Datasheet MC74LCX646SD, MC74LCX646DT, MC74LCX646DW Datasheet (Motorola)



SEMICONDUCTOR TECHNICAL DATA

")" &  &
$!%($%&$
$!%($

& " $!& !#'&% ! '&#'&%
&& "!!($&!

The MC74LCX646 is a high performance, non–inverting octal
transceiver/registered transceiver operating from a 2.7 to 3.6V supply.
High impedance TTL compatible inputs significantly reduce current
loading to input drivers while TTL compatible outputs offer improved
switching noise performance. A VI specification of 5.5V allows
MC74LCX646 inputs to be safely driven from 5V devices. The
MC74LCX646 is suitable for memory address driving and all TTL level
bus oriented transceiver applications.

Data on the A or B bus will be clocked into the registers as the
appropriate clock pin goes from a LOW–to–HIGH logic level. Output
Enable (OE
In the transceiver mode, data present at the high impedance port may be
stored in either the A or the B register or in both. The select controls (SBA,
SAB) can multiplex stored and real–time (transparent mode) data. The
direction control (DIR) determines which bus will receive data when the
enable OE
be stored in the B register or B data may be stored in the A register. Only
one of the two buses, A or B, may be driven at one time.

• Designed for 2.7 to 3.6V V

• 5V Tolerant — Interface Capability With 5V TTL Logic

• Supports Live Insertion and Withdrawal

• I

OFF

• LVTTL Compatible

• LVCMOS Compatible

• 24mA Balanced Output Sink and Source Capability

• Near Zero Static Supply Current in All Three Logic States (10µA)

Substantially Reduces System Power Requirements

• Latchup Performance Exceeds 500mA

• ESD Performance: Human Body Model >2000V; Machine Model >200V

) and DIR pins are provided to control the transceiver outputs.

is active LOW. In the isolation mode (OE HIGH), A data may

Operation

CC

Specification Guarantees High Impedance When VCC = 0V

V

CBA SBA OE

CC

2324 22 21 20 19 18

Pinout: 24–Lead Package (Top View)

B0 B1 B2 B3 B4 B5

17

16

15

B6 B7
14

13



LOW–VOLTAGE CMOS

OCTAL TRANSCEIVER/

REGISTERED TRANSCEIVER

DW SUFFIX

24

1

24

24

PIN NAMES

Pins

A0–A7
B0–B7
CAB, CBA
SAB, SBA
DIR, OE

1

1

Function

Side A Inputs/Outputs
Side B Inputs/Outputs
Clock Pulse Inputs
Select Control Inputs
Output Enable Inputs

PLASTIC SOIC
CASE 751E–04

SD SUFFIX

PLASTIC SSOP

CASE 940D–03

DT SUFFIX

PLASTIC TSSOP

CASE 948H–01

21 34567

CAB SAB DIR A0 A1 A2 A3 A4 A5 A6

11/96

 Motorola, Inc. 1996

9

8

1

10

11

12

A7 GND

REV 2

MC74LCX646

O

1

CBA

3

DIR

21

OE

22

SBA

2

SAB

23

CAB

A0

1 of 8 Channels

LOGIC DIAGRAM

C

Q

D

C

Q

D

B0

To 7 Other Channels

FUNCTION TABLE

Inputs

OE DIR CAB CBA SAB SBA An Bn

H X Input Input

↑ ↑ X X X X Isolation, Hold Storage
↑ ↑ X X l

L H Input Output

↑ X* L X L

H X X QA Stored A Data to B Bus

↑ X* L X l

H X L

L L Output Input

X* ↑ X L L

X H QB X Stored B Data to A Bus

X* ↑ X L L

X H QB

H = High Voltage Level; h = High Voltage Level One Setup Time Prior to the Low–to–High Clock Transition; L = Low Voltage Level; l = Low Voltage Level One Setup
Time Prior to the Low–to–High Clock T ransition; X = Don’t Care; ↑ = Low–to–High Clock Transition; ↑
QB = B input storage register; * = The clocks are not internally gated with either the Output Enables or the Source Inputs. Therefore, data at the A or B ports may be
clocked into the storage registers, at any time. For ICC reasons, Do Not Float Inputs.

