Datasheet HD74LVC245A Datasheet (HIT)

HD74LVC245A

Octal Bidirectional Transceivers with 3-state Outputs

ADE-205-111B(Z)

3rd Edition

December 1996

Description

The HD74LVC245A has eight buffers with three state outputs in a 20 pin package. When (T / R) is high,
data flows from the A inputs to the B outputs, and when (T / R) is low, data flows from the B inputs to the
A outputs. A and B bus are separated by making enable input (OE) high level. Low voltage and high
speed operation is suitable at the battery drive product (note type personal computer) and low power
consumption extends the life of a battery for long time operation.

Features

• VCC = 2.0 V to 5.5 V

• All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V)

• All input outputs V

• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)

• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)

• High output current ±24 mA (@VCC = 3.0 V to 5.5 V)

(Max.) = 5.5 V (@VCC = 0 V or output off state)

I/O

Function Table

Inputs

OE T / R Operation

L L B data to A bus
L H A data to B bus
HX Z

H : High level
L : Low level
X : Immaterial
Z : High impedance

HD74LVC245A

Pin Arrangement

T / R

V

1

20

CC

A0

2
3

A1 B0

4

A2
A3

5

A4

6
7

A5
A6

8
9

A7

10

GND

19
18
17

16
15

14
13
12

11

OE

B1
B2

B3
B4
B5
B6
B7

(Top view)

Absolute Maximum Ratings

Item Symbol Ratings Unit Conditions

Supply voltage V
Input diode current I
Input voltage V
Output diode current I

Input / output voltage V

Output current I
VCC, GND current / pin I

IK

OK

O

CC

CC

I

I/O

or I

GND

Storage temperature Tstg –65 to 150 °C
Note: The absolute maximum ratings are values which must not individually be exceeded, and furthermore,

no two of which may be realized at the same time.

–0.5 to 6.0 V
–50 mA VI = –0.5 V
–0.5 to 6.0 V T / R, OE
–50 mA VO = –0.5 V
50 mA VO = V

+0.5 V

CC

–0.5 to VCC +0.5 V Output "H" or "L"
–0.5 to 6.0 V Output "Z" or VCC:OFF
±50 mA
100 mA

2

HD74LVC245A

Recommended Operating Conditions

Item Symbol Ratings Unit Conditions

Supply voltage V

Input / output voltage V

CC

I

V

I/O

Operating temperature Ta –40 to 85 °C
Output current I

Input rise / fall time

*1

OH

I

OL

tr, t

f

Notes: 1. This item guarantees maximum limit when one input switches.

Waveform : Refer to test circuit of switching characteristics.

2. duty cycle ≤ 50%

1.5 to 5.5 V Data retention

2.0 to 5.5 V At operation
0 to 5.5 V T / R, OE
0 to V

CC

V Output "H" or "L"

