Datasheet > 74LS90

74LS90

更新时间： 2024-11-17 22:31:03

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		计数器
页数	文件大小	规格书
6页	113K
描述
DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER

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74LS90 数据手册

SN54/74LS90

SN54/74LS92

SN54/74LS93

DECADE COUNTER;

DIVIDE-BY-TWELVE COUNTER;

4-BIT BINARY COUNTER

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 transi-

tion 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 SCHOTTKY

• Low Power Consumption . . . Typically 45 mW

• High Count Rates . . . Typically 42 MHz

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

Binary

J SUFFIX

CERAMIC

CASE 632-08

• Input Clamp Diodes Limit High Speed Termination Effects

PIN NAMES

LOADING (Note a)

N SUFFIX

HIGH

LOW

PLASTIC

CASE 646-06

Clock (Active LOW going edge) Input to

÷2 Section

0.5 U.L.

1.5 U.L.

Clock (Active LOW going edge) Input to

÷5 Section (LS90), ÷6 Section (LS92)

0.5 U.L.

2.0 U.L.

1.0 U.L.

Clock (Active LOW going edge) Input to

÷8 Section (LS93)

D SUFFIX

SOIC

CASE 751A-02

MR , MR

MS , MS

Master Reset (Clear) Inputs

0.5 U.L.

10 U.L.

0.25 U.L.

5 (2.5) U.L.

Master Set (Preset-9, LS90) Inputs

Output from ÷2 Section (Notes b & c)

Outputs from ÷5 (LS90), ÷6 (LS92),

÷ 8 (LS93) Sections (Note b)

Q , Q , Q

1 3

ORDERING INFORMATION

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.

SN54LSXXJ

SN74LSXXN

SN74LSXXD

Ceramic

Plastic

SOIC

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

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

LOGIC SYMBOL

LS92

LS90

LS93

Q Q Q Q

0 1 2 3

Q Q Q Q

0 1 2 3

Q Q Q Q

0 1 2 3

1 2

8 11

12 11

= PIN 5

GND = PIN 10

NC = PINS 2, 3, 4, 13

GND = PIN 10

NC = PIN 4, 6, 7, 13

GND = PIN 10

NC = PINS 4, 13

FAST AND LS TTL DATA

5-90

12 3 4 5 6

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与74LS90相关器件

型号	品牌	获取价格	描述	数据表
74LS90A	NXP	获取价格	Decade Counter, LS Series, Asynchronous, Negative Edge Triggered, 3-Bit, Up Direction, TTL
74LS90DC	FAIRCHILD	获取价格	Decade Counter, Asynchronous, Up Direction, TTL, CDIP14,
74LS90DCQM	FAIRCHILD	获取价格	暂无描述
74LS90DCQM	ROCHESTER	获取价格	Decade Counter,
74LS90DCQR	FAIRCHILD	获取价格	暂无描述
74LS90DCQR	ROCHESTER	获取价格	Decade Counter,
74LS90F	ROCHESTER	获取价格	Decade Counter,
74LS90FC	ROCHESTER	获取价格	Decade Counter,
74LS90FCQR	ROCHESTER	获取价格	Decade Counter,
74LS90N	RAYTHEON	获取价格	Decade Counter, Asynchronous, Up Direction, TTL, PDIP14,

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