74LCX257MTCX_NL - Fairchild Semiconductor

May 1995

Revised September 2000

74LCX257 Low Voltage Quad 2-Input Multi plexer with 5V Tolerant Inputs and Outputs

74LCX257

Low Voltage Quad 2-Input Multiplexer

with 5V Tolerant Inputs and Outputs

General Description

The LCX257 is a quad 2-input multiplexer with 3-STATE

outputs. Four bits of data from two sources can be selected

using a Common Data Select input. The four outputs

present the selected data in true (non inverted ) form. The

outputs may be switched to a high impedance state by

placing a logic HIGH on the common Output Enable (OE)

input, allo w ing th e ou tpu ts to i nt erf ace d i rec tly with bus-ori-

ented systems.

The 74LCX257 is fabricated with advanced CMOS technol-

ogy to achieve high speed operation while maintaining

CMOS low power dissipation.

Features

■5V tolerant inputs and outputs

■2.3V–3. 6V VCC specifications provided

■6.0 ns tPD max (VCC = 3.3V, In → Zn), 10 µA ICC max

■Power down high impedance inputs and outputs

■Supports live insertion/withdrawal (Note 1)

■Implements patented noise/EMI reduction circuitry

■Latch-up per for man c e exce eds 500 mA

■ESD performa nce :

Human body model > 2000V

Machine model > 200V

Note 1: To ensure the high-impedance state during power up or down, OE

should be tied to VCC throug h a pull- up resist or: the min imum value or the

resisto r is det ermin ed by the current-so urc ing capability of th e driver.

Ordering Code:

Devices also available in Tape and R eel. Speci fy by appending the s uffix let t er “X” to the ordering code.

Logic Symbols

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number Package Number Package Description

74LCX257M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

74LCX257SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74LCX257MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

S Common Data Select Input

OE 3-STATE Output Enab le Input

I0a–I0d Data Inputs from Source 0

I1a–I1d Data Inputs from Source 1

Za–Zd3-STATE Multiplexer Outputs

www.fairchildsemi.com 2

74LCX257

Functional Description

The LCX257 is a quad 2-input multiplexer with 3-STATE

outputs. It sel ects fo ur bits of dat a from two so urces u nder

control of a Common Data Select input. When the Select

input is LOW, the I0x inputs are selected and when Select

is HIGH, the I1x inputs are selected. The data on the

selected inputs appears at the outputs in true (non

inver ted) form. The device is th e logic imple mentati on of a

4-pole, 2 -po siti on swit ch whe re the po sition of the sw itch is

determ ined by the l ogic level s sup plied to the S elect i nput.

The logic equations for the outputs are shown below:

Za = OE • (11a • S + I0a • S)

Zb = OE • (11b • S + I0b • S)

Zc = OE • (11c • S + I0c • S)

Zd = OE • (11d • S + I0d • S)

When the Output Enable (OE) is HIGH, the outputs are

forced to a high impedance state. If the outputs are tied

togethe r, all but o ne de vice m ust be i n the hig h i m pe dan ce

state to avoid high currents that would exceed the maxi-

mum ratings. Des igners sh ould ensure the Ou tput Enable

signals to 3-STATE devices whose outputs are tied

together are designed so there is no overlap.

Truth Table

H = HIGH Voltage Lev el

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

Logic Diagram

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation d elays.

Output Select Data Outputs

Enable Input Inputs

OE SI

0I1Z

HXXXZ

LHXLL

LHXHH

LLLXL

LLHXH

3 www.fairchildsemi.com

74LCX257

Absolute Maximum Ratings(Note 1)

Recommended Operating Conditions (Note 4)

Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be op erated

at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recom-

mended Operating Conditions” table will define th e c onditions fo r ac t ual device operati on.

Note 3: IO Absolu te Maximu m rating must be observed.

Note 4: Unused Inputs must be held HIGH or LOW. They may not float.

DC Electrical Characteristics

Symbol Parameter Value Conditions Units

VCC Supply Voltage −0.5 to +7.0 V

VIDC Input Voltage −0.5 to +7.0 V

VODC Output Voltage −0.5 to +7.0 Output in 3-STATE V

−0.5 to VCC + 0.5 Output in HIGH or LOW State (Note 2)

IIK DC Input Diode Current −50 VI < GND mA

IOK DC Output Diode Current −50 VO < GND mA

+50 VO > VCC

IODC Output Source/Sink Current ±50 mA

ICC DC Supply Current per Supply Pin ±100 mA

IGND DC Ground Current per Ground Pin ±100 mA

TSTG Stora ge Tem per atu re −65 to +150 °C

Symbol Parameter Min Max Units

VCC Supply Voltage Operating 2.0 3.6 V

Data Retention 1.5 3.6

VIInput Voltage 05.5V

VOOutput Voltag e HIGH or LOW State 0 VCC V

3-STATE 0 5.5

IOH/IOL Output Curr en t VCC = 3.0V − 3.6V ±24

VCC = 2.7V − 3.0V ±12 mA

VCC = 2.3V − 2.7V ±8

TAFree-Air Operating Temperature −40 85 °C

∆t/∆V Input Edge Rate, VIN = 0.8 V–2.0V, VCC = 3.0V 0 10 ns/V

Symbol Parameter Conditions VCC TA = −40°C to +85°CUnits

(V) Min Max

VIH HIGH Level Input Voltage 2.3 − 2.7 1.7 V

2.7 − 3.6 2.0

VIL LOW Level Input Voltage 2.3 − 2.7 0.7 V

2.7 − 3.6 0.8

VOH HIGH Level Output Voltage IOH = −100 µA2.3 − 3.6 VCC − 0.2

IOH = −8 mA 2.3 1.8

IOH = −12 mA 2.7 2.2

IOH = −18 mA 3.0 2.4

IOH = −24 mA 3.0 2.2

VOL LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2

IOL = 8 mA 2.3 0.6

IOL = 12 mA 2.7 0.4

IOL = 16 mA 3.0 0.4

IOL = 24 mA 3.0 0.55

IIInput Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA

IOZ 3-STATE Output Leakage 0 ≤ VO ≤ 5.5V 2.3 − 3.6 ±5.0 µA

VI = VIH or VIL

IOFF Power-Off Leakage Current VI or VO = 5.5V 0 10 µA

www.fairchildsemi.com 4

74LCX257

DC Electrical Characteristics (Continued)

Note 5: Outputs dis abled or 3-STATE o nly.

