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DM54S251J-DM74S251N
7 V, TRI-STATE 1 of 8 line data selector/multiplexer
iii? Natiqnal ,
1 Semiconductor
DM54S251/DM74S251 TRI-STATE® 1 of 8 Line
Data Selector/Multiplexer
General Description
These data seiectors/multiplexers contain full on-chip bina-
ry decoding to select one-of-eight data sources, and feature
a strobe-controlied TRI-STATE output. The strobe must be
at a low logic level to enable these devices. The TRI-STATE
outputs permit direct connection to a common bus, When
the strobe input is high, both outputs are in a high-imped-
ance state in which both the upper and lower transistors of
each totem pole output are off, and the output neither drives
nor loads the bus significantly. When the strobe is low. the
outputs are activated and operate as standard TTL totem-
pole outputs.
To minimize the possibility that two outputs will attempt to
take a common bus to opposite loglc levels, the output con-
trol circuitry is designed so that the average output disable
time is shorter than the average output enable time.
Features
II TRI-STATE version of $151
" Interface directly with system bus
tt Perform pareIIeI-to-serial conversion
u Permit multiplexing from N-lines to one line
a Complementary outputs provide true and Inverted data
a Max no. of common outputs
548 39
748 129
" Typical propagation delay time (D to Y) 8 he
a Typical power dissipation 275 mW
Connection Diagram
DATA INPUTS DATA SELECT
VCC 04 os D6 Dr" A e 6
I16 15 " " " tl " 9
1 2 3 4 s e 7 [a
D3 D2 m 001 T w STMBE GND
DATA iimsrs OUTPUTS
TL/F/6480-1
Order Number DM545251J or DM745251N
See NS Package Number MBA or N16E
Function Table
Inputs Outputs
Select "I" Y w
x x x H 2 2
L L L L D0 BT
L L H L D1 67
L H L L D2 65
L H H L D3 55
H L L L D4 DR
H L H L D5 EE
H H L L D6 BE
H H H L D7 57
H " High Logic Level. L -- Low Logic Level
X = Don't Cara, 2 -- High Impedance (Off)
DO, 01 , . . D7 = The Level of the respective D input
Absolute Maximum Ratings (Note)
If Mllltary/Aerospace trpeeltied devlcas are required,
please contact the National Semlettnduetor Sales
offlttefDitttrlbutora for availability and specificatlons.
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 thtfimtd in the "Electrical Characteristics"
table are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define
the conditions for actual device operation.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
DM54S -55''C to +125"C
DM74S 0°C to + 70°C
Storage Temperature Range
-65t to + 150°C
Recommended Operating Conditions
Symbol Parameter DM545251 DM745251 Unlts
Mln Nom Max Mln Nom Max
Vcc Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
VIH High Level Input Voltage 2 2 V
" Low Level Input Voltage 0.8 0.8 V
tor, High Level Output Current -2 -6.5 mA
'OL Low Level Output Current 20 20 mA
TA Free Air Operating Temperature - 55 125 0 70 'C
Electrical Characteristics over recommended operating free air temperature (unless otherwise noted)
Symbol Parameter Conditions Min Typ Max Units
(Note 1)
VI InputClamp Voltage Vcc = Min, I. = --1ty mA -1.2 V
VoH High LevelOutput Vcc = Min, 'OH = Max DM54 2.4 3.4
Voltage VIL --- Max,le = Min DM74 2.4 3.2
VOL Low Level OutputVoltage Vcc = Min, IOL = Max 0 5 V
VIH = Min,V|L = Max .
l, InputCurrent @ Max Vcc = Max, W == 5.5V
InpulVoltage
hH High Level Input VCC --... Max, V. = 2.7V 50 psA
lit. Low Level Input Current Vcc = Max, V. = 0.5V -2 mA
IOZH Off-State Output Current Vcc = Max, vo = 2.4
with High Level Ve = Min, 1ht. = Max 50 MA
Output Voltage Applied
IOZL Off-State Output Current Vcc = Max, vo = 0.5
with Low Level VIH = Min, " = Max -50 p.A
Output Voltage Applied
los Short Circuit Vcc = Max DM54 -40 -100
Output Current (Note 2) DM74 - 40 -100
ICC Supply Current Vcc = Max (Note 3) 55 85 mA
Note 1: All typicals are at Vcc = 5V, TA -- 25'C.
Note 2 Not more than one output shouid be shorted at a time. and the duration should not exceed one second.
Note 3: loc is measured with the outputs open and all inputs at 4.5V.
Switching Characteristics at Vcc --- 5V and TA = 25''C (See Section 1 for Test Waveforms and Output Load)
RL = 280ft
S b I P t From (Input) C " F c 50 F U its
ym o arame er To (Output) L - p L - p n
Mln Max Min Max
tpLH Propagation Delay Time A, B, or C 1 8 21 ns
Low to High Level Output (4 Levels) to Y
tPHL Propagation Delay Time A, B, or C 19 5 23 as
High to Low Level Output (4 Levels) to Y '
tpLH Propagation Delay Time A, B, or C 1 5 1 8 ns
Low to High Level Output (3 Levels) to W
tPHL Propagation Delay Time A, B, or C 13 5 17 ns
High to Low Level Output (3 Levels) to W .
tpLH Propagation Delay Time
Low to High Level Output D to Y 12 15 ns
tpHL Propagation Delay Time
High to Law Level Output D to Y 12 15 ns
tpLH Propagation Delay Time
Low to High Level Output D to W 7 10 ns
tPHL Propagation Delay Time
High to Low Level Output D to W 7 10 ns
tPZH Output Enable Time Strobe 19 5 ns
to High Level Output to Y .
tPZL Output Enable Time Strobe 21 ns
to Low Level Output to Y
tsz Output Disable Time Strobe 8 5 ns
to High Level Output (Note 1) to Y .
tPLZ Output Disable Time Strobe 1 4 ns
to Low Level Output (Note 1) to Y
thH Output Enable Time Strobe 19 5 ns
to High Level Output to W .
tPZL Output Enable Time Strobe 21 ns
to Low Level Output to W
tsz Output Disable Time Strobe 8 5 ns
to High Level Output (Note 1) to W .
tPLZ Output Disable Time Strobe 14 ns
to Low Level Output (Note 1) to W
Note 1: CL = 5 pF.
Logic Diagram
STROBE m
(ENABLE)
mpu‘rs
SELECT
(BINARY I
, Do (4)
ttt (3)
D2 (2)
D3 m ts, OUTPUT y
04 (15) OUTPUT W
DS (1"
Do (13)
07 "3)
TL/F16480-2
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:
DM74S251 N - product/dm745251n?HQS=T|-null-nulI-dscatalog-df-pf-null-wwe
DM54S251J - product/dm545251j?HQS=T|-nulI-nulI-dscatalog-df—pf—nuII-wwe
