MM74HCT240 MM74HCT244 Inverting Octal 3-STATE Buffer Octal 3-STATE Buffer
February 1984
Revised May 2005
MM74HCT240 MM74HCT244
Inverting Octal 3-STATE Buffer Octal 3-STATE Buffer
The MM74HCT240 is an inverting buffer and the
General Description
MM74HCT244 is a non-inverting buffer. Each device has
The MM74HCT240 and MM74HCT244 3-STATE buffers
two active low enables (1G and 2G), and each enable inde-
utilize advanced silicon-gate CMOS technology and are
pendently controls 4 buffers.
general purpose high speed inverting and non-inverting
All inputs are protected from damage due to static dis-
buffers. They possess high drive current outputs which
charge by diodes to V and Ground.
CC
enable high speed operation even when driving large bus
capacitances. These circuits achieve speeds comparable
Features
to low power Schottky devices, while retaining the low
power consumption of CMOS. All three devices are TTL
TTL input compatible
input compatible and have a fanout of 15 LS-TTL equiva-
Typical propagation delay: 14 ns
lent inputs.
3-STATE outputs for connection to system buses
MM74HCT devices are intended to interface between TTL
Low quiescent current: 80 PA
and NMOS components and standard CMOS devices.
These parts are also plug-in replacements for LS-TTL High output drive current: 6 mA (min)
devices and can be used to reduce power consumption in
existing designs.
Ordering Code:
Order Number Package Number Package Description
MM74HCT240WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
MM74HCT240SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HCT240MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HCT240N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
MM74HCT244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
MM74HCT244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HCT244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HCT244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter X to the ordering code.
Connection Diagrams
Pin Assignments for DIP, SOIC, SOP and TSSOP
Top View
Top View
MM74HCT240 MM74HCT244
2005 Fairchild Semiconductor Corporation DS005365 www.fairchildsemi.comTruth Tables
MM74HCT240 MM74HCT244
1G 1A 1Y 2G 2A 2Y 1G 1A 1Y 2G 2A 2Y
LL H L L H LL LLL L
LH L L H L LH H L H H
HL Z H L Z HL Z H L Z
HH Z H H Z HH Z H H Z
H HIGH Level L LOW Level Z High Impedance
Logic Diagrams
MM74HCT240 MM74HCT244
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MM74HCT240 MM74HCT244