Datasheet > 74LS670

74LS670

更新时间： 2024-11-17 22:53:19

品牌	Logo	应用领域
摩托罗拉 - MOTOROLA		输出元件
页数	文件大小	规格书
6页	205K
描述
4 x 4 REGISTER FILE WITH 3-STATE OUTPUTS

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数据手册

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74LS670 数据手册

SN54/74LS670

4 x 4 REGISTER FILE

WITH 3-STATE OUTPUTS

The TTL/MSI SN54/74LS670 is a high-speed, low-power 4 x 4 Register

File organized as four words by four bits. Separate read and write inputs, both

address and enable, allow simultaneous read and write operation.

The 3-state outputs make it possible to connect up to 128 outputs to in-

crease the word capacity up to 512 words. Any number of these devices can

be operated in parallel to generate an n-bit length.

4 x 4 REGISTER FILE

WITH 3-STATE OUTPUTS

LOW POWER SCHOTTKY

The SN54/74LS170 provides a similar function to this device but it features

open-collector outputs.

• Simultaneous Read/Write Operation

• Expandable to 512 Words by n-Bits

• Typical Access Time to 20 ns

• 3-State Outputs for Expansion

• Typical Power Dissipation of 125 mW

J SUFFIX

CERAMIC

CASE 620-09

CONNECTION DIAGRAM DIP (TOP VIEW)

N SUFFIX

PLASTIC

CASE 648-08

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

D SUFFIX

SOIC

CASE 751B-03

ORDERING INFORMATION

PIN NAMES

LOADING (Note a)

SN54LSXXXJ

Ceramic

SN74LSXXXN Plastic

SN74LSXXXD SOIC

HIGH

LOW

– D

Data Inputs

0.5 U.L.

1.0 U.L.

0.5 U.L.

1.5 U.L.

0.25 U.L.

0.5 U.L.

0.25 U.L.

0.75 U.L.

W , W

Write Address Inputs

Write Enable (Active LOW) Input

Read Address Inputs

Read Enable (Active LOW) Input

Outputs (Note b)

R , R

LOGIC SYMBOL

– Q

65 (25) U.L.

15 (7.5) U.L.

NOTES:

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

b) The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial

(74) Temperature Ranges. The Output HIGH drive factor is 25 U.L. for Military and

65 U.L. for Commercial Temperature Ranges.

FAST AND LS TTL DATA

5-597

12 3 4 5 6

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