DM74LS257BN - National Semiconductor

TL/F/6417

54LS257A/DM54LS257B/DM74LS257B, 54LS258A/DM54LS258B/DM74LS258B

TRI-STATE Quad 2-Data Selectors/Multiplexers

June 1989

54LS257A/DM54LS257B/DM74LS257B,

54LS258A/DM54LS258B/DM74LS258B

TRI-STATEÉQuad 2-Data Selectors/Multiplexers

General Description

These Schottky-clamped high-performance 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

opposite logic levels, the output enable circuitry is designed

such that the output disable times are shorter than the out-

put enable times.

This TRI-STATE output feature means that n-bit (paralleled)

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.

Features

YTRI-STATE versions LS157 and LS158 with same pin-

outs

YSchottky-clamped for significant improvement in A-C

performance

YProvides bus interface from multiple sources in high-

performance systems

YAverage propagation delay from data input 12 ns

YTypical power dissipation

LS257B 50 mW

LS258B 35 mW

YAlternate military/aerospace devices (54LS257A/

54LS258A) are available. Contact a National Semicon-

ductor Sales Office/Distributor for specifications.

Connection Diagrams

Dual-In-Line Package

TL/F/6417–1

Order Number 54LS257ADMQB, 54LS257AFMQB,

54LS257ALMQB, DM54LS257BJ, DM54LS257BW,

DM74LS257BM or DM74LS257BN

See NS Package Number E20A, J16A,

M16A, N16E or W16A

Dual-In-Line Package

TL/F/6417–2

Order Number 54LS258ADMQB, 54LS258AFMQB,

54LS258ALMQB, DM54LS258BJ, DM54LS258BW,

DM74LS258BM or DM74LS258BN

See NS Package Number E20A, J16A,

M16A, N16E or W16A

Function Table

Inputs Output Y

Output Select A B LS257 LS258

Control

HXXXZZ

LLLXLH

LLHXHL

LHXLLH

LHXHHL

High Level, L eLow Level, X eDon’t Care,

ZeHigh Impedance (off)

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales

Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 7V

Operating Free Air Temperature Range

DM54LS and 54LS b55§Ctoa

125§C

DM74LS 0§Ctoa

70§C

Storage Temperature Range b65§Ctoa

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 ‘‘Electrical Characteristics’’

table are not guaranteed at the absolute maximum ratings.

The ‘‘Recommended Operating Conditions’’ table will define

the conditions for actual device operation.

Recommended Operating Conditions

Symbol Parameter DM54LS257B DM74LS257B Units

Min Nom Max Min 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 0.7 0.8 V

IOH High Level Output Current b1b2.6 mA

IOL Low Level Output Current 12 24 mA

TAFree Air Operating Temperature b55 125 0 70 §C

’LS257B Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min Typ Max Units

(Note 1)

VIInput Clamp Voltage VCC eMin, IIeb

18 mA b1.5 V

VOH High Level Output VCC eMin, IOH eMax DM54 2.4 3.4 V

Voltage VIL eMax, VIH eMin DM74 2.4 3.1

VOL Low Level Output VCC eMin, IOL eMax DM54 0.25 0.4

Voltage VIL eMax, VIH eMin DM74 0.35 0.5 V

IOL e12 mA, VCC eMin DM74 0.25 0.4

IIInput Current @Max VCC eMax, Select 0.2 mA

Input Voltage VIe7V Other 0.1

IIH High Level Input VCC eMax, Select 40 mA

Current VIe2.7V Other 20

IIL Low Level Input VCC eMax, Select b0.8 mA

Current VIe0.4V Other b0.4

IOZH Off-State Output Current VCC eMax, VOe2.7V

with High Level Output VIH eMin, VIL eMax 20 mA

Voltage Applied

IOZL Off-State Output Current VCC eMax, VOe0.4V

with Low Level Output VIH eMin, VIL eMax b20 mA

Voltage Applied

IOS Short Circuit VCC eMax DM54 b20 b100 mA

Output Current (Note 2) DM74 b20 b100

ICCH Supply Current with VCC eMax (Note 3) 5.9 10 mA

Outputs High

ICCL Supply Current with VCC eMax (Note 3) 9.2 16 mA

Outputs Low

ICCZ Supply Current with VCC eMax (Note 3) 12 19 mA

Outputs Disabled

Note 1: All typicals are at VCC e5V, TAe25§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.

’LS257B Switching Characteristics

at VCC e5V and TAe25§C (See Section 1 for Test Waveforms and Output Load)

From (Input) RLe667X

Symbol Parameter To (Output) CLe45 pF CLe150 pF Units

Min Max Min Max

tPLH Propagation Delay Time Data to 18 27 ns

Low to High Level Output Output

tPHL Propagation Delay Time Data to 18 27 ns

High to Low Level Output Output

tPLH Propagation Delay Time Select to 28 35 ns

Low to High Level Output Output

tPHL Propagation Delay Time Select to 35 42 ns

High to Low Level Output Output

tPZH Output Enable Time Output 15 27 ns

to High Level Output Control to Y

tPZL Output Enable Time Output 28 38 ns

to Low Level Output Control to Y

tPHZ Output Disable Time from Output 26 ns

High Level Output (Note 1) Control to Y

tPLZ Output Disable Time from Output 25 ns

Low Level Output (Note 1) Control to Y

Note 1: CLe5 pF.

