Truth Table

Outputs Inputs

WhenC2 = L WhenC2 = H

~

^A3

~

⁸³

y:;

A4

X

⁸⁴

~

^~3

~

^~4

X

^C4

X

^~3

~

^~4

lX

^C4

L L L L L L L H L L

H L L L H L L L H L

L H L L H L L L H L

H H L L L H L H H L

L L H L L H L H H L

H L H L H H L L L H

L H H L H H L L L H

H H H L L L H H L H

L L L H L H L H H L

•

H L L H H H L L L H

L H L H H H L L L H

H H L H L L H H L H

L L H H L L H H L H

H L H H H L H L H H

L H H H H L H L H H

H H H H L H H H H H

H = High Level. L = Low Level TL/F/637B-3

Note: Input conditions at A 1, 81. A2. 82. and CO are used to determine outputs I1 and I2 and the value of the internal carry C2. The values at C2. A3. 83. A4. and 84 are then used to determine outputs I3. I4. and C4.

~~L~O~9~iC~D~ia~g~r~a~m~---...

~

:5 o ...

<I:

C")

co

~

~ II)

:5 o

(14) C4

~)

~I:4

TL/F/6378-2

~ Semiconductor

^NatiOnal

Corporation

DM54LS85/DM74LS85 4-Bit Magnitude Comparators

General Description

These 4-bit magnitude comparators perform comparison of straight binary or BCD codes. Three fully-decoded decisions about two, 4-bit words (A, B) are made and are externally available at three outputs. These devices are fully expand-able to any number of bits without external gates. Words of greater length may be compared by connecting compara-tors in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits are connected to the cor-responding inputs of the next stage handling

more-signif-Connection Diagram

Dual-ln-L1ne Package DATA INPUTS

icant bits. The stage handling the least-significant bits must have a high-level voltage applied to the A = B input. The cascading path is implemented with only a two-gate-Ievel delay to reduce overall comparison times for long words.

Features

INPUT CASCADING INPUTS OUTPUTS

Function Table

See NS Package Number

J14A, M14A or N14A

Absolute Maximum Ratings

(Note)

Specifications for Military/Aerospace products are not Note: The "Absolute Maximum Ratings" are those values contained In this datasheet. Refer to the associated beyond which the safety of the device cannot be guaran-reliability electrical test specifications document. teed The device should not be operated at these limits. The Supply Voltage 7V parametric values defined in the "Electrical Characteristics"

Input Voltage 7V table are not guaranteed at the absolute maximum ratings.

The "Recommended Operating Conditions" table will define Operating Free Air Temperature Range the conditions for actual device operation.

DM54LS - 55·C to + 125·C

DM74LS O·Cto +70·C

Storage Temperature Range - 65·C to + 150·C

Recommended Operating Conditions

Symbol Parameter DM54LS85 DM74LS85

Units

Min Nom Max Min Nom Max

Vee Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

: VIH High Level Input Voltage 2 2 V

Vil Low Level Input Voltage 0.7 0.8 V

10H High Level Output Current -0.4 -0.4 rnA

10l Low Level Output Current 4 8 rnA

TA Free Air Operating Temperature -55 125 0 70

·c

Electrical Characteristics

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

Symbol Parameter Conditions Min Typ

Max Units

(Note 1)

VI Input Clamp Voltage Vee

=

^{Min, II}

=

^{-18 mA -1.5 V}

VOH High Level Output Vee

=

^{Min, 10H}

=

^{Max DM54 2.5 3.4} _V

Voltage Vil

=

^{Max, VIH}

=

^Min _{DM74 2.7 3.4}

VOL Low Level Output Vee

=

Min, IOl

=

Max DM54 0.25 0.4

Voltage Vil

=

Max, VIH

=

Min DM74 0.35 0.5 V

IOl

=

4 mA, Vee

=

Min DM74 0.25 0.4

II Input Current @ Max Vee

=

Max A<B 0.1

Input Voltage VI

=

^7V _{A>B 0.1 rnA}

Others 0.3

IIH High Level Input Vee

=

Max A<B 20

Current VI

=

2.7V A>B 20 p.A

Others 60

III Low Level Input Vee

=

Max A<B -0.4

Current VI

=

0.4V A>B -0.4 rnA

Others -1.2

los Short Circuit Vee

=

Max DM54 -20 -100

Output Current (Note 2) DM74 -20 -100 mA

Icc Supply Current Vee

=

Max (Note 3) 10 20 rnA

Note 1: All typicals are at Vcc = ^{5V, T A} = ^25°C.

