74ACT11646_技术文档

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SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993

DW PACKAGE

(TOP VIEW)

• Independent Registers for A and B Buses

• Multiplexed Real-Time and Stored Data

• Flow-Through Architecture Optimizes

G

A1

CAB

SAB

B1

1

28

27

26

25

24

PCB Layout

2

• Center-Pin V

and GND Configurations

Minimize High-Speed Switching Noise

A2

3

CC

A3

B2

4

A4

B3

5

• EPICt (Enhanced-Performance Implanted

GND

A5

6

23 B4

CMOS) 1-mm Process

7

22

21

20

19

18

17

16

15

V

CC

• 500-mA Typical Latch-Up Immunity at 125°C

8

9

B5

description

10

11

12

13

14

B6

These devices consist of bus transceiver circuits,

3-state outputs, D-type flip-flops, and control

circuitry arranged for multiplexed transmission of

data directly from the data bus or from the internal

storage registers. Data on the A or B bus will be

clocked into the registers on the low-to-high

transition of the appropriate clock pin (CAB or

CBA). Figure 1 illustrates the four fundamental

bus-management functions that can be performed

with the octal bus transceivers and registers.

A6

B7

A7

B8

A8

CBA

SBA

DIR

Enable (G) and direction (DIR) pins are provided to control the transceiver functions. In the transceiver mode,

data present at the high-impedance port may be stored in either register or in both. The select controls (SAB

and SBA) can multiplex stored and real-time (transparent mode) data. The circuitry used for select control will

eliminate the typical decoding glitch which occurs in a multiplexer during the transition between stored and

real-time data. The direction control determines which bus will receive data when enable G is active (low). In

the isolation mode (control G high), A data may be stored in one register and/or B data may be stored in the

other register.

When an output function is disabled, the input function is still enabled and may be used to store and transmit

data. Only one of the two buses, A or B, may be driven at a time.

The 74ACT11646 is characterized for operation from − 40°C to 85°C.

EPIC is a trademark of Texas Instruments Incorporated.

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Copyright  1993, Texas Instruments Incorporated

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2−1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

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ꢇꢃ ꢄꢂ ꢈꢉ ꢊ ꢋꢌ ꢉ ꢄꢍꢂ ꢎꢌ ꢃꢏ ꢐ ꢑꢏ ꢍꢉꢂꢎ ꢒꢉ ꢍꢏꢓ ꢐ ꢌꢄ ꢏꢍ

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ꢙ

SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993

1

G

L

14

DIR

L

28

CAB

X

16

CBA

X

27

15

SBA

L

1

G

L

14

DIR

H

28

CAB

X

16

CBA

X

27

SAB

L

15

SBA

X

SAB

X

REAL-TIME TRANSFER BUS B TO BUS A

REAL-TIME TRANSFER BUS A TO BUS B

1

G

X

H

14

DIR

X

28

CAB

↑

16

CBA

X

27

SAB

X

15

SBA

X

1

G

L

14

DIR

L

28

CAB

X

16

CBA

H or L

X

27

SAB

X

15

SBA

H

X

↑

X

L

H

H or L

H

X

↑

X

STORAGE FROM A, B, OR A AND B

TRANSFER STORED DATA TO A OR B

Figure 1. Bus-Management Functions

2−2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

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SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993

FUNCTION TABLE

DATA I/O

INPUTS

CBA

OPERATION OR FUNCTION

G

DIR

X

CAB

SAB

X

SBA

X

A1 THRU A8

B1 THRU B8

X

H

L

↑

X

†

Input

Unspecified

Store A, B unspecified

Store B, A unspecified

†

Input

X

↑

X

↑

H or L

X

↑

H or L

X

Store A and B Data

Isolation, hold storage

Input

Output

Input

X

L

X

L

Real-Time B Data to A Bus

Stored B Data to A Bus

Input

L

X

H or L

X

H

L

H

X

L

X

Real-Time A Data to B Bus

Stored A Data to B Bus

Output

L

H or L

X

H

X

†

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 on the clock inputs.

