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DM74S257N-DM74S258N
7 V, TRI-STATE quad 1 of 2 data selector/multiplexer
National _
Semiconductor
DM54S257/DM74S257, DM54S258/DM74S258
TRl-STATE® Quad 1 of 2 Data Selectors/Multiplexers
General Description
These Schottky-clamped high-pertormance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems. With all but one of the
common outputs disabled (at a high impedance state), the
low impedance of the single enabled output will drive the
bus line to a high or low logic level. To minimize the possibil-
ity that two outputs will attempt to take a common bus to
Features
I: TRl-STATE versions $157, $158. with same pin-outs
" Schottky-clamped for significant improvement in A-C
performance
a Provides bus interface from multiple sources in high-
performance systems
I! Average propagation delay from data input
S257 4.8'ns
opposite logic levels. the output enable circuitry is designed S258 4 ns
such that the output disable times are shorter than the out- n Typical power dissipation
put enable times. S257 320 mW
This TRI-STATE output feature means that n-bit (paralleled) S258 280 mW
data selectors with up to 258 sources can be implemented
for data buses. it also permits the use of standard TTL reg-
isters for data retention throughout the system.
Connection Diagrams
DuttMttNtttt Package Dual-In-Llne Package
OUTPUT mp”. Ts OUTPUT mp”. TS OUTPUT OUTPUT INPUTS OUTPUT INPUTS OUTPUT
Vcc CONTROL A4 B4 v4 A3 B3 "
[16 Iss 14 " " 11 " Is
" 2 3 a s 6 , Its
SELECT A1 31 11 A2 B2 " GND
_---.' OUTPUT OUTPUT
INPUTS INPUTS
TLIF/6482-1
Vcc CONTROL A4 B4 " A3 B3 "
I15 Its " " [12 11 " 9
1 2 3 l4 s tt lr la
, t A2 B2 " GND
SELECT A1 tt y ur
INPUTS INPUTS 3U
TLYF/6482-2
Order Number DM548257J. DM54S258d, DM54S257W, DM745257N or DM74S258N
See NS Package Number J16A, N16E or W16A
Function Table
Inputs
Output
Control Select A
Output Y
B S257 B258
H = High Level. L = Low Level, X = Don’tCare
Z = High Impedance (off)
Absolute Maximum Ratings (Note)
If MllltaryfAerosparre speclfled devlces are required,
please contact the National Semiconductor Sales
Olflce/Dlstrlbutors for avaliabllliy and ttpetrlflttatlons.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
DM54S -55'C to + 125°C
Storage Temperature Range
0°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 defined in the ''Eletrtritatt Characteristics"
table are not guaranteed at the absolute maximum ratings.
The ''RBtgommended Operating Conditions" table will define
the conditions far actual device operation.
Recommended Operating Conditions
Symbol Parameter DM543257 DMNS2sr Units
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
VIL Low Level Input Voltage 0.8 0.8 V
lor, High Level Output Current - 2 - th5 mA
lot. Low Level Output Current 20 20 mA
TA Free Air Operating Temperature - 55 125 0 70 T
'S257 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol Parameter Conditions Min Typ Max Units
(Note1)
VI InpuiClamp Voltage Vcc = Min, I. = -18mA -1d? v
VOH High LevelOutput Vcc = Min, IOH = Max DM54 2.4 3.4 V
Voltage VIL = Max, VIH = Min DM74 2.4 3.2
VOL Low Level Output Vcc = Min, lo, = Max 0 5 V
Voltage VIH = Min,V"_ = Max .
I. InputCurrent © Max Vcc = Max, V. = 5.5V 1 mA
Input Voltage
iIH High Level Input Vcc = Max Select 100 P A
Current VI = 2.7V Other 50
IIL Low Level Input Vcc = Max, Select --4 m A
Current V. = 0.5V Other -2
'OZH Off-State Output Current Vcc = Max, V0 = 2.4V
with High Level Output VIH = Min, VI. = Max 50 WA
Voltage Applied
'OZL Ott-State Output Current with Vcc = Max, V0 = 0.5V
Low Level Output VIH = Min, " = Max -50 pA
Voltage Applied
los Short Circuit Vcc = Max DM54 -40 - 100 m A
Output Current (Note 2) DM74 - 40 -100
ICCH Supply Current with Outputs High Vcc --- Max (Note 3) 44 68 mA
lch Supply Current with Outputs Low Voc = Max (Note 3) 60 93 mA
lccz Supply Current with Outputs Disabled Voc = Max (Note 3) 64 99 mA
Note t: All Iypicals are at Voc = 5V, TA = 25'0.
Note 2'. Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: kx: is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions.
