MOTOROLA SN54LS90, SN74LS90, SN54LS92, SN74LS92, SN54LS93 Technical data

PIN NAMES

74LS90

DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER

The SN54/74LS90, SN54/74LS92 and SN54/74LS93 are high-speed 4-bit ripple type counters partitioned into two sections. Each counter has a di- vide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight (LS93) section which are triggered by a HIGH-to-LOW transition on the clock inputs. Each section can be used separately or tied together (Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set (Preset 9).

•Low Power Consumption . . . Typically 45 mW

•High Count Rates . . . Typically 42 MHz

•Choice of Counting Modes . . . BCD, Bi-Quinary, Divide-by-Twelve, Binary

•Input Clamp Diodes Limit High Speed Termination Effects

LOADING (Note a)

HIGH LOW

CP0		Clock (Active LOW going edge) Input to	0.5	U.L.	1.5	U.L.
		2 Section
	1	Clock (Active LOW going edge) Input to	0.5	U.L.	2.0	U.L.
CP
		5 Section (LS90), 6 Section (LS92)
	1	Clock (Active LOW going edge) Input to	0.5	U.L.	1.0	U.L.
CP
		8 Section (LS93)
MR1, MR2		Master Reset (Clear) Inputs	0.5	U.L.	0.25	U.L.
MS1, MS2		Master Set (Preset-9, LS90) Inputs	0.5	U.L.	0.25	U.L.
Q0		Output from 2 Section (Notes b & c)	10	U.L.	5 (2.5)	U.L.
Q1, Q2, Q3		Outputs from 5 (LS90), 6 (LS92),	10	U.L.	5 (2.5)	U.L.
		8 (LS93) Sections (Note b)

NOTES:

a.1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW.

b.The Output LOW drive factor is 2.5 U.L. for Military, (54) and 5 U.L. for commercial (74)

b.Temperature Ranges.

c.The Q0 Outputs are guaranteed to drive the full fan-out plus the CP1 input of the device.

d.To insure proper operation the rise (tr) and fall time (tf) of the clock must be less than 100 ns.

															LOGIC SYMBOL
								LS90													LS92
				6		7
				1		2
					MS									14			CP0
14				CP0
1				CP										1			CP1
				1													MR Q0 Q1 Q2 Q3
					MR Q0 Q1 Q2 Q3
				1		2									1				2
				2		3		12		9	8	11			6				7		12	11	9		8
				VCC = PIN 5													VCC = PIN 5
				GND = PIN 10													GND = PIN 10
				NC = PINS 4, 13													NC = PINS 2, 3, 4, 13

SN54/74LS90

SN54/74LS92

SN54/74LS93

DECADE COUNTER;

DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER

LOW POWER SCHOTTKY

			J SUFFIX
			CERAMIC
			CASE 632-08
14	1
			N SUFFIX
			PLASTIC
14			CASE 646-06
	1
			D SUFFIX
	14		SOIC
			CASE 751A-02
		1

ORDERING INFORMATION

SN54LSXXJ Ceramic

SN74LSXXN Plastic

SN74LSXXD SOIC

LS93

14			CP0
1			CP1				Q0 Q1 Q2 Q3
			MR
			1		2
			2		3		12	9	8		11
			VCC = PIN 5
			GND = PIN 10
			NC = PIN 4, 6, 7, 13

FAST AND LS TTL DATA

5-90

SN54/74LS90 •SN54/74LS92 •SN54/74LS93

LOGIC DIAGRAM

CONNECTION DIAGRAM

LS90

DIP (TOP VIEW)

6

MS1

1

14 CP

CP

MS2

1

0

7

MR

2

13 NC

J SD Q

J SD Q

J SD Q

R SD Q

1

14

MR

3

12 Q

0

CP0

CP

CP

CP

CP

2

NC

4

11 Q3

K C

Q

K C

Q

K C

Q

S C Q

D

D

D

D

V

5

10 GND

CC

CP1

1

MS

6

9

Q

1

2

1

MR

MS

7

8

Q

2

2

1

12

9

8

11

MR2 3

Q0

Q1

Q2

Q3

NC = NO INTERNAL CONNECTION

= PIN NUMBERS

NOTE:

VCC = PIN 5

The Flatpak version has the same

GND = PIN 10

pinouts (Connection Diagram) as

the Dual In-Line Package.

LOGIC DIAGRAM

CONNECTION DIAGRAM

LS92

DIP (TOP VIEW)

CP

1

14 CP

1

0

J

Q

J

Q

J

Q

J

Q

NC

2

13 NC

14

NC 3

12 Q0

CP0

CP

CP

CP

CP

K

Q

K

Q

K

CD

Q

K

Q

NC 4

11 Q

1

CD

CD

CD

5

V

10 GND

1

CC

CP1

6

9

MR

Q

2

6

1

MR1

12

11

9

8

MR2 7

8

Q3

MR2

7

Q0

Q1

Q2

Q3

NC = NO INTERNAL CONNECTION

= PIN NUMBERS

NOTE:

VCC = PIN 5

The Flatpak version has the same

GND = PIN 10

pinouts (Connection Diagram) as

the Dual In-Line Package.

LOGIC DIAGRAM

CONNECTION DIAGRAM

LS93

DIP (TOP VIEW)

CP

1

14 CP

1

0

14

J Q

J

Q

J Q

J

Q

MR

2

13 NC

CP0

CP

CP

CP

CP

1

MR

3

12 Q

0

K C

Q

K C Q

K C

Q

K C

Q

2

D

D

D

D

NC

4

11 Q3

1

V

5

10 GND

CP

CC

1

2

NC 6

9

Q1

MR

1

12

9

8

11

MR2 3

NC 7

8 Q2

Q0

Q1

Q2

Q3

= PIN NUMBERS

NC = NO INTERNAL CONNECTION

VCC = PIN 5

NOTE:

GND = PIN 10

The Flatpak version has the same

pinouts (Connection Diagram) as

the Dual In-Line Package.

FAST AND LS TTL DATA

5-91