May 1995
54F/74F240#54F/74F241#54F/74F244
Octal Buffers/Line Drivers with TRI-STATEÉ Outputs
General Description
The 'F240, 'F241 and 'F244 are octal buffers and line drivers designed to be employed as memory and address drivers, clock drivers and bus-oriented transmitters/receivers which provide improved PC and board density.
Features
Y TRI-STATE outputs drive bus lines or buffer memory address registers
YOutputs sink 64 mA (48 mA mil)
Y12 mA source current
YInput clamp diodes limit high-speed termination effects
YGuaranteed 4000V minimum ESD protection
Commercial |
Military |
Package |
Package Description |
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Number |
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74F240PC |
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N20A |
20-Lead (0.300× Wide) Molded Dual-In-Line |
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54F240DM (Note 2) |
J20A |
20-Lead Ceramic Dual-In-Line |
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74F240SC (Note 1) |
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M20B |
20-Lead (0.300× Wide) Molded Small Outline, JEDEC |
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74F240SJ (Note 1) |
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M20D |
20-Lead (0.300× Wide) Molded Small Outline, EIAJ |
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54F240FM (Note 2) |
W20A |
20-Lead Cerpack |
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54F240LM (Note 2) |
E20A |
20-Lead Ceramic Leadless Chip Carrier, Type C |
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74F241PC |
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N20A |
20-Lead (0.300× Wide) Molded Dual-In-Line |
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54F241DM (Note 2) |
J20A |
20-Lead Ceramic Dual-In-Line |
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74F241SC (Note 1) |
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M20B |
20-Lead (0.300× Wide) Molded Small Outline, JEDEC |
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74F241SJ (Note 1) |
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M20D |
20-Lead (0.300× Wide) Molded Small Outline, EIAJ |
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54F241FM (Note 2) |
W20A |
20-Lead Cerpack |
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54F241LM (Note 2) |
E20A |
20-Lead Ceramic Leadless Chip Carrier, Type C |
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74F244PC |
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N20A |
20-Lead (0.300× Wide) Molded Dual-In-Line |
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54F244DM (Note 2) |
J20A |
20-Lead Ceramic Dual-In-Line |
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74F244SC (Note 1) |
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M20B |
20-Lead (0.300× Wide) Molded Small Outline, JEDEC |
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74F244SJ (Note 1) |
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M20D |
20-Lead (0.300× Wide) Molded Small Outline, EIAJ |
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74F244MSA (Note 1) |
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MSA20 |
20-Lead Molded Shrink Small Outline, EIAJ Type II |
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54F244FM (Note 2) |
W20A |
20-Lead Cerpack |
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54F244LM (Note 2) |
E20A |
20-Lead Ceramic Leadless Chip Carrier, Type C |
Note 1: Devices also available in 13× reel. Use Suffix e SCX, SJX and MSAX.
Note 2: Military grade device with environmental and burn-in processing. Use suffix e DMQB, FMQB and LMQB.
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
STATE-TRI with Drivers Buffers/Line Octal |
54F/74F244#54F/74F241#54F/74F240 |
Outputs |
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C1995 National Semiconductor Corporation |
TL/F/9501 |
RRD-B30M75/Printed in U. S. A. |
Connection Diagrams
Pin Assignment for LCC
'F240 |
'F241 |
'F244 |
TL/F/9501 ± 6
TL/F/9501 ± 2 |
TL/F/9501 ± 4 |
Pin Assignment for DIP, SOIC, SSOP and Flatpak
TL/F/9501 ± 1 |
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TL/F/9501 ± 3 |
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TL/F/9501 ± 5 |
Logic Symbols |
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IEEE/IEC |
IEEE/IEC |
IEEE/IEC |
'F240 |
'F241 |
'F244 |
TL/F/9501 ± 7 |
TL/F/9501 ± 8 |
TL/F/9501 ± 9 |
2
Unit Loading/Fan Out
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54F/74F |
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Pin Names |
Description |
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U.L. |
Input IIH/IIL |
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HIGH/LOW |
Output IOH/IOL |
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20 mA/b1 mA |
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OE1, OE2 |
TRI-STATE Output Enable Input (Active LOW) |
1.0/1.667 |
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OE2 |
TRI-STATE Output Enable Input (Active HIGH) |
1.0/1.667 |
20 mA/b1 mA |
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I0 ± I7 |
Inputs ('F240) |
1.0/1.667* |
20 mA/b1 mA |
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I0 ± I7 |
Inputs ('F241, 'F244) |
1.0/2.667* |
20 mA/b1.6 mA |
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b12 mA/64 mA (48 mA) |
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O0 ± O7, O0 ± O7 |
Outputs |
600/106.6 (80) |
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*Worst-case 'F240 enabled; 'F241, 'F244 disabled
Truth Tables
'F240
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OE1 |
D1n |
O1n |
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OE2 |
D2n |
O2n |
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H |
X |
Z |
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H |
X |
Z |
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L |
H |
L |
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L |
H |
L |
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L |
L |
H |
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L |
L |
H |
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'F241 |
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OE1 |
D1n |
O1n |
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OE2 |
D2n |
O2n |
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H |
X |
Z |
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L |
X |
Z |
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L |
H |
H |
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H |
H |
H |
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L |
L |
L |
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H |
L |
L |
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'F244
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OE1 |
D1n |
O1n |
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OE2 |
D2n |
O2n |
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H |
X |
Z |
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H |
X |
Z |
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L |
H |
H |
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L |
H |
H |
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L |
L |
L |
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L |
L |
L |
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H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Z e High Impedance
3
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