Data Ports

h
X
X

H

h

H

H

H

QB

perating Mode

X
X

l

h

L

H

L

H

QA
QA

L

H

l

h
L

H

= NOT Low–to–High Clock Transition; QA = A input storage register;

Store A and/or B Data

Real Time A Data to B Bus

Real Time A Data to B Bus; Store A Data

Clock A Data to B Bus; Store A Data

Real Time B Data to A Bus

Real Time B Data to A Bus; Store B Data

Clock B Data to A Bus; Store B Data

MOTOROLA LCX DATA

2

BR1339 — REV 3

BUS APPLICATIONS

MC74LCX646

Real Time Transfer – Bus B to

Bus A

BUS A

OELDIR

CABXCBAXSABXSBA

L

Store Data from Bus A, Bus B or

Busses A and B

BUS B

L

Real Time Transfer – Bus A to

Bus B

BUS A

OELDIR

CABXCBAXSABLSBA

H

Transfer Storage Data to Bus A

or Bus B

BUS B

X

OE

X
X
H

BUS A

DIR

OE

L
L

BUS A

DIR

BUS B

CAB

CBA

SAB

SBA

L

X

H

H or L

H or L

X

X

H

H

X

BUS B

CAB

CBA

X

↑

X
X

X

X

↑
↑

↑

SAB

X
X
X

SBA

X
X
X

LCX DATA
BR1339 — REV 3

3 MOTOROLA

MC74LCX646

ABSOLUTE MAXIMUM RATINGS*

Symbol Parameter Value Condition Unit

V

CC

V

I

V

O

I

IK

I

OK

I

O

I

CC

I

GND

T

STG

* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions

beyond those indicated may adversely affect device reliability. Functional operation under absolute–maximum–rated conditions is not implied.

1. Output in HIGH or LOW State. IO absolute maximum rating must be observed.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

V

CC

V

I

V

O

I

OH

I

OL

I

OH

I

OL

T

A

∆t/∆V Input Transition Rise or Fall Rate, VIN from 0.8V to 2.0V ,

DC Supply Voltage –0.5 to +7.0 V
DC Input Voltage –0.5 ≤ VI ≤ +7.0 V
DC Output Voltage –0.5 ≤ VO ≤ +7.0 Output in 3–State V

–0.5 ≤ VO ≤ VCC + 0.5 Note 1. V
DC Input Diode Current –50 VI < GND mA
DC Output Diode Current –50 VO < GND mA

+50 VO > V
DC Output Source/Sink Current ±50 mA
DC Supply Current Per Supply Pin ±100 mA
DC Ground Current Per Ground Pin ±100 mA
Storage Temperature Range –65 to +150 °C

Supply Voltage Operating

Data Retention Only
Input Voltage 0 5.5 V
Output Voltage (HIGH or LOW State)

(3–State)
HIGH Level Output Current, VCC = 3.0V – 3.6V –24 mA
LOW Level Output Current, VCC = 3.0V – 3.6V 24 mA
HIGH Level Output Current, VCC = 2.7V – 3.0V –12 mA
LOW Level Output Current, VCC = 2.7V – 3.0V 12 mA
Operating Free–Air Temperature –40 +85 °C

VCC = 3.0V

2.0

1.5

0
0

0 10 ns/V

3.3

3.3

CC

V

3.6

3.6

CC

5.5

mA

V

V

DC ELECTRICAL CHARACTERISTICS

TA = –40°C to +85°C

Symbol Characteristic Condition Min Max Unit

V

IH

V

IL

V

OH

V

OL

2. These values of VI are used to test DC electrical characteristics only.

MOTOROLA LCX DATA

HIGH Level Input Voltage (Note 2.) 2.7V ≤ VCC ≤ 3.6V 2.0 V
LOW Level Input Voltage (Note 2.) 2.7V ≤ VCC ≤ 3.6V 0.8 V
HIGH Level Output Voltage 2.7V ≤ VCC ≤ 3.6V; IOH = –100µA VCC– 0.2 V