‡

logic symbol

functional block diagram (positive logic)

1

G1

1

G

G3

14

DIR

3 EN1 [BA]

14

DIR

16

3 EN2 [AB]

CBA

16

CBA

15

C4

G5

SBA

28

SBA

28

CAB

27

CAB

27

C6

SAB

G7

26

1 of 8

Channels

≥1

2

5

4D

B1

1D

C1

1

A1

1

≥1

6D

7

2

1

2

25

24

23

20

19

18

17

3

A1

26

A2

B2

B3

1D

C1

B1

4

A3

5

A4

B4

B5

10

A5

To Seven Other Channels

11

A6

B6

B7

B8

12

A7

13

A8

‡

This symbol is in accordance with ANSI/IEEE Std 91-1984

and IEC Publication 617-12.

2−3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

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SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993

†

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage range, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V

CC

Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to V

+ 0.5 V

CC

I

CC

Output voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to V

O

Input clamp current, I (V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

IK

I

CC

Output clamp current, I

(V < 0 or V > V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA

OK

O O CC

Continuous output current, I (V = 0 to V ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA

Continuous current through V

O

CC

or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA

Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 65°C to 150°C

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

recommended operating conditions

MIN

4.5

2

MAX

UNIT

V

Supply voltage

5.5

CC

IH

IL

High-level input voltage

Low-level input voltage

Input voltage

V

0.8

V

0

V

I

CC

Output voltage

V

O

CC

I

High-level output current

Low-level output current

Input transition rise or fall rate

Operating free-air temperature

−24

24

mA

ns/V

°C

OH

OL

Dt/Dv

0

10

T

−40

85

A

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

T

A

= 25°C

PARAMETER

TEST CONDITIONS

V

MIN

MAX

UNIT

CC

MIN

4.4

TYP

MAX

4.5 V

5.5 V

4.5 V

5.5 V

4.5 V

5.5 V

4.5 V

5.5 V

5 V

4.4

5.4

I

= − 50 mA

OH

5.4

3.94

4.94

3.8

V

OH

I

= − 24 mA

= − 75 mA

OH

4.8

‡

3.85

OH

0.1

0.44

1.65

5

I

= 50 mA

OL

0.36

V

OL

I

= 24 mA

OL

‡

= 75 mA

OL

§

I

A or B ports

V

= V or GND

0.5

0.1

8

mA

pF

OZ

O

CC

G or DIR

V = V

or GND

or GND,

1

I

CC

V = V

I = 0

O

80

CC

I

CC

¶

DI

CC

One input at 3.4 V, Other inputs at GND or V

CC

0.9

1

C

V = V

CC

or GND

4.5

12

i

I

V

= V

O CC

5 V

o

‡

§

¶

Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.

For I/O ports, the parameter I includes the leakage current.

OZ

This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or V

.

CC

2−4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

ꢀ ꢁ ꢂꢃ ꢄꢅꢅꢆ ꢁꢆ

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ꢙ

SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 2)

T

= 25°C

A

MIN

MAX

UNIT

MIN

0

MAX

f

t

Clock frequency

105

0

4.8

4.5

2.5

105

MHz

ns

clock

Pulse duration, CAB or CBA high or low

Setup time, A before CLK↑ or B before CBA↑

Hold time, A after CAB↑ or B after CBA↑

4.8

4.5

2.5

w

ns

su

h

ns

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 2)

T = 25°C

A

FROM

(INPUT)

TO

(OUTPUT)

