Datasheet MC74ACT646DWR2, MC74ACT646DW, MC74AC646N, MC74AC646DW, MC74AC646DWR2 Datasheet (Motorola)

5-1

FACT DATA

  
!  !

The MC74AC646/74ACT646 consist of registered bus transceiver circuits,
with outputs, D-type flip-flops and control circuitry providing multiplexed transmission
of data directly from the input bus or from the internal storage registers. Data on the
A or B bus will be loaded into the respective registers on the LOW-to-HIGH transition
of the appropriate clock pin (CAB or CBA). The four fundamental data handling
functions available are illustrated in the following figures.

REAL TIME TRANSFER

A-BUS TO B-BUS

REAL TIME TRANSFER

B-BUS TO A-BUS

REG

REG REG REG

REG REG REG REG

B-BUS B-BUS

A-BUS A-BUS

B-BUS B-BUS

A-BUS A-BUS

STORAGE

FROM BUS TO REGISTER

TRANSFER

FROM REGISTER TO BUS

Figure 1 Figure 2

Figure 3 Figure 4

• Independent Registers for A and B Buses

• Multiplexed Real-Time and Stored Data Transfers

• Choice of True and Inverting Data Paths

• 3-State Outputs

• 300 mil Slim Dual In-Line Package

• Outputs Source/Sink 24 mA

• ′ACT646 Has TTL Compatible Inputs





OCTAL

TRANSCEIVER/REGISTER

WITH 3-STATE OUTPUTS

(NON-INVERTING)

N SUFFIX

CASE 724-03

PLASTIC

DW SUFFIX

CASE 751E-04

SOIC PACKAGE

LOGIC SYMBOL

A0A1A2A3A4A5A6A

7

B0B1B2B3B4B5B6B

7

CAB
SAB
DIR
CBA
SBA
G

MC74AC646 MC74ACT646

5-2

FACT DATA

FUNCTION TABLE

Inputs Data I/O*

G DIR CAB CBA SAB SBA A0–A

7

B0–B

7

Operation or Function

H
H

X
X

H or L H or L X

X

X
X

Input Input

Isolation
Store A and B Data

L
L

L
L

X
X

X
X

X
X

L
H

Output Input

Real Time B Data to A Bus
Stored B Data to A Bus

L
L

H
H

X

H or L

X
X

L
H

X
X

Input Output

Real Time A Data to B Bus
Stored A Data to B Bus

* The data output functions may be enabled or disabled by various signals at the G and DIR inputs. Data input functions are always enabled; i.e., data at the bus

pins will be stored on every LOW-to-HIGH transition of the appropriate clock inputs.

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Transition

1 OF 8 CHANNELS

D

0

C

0

D

0

C

0

CAB
SAB

DIR
CBA
SBA

G

B

0

A

0

TO 7 OTHER CHANNELS

LOGIC DIAGRAM

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

1

CAB

2

SAB

3

DIR

4

A

0

5

A

1

6

A

2

7

A

3

8

A

4

9

A

5

10

A

6

11

A

7

12

GND

24
23
22
21
20
19
18
17
16

14
13

V

CC

CBA
SBA
G
B

0

B

1

B

2

B

3

B

4

B

5

B

6

B

7

PIN NAMES

A0–A7 Data Register Inputs

Data Register A Outputs

B0–B

7

Data Register B Inputs

Data Register B Outputs
CAB, CBA Clock Pulse Inputs
SAB, SBA Transmit/Receive Inputs
DIR, G

Output Enable Inputs

15

MC74AC646 MC74ACT646

5-3

FACT DATA

MAXIMUM RATINGS*

Symbol Parameter Value Unit

V

CC

DC Supply Voltage (Referenced to GND) –0.5 to +7.0 V

V

in

DC Input Voltage (Referenced to GND) –0.5 to VCC +0.5 V

V

out

DC Output Voltage (Referenced to GND) –0.5 to VCC +0.5 V

I

in

DC Input Current, per Pin ±20 mA

I

out

DC Output Sink/Source Current, per Pin ±50 mA

I

CC

DC VCC or GND Current per Output Pin ±50 mA

T

stg

Storage Temperature –65 to +150 °C

* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended

Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

′AC 2.0 5.0 6.0

VCCSupply Voltage

′ACT 4.5 5.0 5.5

V

Vin, V

out

DC Input Voltage, Output Voltage (Ref. to GND) 0 V

CC

V

VCC @ 3.0 V 150

Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs

VCC @ 4.5 V 40 ns/V

r

, t

f

′AC Devices except Schmitt Inputs

VCC @ 5.5 V 25
VCC @ 4.5 V 10

tr, t

f

Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs

VCC @ 5.5 V 8.0

ns/V

T

J

Junction Temperature (PDIP) 140 °C

T

A

Operating Ambient Temperature Range –40 25 85 °C

I

OH

Output Current — High –24 mA

I

OL

Output Current — Low 24 mA

1. Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.

2. Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.

tr, t

f

Input Rise and Fall Time (Note 2)

MC74AC646 MC74ACT646

5-4

FACT DATA

DC CHARACTERISTICS

74AC 74AC

Symbol

Parameter

V

CC

(V)

TA = +25°C

TA =

–40°C to +85°C

Unit

Conditions

Typ Guaranteed Limits

V

IH

3.0 1.5 2.1 2.1 V

OUT

= 0.1 V

4.5 2.25 3.15 3.15 V or VCC – 0.1 V

5.5 2.75 3.85 3.85

V

IL

3.0 1.5 0.9 0.9 V

OUT

= 0.1 V

4.5 2.25 1.35 1.35 V or VCC – 0.1 V

5.5 2.75 1.65 1.65

V

OH

3.0 2.99 2.9 2.9 I

OUT

= –50 µA

4.5 4.49 4.4 4.4 V

5.5 5.49 5.4 5.4
*VIN = VIL or V

IH

3.0 2.56 2.46

–12 mA

4.5 3.86 3.76

V

I

OH

–24 mA

5.5 4.86 4.76 –24 mA

V

OL

3.0 0.002 0.1 0.1 I

OUT

= 50 µA

4.5 0.001 0.1 0.1 V

5.5 0.001 0.1 0.1
*VIN = VIL or V

IH

3.0 0.36 0.44

12 mA

4.5 0.36 0.44

V

I

OL

24 mA

5.5 0.36 0.44 24 mA

I

IN

5.5

±0.1

±1.0

µA

VI = VCC, GND

I

OZT

VI (OE) = VIL, V

IH

5.5 ±0.6 ±6.0 µA VI = VCC, GND
VO = VCC, GND

I

OLD

5.5 75 mA V

OLD

= 1.65 V Max

I

OHD

Output Current

5.5 –75 mA V

OHD

= 3.85 V Min

I

CC

5.5

8.080µA

VIN = VCC or GND

* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.

Minimum High Level
Input Voltage

Maximum Low Level
Input Voltage

Minimum High Level
Output Voltage

Maximum Low Level
Output Voltage

Maximum Input
Leakage Current

Maximum
3-State
Current

†Minimum Dynamic

Maximum Quiescent
Supply Current

MC74AC646 MC74ACT646

5-5

FACT DATA

AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)

74AC 74AC

Symbol

Parameter

VCC*

(V)

TA = +25°C
CL = 50 pF

TA = –40°C

to +85°C

CL = 50 pF

Unit

Fig.

No.

Min Typ Max Min Max

Propagation Delay

3.3 4.0 10.5 16.5 3.0 18.5

t

PLH

Clock to Bus 5.0 2.5 7.5 12 2.0 13

ns

3-6

Propagation Delay

3.3 3.0 9.5 14.5 2.5 16

t

PHL

Clock to Bus 5.0 2.0 6.5 10.5 1.5 11.5

ns

3-6

Propagation Delay

3.3 2.5 7.5 12 2.0 13.5

t

PLH

Bus to Bus 5.0 1.5 5.0 8.0 1.0 9.0

ns

3-5

Propagation Delay

3.3 1.5 7.5 12.5 1.5 13.5

t

PHL

Bus to Bus 5.0 1.5 5.0 9.0 1.0 9.5

ns

3-5

Propagation Delay
SBA or SAB to An or B

n

(w/An or Bn HIGH or LOW)

3.3

5.0

2.0

1.5

8.5

6.0

13.5101.5

1.5

15.5
11

Propagation Delay
SBA or SAB to An or B

n

(w/An or Bn HIGH or LOW)

3.3

5.0

1.5

1.5

8.5

6.0

13.5101.5

1.51511

3.3 2.5 7.0 11.5 2.0 12.5

t

PZH

to An or B

n

5.0 1.5 5.0 8.5 1.5 9.0

ns

3-7

3.3 2.5 7.5 12.5 2.0 14

t

PZL

to An or B

n

5.0 1.5 5.5 9.0 1.5 10

ns

3-8

3.3 3.0 8.0 12.5 2.5 13.5

t

PHZ

to An or B

n

5.0 2.0 6.5 10 2.0 11

ns

3-7

3.3 2.0 7.5 12 2.0 13.5

t

PLZ

to An or B

n

5.0 1.5 6.0 9.5 1.5 10.5

ns

3-8

3.3 2.0 6.5 11 1.5 12

t

PZH

5.0 1.5 5.0 7.5 1.0 8.5

ns

3-7

3.3 2.5 7.0 11.5 2.0 13

t

PZL

5.0 1.5 5.0 8.0 1.0 9.0

ns

3-8

3.3 2.5 7.5 11.5 1.5 12.5

t

PHZ

5.0 1.5 5.5 9.5 1.5 10

ns

3-7

3.3 1.5 7.5 12 1.5 13.5

t

PLZ

5.0 1.5 5.5 9.5 1.5 10.5

ns

3-8

* Voltage Range 3.3 V is 3.3 V ±0.3 V.

