Fairchild Semiconductor DM74LS377WMX, DM74LS377WM, DM74LS377N Datasheet

October 1988 Revised March 2000

DM74LS377 Octal D-Type Flip-Flop with Common Enable and Clock

General Description

The DM74LS377 is an 8-bit regist er built using advanced low power Schottky technolo gy. This register consists of eight D-type flip-flops with a buffere d common clock a nd a buffered common input enable. T he device is packaged in the space-saving (0.3 inch row spacing) 20-pin package.

Features

■ 8-bit high speed parallel registers

■ Positive edge-triggered D-type flip-flops

■ Fully buffered common clock and enable inputs

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

Logic Symbol

VCC = Pin 20 GND = Pin 10

Pin Descriptions

Connection Diagram

Truth Table

H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial

Order Number Package Number Package Description

DM74LS377WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS377N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Pin Names Description

Enable Input (Active LOW)

D0–D7 Data Inputs CP Clock Pulse Input (Active Rising Edge) Q0–Q7 Flip-Flop Outputs

Inputs Output

H X X No Change L



www.fairchildsemi.com 2

DM74LS377

Functional Description

The DM74LS377 co nsists of ei ght edge -triggered D flip-flo ps with in dividual D inputs and Q outputs. The Clock ( CP) and Enable input (E

) are common to all flip-flops.

When E

is LOW, new data is entered into the register on the next LOW-to-HIGH transition of CP. When E is HIGH, the reg-

ister will retain the present data independent of the CP.

Logic Diagram

+ 3 hidden pages