PARAMETER

MIN

MAX

UNIT

MIN

105

1.5

TYP

MAX

f

105

1.5

MHz

max

PLH

PHL

PZH

t

7.3

7.2

7.7

9.2

8.6

7.8

8.8

10

10.1

11

11.5

12

A or B

B or A

A or B

ns

t

12.8

13.8

10.7

9.7

14.4

15.3

11.6

10.6

13.5

14.9

15.3

16.5

11.3

10.3

11.5

13.5

12.4

13.1

G

t

PZL

t

PHZ

t

PLZ

PLH

PHL

PZH

t

11.9

13.4

13.7

14.8

10.5

9.5

CBA or CAB

DIR

t

10.2

10.9

7.9

7.3

6.7

9.1

8

t

PZL

PHZ

t

DIR

t

PLZ

PLH

PHL

PLH

PHL

t

10.3

12.1

10.9

11.9

SBA or SAB

( A or B high)

SBA or SAB

( A or B low)

8.1

operating characteristics, V

= 5 V, T = 25°C

A

CC

PARAMETER

TEST CONDITIONS

= 50 pF, f = 1 MHz

L

TYP

UNIT

Outputs enabled

Outputs disabled

63

14

C

Power dissipation capacitance per transceiver

C

pF

pd

2−5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

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ꢙ

SCAS061A − D2957, JULY 1987 − REVISED APRIL 1993

PARAMETER MEASUREMENT INFORMATION

2 × V

CC

S1

500 Ω

Open

GND

From Output

Under Test

TEST

/t

S1

t

Open

PLH PHL

t

/t

2 × V

CC

GND

PLZ PZL

C

= 50 pF

L

500 Ω

t

/t

(see Note A)

PHZ PZH

LOAD CIRCUIT

3 V

0 V

Timing Input

(see Note B)

1.5 V

t

w

t

h

t

3 V

su

3 V

0 V

Input

1.5 V

Data Input

0 V

VOLTAGE WAVEFORMS

Output

Control

(low-level

enabling)

3 V

0 V

3 V

0 V

Input

(see Note B)

1.5 V

t

PZL

t

PHL

PLH

t

PLZ

Output

Waveform 1

V

OH

[ V

CC

In-Phase

Output

50% V

CC

50% V

CC

V

CC

20% V

S1 at 2 × V

(see Note C)

CC

V

OL

t

PHZ

t

PLH

t

PHL

PZH

Output

Waveform 2

S1 at GND

V

OH

V

OH

Out-of-Phase

Output

80% V

CC

50% V

CC

[ 0 V

V

OL

(see Note C)

VOLTAGE WAVEFORMS

NOTES: A. C includes probe and jig capacitance.

VOLTAGE WAVEFORMS

L

B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z = 50 Ω, t = 3 ns, t = 3 ns.

O

r

f

C. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

D. The outputs are measured one at a time with one input transition per measurement.

Figure 2. Load Circuit and Voltage Waveforms

2−6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77001

PACKAGE OPTION ADDENDUM

www.ti.com

30-Mar-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

SOIC

PDIP

Drawing

74ACT11646DW

74ACT11646DWR

74ACT11646NT

OBSOLETE

DW

28

TBD

Call TI

DW

NT

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is

provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the

accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take

reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on

incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited

information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI

to Customer on an annual basis.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

30-Mar-2005

PACKAGING INFORMATION

Orderable Device

Status ⁽¹⁾

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

SOIC

PDIP

Drawing

74ACT11646DW

74ACT11646DWR

74ACT11646NT

OBSOLETE

DW

28

TBD

Call TI

DW

NT

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2)

Eco Plan

-

The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS

&

no Sb/Br)

-

please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered

at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame

retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

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to Customer on an annual basis.

Addendum-Page 1

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Applications

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www.ti.com/audio

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DLP® Products

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power.ti.com

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www.ti.com/automotive

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RFID

microcontroller.ti.com

www.ti-rfid.com

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www.ti.com/wireless-apps

RF/IF and ZigBee® Solutions www.ti.com/lprf

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型号：	74ACT11646
厂家：	TEXAS INSTRUMENTS
描述：	OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS 八路总线收发器和具备三态输出寄存器总线收发器输出元件
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