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These buffers/line drivers are designed to improve both the
performance and ..
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54LS240-DM74LS240N
Octal TRI-STATE Buffers/Line Drivers/Line Receivers
L9240 ° L3241
gif Natiqnal
Semiconductor
54LS240/DM54LS240/DM74LS240,
54LS241/DM54LS240DM74LS241
Octal TRI-STATE® Buffers/Line Drivers/Line Receivers
General Description
These buffers/line drivers are designed to improve both the
performance and PC board density of TRI-STATE buffers/
drivers employed as memory-address drivers, clock drivers,
and bus-oriented trt1nsmitttarsfratrt6ers, Featuring 400 mV
of hysteresis at each low current PNP data line input, they
provide improved noise rejection and high fanout outputs
and can be used to drive terminated lines down to 1330.
Features
I: TRI-STATE outputs drive bus lines directly
I: PNP inputs reduce DC loading on bus lines
I: Hysteresis at data inputs improves noise margins
n Typical lot. (sink current)
54LS 12 mA
74LS 24 mA
a Typical Iori (source current)
54LS --12 mA
74LS - 15 mA
a Typical propagation delay times
Inverting 10.5 ns
Noninverting 12 ns
:1 Typical enable/disable time 18 ns
a Typical power dissipation (enabled)
Inverting 130 mW
Noninverting 135 mW
n Alternate Military/Aerospace devices (54LS240/
54LS241) are available. Contact a National Semicon-
ductor Sales Office/Distributor for specifications.
Connection Diagrams
Dual-In-Llne Package
Yee m trt an '" 2A: 11: 2A2 1V4 2A1
Izajw " " " " u " " "
i7 E? E7 RL
///////
£3 J? 2E 21
l‘aaaeovaolw
15 IAt a" 1A: an IM 21: m an
TL/F/8411-1
Order Number 64LS240DMt2B, 64LS240FMt2B,
64LS240LMQB, DMMLS24thl,
DM74L524OWM or DM74L8240N
599 NS Package Number E20A, J20A,
M203, N20A or W20A
Function Tables
Inputs Output
DuaI-In-Llno Package
Vcc m 111 2A6 "2 2A3 IO 2A2 '" tht
Fo I19 " " " " " " " "
///////
lt2a4stsrtstrlto
1E $At '" '" trt 1A3 '" IM 2Y1GND
TL/F/6411-2
Order Number 64LS2MDW2B, ti4LS248FMt2B,
54LS241LMOB, DM54LS241d,
DM74L8241WM or DM74L8241N
800 NS Package Number E20A, d20A,
MMB, N20A or W20A
In puts Outputs
G G 1A 2A " "
X L L X L
X L H X H
X H X X 2
H X X L L
H X X H H
L X X X Z
L -- Low Logic Level
H - High Logic Level
X a Either Low or ngh Logic Level
2 = High Impedance
Absolute Maximum Ratings (Note)
If Mllllary/Aerospace speclfled devices are required,
please contact the National Semiconductor Sales
offitNVDlatributora for availability and specificatlons.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM54LS, 54LS
DM74LS
Storage Temperature Range
- 55"C to + 125''C
ty'C to + 70%
--65'C to + 150''C
Note: The "Absolute Maximum Ratings" are those values
beyond which the safety of the device cannot be guaran-
teed. The device should not be operated at these limits. The
parametric values ttttfined in the "Electrical Characteristics"
table are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will defing
the conditions for actual device operation.
Recommended Operating Conditions
Symbol Parameter DMMLS240, 241 DM74L8240, 241 U nits
Mln Nom Max Mln Nom Max
Voc Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
Ihr, High Level Input Voltage 2 2 V
" Low Level Input Voltage 0.7 0.8 V
IOH High Level Output Current -12 - 1 5 mA
IOL Low Level Output Current 12 24 mA
TA Free Air Operating Temperature --55 125 0 70 (
Electrical Characteristics over recommended operating free ajrtemperature range (unless otherwise noted)
Symbol Parameter Conditions Mln (Note 1) Max Unite
VI Inputtyamp Voltage Vcc = Min, l. = -18 mA --1.5 V
HYS Hysteresis (VT+ - VT-) Vcc = Min
Data Inputs Only 0.2 th4 V
VOH High Level Output Voltage VCC = Min, VIH = Min DM74
VIL = Max, IOH = --1mA
Vcc = Min, " = Min DM54/DM74
" = Max, IOH P.r= --3 mA 2.4 3.4 V
Vcc = Min,Vm = Min DM54/DM74 2
" = 0.5V, IOH = Max
VOL Low Level Output Voltage Vcc = Min IOL = 12 mA DM74 0.4
" Tee Max =
VIH = Min IOL Max DM54 0.4 V
DM74 0.5
'OZH Off-State Output Current, VCC = Max Vo = 2.7V 20 A
High Level Voltage Applied " = Max P
IOZL omsme OutputCurtent. VIH == Min Vo = 0.4V -20 A
Low Level Voltage Applied "
II Input Current at Maximum Vcc = Max,Vl = 7V(DM74) 0 1 m A
lnputVoltage V. = 10V (DM54) .
IIH High Level InpulCurrent Vcc --- Max; V. = 2.7V 20 p.A
lit. Low Level Input Current Vcc = Max; V. = 0.4V -0.2 mA
los Short Circuit Output Current Vcc = Max (Note 2) -40 -225 mA
ICC Supply Current Vcc = Max. Outputs High LS240, LSZ41 13 23
Outputs Open Outputs Low LS240 26 44
LS241 27 46 mA
Outputs Disabled LS240 29 50
LS241 32 54
Not. 1: All lypicals are at Voc -- SV, TA = 25'C.
