Min Max

32 20

16 10

16 20 ns

18 24 ns

48 52 ns

50 60 ns

16 23 ns

21 30 ns

32 37 ns

35 44 ns

32 36 ns

35 44 ns

30 35 ns

40 48 ns

40 52 ns

Typ

(Note 1)

L

Max Units

b

0.4

b

2.4 mA

b

3.2

b

100 mA

e

50 pF Units

MHz

3