Datasheet HD74ACT245, HD74AC245 Datasheet (HIT)

Page 1

HD74AC245/HD74ACT245

Octal Bidirectional Transceiver with 3-State Input/Output

Description

The HD74AC245/HD74ACT245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active-High) enables data from A ports to B ports; Receive (active-Low) enables data from B ports to A ports. The Output Enable input, when High, disables, both A and B ports by placing them in a High Z condition.

Features

• Noninverting Buffers

• Bidirectional Data Path

• A and B Outputs Source/Sink 24 mA

• HD74ACT245 has TTL-Compatible Inputs

Pin Names

OE Output Enable Input T/R Transmit/Receive Input A0 to A7Side A 3-State Inputs or 3-State Outputs B0 to B7Side B 3-State Inputs or 3-State Outputs

Page 2

HD74AC245/HD74ACT245

Pin Arrangement

Truth Tables

GND

10 11

(Top view)

20T/R VCC

Inputs OE T/R Outputs

L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z State

H : High Voltage Level L : Low Voltage Level X : Immaterial

Page 3

HD74AC245/HD74ACT245

DC Characteristics (unless otherwise specified)

Item Symbol Max Unit Condition

Maximum quiescent supply current I

Maximum additional ICC/input

CCT

(HD74ACT245)

AC Characteristics: HD74AC245

80 µAV

8.0 µAV

1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V,

= VCC or ground, VCC = 5.5 V,

Ta = Worst case

= VCC or ground, VCC = 5.5 V,

Ta = 25°C

Ta = Worst case

Item Symbol V

Propagation delay t

PLH

Ta = +25°C C

= 50 pF

(V)*1Min Typ Max Min Max Unit

3.3 1.0 5.0 8.5 1.0 9.0 ns

Ta = –40°C to +85°C CL = 50 pF

Data to output 5.0 1.0 3.5 6.5 1.0 7.0 Propagation delay t

PHL

3.3 1.0 5.0 8.5 1.0 9.0 ns Data to output 5.0 1.0 3.5 6.0 1.0 7.0 Output enable time t

PZH

3.3 1.0 7.0 11.5 1.0 12.5 ns

5.0 1.0 5.0 8.5 1.0 9.0 Output enable time t

PZL

3.3 1.0 7.5 12.0 1.0 13.5 ns

5.0 1.0 5.5 9.0 1.0 9.5 Output disable time t

PHZ

3.3 1.0 6.5 12.0 1.0 12.5 ns

5.0 1.0 5.5 9.0 1.0 10.0 Output disable time t

PLZ

3.3 1.0 7.0 11.5 1.0 13.0 ns

5.0 1.0 5.5 9.0 1.0 10.0 Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V

Voltage Range 5.0 is 5.0 V ± 0.5 V

Page 4

HD74AC245/HD74ACT245

AC Characteristics: HD74ACT245

Item Symbol V

Propagation delay

PLH

Ta = +25°C C

= 50 pF

(V)*1Min Typ Max Min Max Unit

5.0 1.0 4.0 7.5 1.0 8.0 ns

Ta = –40°C to +85°C CL = 50 pF

Data to output Propagation delay

PHL

5.0 1.0 4.0 8.0 1.0 9.0 ns Data to output

Output enable time t Output enable time t Output disable time t Output disable time t

PZH

PZL

PHZ

PLZ

5.0 1.0 5.0 10.0 1.0 11.0 ns

5.0 1.0 5.5 10.0 1.0 12.0 ns

5.0 1.0 5.5 10.0 1.0 11.0 ns

5.0 1.0 5.0 10.0 1.0 11.0 ns Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V

Capacitance

Item Symbol Typ Unit Condition

Input capacitance C Input/output capacitance C Power dissipation capacitance C

I/O

4.5 pF VCC = 5.5 V

15.0 pF VCC = 5.5 V

45.0 pF VCC = 5.0 V

Page 5

24.50

25.40 Max

Unit: mm

1120

6.30

0.89

1.27 Max

2.54 ± 0.25

1.30

0.48 ± 0.10

7.00 Max

0.51 Min

2.54 Min 5.08 Max

Hitachi Code JEDEC EIAJ Weight

7.62

+ 0.11

0.25

– 0.05

0° – 15°

(reference value)

DP-20N — Conforms

1.26 g

Page 6

Unit: mm

12.6

13 Max

5.5

0.80 Max

1.27

*0.42 ± 0.08

0.40 ± 0.06

*Dimension including the plating thickness

Base material dimension

0.12

0.10 ± 0.10

0.15

2.20 Max

7.80

0.20 ± 0.04

*0.22 ± 0.05

0.70 ± 0.20

Hitachi Code JEDEC EIAJ Weight

(reference value)

+ 0.20 – 0.30

1.15

0° – 8°

FP-20DA — Conforms

0.31 g

Page 7

Unit: mm

12.8

13.2 Max 11

7.50

0.935 Max

1.27

*0.42 ± 0.08

0.40 ± 0.06

*Dimension including the plating thickness

Base material dimension

0.12

0.20 ± 0.10

0.15

2.65 Max

10.40

0.25 ± 0.04

*0.27 ± 0.05

0.70

Hitachi Code JEDEC EIAJ Weight

+ 0.25 – 0.40

1.45

+ 0.57 – 0.30

(reference value)

0° – 8°

FP-20DB Conforms —

0.52 g

Page 8

20 11

110

+0.08

*0.22

–0.07

0.20 ± 0.06

6.50

6.80 Max

0.65 Max

0.65

0.13

Unit: mm

4.40

1.0

6.40 ± 0.20

0.10

1.10 Max

*Dimension including the plating thickness

Base material dimension

0.15 ± 0.04

*0.17 ± 0.05

+0.03

–0.04

0.07

0° – 8°

Hitachi Code JEDEC EIAJ

(reference value)

Weight

0.50 ± 0.10

TTP-20DA — —

0.07 g

Page 9

Cautions

1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document.

2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use.

3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support.

4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product.

5. This product is not designed to be radiation resistant.

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7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products.

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