VCC = 2.7V; IOH = –12mA 2.2
VCC = 3.0V; IOH = –18mA 2.4
VCC = 3.0V; IOH = –24mA 2.2

LOW Level Output Voltage 2.7V ≤ VCC ≤ 3.6V; IOL = 100µA 0.2 V

VCC = 2.7V; IOL= 12mA 0.4
VCC = 3.0V; IOL = 16mA 0.4
VCC = 3.0V; IOL = 24mA 0.55

4

BR1339 — REV 3

MC74LCX646

DC ELECTRICAL CHARACTERISTICS (continued)

TA = –40°C to +85°C

Symbol Characteristic Condition Min Max Unit

I

I

I

OZ

I

OFF

I

CC

∆I

CC

AC CHARACTERISTICS (tR = tF = 2.5ns; CL = 50pF; RL = 500Ω)

Symbol Parameter W aveform Min Max Min Max Unit

f

max

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

t

s

t

h

t

w

t

OSHL

t

OSLH

3. 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 specification applies to any outputs switching in the same direction, either HIGH–to–LOW (t
guaranteed by design.

Input Leakage Current 2.7V ≤ VCC ≤ 3.6V; 0V ≤ VI ≤ 5.5V ±5.0 µA
3–State Output Current 2.7 ≤ VCC ≤ 3.6V; 0V ≤ VO ≤ 5.5V;

Power–Off Leakage Current VCC = 0V; VI or VO = 5.5V 10 µA
Quiescent Supply Current

Increase in ICC per Input 2.7 ≤ VCC ≤ 3.6V; VIH = VCC – 0.6V 500 µA

Clock Pulse Frequency 3 150 MHz

Propagation Delay
Input to Output

Propagation Delay
Clock to Output

Propagation Delay
Select to Output

Output Enable Time to
High and Low Level

Output Disable Time From
High and Low Level

Setup Time, HIGH or LOW Data to Clock 3 2.5 2.5 ns
Hold Time, HIGH or LOW Data to Clock 3 1.5 1.5 ns
Clock Pulse Width, HIGH or LOW 3 3.3 3.3 ns
Output–to–Output Skew

(Note 3.)

2.7 ≤ VCC ≤ 3.6V; VI = GND or V

2.7 ≤ VCC ≤ 3.6V; 3.6 ≤ VI or VO ≤ 5.5V ± 10 µA

VI = VIH or V

VCC = 3.0V to 3.6V VCC = 2.7V

1 1.5

1.5

3 1.5

1.5

1 1.5

1.5

2 1.5

1.5

2 1.5

1.5

IL

CC

Limits

TA = –40°C to +85°C

7.0

7.0

8.5

8.5

8.5

8.5

8.5

8.5

8.5

8.5

1.0

1.0

) or LOW–to–HIGH (t

OSHL

1.5

1.5

1.5

1.5

1.5

1.5

1.5

1.5

1.5

1.5

±5.0 µA

10 µA

8.0

8.0

9.5

9.5

9.5

9.5

9.5

9.5

9.5

9.5

); parameter

OSLH

ns

ns

ns

ns

ns

ns

DYNAMIC SWITCHING CHARACTERISTICS

TA = +25°C

Symbol Characteristic Condition Min Typ Max Unit

V

OLP

V

OLV

4. Number of outputs defined as “n”. Measured with “n–1” outputs switching from HIGH–to–LOW or LOW–to–HIGH. The remaining output is
measured in the LOW state.

LCX DATA
BR1339 — REV 3

Dynamic LOW Peak Voltage (Note 4.) VCC = 3.3V, CL = 50pF, VIH = 3.3V, VIL = 0V 0.8 V
Dynamic LOW Valley Voltage (Note 4.) VCC = 3.3V, CL = 50pF, VIH = 3.3V, VIL = 0V 0.8 V

5 MOTOROLA

MC74LCX646

CAPACITIVE CHARACTERISTICS

Symbol Parameter Condition Typical Unit

C

IN

C

I/O

C

PD

Input Capacitance VCC = 3.3V, VI = 0V or V
Input/Output Capacitance VCC = 3.3V, VI = 0V or V
Power Dissipation Capacitance 10MHz, VCC = 3.3V, VI = 0V or V