Note 2: Not more than one output should be shorted at a time. and the duration should not exceed one second.
”’231 0 OVZS'I
L5240 0 LS241
Switching Characteristics at Vcc = 5V and TA = 25°C (See Section 1 for Test Waveforms and Output Load)
Symbol Parameter Conditions DM54LS DMNLS Units
Max Max
tpLH Propaga1ion Delay Time CL = 45 pF LS240 18 14 ns
Low to High Level Output RL = 667ft L8241 18 18
tpHL Propagation Delay Time CL --- 45 pF LS240 18 18 ns
High to Low Level Output Rt. = 667tt LSMI 18 18
tPZL Output Enable Time to CL = 45 pF LS240 30 30 ns
Low Level RL = 6670 LS241 30 30
thH Oylput Enable Time to CL = 45 pF LS240 23 23 ns
High Level RL = 667ft LS241 23 23
tPLZ Output Disable Time CL = 5 pF LS240 25 25 ns
from Low Level RL = 667n LS241 25 25
tsz Output_Disable Time Ct. = 5 pF LS240 18 18 ns
from High Level RL TW. 667ft LS241 18 18
tpLH Propagatjon Delay Time CL = 150 pF LS240 18 ns
Low to High Level Output RL = 6670 LS24t 21
tPHL Propagation Delay Time th. == 150 pF LS240 22 ns
High to Low Level Output RL = 667n LS241 22
thL Output Enable Time to CL = 150 pF LS240 33 ns
Low Level RL = 6670 LS241 33
tPZH Oytput Enable Time to CL = 150 pF LS240 26 ns
High Level Rt. == 6670. LS241 26
Non: 54LS Output load is CL 8 50 pF for tPLH, tPHL, tPZL and 1pm.
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
corp/docs/irwestor_relations/Pr_09_23_201 1_national_semiconductor.html
This file is the datasheet for the following electronic components:
54LS240LMQB - product/54IsZ40Imqb?HQS=TI-nu|I-nu||-dscatalog-df-pf-null-wwe
DM74LS240N - product/dm74|3240n?HQS=T|-nu|I-nu|I-dscataIog-df-pf-null-wwe
54LS240FMQB - product/54IsZ40fmqb?HQS=T|-null-null-dscatalog-df—pf—nuII-wwe
54LS240DMQB - product/54I3240dmqb?HQS=T|-nu|I-nulI-dscatalog-df—pf—nuII-wwe
54LS240 - product/54IsZ40?HQS=T|-nu|I-nu|I-dscataIog-df-pf-null-wwe
DM54LS240WM - product/dm54|3240wm?HQS=T|-nulI-nu|I-dscataIog-df-pf-null-wwe
54LS241LMQB - product/54ISZ41|mqb?HQS=TI-nu|I—nu|I-dscatalog-df—pf—null-wwe
54LS241FMQB - product/54ISZ41fmqb?HQS=T|-nul|—null-dscatalog-df—pf—nuII-wwe
DM74LS241 N - product/dm74lsZ41n?HQS=T|-nu|I-nu|l-dscataIog-df-pf-null-wwe
54LS241DMQB - product/54ISZ41qub?HQS=T|-nu|I-nulI-dscatalog-df—pf-nuII-wwe
DM74LS241 N - product/dm74lsZ41n?HQS=T|-nu|I-nu|I-dscataIog-df-pf-null-wwe
54LS241 - product/54IsZ41?HQS=T|—nu||—nu|I-dscatalog-df—pf—nuII-wwe
DM74LS241 N - product/dm74lsZ41n?HQS=T|-nu|I-nu|l-dscataIog-df-pf-null-wwe
54LS240LMQB - product/54|3240|mqb?HQS=TI-nu|I-nu|I-dscatalog-df—pf—null-wwe
54LS240FMQB - product/54IsZ40fmqb?HQS=T|-null-null-dscatalog—df—pf—nuII-wwe
DM74LS240N - product/dm74lsZ40n?HQS=TI—nu|I-null-dscataIog-df-pf-nuII-wwe
54LS240DMQB - product/54lsZ40qub?HQS=T|-nu|I-nulI-dscatalog-df-pf—nuII-wwe
DM74LS240N - product/dm74lsZ40n?HQS=T|—nu|I-nu|I-dscataIog-df-pf-null-wwe
54LS240 - product/54IsZ40?HQS=T|—nu||-nu|I-dscataIog-df-pf—nuII-wwe
DM54LS241WM - product/dm54lsZ41wm?HQS=T|—nulI—nu|I—dscataIog-df-pf-nulI-wwe
54LS241LMQB - product/54IsZ41|mqb?HQS=T|-nu|I-nul|-dscatalog-df—pf—null-wwe
54LS241FMQB - product/54IsZ41fmqb?HQS=T|-null-null-dscatalog—df—pf—nuII-wwe
DM54LS241WM - product/dm54lsz41wm?HQS=TI-nulI—nu|I—dscataIog-df—pf—nulI-wwe
DM54LS240WM - product/dm54|sZ40wm?HQS=T|—nulI—nu|I—dscataIog-df-pf-null-wwe
54LS241DMQB - product/54ISZ41qub?HQS=T|-nu|I-nulI-dscatalog-df—pf—nuII-wwe
54LS241 - product/54ISZ41?HQS=TI-nu|I-nu|I-dscataIog-df-pf-null-wwe