AC Electrical Characteristics

Note 6: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The

specif ic ation ap plies to an y o ut puts switc hing in the s am e directi on, eit her HIGH-to-L OW (t OSHL) or LOW-to-H I GH (tOSLH).

Dynamic Switching Characteristics

Capacitance

Symbol Parameter Conditions VCC TA = −40°C to +85°CUnits

(V) Min Max

ICC Quiescent Supply Current VI = VCC or GND 2.3 − 3.6 10 µA

3.6V ≤ VI, VO ≤ 5.5V (Note 5) 2.3 − 3.6 ±10

∆ICC Increase in ICC per Input VIH = VCC −0.6V 2.3 − 3.6 500 µA

Symbol Parameter

TA = −40°C to +85°C, RL = 500 Ω

Units

VCC = 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V

CL= 50 pF CL = 50 pF CL= 30 pF

Min Max Min Max Min Max

tPHL Propagation Delay 1.5 7.0 1.5 8.5 1 .5 9.1 ns

tPLH S→Zn1.57.01.58.51.59.1

tPHL Propagation Delay 1.5 6.0 1.5 6.5 1 .5 7.2 ns

tPLH In→Zn1.56.01.56.51.57.2

tPZL Output Enable Time 1.5 7.0 1.5 8.5 1.5 9.1 ns

tPZH OE →Zn1.57.01.58.51.59.1

tPLZ Output Disable Time 1.5 5.5 1.5 6.0 1.5 6.6 ns

tPHZ OE →Zn1.55.51.56.01.56.6

tOSHL Output to Output Skew (Note 6) 1.0 ns

tOSLH 1.0

Symbol Parameter Conditions VCC TA = 25°CUnits

(V) Typical

VOLP Quiet Output Dynamic Peak VOL CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.8 V

CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.6

VOLV Quiet Output Dynamic Valley VOL CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 −0.8 V

CL = 30 pF, VIH = 2.5V, VIL = 0V 2.5 −0.6

Symbol Parameter Conditions Typical Units

CIN Input Capacitance VCC = Open, VI = 0V or VCC 7pF

COUT Output Capacitance VCC = 3.3V, VI = 0V or VCC 8pF

CPD Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 25 pF

5 www.fairchildsemi.com

74LCX257

AC LOADING and WAVEFORMS Generic for LCX Family

FIGURE 1. AC Test Circuit (CL includes prob e and jig capacitance)

Waveform for Inverting and Non-Inverting Functions

Propagation Delay. Pulse Width and trec Waveforms

3-STATE Output Low Enable and

Disable Times for Logic

3-STATE Output High Enable and

Disable Times for Logic

Setup Time, Hold Time and Recovery Time for Logic

trise and tfall

FIGURE 2. Waveforms

(Input Characteristics; f =1MHz, tR = tF = 3ns)

Test Switch

tPLH, tPHL Open

tPZL, tPLZ 6V at VCC = 3.3 ± 0.3V

VCC x 2 at VCC = 2.5 ± 0.2V

tPZH,tPHZ GND

Symbol VCC

3.3V ± 0.3V 2.7V 2.5V ± 0.2V

Vmi 1.5V 1.5V VCC/2

Vmo 1.5V 1.5V VCC/2

VxVOL + 0.3V VOL + 0.3V VOL + 0.15V

VyVOH − 0.3V VOH − 0.3V VOH − 0.15V

www.fairchildsemi.com 6

74LCX257

Schematic D ia gr a m Generic for LCX Family

7 www.fairchildsemi.com

74LCX257

Physical Dimensions inches (millimeters) unless otherwise noted

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

Package Number M16A

www.fairchildsemi.com 8

74LCX257

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Sma ll Outline Packag e (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

9 www.fairchildsemi.com

74LCX257 Low Voltage Quad 2-Input Multi plexer with 5V Tolerant Inputs and Outputs

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lea d Th in S hri n k Small Ou tlin e Pack age (TSSOP ), JED EC MO-1 53, 4.4mm Wide

Package Number MTC16

Fairchild does not assume an y responsibility fo r use of any circuitry described, no circuit pat ent licenses ar e implied and

Fairchild reserves the right at any time without notice to change said circuitry and specifications.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD

SEMICONDUCTOR CORPORATION. As used herein:

1. Life suppor t de vices o r syst ems are dev ic es or syste ms

which, (a) are intended for surgical implant into the

body, or (b) support or sustain life, and (c) whose failure

to perform when properly used in accordance with

instruct ions fo r use pr ovi de d in the l abe ling, can be rea-

sonably expected to result in a significant injury to the

user.

2. A crit ical componen t in any com ponen t of a life s uppor t

device or system whose failure to perform can be rea-

sonabl y e xpec ted to cause th e fa i lure of the l ife s upport

device or system, or to affect its safety or effectiveness.