An, Bn,

SBA, SAB

Bn, An

WAVEFORM 1 – SAB to B and SBA to A, An to Bn PROPAGATION DELAYS

1.5V

t

, t

PLH

PHL

1.5V

tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns

CC
CC

CC

2.7V

0V

V

OH

V

OL

7 pF
8 pF

25 pF

OE

1.5V1.5V

DIR

t

PZH

An, Bn

t

PZL

An, Bn

WAVEFORM 2 – OE/DIR to An/Bn OUTPUT ENABLE AND DISABLE TIMES

tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns

1.5V

1.5V

t

PHZ

t

PLZ

VOH – 0.3V

VOL + 0.3V

Figure 1. AC Waveforms

2.7V

0V

≈

≈

3.0V

0V

MOTOROLA LCX DATA

6

BR1339 — REV 3

An, Bn

CAB,

CBA

Bn, An

MC74LCX646

2.7V

1.5V
0V

t

s

1.5V

t

h

t

w

t

PLH

, t

1.5V

PHL

f

max

1.5V

2.7V

0V

V

OH

V

OL

WAVEFORM 3 – CLOCK to Bn/An PROPAGATION DELAYS, CLOCK MINIMUM PULSE WIDTH,

tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns except when noted

NEGATIVE
PULSE

POSITIVE
PULSE

An/Bn to CLOCK SETUP AND HOLD TIMES

t

1.5V

1.5V

WAVEFORM 4 – INPUT PULSE DEFINITION

tR = tF = 2.5ns, 10% to 90% of 0V to 2.7V

w

t

w

1.5V

1.5V

Figure 2. AC Waveforms

V

CC

R

PULSE

GENERATOR

DUT

R

T

C

L

1

R

L

6V
OPEN
GND

LCX DATA
BR1339 — REV 3

TEST SWITCH

t

, t

PLH

PHL

t

, t

PZL

PLZ

Open Collector/Drain t
t

, t

PZH

PHZ

CL = 50pF or equivalent (Includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = Z

of pulse generator (typically 50Ω)

OUT

PLH

and t

PHL

Open

GND

Figure 3. T est Circuit

7 MOTOROLA

6V
6V

MC74LCX646

24 13

112

D 24 PL

–T

–

SEATING
PLANE

–A

–

0.010 (0.25) A B

M

S S

T

G 22 PL

OUTLINE DIMENSIONS

DW SUFFIX

PLASTIC SOIC PACKAGE

CASE 751E–04

ISSUE E

–B

P 12 PL

–

C

K

0.010 (0.25)

J

F

M

M M

B

R X 45°

NOTES:

1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15
(0.006) PER SIDE.

5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D
DIMENSION AT MAXIMUM MATERIAL
CONDITION.

MILLIMETERS INCHES

MIN MINMAX MAX

DIM

A
B
C
D
F
G

K
M
P
R

J

15.54

7.60

2.65

0.49

0.90

0.32

0.29
8

10.55

0.75

0.601

0.292

0.093

0.014

0.016

0.009

0.005
0

°

°

0.395

0.010

15.25

7.40

2.35

0.35

0.41

1.27 BSC 0.050 BSC

0.23

0.13
0

°

10.05

0.25

0.612

0.299

0.104

0.019

0.035

0.013

0.011
8

°

0.415

0.029

0.076 (0.003)

SEATING

–T–

PLANE

L/2

L

PIN 1
IDENT

0.20 (0.008) T

C

D

K24X REF

0.12 (0.005) V

24 13

A

–V–

M

S

U

G

H

SD SUFFIX

PLASTIC SSOP PACKAGE

CASE 940D–03

ISSUE B

M

S

U

T

S

J

B

121

–U–

N

N

DETAIL E

K

K1

SECTION N–N

0.25 (0.010)

M

F

DETAIL E

J1

–W–

NOTES:

4 DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.
5 CONTROLLING DIMENSION: MILLIMETER.
6 DIMENSION A DOES NOT INCLUDE MOLD FLASH,

PROTRUSIONS OR GATE BURRS. MOLD FLASH

OR GATE BURRS SHALL NOT EXCEED 0.15

(0.006) PER SIDE.
7 DIMENSION B DOES NOT INCLUDE INTERLEAD

FLASH OR PROTRUSION. INTERLEAD FLASH OR

PROTRUSION SHALL NOT EXCEED 0.15 (0.006)

