National Semiconductor MM54HC242, MM74HC242, MM54HC243, MM74HC243 Service Manual

January 1988

MM54HC242/MM74HC242
Inverting Quad TRI-STATE

Transceiver

É

MM54HC243/MM74HC243 Quad TRI-STATE Transceiver

General Description

These TRI-STATE bidirectional inverting and non-inverting
buffers utilize advanced silicon-gate CMOS technology and
are intended for two-way asynchronous communication be­tween data buses. They have high drive current outputs
which enable high speed operation when driving large bus
capacitances. These circuits possess the low power dissi­pation and high noise immunity associated with CMOS cir­cuits, but speeds comparable to low power Schottky TTL
circuits. They can also drive 15 LS-TTL loads.

The MM54HC243/MM74HC243 is a non-inverting buffer
and the MM54HC242/MM74HC242 is an inverting buffer.
Each device has one active high enable (GBA), and one
active low enable (G

AB). GBA enables the A outputs and

Connection Diagrams

G

AB enables the B outputs. This device does not have

Schmitt trigger inputs.

All inputs are protected from damage due to static dis­charge by diodes to V

and ground.

CC

Features

Y

Typical propagation delay: 12 ns

Y

TRI-STATE outputs

Y

Two way asynchronous communication

Y

High output current: 6 mA (74HC)

Y

Wide power supply range: 2– 6V

Y

Low quiescent supply current: 80 mA (74HC)

MM54HC242/MM74HC242 Inverting Quad TRI-STATE Transceiver

MM54HC243/MM74HC243 Quad TRI-STATE Transceiver

Dual-In-Line Package

Top View

Order Number MM54HC242 or MM74HC242

Truth Tables

’HC242

Control Inputs Data Port Status

GAB GBA A B

H H OUTPUT Input
L H Isolated Isolated
H L Isolated Isolated
L L Input OUTPUT

TL/L/5019– 1

Dual-In-Line Package

TL/L/5019– 2

Top View

Order Number MM54HC243 or MM74HC243

’HC243

Control Inputs Data Port Status

GAB GBA A B

H H OUTPUT Input
L H Isolated Isolated
H L Isolated Isolated
L L Input OUTPUT

TRI-STATEÉis a registered trademark of National Semiconductor Corp.

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

TL/L/5019

Absolute Maximum Ratings (Notes1&2)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage (V

CC

)

DC Input Voltage (VIN)

DC Output Voltage (V

OUT

)

Clamp Diode Current (IIK,IOK)

DC Output Current, per pin (I

OUT

)

DC VCCor GND Current, per pin (ICC)

Storage Temperature Range (T

STG

b

b

)

b

0.5 toa7.0V

1.5 to V

CC

0.5 to V

CC

g

g

b

g

65§Ctoa150§C

a

1.5V

a

0.5V

20 mA

35 mA

70 mA

Operating Conditions

Supply Voltage (V
DC Input or Output Voltage 0 V

(V

IN,VOUT

Operating Temp. Range (T

MM74HC
MM54HC

Input Rise or Fall Times

)26V

CC

)

e

2.0V(tr,tf) 1000 ns

V

CC

e

4.5V 500 ns

V

CC

e

6.0V 400 ns

V

CC

Power Dissipation (PD)

(Note 3) 600 mW
S.O. Package only 500 mW

Lead Temp. (T

) (Soldering 10 seconds) 260§C

L

DC Electrical Characteristics (Note 4)

e

T

25§C

Symbol Parameter Conditions V

CC

A

Typ Guaranteed Limits

V

Minimum High Level 2.0V 1.5 1.5 1.5 V

IH

Input Voltage 4.5V 3.15 3.15 3.15 V

6.0V 4.2 4.2 4.2 V

V

Maximum Low Level 2.0V 0.5 0.5 0.5 V

IL

Input Voltage** 4.5V 1.35 1.35 1.35 V

6.0V 1.8 1.8 1.8 V

V

Minimum High Level V

OH

Output Voltage

e

VIHor V

l

I

OUT

IN

IL

s

20 mA 2.0V 2.0 1.9 1.9 1.9 V

l

4.5V 4.5 4.4 4.4 4.4 V

6.0V 6.0 5.9 5.9 5.9 V

e

V

VIHor V

IN

I

l

OUT

I

l

OUT

l

I

OUT

e

IN

V

Maximum Low Level V

OL

Output Voltage

IL

s

6.0 mA 4.5V 4.2 3.98 3.84 3.7 V

l

s

7.8 mA 6.0V 5.7 5.48 5.34 5.2 V

l

VIHor V

IL

s

20 mA 2.0V 0 0.1 0.1 0.1 V

l

4.5V 0 0.1 0.1 0.1 V

6.0V 0 0.1 0.1 0.1 V

e

V

VIHor V

IN

I

l

OUT

I

l

OUT

I

IN

I

OZ

I

CC

Maximum Input V
Current

Maximum TRI-STATE V
Output Leakage Current GABeVIH, GBAeV

Maximum Quiescent V
Supply Current I

Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur.

Note 2: Unless otherwise specified all voltages are referenced to ground.

Note 3: Power Dissipation temperature derating Ð plastic ‘‘N’’ package:

Note 4: For a power supply of 5V

designing with this supply. Worst case V

, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used.

