74VHC244MTC - National Semiconductor

TL/F/11522

74VHC244 #74VHCT244 Octal Buffer/Line Driver with TRI-STATE Outputs

October 1995

74VHC244 #74VHCT244

Octal Buffer/Line Driver with TRI-STATEÉOutputs

General Description

The ’VHC/’VHCT244 is an advanced high speed CMOS oc-

tal bus buffer fabricated with silicon gate C2MOS technolo-

gy. It achieves high speed operation similar to equivalent

Bipolar Schottky TTL while maintaining the CMOS low pow-

er dissipation. The ’VHC/’VHCT244 is a non-inverting

TRI-STATE buffer having two active-low output enables.

These devices are designed to be used as TRI-STATE

memory address drivers, clock drivers, and bus oriented

transmitter/receivers.

An input protection circuit ensures that 0V–7V can be ap-

plied to the input pins without regard to the supply voltage.

This device can be used to interface 5V to 3V systems and

two supply systems such as battery back up. This circuit

prevents device destruction due to mismatched supply and

input voltages.

Features

YHigh noise immunity:

VHC VNIH eVNIL e28% VCC (min)

VHCT VIH e2.0V, VIL e0.8V

YPower down protection:

VHC inputs only

VHCT inputs and outputs

YLow noise:

VHC VOLP e0.6V (typ)

VHCT VOLP e0.7V (typ)

YLow power dissipation:

ICC e4mA (max) @TAe25§C

YBalanced propagation delays: tPLH jtPHL

YPin and function compatible with 74HC/HCT244

NOTE: ADD EXTERNAL PULL UP RESISTOR TO VHCT OUTPUTS TO

DRIVE CMOS INPUTS

Commercial Package Number Package Description

74VHC244M M20B 20-Lead Molded JEDEC SOIC

74VHC244SJ M20D 20-Lead Molded EIAJ SOIC

74VHC244MSC MSC20 20-Lead Molded EIAJ Type 1 SSOP

74VHC244MTC MTC20 20-Lead Molded JEDEC Type 1 TSSOP

74VHC244N N20A 20-Lead Molded DIP

74VHCT244M M20B 20-Lead Molded JEDEC SOIC

74VHCT244SJ M20D 20-Lead Molded EIAJ SOIC

74VHCT244MTC MTC20 20-Lead Molded JEDEC Type 1 TSSOP

74VHCT244N N20A 20-Lead Molded DIP

Note: Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter ‘‘X’’ to the ordering code.

EIAJ Type 1 SSOP available on Tape and Reel only, order MSCX.

Logic Symbol

IEEE/IEC

TL/F/11522–3

Connection Diagram

Pin Assignment for DIP,

SSOP, TSSOP and SOIC

TL/F/11522– 1

Truth Tables

Inputs Outputs

OE1In(Pins 12, 14, 16, 18)

LL L

LH H

HX Z

Inputs Outputs

OE2In(Pins 3, 5, 7, 9)

LL L

LH H

HX Z

HIGH Voltage Level I eImmaterial

LeLOW Voltage Level ZeHigh

Impedance

Pin Names Description

OE1,OE

2TRI-STATE Output Enable Inputs

I0–I7Inputs

O0–O7TRI-STATE Outputs

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

C1995 National Semiconductor Corporation RRD-B30M125/Printed in U. S. A.

Absolute Maximum Ratings (Note 1)

Supply Voltage (VCC)b0.5V to a7.0V

DC Input Voltage (VIN)b0.5V to a7.0V

DC Output Voltage (VOUT)

VHC b0.5V to VCC a0.5V

VHCT*b0.5V to 7.0V

Input Diode Current (IIK)b20 mA

Output Diode Current (IOK)

VHC g20 mA

VHCT b20 mA

DC Output Current (IOUT)g25 mA

DC VCC/GND Current (ICC)g75 mA

Storage Temperature (TSTG)b65§Ctoa

150§C

Lead Temperature (TL)

(Soldering, 10 seconds) 260§C

*VOUT lVCC only if output is in H or Z state.