Voltage Range 5.0 V is 5.0 V ±0.5 V.

t

PLH

t

PHL

Enable Time
G

Enable Time
G

Disable Time
G

Disable Time
G

Enable Time
DIR to An or B

Enable Time
DIR to An or B

Disable Time
DIR to An or B

Disable Time
DIR to An or B

n

n

n

n

ns 3-6

ns 3-6

MC74AC646 MC74ACT646

5-6

FACT DATA

AC OPERATING REQUIREMENTS

74AC 74AC

Symbol

Parameter

VCC*

(V)

TA = +25°C
CL = 50 pF

TA = –40°C

to +85°C

CL = 50 pF

Unit

Fig.

No.

Typ Guaranteed Minimum

Setup Time, HIGH or LOW 3.3 2.0 5.0 5.5

t

s

Bus to Clock 5.0 1.5 4.0 4.5

ns

3-9

Hold Time, HIGH or LOW 3.3 –1.5 0 0

t

h

Bus to Clock 5.0 –0.5 0.5 1.0

ns

3-9

Clock Pulse Width 3.3 2.0 3.5 4.5

t

w

HIGH or LOW 5.0 2.0 3.5 3.5

ns

3-6

* Voltage Range 3.3 V is 3.3 V ±0.3 V.

Voltage Range 5.0 V is 5.0 V ±0.5 V.

DC CHARACTERISTICS

74ACT 74ACT

Symbol

Parameter

V

CC

(V)

TA = +25°C

TA =

–40°C to +85°C

Unit

Conditions

Typ Guaranteed Limits

V

IH

4.5 1.5 2.0 2.0

V

OUT

= 0.1 V

5.5 1.5 2.0 2.0

V

or VCC – 0.1 V

V

IL

4.5 1.5 0.8 0.8

V

OUT

= 0.1 V

5.5 1.5 0.8 0.8

V

or VCC – 0.1 V

V

OH

4.5 4.49 4.4 4.4

I

OUT

= –50 µA

5.5 5.49 5.4 5.4

V

*VIN = VIL or V

IH

4.5 3.86 3.76 V

–24 mA

5.5 4.86 4.76

I

OH

–24 mA

V

OL

4.5 0.001 0.1 0.1

I

OUT

= 50 µA

5.5 0.001 0.1 0.1

V

*VIN = VIL or V

IH

4.5 0.36 0.44 V

24 mA

5.5 0.36 0.44

I

OL

24 mA

I

IN

5.5

±0.1

±1.0

µA

VI = VCC, GND

∆I

CCT

Additional Max. ICC/Input 5.5 0.6 1.5 mA VI = VCC – 2.1 V

I

OZT

VI (OE) = VIL, V

IH

5.5 ±0.6 ±6.0 µA VI = VCC, GND
VO = VCC, GND

I

OLD

5.5 75 mA V

OLD

= 1.65 V Max

I

OHD

Output Current

5.5 –75 mA V

OHD

= 3.85 V Min

I

CC

5.5

8.080µA

VIN = VCC or GND

* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.

Minimum High Level
Input Voltage

Maximum Low Level
Input Voltage

Minimum High Level
Output Voltage

Maximum Low Level
Output Voltage

Maximum Input
Leakage Current

Maximum
3-State
Current

†Minimum Dynamic

Maximum Quiescent
Supply Current

MC74AC646 MC74ACT646

5-7

FACT DATA

AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)

74ACT 74ACT

Symbol

Parameter

VCC*

(V)

TA = +25°C
CL = 50 pF

TA = –40°C

to +85°C

CL = 50 pF

Unit

Fig.

No.

