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4-403

FAST AND LS TTL DATA

OCTAL BIDIRECTIONAL

TRANSCEIVER WITH 8-BIT PARITY

GENERATOR CHECKER

(3-STATE OUTPUTS)

The MC74F657A and MC74F657B are Octal Bidirectional Transceivers

with an 8-bit parity Generator/Checker and 3-state outputs.

The A and B options are faster versions of the F657 and contain eight non-

inverting buffers with 3-state outputs and an 8-bit parity generator/checker.

These devices are intended for bus-oriented applications. The buffers have

a guaranteed current sinking capability of 24 mA at the A ports and 64 mA at

the B ports. The Transmit/Receiver (T/R) input determines the direction of the

data flow through the bidirectional transceivers. Transmit (active HIGH) en-

ables data from A ports to B ports; Receive (active LOW) enables data from

B ports to A ports.

•

High-Impedance NPN Base Input for Reduced Loading (20

A in

HIGH and LOW States)

•

Ideal in Applications Where High Output Drive and Light Bus Loading

are Required (IIL is 20

A versus Fast std of 600

•

Combines F245 and F280A Functions in One Package

•

3-State Outputs

•

B Outputs, PARITY, ERROR, Sink 64 mA and Source 15 mA

•

15 mA Source Current

•

Input Diodes for Termination Effects

•

Glitchless Outputs During Power Up and Power Down

•

High Impedance Outputs During Power Off

•

ESD Protection > 4000 Volts

PIN ASSIGNMENT

T/R

B0 B1 B2 B3

GND

A0 A1 A2 A3 A4 VCC A5

ERROR

PARITY

ODD/

EVEN

LOGIC SYMBOL

EVEN/ODD

PARITY

T/R

B0 B1 B2 B3 B4 B5 B6 B7

23 22

16 15

ERROR

A0 A1 A2 A3 A4 A5 A6 A7

MC74F657A,B

OCTAL BIDIRECTIONAL

TRANSCEIVER WITH 8-BIT PARITY

GENERATOR CHECKER

(3-STATE OUTPUTS)

FAST

™

SCHOTTKY TTL

ORDERING INFORMATION

MC74FXXXAJ/BJ

Ceramic

MC74FXXXAN/BN

Plastic

MC74FXXXADW/BDW

SOIC

N SUFFIX

PLASTIC

CASE 724-03

DW SUFFIX

SOIC

CASE 751E-03

J SUFFIX

CERAMIC

CASE 758-01

4-404

FAST AND LS TTL DATA

MC74F657A, B

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

4.5

5.0

5.5

Operating Ambient

Temperature Range

IOH

Output Current — High

–3.0/–15

IOL

Output Current — Low

24/64

FUNCTION TABLE

Number of

Inputs That are High

Inputs

Input/Output

Outputs

T/R

Even/Odd

Parity

Error

Outputs Mode

Transmit

Receive

0, 2, 4, 6, 8

Receive

Number of

Inputs That are High

Inputs

Input/Output

Outputs

T/R

Even/Odd

Parity

Error

Outputs Mode

Transmit

Receive

1, 3, 5, 7

Receive

Don’t Care

H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care; Z = HIGH impedance state.

4-405

FAST AND LS TTL DATA

MC74F657A, B

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

Guaranteed Input HIGH Voltage

VIL

Input LOW Voltage

0.8

Guaranteed Input LOW Voltage

VIK

Input Clamp Diode Voltage

–0.73

–1.2

VCC = MIN, IIN = –18 mA

Output HIGH Voltage

All Outputs

2.4

IOH = –3.0 mA

VCC = 4.5 V

VOH

Output HIGH Voltage

2.7

3.4

IOH = –3.0 mA

VCC = 4.75 V

Output HIGH Voltage

B0–B7

PARITY,

ERROR

2.0

IOH = –15 mA

VCC = 4.5 V

Output LOW Voltage

A0–A7

0.35

0.5

IOL = 24 mA

VCC = MIN

VOL

Output LOW Voltage

B0–B7

PARITY,

ERROR

0.4

0.55

IOL = 64 mA

VCC = MIN

IIH

Input HIGH Current

T/R, OE, EVEN/ODD

100

VCC = 0 V, VIN = 7.0 V

IIH

Input HIGH Current

A0–A7

2.0

VCC = 5.5 V, VIN = 5.5 V

IIH

Input HIGH Current

B0–B7, PARITY

1.0

VCC = 5.5 V, VIN = 5.5 V

EVEN/ODD

VCC = MAX, VIN = 2.7 V

T/R, OE

VCC = MAX, VIN = 2.7 V

IIL

Input LOW Current

EVEN/ODD

–20

VCC = MAX, VIN = 0.5 V

IIL

Input LOW Current

T/R, OE

–40

VCC = MAX, VIN = 0.5 V

IIH

+IOZH

Off-State Current HIGH

Level Voltage Applied

A0–A7

B0–B7

PARITY

VCC = MAX, VOUT = 2.7 V

IIL

+IOZL

Off-State Current LOW

Level Voltage Applied

B0–B7

PARITY

–70

VCC = MAX, VOUT = 0.5 V

IOZH

Off-State Output Current,

High-Level Voltage Applied

VCC = MAX, VOUT = 2.7 V

IOZL

Off-State Output Current,

Low-Level Voltage Applied

ERROR

–50

VCC = MAX, VOUT = 0.5 V

IOS

Output Short Circuit

Current (Note 2)

An Outputs

–60

–150

VCC = MAX, VOUT = 0 V

IOS

Output Short Circuit

Current (Note 2)

PARITY, Bn Outputs,

ERROR

–100

–225

VCC = MAX, VOUT = 0 V

ICC

Total Supply Current

ICCH

135

VCC = MAX

ICC

Total Supply Current

ICCL

106

150

VCC = MAX

ICCZ

145

CC = MAX

NOTES:

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

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

4-406

FAST AND LS TTL DATA

MC74F657A, B

F657A

AC ELECTRICAL CHARACTERISTICS

Symbol

Parameter

74F

Unit

Symbol

Parameter

TA = +25

VCC = +5.0 V

CL = 50 pF

TA = 0

C to +70

VCC = +5.0 V

10%

CL = 50 pF

Unit

Symbol

Parameter

Min

Typ

Max

Min

Max

Unit

tPLH

tPHL

Propagation Delay

2.0

7.0

2.0

7.5

PLH

tPHL

An to Bn or Bn to An

2.0

7.0

2.0

7.5

tPLH

Propagation Delay

6.0

5.5

tPHL

An to PARITY

6.5

tPLH

Propagation Delay

4.5

10.5

4.5

tPHL

EVEN/ODD to PARITY, ERROR

4.5

10.5

4.5

11.5

tPLH

Propagation Delay

7.0

6.5

tPHL

Bn to ERROR

7.0

6.5

tPLH

Propagation Delay

8.0

7.0

tPHL

PARITY to ERROR

7.0

tPZH

Output Enable Time

3.0

8.0

3.0

9.0

tPZL

to HIGH or LOW Level

4.0

9.0

4.0

tPHZ

tPLZ

Output Disable Time

2.0

7.5

2.0

8.0

PHZ

tPLZ

from HIGH or LOW Level

2.0

6.0

2.0

6.5

F657B

AC ELECTRICAL CHARACTERISTICS

Symbol

Parameter

74F

Unit

Symbol

Parameter

TA = +25

VCC = +5.0 V

CL = 50 pF

TA = 0

C to +70

VCC = +5.0 V

10%

CL = 50 pF

Unit

Symbol

Parameter

Min

Typ

Max

Min

Max

Unit

tPLH

Propagation Delay

2.0

6.0

2.0

6.5

tPHL

An to Bn or Bn to An

2.0

6.0

2.0

6.5

tPLH

Propagation Delay

4.5

11.5

4.5

tPHL

An to PARITY

4.5

11.5

4.5

tPLH

Propagation Delay

2.0

7.5

2.0

8.5

tPHL

EVEN/ODD to PARITY, ERROR

2.0

7.5

2.0

8.5

tPLH

Propagation Delay

4.0

3.5

tPHL

Bn to ERROR

4.0

3.5

tPLH

Propagation Delay

5.0

4.0

tPHL

PARITY to ERROR

5.0

4.0

tPZH

Output Enable Time

2.0

7.0

2.0

8.0

tPZL

to HIGH or LOW Level

2.0

7.0

2.0

8.0

tPHZ

tPLZ

Output Disable Time

2.0

6.0

2.0

6.5

PHZ

tPLZ

from HIGH or LOW Level

2.0

6.0

2.0

6.5

4-408

FAST AND LS TTL DATA

Case 751E-03 DW Suffix

24-Pin Plastic

SO-24 (WIDE)

MIN

MAX

MILLIMETERS

INCHES

DIM

15.25

7.40

2.35

0.35

0.41

0.229

0.127

10.05

0.25

15.54

7.60

2.65

0.49

0.90

0.317

0.292

10.55

0.75

0.601

0.292

0.093

0.014

0.016

0.0090

0.0050

0.395

0.010

0.612

0.299

0.104

0.019

0.035

0.0125

0.0115

0.415

0.029

1.27 BSC

0.050 BSC

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A AND B DO NOT INCLUDE MOLD

PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)

PER SIDE.

5. 751E 01 AND 02 OBSOLETE, NEW STANDARD

751E 03.

-A-

-B-

-T-

24 PL

SEATING

PLANE

R X 45

12 PL

0.25 (0.010)

T B

Case 758-01 J Suffix

24-Pin Ceramic Dual In-Line

MIN

MAX

MILLIMETERS

INCHES

DIM

31.50

7.24

3.68

0.38

1.14

0.20

2.54

7.62

0.51

9.14

32.64

7.75

4.44

0.53

1.57

0.33

4.19

7.87

1.27

10.16

1.240

0.285

0.145

0.015

0.045

0.008

0.100

0.300

0.020

0.360

1.285

0.305

0.175

0.021

0.062

0.013

0.165

0.310

0.050

0.400

2.54 BSC

0.100 BSC

NOTES:

1. DIMENSION L TO CENTER OF LEADS WHEN

FORMED PARALLEL.

2. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5, 1973.

20 PL

INSIDE OF LEADS

-T-

SEATING

PLANE

-A-

T A

0.25 (0.010)

Case 724-03 N Suffix

24-Pin Plastic

MIN

MAX

MILLIMETERS

INCHES

DIM

31.25

6.35

3.69

0.38

1.02

0.18

2.80

0.51

1.01

0.020

0.040

32.13

6.85

4.44

0.51

1.52

0.30

3.55

1.230

0.250

0.145

0.015

0.040

0.007

0.110

1.265

0.270

0.175

0.020

0.060

0.012

0.140

1.27 BSC

2.54 BSC

7.62 BSC

0.050 BSC

0.100 BSC

0.300 BSC

NOTES:

1. CHAMFERRED CONTOUR OPTIONAL.

2. DIM L" TO CENTER OF LEADS WHEN FORMED

PARALLEL.

3. DIMENSIONS AND TOLERANCES PER ANSI

Y14.5M, 1982.

4. CONTROLLING DIMENSION: INCH.

-A-

-B-

-T-

SEATING

PLANE

24 PL

NOTE 1

T A

0.25 (0.010)

T B

0.25 (0.010)

4-409

FAST AND LS TTL DATA

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