PER SIDE.
8 DIMENSION K DOES NOT INCLUDE DAMBAR

PROTRUSION/INTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN

EXCESS OF K DIMENSION AT MAXIMUM

MATERIAL CONDITION. DAMBAR INTRUSION

SHALL NOT REDUCE DIMENSION K BY MORE

THAN 0.07 (0.002) AT LEAST MATERIAL

CONDITION.
9 TERMINAL NUMBERS ARE SHOWN FOR

REFERENCE ONLY.

10 DIMENSION A AND B ARE TO BE DETERMINED

AT DATUM PLANE –W–.

MILLIMETERS

DIMAMIN MAX MIN MAX

8.07 8.33 0.317 0.328

B 5.20 5.38 0.205 0.212
C 1.73 1.99 0.068 0.078
D 0.05 0.21 0.002 0.008
F 0.63 0.95 0.024 0.037
G 0.65 BSC 0.026 BSC
H 0.44 0.60 0.017 0.024
J 0.09 0.20 0.003 0.008

J1 0.09 0.16 0.003 0.006

K 0.25 0.38 0.010 0.015

K1 0.25 0.33 0.010 0.013

L 7.65 7.90 0.301 0.311
M 0 8 0 8

____

INCHES

MOTOROLA LCX DATA

8

BR1339 — REV 3

OUTLINE DIMENSIONS

MC74LCX646

S

U0.15 (0.006) T

S

U0.15 (0.006) T

0.10 (0.004)

SEATING

–T–

PLANE

PLASTIC TSSOP PACKAGE

DT SUFFIX

CASE 948H–01

ISSUE O

24X REFK

M

2X L/2

0.10 (0.004) V

24

L

PIN 1
IDENT.

1

A

–V–

C

D

G

S

U

T

S

NOTES:

1 DIMENSIONING AND TOLERANCING PER ANSI

13

B

–U–

12

H

–W–

Y14.5M, 1982.
2 CONTROLLING DIMENSION: MILLIMETER.
3 DIMENSION A DOES NOT INCLUDE MOLD FLASH,

PROTRUSIONS OR GATE BURRS. MOLD FLASH

OR GATE BURRS SHALL NOT EXCEED 0.15

(0.006) PER SIDE.
4 DIMENSION B DOES NOT INCLUDE INTERLEAD

FLASH OR PROTRUSION. INTERLEAD FLASH OR

PROTRUSION SHALL NOT EXCEED

0.25 (0.010) PER SIDE.

5 DIMENSION K DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN

EXCESS OF THE K DIMENSION AT MAXIMUM

MATERIAL CONDITION.
6 TERMINAL NUMBERS ARE SHOWN FOR

REFERENCE ONLY.
7 DIMENSION A AND B ARE TO BE DETERMINED

AT DATUM PLANE –W–.

DIM MIN MAX MIN MAX

A 7.70 7.90 0.303 0.311
B 4.30 4.50 0.169 0.177
C ––– 1.20 ––– 0.047
D 0.05 0.15 0.002 0.006
F 0.50 0.75 0.020 0.030
G 0.65 BSC 0.026 BSC
H 0.27 0.37 0.011 0.015
J 0.09 0.20 0.004 0.008

J1 0.09 0.16 0.004 0.006

K 0.19 0.30 0.007 0.012

K1 0.19 0.25 0.007 0.010

L 6.40 BSC 0.252 BSC
M 0 8 0 8

____

INCHESMILLIMETERS

DETAIL E

K

N

K1

J1

SECTION N–N

J

N

F

DETAIL E

0.25 (0.010)

M

LCX DATA
BR1339 — REV 3

9 MOTOROLA

MC74LCX646

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty , representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “T ypical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.

How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; JAP AN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,

P.O. Box 5405, Denver, Colorado 80217. 1–800–441–2447 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315

Mfax: [e-mail] – TOUCHT ONE 602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
INTERNET: http://Design–NET .com 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298

MOTOROLA LCX DATA

10

◊

MC74LCX646/D

BR1339 — REV 3