Min Typ Max Min Max

t

PLH

5.0

3.5

12.0

14.5

3.0

16.0ns3-6

t

PHL

5.0

4.0

12.0

14.5

3.5

16.0ns3-6

t

PLH

5.0

3.0

8.5

11.0

2.5

12.0ns3-5

t

PHL

5.0

2.5

8.5

11.0

2.0

12.0ns3-5

t

PLH

SBA or SAB to An or B

n

(w/An or Bn HIGH or LOW)

5.0

3.0

9.5

12.0

2.5

13.0ns3-6

t

PHL

SBA or SAB to An or B

n

(w/An or Bn HIGH or LOW)

5.0

3.0

9.5

12.0

2.5

13.0ns3-6

t

PZH

to An or B

n

5.0

2.0

9.0

11.0

1.5

12.0ns3-7

t

PZL

to An or B

n

5.0

3.5

9.0

11.0

3.0

12.0ns3-8

t

PHZ

to An or B

n

5.0

5.0

10.5

13.0

4.5

14.5ns3-7

t

PLZ

to An or B

n

5.0

3.5

10.0

12.5

3.0

14.0ns3-8

t

PZH

5.0

2.0

6.5

12.5

1.5

13.5ns3-7

t

PZL

5.0

3.5

6.5

12.5

3.0

13.5ns3-8

t

PHZ

5.0

5.0

8.5

12.5

4.5

13.5ns3-7

t

PLZ

5.0

3.5

8.5

12.5

3.0

13.5ns3-8

* Voltage Range 5.0 V is 5.0 V ±0.5 V.

Propagation Delay
Clock to Bus

Propagation Delay
Clock to Bus

Propagation Delay
Bus to Bus

Propagation Delay
Bus to Bus

Propagation Delay

Propagation Delay

Enable Time
G

Enable Time
G

Disable Time
G

Disable Time
G

Enable Time
DIR to An or B

Enable Time
DIR to An or B

Disable Time
DIR to An or B

Disable Time
DIR to An or B

n

n

n

n

MC74AC646 MC74ACT646

5-8

FACT DATA

AC OPERATING REQUIREMENTS

74ACT 74ACT

Symbol

Parameter

VCC*

(V)

TA = +25°C
CL = 50 pF

TA = –40°C

to +85°C

CL = 50 pF

Unit

Fig.

No.

Typ Guaranteed Minimum

t

s

5.0

7.0

8.0

ns

3-9

t

h

5.0

2.5

2.5

ns

3-9

t

w

5.0

7.0

8.0

ns

3-6

* Voltage Range 5.0 V is 5.0 V ±0.5 V.

CAPACITANCE

Symbol Parameter

Value

Typ

Unit Test Conditions

C

IN

Input Capacitance 4.5 pF VCC = 5.0 V

C

I/O

Input/Output Capacitance 15 pF VCC = 5.0 V

C

PD

Power Dissipation Capacitance 60 pF VCC = 5.0 V

Setup Time, HIGH or LOW
Bus to Clock

Hold Time, HIGH or LOW
Bus to Clock

Clock Pulse Width
HIGH or LOW

MC74AC646 MC74ACT646

5-9

FACT DATA

OUTLINE DIMENSIONS

N SUFFIX

PLASTIC DIP PACKAGE

CASE 724–03

ISSUE D

DW SUFFIX

PLASTIC SOIC PACKAGE

CASE 751E–04

ISSUE E

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.

–A–

–B– P12X

D24X

12

1324

1

M

0.010 (0.25) B

M

S

A

M

0.010 (0.25) B

S

T

–T–

G

22X

SEATING
PLANE

K

C

R

X 45

_

M

F

J

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A 15.25 15.54 0.601 0.612
B 7.40 7.60 0.292 0.299
C 2.35 2.65 0.093 0.104
D 0.35 0.49 0.014 0.019
F 0.41 0.90 0.016 0.035
G 1.27 BSC 0.050 BSC
J 0.23 0.32 0.009 0.013
K 0.13 0.29 0.005 0.011
M 0 8 0 8
P 10.05 10.55 0.395 0.415
R 0.25 0.75 0.010 0.029

____

NOTES:

1. CHAMFERED CONTOUR OPTIONAL.

2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.

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

4. CONTROLLING DIMENSION: INCH.

–A–

–B–

24 13

12

1

–T–

SEATING
PLANE

24 PL

K

E

F

N

C

D

G

M

A

M

0.25 (0.010) T

24 PLJ

M

B

M

0.25 (0.010) T

L

M

NOTE 1

DIM MIN MAX MIN MAX

MILLIMETERSINCHES

A 1.230 1.265 31.25 32.13
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.020 0.38 0.51

E 0.050 BSC 1.27 BSC
F 0.040 0.060 1.02 1.52

G 0.100 BSC 2.54 BSC

J 0.007 0.012 0.18 0.30

K 0.110 0.140 2.80 3.55

L 0.300 BSC 7.62 BSC
M 0 15 0 15
N 0.020 0.040 0.51 1.01

_ _ _ _

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MC74AC646/D

*MC74AC646/D*

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