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

Is measured with all outputs open, A = grounded and all other inputs at

Switching Characteristics

at Vee = 5V and T A = 25°C (See Section 1 for Test Waveforms and Output Load)

From To Number of RL = 2 kO

Symbol Parameter Input Output Gate Levels CL = 15 pF CL = 50 pF Units

Min Max Min Max

tpLH Propagation Delay Time Any Aor B A < B,

3 36 42

Low-to-High Level Output Data Input A>B ns

A=B 4 40 40

tpHL Propagation Delay Time Any Aor B A < B,

3 30 40

High-to-Low Level Output Data Input A>B ns

A=B 4 30 40

tpLH Propagation Delay Time A<B

A>B 1 22 26

Low-to-High Level Output orA = B ns

tpHL Propagation Delay Time A<B

A>B 1 17 26

High-to-Low Level Output orA = B ns

tpLH Propagation Delay Time

A=B A=B 2 20 25 ns

Low-to-High Level Output tpHL Propagation Delay Time

A=B A=B 2 17 26 ns

High-to-Low Level Output

tpLH Propagation Delay Time A>B

A<B 1 22 26

Low-to-High Level Output orA = B ns

tpHL Propagation Delay Time A>B

A<B 1 17 26

High-to-Low Level Output orA = B ns

c 3:

U1

~

r-en co

U1 ...

c 3:

""

~

r-en co

U1

~ r---~

(f)

co

....I

~

r....

::E c

...

co

~ (f) ....I

~ ~

::E c

Logic Diagram

A3(15) B3 (1)

A2 (13) B2 (14)

~---L~r--~---~~,~~--- ~ r;:::::

(2)

A < B ...:.:.:H___l4_----H_++---..,f-4-+

4-+

4~---~----___, A=B~(~3)H___l4_----H_++---_f_++;_----~~----~3

~---4__----~~

A > B ....:(..:.:4)+-+___l4_--~H_++---_f_++_f_,

A1 (12) B1 (11)

~

...

4-+---:..-:.-:.-::~=D_=I

~---4--~~--~~'r~ ~

(10) ~

~g -(-9)+----+-L-I»-1--~

~---~~

(5) A>B

(6) A=B

(7) A<B

TL/F/6379-2

~

^NatiOnal

Semiconductor Corporation

DM54LS86/DM74LS86 Quad 2-lnput Exclusive-OR Gates

General Description

This device contains four independent gates each of which performs the logic exclusive-OR function:

Connection Diagram

Dual-In-Llne Package

Vee 84 Y4 83 A3 Y3

11

3

A1 81 Y1 A2 82 Y2 GND

TL/F/6380-1 Order Number DM54LS86J, DM74LS86M or DM74LS86N

Function Table

See NS Package Number J14A, M14A or N14A

Y = A ED B = AB

+

AS Inputs

A B

L L

L H

H L

H H

H = High Logic Level L = Low Logic Level

Output Y L H H L

Absolute Maximum Ratings

(Note)

Specifications for Military/Aerospace products are not Note: The "Absolute Maximum Ratings" are those values contained In this data sheet. Refer to the associated beyond which the safety of the device cannot be guaran-reliability electrical test specifications document. teed The device should not be operated at these limits. The Supply Voltage 7V parametric values defined in the "Electrical Characteristics"

Input Voltage 7V table are not guaranteed at the absolute maximum ratings.

The "Recommended Operating Conditions" table will define Operating Free Air Temperature Range the conditions for actual device operation.