0 to 5.5 V Output "Z" or VCC:OFF

–12 mA VCC = 2.7 V

*2

–24

mA VCC = 3.0 V to 5.5 V

12 mA VCC = 2.7 V

*2

24

mA VCC = 3.0 V to 5.5 V

10 ns/V

3

HD74LVC245A

Electrical Characteristics

Item Symbol V

Input voltage V

Output voltage V

Input current I
Off state output current I

Output leak current I
Quiescent supply current I

V

V

∆I

IH

IL

OH

OL

IN

OZ

OFF

CC

CC

Ta = –40 to 85°C

(V) Min Max Unit Test Conditions

CC

2.7 to 3.6 2.0 — V

4.5 to 5.5 VCC×0.7 — V

2.7 to 3.6 — 0.8 V

4.5 to 5.5 — VCC×0.3 V

2.7 to 5.5 V

–0.2 — V IOH = –100 µA

CC

2.7 2.2 — V IOH = –12 mA

3.0 2.4 — V

3.0 2.2 — V IOH = –24 mA

4.5 3.8 — V

2.7 to 5.5 — 0.2 V IOL = 100 µA

2.7 — 0.4 V IOL = 12 mA

3.0 — 0.55 V IOL = 24 mA

4.5 — 0.55 V
0 to 5.5 — ±5.0 µAVIN = 5.5 V or GND

2.7 to 5.5 — ±5.0 µAVIN = VCC, GND
V

= 5.5 V or GND

OUT

0—20µAVIN / V

2.7 to 3.6 — ±10 µAVIN / V

2.7 to 5.5 — 10 µAVIN = V

= 5.5 V

OUT

= 3.6 to 5.5 V

OUT

or GND

OUT

3.0 to 3.6 — 500 µAVIN = one input at (V
other inputs at V

CC

–0.6)V,

CC

or GND

4

Switching Characteristics

Ta = –40 to 85°C

Item Symbol V

Propagation delay time t

Output enable time t

Output disable time t

Between outut pins skew *1t

Input capacitance C
Output capacitance C

t

t

t

t

PLH

PHL

ZH

ZL

ZH

LZ

OSLH

OSHL

IN

O

Note: 1. This parameter is characterized but not tested.

tos

LH

= | t

PLHm

- t

PLHn

|, tosHL = | t

(V) Min Typ Max Unit From (Input) To (Output)

CC

2.7 — — 8.0 ns A or B B or A

3.3±0.3 1.5 — 7.0 ns

5.0±0.5 — — 5.5 ns

2.7 — — 9.5 ns OE A or B

3.3±0.3 1.5 — 8.5 ns

5.0±0.5 — — 7.0 ns

2.7 — — 8.5 ns OE A or B

3.3±0.3 1.5 — 7.5 ns

5.0±0.5 — — 6.5 ns

2.7 — — — ns

3.3±0.3 — — 1.0 ns

5.0±0.5 — — 1.0 ns

2.7 — 3.0 — pF

2.7 — 15.0 — pF

- t

PHLn

|

PHLm

HD74LVC245A

5

HD74LVC245A

Test Circuit

V

CC

V

CC

OE

Input

Pulse
Generator

Z

out

= 50

Ω

A0

S1

B0

See Function Table

T / R

Note: 1. CL includes probe and jig capacitance.

Waveforms – 1

Output

C =

L

50 pF

50 ScopeΩ

Symbol

t / t

PLH PHL

t / t

ZH HZ

t / t

ZL LZ

500

450Ω

Ω

S2

Vcc=2.7V,

3.3±0.3V

OPEN

GND

6 V

OPEN

*1 See

under table

GND

S2

Vcc=5.0±0.5V

OPEN

GND

2×Vcc

Input

In phase output

10 %

t

r

V

t

PLH

90 %

ref

V

ref

90 %

t

f

V

IH

V

ref

10 %

t

PHL

V

ref

GND

V

OH

V

OL

6

Waveforms – 2

HD74LVC245A

t

f

OE

90 %

V

ref

10 %

Waveform - A

Waveform - B

Notes: 1. tr = 2.5 ns, tf = 2.5 ns

2. Input waveform : PRR = 10 MHz, duty cycle 50%

3. Waveform – A shows input conditions such that the output is "L" level when enable by the
output control.

4. Waveform – B shows input conditions such that the output is "H" level when enable by the
output control.

t

r

V

GND

≈V

V
V

≈V

50%Vcc

Vcc

GND

IH

OH1

OL

OH

OL1

90 %

V

ref

10 %

t

ZL

V

ref

t

ZH

V

ref

t

t

HZ

LZ

TEST

V

IH

V

ref

V

OH1

V

OL1

V + 0.3 V

OL

V – 0.3 V

OH

Vcc=2.7V,

3.3±0.3V

2.7 V Vcc

1.5 V
3 V

GND

Vcc=5.0±0.5V

7

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

M

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

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.
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intellectual property rights, in connection with use of the information contained in this document.

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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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