I

CC

**V

limits are currently tested at 20% of VCC. The above VILspecification (30% of VCC) will be implemented no later than Q1, CY’89.

IL

g

e

IN

OUT

e

IN

OUT

10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when

and VILoccur at V

IH

IL

s

6.0 mA 4.5V 0.2 0.26 0.33 0.4 V

l

s

7.8 mA 6.0V 0.2 0.26 0.33 0.4 V

l

VCCor GND 6.0V

e

VCCor GND 6.0V

IL

g

0.1

g

0.5

VCCor GND 6.0V 8.0 80 160 mA

e

0 mA

b

12 mW/§C from 65§Cto85§C; ceramic ‘‘J’’ package:b12 mW/§C from 100§Cto125§C.

e

5.5V and 4.5V respectively. (The VIHvalue at 5.5V is 3.85V.) The worst case leakage current (IIN,

CC

74HC 54HC

eb

T

40 to 85§CT

A

g

1.0

g

5.0

Min Max Units

)

A

b
b

40
55

eb

A

a

a

55 to 125§C

g

1.0 mA

g

10 mA

CC

85

125

V

C

§

C

§

Units

2

AC Electrical Characteristics (MM54HC242/MM74HC242)

e

e

e

5V, T

V

CC

A

25§C, t

e

t

6ns

r

f

Symbol Parameter Conditions Typ Guaranteed Limit Units

t

PHL,tPLH

t

PZH,tPZL

t

PHZ,tPHL

Maximum Propagation Delay C

Maximum Output Enable R
Time to Active Output C

Maximum Output Disable R
Time from Active Output C

e

45 pF 12 18 ns

L

e

1kX 17 28 ns

L

e

45 pF

L

e

1kX 15 25 ns

L

e

5pF

L

AC Electrical Characteristics (MM54HC242/MM74HC242, MM54HC243/MM74HC243)

e

2.0V to 6.0V, C

V

CC

Symbol Parameter Conditions V

t

PHL,tPLH

t

PZH,tPZL

t

PHZ,tPLZ

t

TLH,tTHL

Maximum Propagation C
Delay C

Maximum Output Enable R
Time to Active Output C

Maximum Output Disable R
Time from Active Output C

Maximum Output 2.0V 60 75 90 ns
Rise and Fall 4.5V 12 15 18 ns
Time 6.0V 10 13 15 ns

C

PD

C

IN

C

OUT

Note 5: CPDdetermines the no load dynamic power consumption, P

Power Dissipation (per buffer)
Capacitance (Note 5) Outputs Disabled 12 pF

Maximum Input Capacitance 5 10 10 10 pF

Maximum Output Capacitance 10 20 20 20 pF

e

L

50 pF, t

e

e

t

6 ns (unless otherwise specified)

r

f

e

T

25§C

A

CC

Typ Guaranteed Limits

e

50 pF 2.0V 55 100 126 149 ns

L

e

150 pF 2.0V 80 150 190 224 ns

L

e

C

50 pF 4.5V 12 20 25 30 ns

L

e

C

150 pF 4.5V 22 30 38 45 ns

L

e

C

50 pF 6.0V 11 17 21 25 ns

L

e

C

150 pF 6.0V 18 26 32 38 ns

L

e

1kX

L

e

50 pF 2.0V 75 150 189 224 ns

L

e

C

150 pF 2.0V 100 200 252 298 ns

L

e

C

50 pF 4.5V 15 30 38 45 ns

L

e

C

150 pF 4.5V 30 40 50 60 ns

L

e

C

50 pF 6.0V 13 26 32 38 ns

L

e

C

150 pF 6.0V 17 34 43 51 ns

L

e

1kX 2.0V 75 150 189 224 ns

L

e

50 pF 4.5V 15 30 38 45 ns

L

6.0V 13 26 32 38 ns

74HC 54HC

eb

T

40 to 85§CT

A

A

eb

Outputs Enabled 50 pF

2

e

CPDV

D

faICCVCC, and the no load dynamic current consumption, I

CC

55 to 125§C

e

S

Units

CPDVCCfaICC.

3

Logic Diagrams

MM54HC242/MM74HC242

MM54HC243/MM74HC243

TL/L/5019– 3

TL/L/5019– 4

4

5

Physical Dimensions inches (millimeters)

Order Number MM54HC242J, MM54HC243J, MM74HC242J or MM74HC243J

Cavity Dual-In Line Package (J)

NS Package Number J14A

MM54HC243/MM74HC243 Quad TRI-STATE Transceiver

MM54HC242/MM74HC242 Inverting Quad TRI-STATE Transceiver

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.

Molded Dual-In Line Package (N)

Order Number MM74HC242N or MM74HC243N

NS Package Number N14A

National Semiconductor National Semiconductor National Semiconductor National Semiconductor
Corporation Europe Hong Kong Ltd. Japan Ltd.

1111 West Bardin Road Fax: (
Arlington, TX 76017 Email: [e-mail] Ocean Centre, 5 Canton Rd. Fax: [phone]
Tel: [phone] Deutsch Tel: (
Fax: [phone] English Tel: (

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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a

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