Recommended Operating Conditions

Symbol Parameter DM54LS258B DM74LS258B Units

Min Nom Max Min 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 0.7 0.8 V

IOH High Level Output Current b1b2.6 mA

IOL Low Level Output Current 12 24 mA

TAFree Air Operating Temperature b55 125 0 70 §C

’LS258B Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min Typ Max Units

(Note 1)

VIInput Clamp Voltage VCC eMin, IIeb

18 mA b1.5 V

VOH High Level Output VCC eMin, IOH eMax DM54 2.4 3.4 V

Voltage VIL eMax, VIH eMin DM74 2.4 3.1

VOL Low Level Output VCC eMin, IOL eMax DM54 0.25 0.4

Voltage VIL eMax, VIH eMin DM74 0.35 0.5 V

IOL e12 mA, VCC eMin DM74 0.25 0.4

IIInput Current @Max VCC eMax, Select 0.2 mA

Input Voltage VIe7V Other 0.1

IIH High Level Input VCC eMax, Select 40 mA

Current VIe2.7V Other 20

’LS258B Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) (Continued)

Symbol Parameter Conditions Min Typ Max Units

(Note 1)

IIL Low Level Input VCC eMax, Select b0.8 mA

Current VIe0.4V Other b0.4

IOZH Off-State Output Current VCC eMax, VOe2.7V

with High Level Output VIH eMin, VIL eMax 20 mA

Voltage Applied

IOZL Off-State Output Current VCC eMax, VOe0.4V

with Low Level Output VIH eMin, VIL eMax b20 mA

Voltage Applied

IOS Short Circuit VCC eMax DM54 b20 b100 mA

Output Current (Note 2) DM74 b20 b100

ICCH Supply Current with VCC eMax (Note 3) 4.1 7 mA

Outputs High

ICCL Supply Current with VCC eMax (Note 3) 914mA

Outputs Low

ICCZ Supply Current with VCC eMax (Note 3) 12 19 mA

Outputs Disabled

Note 1: All typicals are at VCC e5V, TAe25§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.

’LS258B Switching Characteristics

at VCC e5V and TAe25§C (See Section 1 for Test Waveforms and Output Load)

From (Input) RLe667X

Symbol Parameter To (Output) CLe45 pF CLe150 pF Units

Min Max Min Max

tPLH Propagation Delay Time Data to 18 27 ns

Low to High Level Output Output

tPHL Propagation Delay Time Data to 18 27 ns

High to Low Level Output Output

tPLH Propagation Delay Time Select to 28 35 ns

Low to High Level Output Output

tPHL Propagation Delay Time Select to 35 42 ns

High to Low Level Output Output

tPZH Output Enable Time Output 15 27 ns

to High Level Output Control to Y

tPZL Output Enable Time Output 28 38 ns

to Low Level Output Control to Y

tPHZ Output Disable Time from Output 26 ns

High Level Output (Note 4) Control to Y

tPLZ Output Disable Time from Output 25 ns

Low Level Output (Note 4) Control to Y

Note 4: CLe5 pF.

Logic Diagrams

LS257B

TL/F/6417–3

LS258B

TL/F/6417–4

Physical Dimensions inches (millimeters)

Ceramic Leadless Chip Carrier Package (E)

Order Number 54LS257ALMQB or 54LS258ALMQB

NS Package Number E20A

16-Lead Ceramic Dual-In-Line Package (J)

Order Number 54LS257ADMQB, 54LS258ADMQB, DM54LS257BJ or DM54LS258BJ

NS Package Number J16A

Physical Dimensions inches (millimeters) (Continued)

16-Lead Small Outline Molded Package (M)

Order Number DM74LS257BM or DM74LS258BM

NS Package Number M16A

16-Lead Molded Dual-In-Line Package (N)

Order Number DM74LS257BN or DM74LS258BN

NS Package Number N16E

54LS257A/DM54LS257B/DM74LS257B, 54LS258A/DM54LS258B/DM74LS258B

TRI-STATE Quad 2-Data Selectors/Multiplexers

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flat Package (W)

Order Number 54LS257AFMQB or 54LS258AFMQB

NS Package Number W16A

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systems which, (a) are intended for surgical implant support device or system whose failure to perform can

into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life

failure to perform, when properly used in accordance support device or system, or to affect its safety or

with instructions for use provided in the labeling, can effectiveness.

be reasonably expected to result in a significant injury

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