Datasheet MC74F640DW, MC74F640J, MC74F640N Datasheet (Motorola)

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Printed on:Mon, Feb 6, 1995 09:51:45
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Document:MC74F640 (5) VIEW
Last saved on:Fri, Feb 3, 1995 16:10:59

H = High Voltage Level
L = Low Voltage Level
X = Don’t Care
Z = High Impedance “Off” State

4-238

FAST AND LS TTL DATA

OCTAL BUS TRANSCEIVER,
INVERTING WITH 3-STATE OUTPUTS

The MC74F640 is an octal transceiver featuring inverting 3-state bus com­patible outputs in both transmit and receive directions. The B port outputs are
capable of sinking 64 mA and sourcing 15 mA, providing very good capacitive
drive characteristics. The device features an Output Enable (OE

) input for

easy cascading and Transmit/Receive (T/R

) input for direction control. The
3-state outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.

• High-Impedance NPN Base Inputs for Reduced Loading

(70 µA in High and Low States)

• Ideal for Applications which Require High-Output Drive and Minimal

Bus Loading

• Inverting Version of F245

• Octal Bidirectional Bus Interface

• 3-State Buffer Outputs Sink 64 mA and Source 15 mA

• ESD Sensitive — 4000 V HBM

PIN ASSIGNMENT

18 17 16 15 14 13

1 2 3 4 5 6

7

20 19

8

V

CC

T/R

OE B0B1B

2

B

4

B

3

B

5

A0A1A2A3A4A5A

6

9 10

A7GND

12 11

B6B

7

FUNCTION TABLE

Inputs

OE T/R

Outputs

L
L
H

L
H
X

Bus B data to Bus A
Bus A data to Bus B
Z

MC74F640

OCTAL BUS TRANSCEIVER,

INVERTING WITH

3-STATE OUTPUTS

FAST SCHOTTKY TTL

ORDERING INFORMATION

MC74FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03

LOGIC SYMBOL

A0A1A2A3A4A5A6A

7

B0B1B2B3B4B5B6B

7

T/R

OE

2 3 4 5 6 7 8 9

1112131415161718

1

19

4-239

FAST AND LS TTL DATA

MC74F640

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

DC Supply Voltage 74 4.5 5.0 5.5 V

T

A

Operating Ambient Temperature Range 74 0 25 70 °C

I

OH

Output Current — High An Outputs 74 –3.0 mA

I

OH

Output Current — High Bn Outputs 74 –15 mA

I

OL

Output Current — Low An Outputs 74 24 mA

I

OL

Output Current — Low Bn Outputs 74 64 mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min Typ Max

Unit

Test Conditions

1

V

IH

Input HIGH Voltage 2.0 V Guaranteed as a HIGH Signal

V

IL

Input LOW Voltage 0.8 V Guaranteed as a LOW Signal

V

IK

Input Clamp Diode Voltage –1.2 V VCC = MIN, IIN = –18 mA

74 2.4 3.3 V IOH = –3.0 mA VCC = 4.5 V

A

n

74 2.7 3.3 V IOH = –3.0 mA VCC = 4.75 V

V

OH

Output HIGH Voltage

74 2.4 3.4 V IOH = –3.0 mA VCC = 4.5 V

OH

B

n

74 2.7 3.4 V IOH = –3.0 mA VCC = 4.75 V

n

74 2.0 V IOH = –15 mA VCC = 4.5 V

V

OL

Output LOW Voltage A

n

74 0.35 0.5 V IOL = 24 mA VCC = MIN

V

OL

Output LOW Voltage B

n

74 0.55 V IOL = 64 mA VCC = MIN

I

OZH

+ I

IH

Output Off Current HIGH 70 µA VCC = MAX V

OUT

= 2.7 V

I

OZL

+ I

IL

Output Off Current LOW –70 µA VCC = MAX V

OUT

= 0.5 V

OE, T/R 40 µA VCC = MAX, VIN = 2.7 V

I

IH

Input HIGH Current

OE, T/R 100 µA VCC = 0 V, VIN = 7.0 V

IH

Others 1.0 mA VCC = MAX, VIN = 5.5 V

I

IL

Input LOW Current OE, T/R –40 µA VCC = MAX, VIN = 0.5 V

A0–A

7

–60 –150

IOSOutput Short Circuit Current

2

B0–B

7

–100 –225

mA

VCC = MAX, V

OUT

= GND

I

CCH

85

V

out

= HIGH

T/R

= 4.5 V

I

CC

Power Supply Current

I

CCL

120

mA

V

out

= LOW

T/R

= 0 V

VCC = MAX

I

CCZ

100

OE = 4.5 V
V

out

= HIGH Z

NOTES:

1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type.

2. Not more than one output should be shorted at a time, nor for more than 1 second.

4-240

FAST AND LS TTL DATA

MC74F640

A

0

A

1

A

2

A

3

A

4

A

5

A

6

A

7

B

0

B

1

B

2

B

3

B

4

B

5

B

6

B

7

2

3 4 5 6 7 8 9

18

17 16 15 14 13 12 11

19

1

OE

T/R

VCC = PIN 20
GND = PIN 10

LOGIC DIAGRAM

AC ELECTRICAL CHARACTERISTICS

74F 74F

TA = +25°C

VCC = +5.0 V

CL = 50 pF
RL = 500 Ω

TA = 0°C to +70°C

VCC = +5.0 V ±10%

CL = 50 pF
RL = 500 Ω

Symbol

Parameter

Min Typ Max Min Typ Max

Unit

t

PLH

t

PHL

Propagation Delay
An to Bn, Bn to A

n

2.0

1.0

7.0

5.0

2.0

1.0

8.0

5.5

ns

t

PZH

t

PZL

Output Enable Time
to High or Low Level

3.5

6.0

11
11

3.5

6.0

13
12

ns

t

PHZ

t

PLZ

Output Disable Time
to High or Low Level

1.5

1.0

8.0

7.0

1.5

1.0

9.0

7.5

ns