74AC646SC Datasheet 74ACT646SC, 74AC646SCX, 74AC646SC | P4-P6

www.fairchildsemi.com 4

74AC646 • 74ACT646

Absolute Maximum Ratings(Note 2) Recommended Operating

Conditions

Note 2: Absolute maximum ratings are those values beyond which damage

to the device may occur. The databook specifications should be met, with-

out exception, to ensure that the system design is reliable over its power

supply, temperature, and output/input loading variables. Fairchild does not

recommend operation of FACT circuits outside databook specifications.

DC Electrical Characteristics for AC

Note 3: All outputs loaded; thresholds on input associated with output under test.

Note 4: Maximum test duration 2.0 ms, one output loaded at a time.

Note 5: I

IN

and I

CC

@ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V

CC

.

Supply Voltage (V

CC

) −0.5V to +7.0V

DC Input Diode Current (I

IK

)

V

I

= −0.5V −20 mA

V

I

= V

CC

+ 0.5V +20 mA

DC Input Voltage (V

I

) −0.5V to V

CC

+ 0.5V

DC Output Diode Current (I

OK

)

V

O

= −0.5V −20 mA

V

O

= V

CC

+ 0.5V +20 mA

DC Output Voltage (V

O

) −0.5V to V

CC

+ 0.5V

DC Output Source

or Sink Current (I

O

) ±50 mA

DC V

CC

or Ground Current

per Output Pin (I

CC

or I

GND

) ±50 mA

Storage Temperature (T

STG

) −65°C to +150°C

Junction Temperature (T

J

)

PDIP 140

°C

Supply Voltage (V

CC

)

AC 2.0V to 6.0V

ACT 4.5V to 5.5V

Input Voltage (V

I

) 0V to V

CC

Output Voltage (V

O

) 0V to V

CC

Operating Temperature (T

A

) −40°C to +85°C

Minimum Input Edge Rate (

∆V/∆t)

AC Devices

V

IN

from 30% to 70% of V

CC

V

CC

@ 3.3V, 4.5V, 5.5V 125 mV/ns

Minimum Input Edge Rate (

∆V/∆t)

ACT Devices

V

IN

from 0.8V to 2.0V

V

CC

@ 4.5V, 5.5V 125 mV/ns

Symbol Parameter

V

CC

T

A

= +25°C T

A

= −40°C to +85°C

Units Conditions

(V) Typ Guaranteed Limits

V

IH

Minimum HIGH Level 3.0 1.5 2.1 2.1 V

OUT

= 0.1V

Input Voltage 4.5 2.25 3.15 3.15 V or V

CC

− 0.1V

5.5 2.75 3.85 3.85

V

IL

Maximum LOW Level 3.0 1.5 0.9 0.9 V

OUT

= 0.1V

Input Voltage 4.5 2.25 1.35 1.35 V or V

CC

− 0.1V

5.5 2.75 1.65 1.65

V

OH

Minimum HIGH Level 3.0 2.99 2.9 2.9

Output Voltage 4.5 4.49 4.4 4.4 V I

OUT

= −50 µA

5.5 5.49 5.4 5.4

V

IN

= V

IL

or V

IH

3.0 2.56 2.46 I

OH

= −12 mA

4.5 3.86 3.76 V I

OH

= −24 mA

5.5 4.86 4.76 I

OH

= −24 mA (Note 3)

V

OL

Maximum LOW Level 3.0 0.002 0.1 0.1

Output Voltage 4.5 0.001 0.1 0.1 V I

OUT

= 50 µA

5.5 0.001 0.1 0.1

V

IN

= V

IL

or V

IH

3.0 0.36 0.44 I

OH

= 12 mA

4.5 0.36 0.44 V I

OL

= 24 mA

5.5 0.36 0.44 I

OH

= 24 mA (Note 3)

I

IN

(Note 5) Maximum Input Leakage Current 5.5 ± 0.1 ± 1.0 µAV

I

= V

CC

, GND

I

OLD

Minimum Dynamic 5.5 75 mA V

OLD

= 1.65V Max

I

OHD

Output Current (Note 4) 5.5 −75 mA V

OHD

= 3.85V Min

I

CC

(Note 5) Maximum Quiescent Supply Current 5.5 8.0 80.0 µAV

IN

= V

CC

or GND

I

OZT

Maximum I/O V

I

(OE) = V

IL

, V

IH

Leakage Current 5.5 ±0.6 ±6.0 µAV

I

= V

CC

, GND

V

O

= V

CC

, GND

5 www.fairchildsemi.com

74AC646 • 74ACT646

DC Electrical Characteristics for ACT

Note 6: All outputs loaded; thresholds on input associated with output under test.

Note 7: Maximum test duration 2.0 ms, one output loaded at a time.