Note 1:

Absolute Maximum Ratings are values beyond

which the device may be damaged or have its useful life

impaired. The databook specifications should be met, with-

out exception, to ensure that the system design is reliable

over its power supply, temperature, and output/input load-

ing variables. National does not recommend operation out-

side databook specifications.

Recommended Operating

Conditions

Supply Voltage (VCC)

VHC 2.0V to 5.5V

VHCT 4.5V to 5.5V

Input Voltage (VIN)0Vto

5.5V

Output Voltage (VOUT) 0VtoV

Operating Temperature (TOPR)

74VHC/VHCT b40§Ctoa

85§C

Input Rise and Fall Time (tr,t

)

CC e3.3V g0.3V (VHC Only) 0 ns/V E100 ns/V

VCC e5.0V g0.5V 0 ns/V E20 ns/V

DC Characteristics for ’VHC Family Devices

Symbol Parameter VCC

(V)

74VHC 74VHC

Units Conditions

TAe25§CTAeb

40§C

to a85§C

Min Typ Max Min Max

VIH High Level Input Voltage 2.0 1.5 1.5

3.0–5.5 0.7 VCC 0.7 VCC V

VIL Low Level Input Voltage 2.0 0.5 0.5

3.0–5.5 0.3 VCC 0.3 VCC V

VOH High Level Output Voltage 2.0 1.9 2.0 1.9 VIN eVIH IOH eb

50 mA

3.0 2.9 3.0 2.9 V or VIL

4.5 4.4 4.5 4.4

3.0 2.58 2.48 VIOH eb

4mA

4.5 3.94 3.80 IOH eb

8mA

OL Low Level Output Voltage 2.0 0.0 0.1 0.1 VIN eVIH IOL e50 mA

3.0 0.0 0.1 0.1 V or VIL

4.5 0.0 0.1 0.1

3.0 0.36 0.44 VIOL e4mA

4.5 0.36 0.44 IOL e8mA

DC Characteristics for ’VHC Family Devices (Continued)

74VHC 74VHC

Symbol Parameter VCC TAe25§CTAeb

40§CUnits Conditions

(V) to a85§C

Min Typ Max Min Max

IOZ TRI-STATE Output Off-State Current 5.5 g0.25 g2.5 mAVIN eVIH or VIL

VOUT eVCC or GND

IIN Input Leakage Current 0–5.5 g0.1 g1.0 mAV

IN e5.5V or GND

ICC Quiescent Supply Current 5.5 4.0 40.0 mAV

IN eVCC or GND

DC Characteristics for ’VHC Family Devices

VCC

(V)

74VHC

Symbol Parameter TAe25§C Units Conditions

Typ Limits

VOLP** Quiet Output Maximum 5.0 0.6 0.9 V CLe50 pF

Dynamic VOL

VOLV** Quiet Output Minimum 5.0 b0.6 b0.9 V CLe50 pF

Dynamic VOL

VIHD** Minimum High Level 5.0 3.5 V CLe50 pF

Dynamic Input Voltage

VILD** Maximum High Level 5.0 1.5 V CLe50 pF

Dynamic Input Voltage

**Parameter guaranteed by design.

DC Characteristics for ’VHCT Family Devices

Symbol Parameter VCC

(V)

74VHC 74VHC

Units Conditions

TAe25§CTAeb

40§C

to a85§C

Min Typ Max Min Max

VIH High Level Input 4.5 2.0 2.0 V

Voltage 5.5 2.0 2.0

VIL Low Level Input

5.5

4.5

0.8

0.8 V

Voltage

VOH High Level 4.5 3.15 3.65 3.15 VVIN eVIH IOH eb

50 mA

Output Voltage 4.5 2.5 2.4 or VIL IOH eb

8mA

OL Low Level 4.5 0.0 0.1 0.1 VVIN eVIH IOL e50 mA

Output Voltage 4.5 0.36 0.44 or VIL IOL e8mA

OZ TRI-STATE VIN eVIH or VIL

Output 5.5 g0.25 g2.5 mAVOUT eVCC or GND

Off-State

Current

IIN Input VIN e5.5V or GND

Leakage 0–5.5 g0.1 g1.0 mA

Current

ICC Quiescent VIN eVCC or GND

Supply 5.5 4.0 40.0 mA

Current

ICCT Maximum 5.5 1.35 1.50 mA VIN e3.4V, Other

ICC/Input Inputs eVCC or GND

IOPD Output VOUT e5.5V

Leakage 0.0 a0.5 a5.0 mA

(Power Down

State)