BSZSOLSZS
'S257 Switching Characteristics
at Vcc = 5V and TA = 25''C (See Section 1 for Test Waveforms and Output Load)
RL = 2800
From (Input)
Symbol Parameter To (Output) th. = 15 pF CL = 50 pF Unlts
Min Max Min Max
tpLH Propagation Delay Time Data to 7 5 1 1 ns
Low to High Level Output Output .
tPHL Propagation Delay Time Data to 6 5 1 0 ns
High to Low Level Output Output .
tpLH Propagation Delay Time Select to 1 5 1 6 ns
Low to High Level Output Output
tPHL Propagation Delay Time Select to 15 1 6 ns
High to Low Level Output Output
tPZH Output Enable Time Output
to High Level Output Control to Y 19.5 23 ns
tPZL Output Enable Time Output 21 24 ns
to Low Level Output Control to Y
1sz Output Disable Time Output 8 5 ns
to High Level Output (Note 1) Control to Y .
tPLZ Output Disable Time Output 14 ns
to Low Level Output (Note 1) Control to Y
Note It CL = 5 pF.
Recommended Operating Conditions
Symbol Parameter DM545258 DM743258 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
VIL Low Level Input Voltage 0.8 0.8 V
IOH High Level Output Current - 2 -6.5 mA
kn. Low Level Output Current 20 20 mA
TA Free Air Operating Temperature - 55 125 0 70 I
'S258 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)
Symbol Parameter Conditions Mln Typ Max Unlts
(Note 1)
V. Input Clamp Voltage VCC = Min, II = - 18 mA - 1.2 V
V0... High Level Output Vcc = Min, I0” = Max DM54 2.4 3.4 V
Voltage " = Max, VIH = Min DM74 2.4 3.2
VOL Low Level Output Vcc = Min, IOL = Max 0 5 V
Voltage " = Min, VIL = Max .
II InputCurrent© Max VCC == Max, V1 = 5.5V
Input Voltage
'IH High Level Input Vcc = Max, Select 100 PA
Current V. = 2.7V Other 50
IIL Low Level Input Vcc --- Max, Select -4
Current V = 0 5V mA
l . Other - 2
'S258 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted) (Continued)
Symbol Parameter Conditions Min Typ Max Unlts
(Note 1)
IOZH Ott-State OutputCurrent Vcc = Max, Vo = 2.4V
with High Level Output VIH = Min, " = Max 50 WA
Voltage Applied
IOZL Ofl-State Output Current with Vcc = Max, vo = 0.5V
Low Level Output VIH = Min, VIL = Max -50 p.A
Voltage Applied
los Short Circuit Vcc = Max DM54 -- 40 - 100
Out ut Current (Note 2) mA
p DM74 -40 -100
ICCH Supply Current with Vcc = Max
Outputs High (Note 3) 36 56 mA
ICCL Supply Current with Vcc = Max
Outputs Low (Note 3) 52 81 mA
lccz Supply Current with Vcc = Max
Outputs Disabled (Note 3) 56 87 mA
Nola 1: All typicals are at Vcc = 5V, TA = 25''C.
Note 2: Not more than one output should be shorted at a time. and the duration should not exceed one second.
Note 3: ICC is measured with all outputs open and all possible inputs grounded, while achieving the stated output conditions.
'S258 Switching Characteristics
at Vcc = 5V and TA = 25''C (See Section 1 for Test Waveforms and Output Load)
From (Input) RL = 280n
Symbol Parameter To (Output) A. = 15 pF Ct. = 50 pF Unlls
Mln Max Mln Max
tpLH Propagation Delay Time Data to 6 9 ns
Low to High Level Output Output
tpHL Propagation Delay Time Data to 6 9 ns
High to Low Level Output Output
tpLH Propagation Delay Time Select to 1 2 15 ns
Low to High Level Output Output
tpHL Propagation Delay Time Select to 12 1 5 ns
High to Low Level Output Output
tPZH Output Enable Time Output
to High Level Output Control to Y 9 5 23 ns
tPZL Output Enable Time Output 21 24 ns
to Low Level Output Control to Y
tsz Output Disable Time Output 8 5 ns
to High Level Output (Note 1) Control to Y '
tPLZ Output Disable Time Output 14 ns
to Low Level Output (Note 1) Control to Y
Note 1: CL " 5 pF.
Logic Diagrams
OUTPUTHS
CONTROL“,
BI (a) (A) v1
B2 (6) tr) "
A3 ttll
B3 ttol lg) "
A4 (1‘)
B4 (13) 1821 "
SELECT‘ '
TLIF/M32-3
OUTPUT (15)
CONTROL
Mm [ ,
D I (4)
" J I tr)
ASH” _ i
T D L- (9)
<10) Rr-e "
(13) -ilyp "
SELECT
TL/F/6482-4
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:
DM74S258N - product/dm74sZ58n?HQS=T|-null-nulI-dscatalog-df-pf-null-wwe
DM74S257N - product/dm743257n?HQS=T|-nu|I-nulI-dscatalog-df-pf-nuIl-wwe
DM54S258J - product/dm548258j?HQS=T|—nu|I-nulI-dscatalog-df—pf—nuII-wwe
DM54S257W - product/dm543257w?HQS=T|-nu|I-nulI-dscatalog-df—pf—nuIl-wwe
DM54S257J - product/dm545257j?HQS=T|-nu|I-nulI-dscatalog-df-pf-nuII-wwe