Symbol Parameter

V

CC

T

A

= +25°C T

A

= −40°C to +85°C

Units Conditions

(V) Typ Guaranteed Limits

V

IH

Minimum HIGH Level 4.5 1.5 2.0 2.0

V

OUT

= 0.1V

Input Voltage 5.5 1.5 2.0 2.0 or V

CC

− 0.1V

V

IL

Maximum LOW Level 4.5 1.5 0.8 0.8

V

OUT

= 0.1V

Input Voltage 5.5 1.5 0.8 0.8 or V

CC

− 0.1V

V

OH

Minimum HIGH Level 4.5 4.49 4.4 4.4

VI

OUT

= −50 µA

Output Voltage 5.5 5.49 5.4 5.4

V

IN

= V

IL

or V

IH

4.5 3.86 3.76 V I

OH

= −24 mA

5.5 4.86 4.76 I

OH

= −24 mA (Note 6)

V

OL

Maximum LOW Level 4.5 0.001 0.1 0.1

VI

OUT

= 50 µA

Output Voltage 5.5 0.001 0.1 0.1

V

IN

= V

IL

or V

IH

4.5 0.36 0.44 V I

OL

= 24 mA

5.5 0.36 0.44 I

OL

= 24 mA (Note 6)

I

IN

Maximum Input

5.5 ± 0.1 ± 1.0 µAV

I

= V

CC

, GND

Leakage Current

I

CCT

Maximum

5.5 0.6 1.5 mA V

I

= V

CC

− 2.1V

I

CC

/Input

I

OLD

Minimum Dynamic 5.5 75 mA V

OLD

= 1.65V Max

I

OHD

Output Current (Note 7) 5.5 −75 mA V

OHD

= 3.85V Min

I

CC

Maximum Quiescent

5.5 8.0 80.0 µA

V

IN

= V

CC

Supply Current or GND

I

OZT

Maximum I/O V

I

(OE) = V

IL

, V

IH

Leakage Current 5.5 ±0.6 ±6.0 µAV

I

= V

CC

, GND

V

O

= V

CC

, GND

www.fairchildsemi.com 6

74AC646 • 74ACT646

AC Electrical Characteristics for AC

Note 8: Voltage Range 3.3 is 3.3V ± 0.3V

Voltage Range 5.0 is 5.0V ± 0.5V

AC Operating Requirements for AC

Note 9: Voltage Range 3.3 is 3.3V ± 0.3V

Voltage Range 5.0 is 5.0V ± 0.5V

V

CC

T

A

= +25°CT

A

= −40°C to +85°C

Symbol Parameter (V)

C

L

= 50 pF C

L

= 50 pF

Units

(Note 8) Min Typ Max Min Max

t

PLH

Propagation Delay 3.3 4.0 10.5 16.5 3.0 18.5

ns

Clock to Bus 5.0 2.5 7.5 12.0 2.0 13.0

t

PHL

Propagation Delay 3.3 3.0 9.5 14.5 2.5 16.0

ns

Clock to Bus 5.0 2.0 6.5 10.5 1.5 11.5

t

PLH

Propagation Delay 3.3 2.5 7.5 12.0 2.0 13.5

ns

Bus to Bus 5.0 1.5 5.0 8.0 1.0 9.0

t

PHL

Propagation Delay 3.3 1.5 7.5 12.5 1.5 13.5

ns

Bus to Bus 5.0 1.5 5.0 9.0 1.0 9.5

t

PLH

Propagation Delay 3.3 2.0 8.5 13.5 1.5 15.5

SBA or SAB to A

n

or B

n

5.0 1.5 6.0 10.0 1.5 11.0 ns

(w/ A

n

or B

n

HIGH or LOW)

t

PHL

Propagation Delay 3.3 1.5 8.5 13.5 1.5 15.0

SBA or SAB to A

n

or B

n

5.0 1.5 6.0 10.0 1.5 11.0 ns

(w/ A

n

or B

n

HIGH or LOW)

t

PZH

Enable Time 3.3 2.5 7.0 11.5 2.0 12.5

ns

G

to A

n

or B

n

5.0 1.5 5.0 8.5 1.5 9.0

t

PZL

Enable Time 3.3 2.5 7.5 12.5 2.0 14.0

ns

G to A

n

or B

n

5.0 1.5 5.5 9.0 1.5 10.0

t

PHZ

Disable Time 3.3 3.0 8.0 12.5 2.5 13.5

ns

G

to A

n

or B

n

5.0 2.0 6.5 10.0 2.0 11.0

t

PLZ

Disable Time 3.3 2.0 7.5 12.0 2.0 13.5

ns

G

to A

n

or B

n

5.0 1.5 6.0 9.5 1.5 10.5

t

PZH

Enable Time 3.3 2.0 6.5 11.0 1.5 12.0

ns

DIR to A

n

or B

n

5.0 1.5 5.0 7.5 1.0 8.5

t

PZL

Enable Time 3.3 2.5 7.0 11.5 2.0 13.0

ns

DIR to A

n

or B

n

5.0 1.5 5.0 8.0 1.0 9.0

t

PHZ

Disable Time 3.3 2.5 7.5 11.5 1.5 12.5

ns

DIR to A

n

or B

n

5.0 1.5 5.5 9.5 1.5 10.0

t

PLZ

Disable Time 3.3 1.5 7.5 12.0 1.5 13.5

ns

DIR to A

n

or B

n

5.0 1.5 5.5 9.5 1.5 10.5

V

CC

T

A

= +25°CT

A

= −40°C to +85°C

Symbol Parameter (V)

C

L

= 50 pF C

L

= 50 pF

Units

(Note 9) Typ Guaranteed Minimum

t

S

Setup Time, HIGH or LOW 3.3 2.0 5.0 5.5

ns

Bus to Clock 5.0 1.5 4.0 4.5

t

H

Hold Time, HIGH or LOW 3.3 −1.5 0 0

ns

Bus to Clock 5.0 −0.5 0.5 1.0

t

W

Clock Pulse Width 3.3 2.0 3.5 4.5

ns

HIGH or LOW 5.0 2.0 3.5 3.5

74AC646SC

74AC646SC

Products related to this Datasheet