MC74AC646(2001) Просмотр технического описания (PDF) - ON Semiconductor

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MC74AC646
(Rev.:2001)

Octal Transceiver/Register with 3-State Outputs (Non-inverting)

ON Semiconductor 

MC74AC646, MC74ACT646

FUNCTION TABLE

Inputs

G

DIR CAB CBA SAB SBA

Data I/O*

A0–A7

B0–B7

Operation or Function

H

X

H or L H or L

X

X

H

X

X

X

Input

Input

Isolation

Store A and B Data

L

L

X

X

X

L

L

L

X

X

X

H

Output

Input

Real Time B Data to A Bus

Stored B Data to A Bus

L

H

X

X

L

X

L

H

H or L

X

H

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.

NOTE: H = HIGH Voltage Level; L = LOW Voltage Level; X = Immaterial; = LOW–to–HIGH Transition

MAXIMUM RATINGS*

Symbol

Parameter

Value

Unit

VCC

Vin

Vout

Iin

Iout

ICC

Tstg

DC Supply Voltage (Referenced to GND)

DC Input Voltage (Referenced to GND)

DC Output Voltage (Referenced to GND)

DC Input Current, per Pin

DC Output Sink/Source Current, per Pin

DC VCC or GND Current per Output Pin

Storage Temperature

–0.5 to +7.0

V

–0.5 to VCC +0.5

V

–0.5 to VCC +0.5

V

±20

mA

±50

mA

±50

mA

–65 to +150

°C

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

mended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

Symbol

Parameter

Min

Typ

Max

VCC

Supply Voltage

′AC

′ACT

2.0

5.0

6.0

4.5

5.0

5.5

Vin, Vout

tr, tf

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

Input Rise and Fall Time (Note 1)

′AC Devices except Schmitt Inputs

0

VCC @ 3.0 V

–

VCC @ 4.5 V

–

VCC @ 5.5 V

–

–

VCC

150

–

40

–

25

–

tr, tf

Input Rise and Fall Time (Note 2)

′ACT Devices except Schmitt Inputs

VCC @ 4.5 V

–

10

–

VCC @ 5.5 V

–

8.0

–

TJ

Junction Temperature (PDIP)

TA

Operating Ambient Temperature Range

–

–

140

–40

25

85

IOH

Output Current – High

IOL

Output Current – Low

–

–

–24

–

–

24

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.

Unit

V

V

ns/V

ns/V

°C

°C

mA

mA

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