Datasheet HD74HCT245 Datasheet (HIT)

HD74HCT245

Octal Bus Transceivers (with 3-state outputs)

Description

This device has an active low enable input G and a direction control input (DIR). When DIR is high, data
flows from the A inputs to the B outputs. When DIR is low, data flows from the B inputs to the A outputs.
The HD74HCT245 transfers true data from one bus to the other.

This device does not have schmitt trigger inputs.

Features

• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility

• High Speed Operation: tpd (A to Y) = 12 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 4.5 to 5.5 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

Function Table

Enable G Direction Control DIR Operation

L L B data to A bus
L H A data to B bus
H X Isolation

H : High level
L : Low level
X : Irrelevant

HD74HCT245

Pin Arrangement

DIR

A

1
2

1

20
19

V

CC

Enable G
A2
A3
A4
A5
A6
A7
A8

GND

3
4
5
6
7
8
9

10

18
17
16
15
14
13
12
11

B

B2

B3

B4

B5

B6

B7

B8

1

(Top view)

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage range V
Input voltage V
Output voltage V
DC current drain per pin I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power dissipation per package P

CC

IN

OUT

OUT

GND

IK

OK

T

Storage temperature Tstg –65 to +150 °C

–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V

±35 mA
±75 mA
±20 mA
±20 mA

500 mW

2

HD74HCT245

DC Characteristics

Ta = –40 to

Ta = 25°C

Item Symbol Min Typ Max Min Max Unit V

Input voltage V

Output voltage V

IH

V

IL

OH

2.0 — — 2.0 — V 4.5 to

— — 0.8 — 0.8 V 4.5 to

4.4 — — 4.4 — V 4.5 Vin = VIH or VILIOH = –20 µA

4.18 — — 4.13 — 4.5 IOH = –6 mA

V

OL

— — 0.1 — 0.1 V 4.5 Vin = VIH or VILIOL = 20 µA
— — 0.26 — 0.33 4.5 IOL = 6 mA

Off-state output

I

OZ

——±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL,

current
Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND
Quiescent current I

CC

— — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA

+85°C Test Conditions

(V)

CC

5.5

5.5

Vout = V

or GND

CC

AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)

Ta = –40 to

Ta = 25°C

Item Symbol Min Typ Max Min Max Unit V

Propagation delay t
time t
Output enable t
time t
Output disable t
time t
Output rise/fall

time

PLH

PHL

ZL

ZH

LZ

HZ

t

TLH

t

THL

— 11 22 — 28 ns 4.5
— 13 22 — 28 4.5
— 17 30 — 38 ns 4.5
— 14 30 — 38 4.5
— 20 30 — 38 ns 4.5
— 22 30 — 38 4.5
— 4 12 — 15 ns 4.5

Input capacitance Cin — 5 10 — 10 pF —

+85°C Test Conditions

(V)

CC

3

24.50

25.40 Max

Unit: mm

1120

6.30

1

0.89

1.27 Max

2.54 ± 0.25

1.30

10

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

20

Unit: mm

12.6

13 Max

11

5.5

1

0.80 Max

1.27

*0.42 ± 0.08

0.40 ± 0.06

*Dimension including the plating thickness

Base material dimension

10

0.12

0.10 ± 0.10

0.15

M

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

20

Unit: mm

12.8

13.2 Max
11

7.50

1

0.935 Max

1.27

*0.42 ± 0.08

0.40 ± 0.06

*Dimension including the plating thickness

Base material dimension

10

0.12

0.20 ± 0.10

0.15

M

2.65 Max

10.40

0.25 ± 0.04

*0.27 ± 0.05

0.70

Hitachi Code
JEDEC
EIAJ
Weight

(reference value)

+ 0.25
– 0.40

1.45

+ 0.57
– 0.30

0° – 8°

FP-20DB
Conforms
—

0.52 g

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

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of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.

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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
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