DM54LS - 55°C to

+

125°C

DM74LS O°C to

+

70°C

Storage Temperature Range - 65°C to

+

150°C

Recommended Operating Conditions

Symbol Parameter DM54LS86 DM74LS86

Units

Min Nom Max Min Nom Max

Vee Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

VIH High Level Input Voltage 2 2 V

VIL Low Level Input Voltage 0.7 0.8 V

10H High Level Output Current -0.4 -0.4 mA

10L Low Level Output Current 4 8 mA

TA

Free Air Operating Temperature -55 125 0 70 °C

Electrical Characteristics

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

Symbol Parameter Conditions Min Typ

Max Units (Note 1)

VI Input Clamp Voltage Vee

=

Min, II

=

-18 mA -1.5 V

VOH High Level Output Vee

=

Min, 10H

=

Max, DM54 2.5 3.4

Voltage VIL

=

Max, VIH

=

Min DM74 2.7 3.4 V

VOL Low Level Output Vee

=

Min, 10l

=

Max, DM54 0.25 0.4

Voltage VIL

=

Max, VIH

=

Min DM74 0.35 0.5 V

10L

=

4 mA, Vee

=

Min DM74 0.25 0.4

II Input Current @ Max Vee

=

Max, VI

=

7V

0.2 mA

Input Voltage

IIH High Level Input Current Vee

=

Max, VI

=

2.7V 40 IlA

IlL Low Level Input Current Vee

=

Max, VI

=

O.4V -0.6 mA

los Short Circuit Vee

=

Max DM54 -20 -100

Output Current (Note 2) DM74 -20 -100 mA

IceH Supply Current with Vee

=

Max

6.1 10 mA

Outputs High (Note 3)

Icel Supply Current with Vee

=

Max

9 15 mA

Outputs Low (Note 4)

Note 1: All typicals are at VCC = 5V, TA = 25'C.

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

Note 3: ICCH is measured with all outputs open, one input at each gate at 4.5V, and the other inputs grounded.

Note 4: ICCl is measured with all outputs open and all inputs grounded.

Switching Characteristics

^{at Vee =} 5V and T A = 25°C (See Section 1 for Test Waveforms and Output Load) RL = 2 k!1

Symbol Parameter Conditions CL = 15 pF CL = 50 pF Units

Min Max Min Max

tPLH Propagation Delay Time

Other 18 23 ns

Low to High Level Output

Input

tpHL Propagation Delay Time Low

17 21 ns

High to Low Level Output tpLH Propagation Delay Time

Other 10 15 ns

Low to High Level Output

Input

tpHL Propagation Delay Time High

12 15 ns

High to Low Level Output

~

,---,

~ Semiconductor

^NatiOnal

Corporation

DM54LS90/DM74LS90, DM54LS93/DM74LS93 Decade and Binary Counters

General Description

Each of these monolithic counters contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is by-five for the LS90 and divide-by-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 com-plement applications.

To use their maximum cOunt length (decade or four bit bina-ry), the B input is connected to the QA output. The input

Connection Diagrams

(Dual-In-Line Packages)

INPUT

Order Number DM54LS90J, DM74LS90M or DM74LS90N See NS Package Number J14A, M14A or N14A

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

Order Number DM54LS93J, DM74LS93M or DM74LS93N See NS Package Number J14A, M14A or N14A

Absolute Maximum Ratings

^(Note)

Specifications for Military I Aerospace products are not Note: The "Absolute Maximum Ratings" are those values contained In this datasheet. Refer to the associated beyond which the safety of the device cannot be guaran-reliability electrical test specifications document. teed The device should not be operated at these limits. The Supply Voltage 7V parametric values defined in the "Electrical Characteristics"

Input Voltage (Reset) 7V table are not guaranteed at the absolute maximum ratings.

The "Recommended Operating Conditions" table will define Input Voltage (A or B) 5.5V the conditions for actual device operation.

Operating Free Air Temperature Range

DM54LS - 55°C to

+

^125°C

DM74LS O°Cto +70°C

Storage Temperature Range - 65°C to

+

150°C

Recommended Operating Conditions

Symbol Parameter DM54LS90 DM74LS90

Units

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

Symbol Parameter Conditions Min Typ

Max Units

Dans le document Semiconductor Corporation (Page 143-153)