DC Characteristics for ’VHCT Family Devices:

Symbol Parameter VCC

(V)

74VHCT

Units Conditions

TAe25§C

Typ Limits

VOLP** Quiet Output Maximum 0.7 1.0 V CLe50 pF

Dynamic VOL

VOLV** Quiet Output Minimum b0.7 b1.0 V CLe50 pF

Dynamic VOL

VIHD** Minimum High Level 2.0 V CLe50 pF

Dynamic Input Voltage

VILD** Maximum High Level 0.8 V CLe50 pF

Dynamic Input Voltage

**Parameter guaranteed by design.

AC Electrical Characteristics for ’VHC Family Devices:

Symbol Parameter VCC

(V)

74VHC 74VHC

Units Conditions

TAe25§CTAeb

40§C

to a85§C

Min Typ Max Min Max

tPLH, Propagation Delay Time 3.3 g0.3 5.8 8.4 1.0 10.0 ns CLe15 pF

tPHL 8.3 11.9 1.0 13.5 CLe50 pF

5.0 g0.5 3.9 5.5 1.0 6.5 ns CLe15 pF

5.4 7.5 1.0 8.5 CLe50 pF

tPZL, TRI-STATE Output Enable 3.3 g0.3 6.6 10.6 1.0 12.5 ns RLe1kXC

Le15 pF

TimetPZH 9.1 14.1 1.0 16.0 CLe50 pF

5.0 g0.5 4.7 7.3 1.0 8.5 ns CLe15 pF

6.2 9.3 1.0 10.5 CLe50 pF

tPLZ, TRI-STATE 3.3 g0.3 10.3 14.0 1.0 16.0

RLe1kXC

Le50 pF

tPHZ Output

5.0 g0.5 6.7 9.2 1.0 10.5 CLe50 pF

Disable Time

tOSLH, Output to Output Skew 3.3 g0.3 1.5 1.5 ns (Note 1) CLe50 pF

tOSHL 5.0 g0.5 1.0 1.0 CLe50 pF

CIN Input Capacitance 4 10 10 pF VCC eOpen

COUT Output Capacitance 6 pF VCC e5.0V

CPD Power Dissipation Capacitance 19 pF (Note 2)

Note 1: Parameter guaranteed by design. tOSLH e

tPLHmax btPLHmin

OSHL e

tPHLmax btPHLmin

Note 2: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average

operating current can be obtained by the equation: ICC (OPR.) eCPD *VCC *fIN aICC/8 (per bit).

AC Electrical Characteristics for ’VHCT Family Devices

Symbol Parameter VCC

(V)

74VHCT 74VHCT

Units Conditions

TAe25§CTAeb

40§C

to a85§C

Min Typ Max Min Max

tPLH, Propagation Delay Time 5.0 g0.5 5.4 7.4 1.0 8.5 ns CLe15 pF

tPHL 5.9 8.4 1.0 9.5 CLe50 pF

tPZL, TRI-STATE Output Enable Time 5.0 g0.5 7.7 10.4 1.0 12.0

RLe1kXC

Le15 pF

tPZH 8.2 11.4 1.0 13.0 CLe50 pF

tPLZ, TRI-STATE 5.0 g0.5 RLe1kXC

Le50 pF

tPHZ Output 8.8 11.4 1.0 13.0 ns

Disable Time

tOSLH, Output to Output Skew 5.0 g0.5 1.0 1.0 ns (Note 1) CLe50 pF

tOSHL

CIN Input Capacitance 4 10 10 pF VCC eOpen

COUT Output Capacitance 9 pF VCC e5.0V

CPD Power Dissipation Capacitance 18 pF (Note 2)

Note 1: Parameter guaranteed by design. tOSLH e

tPLHmax btPLHmin

OSHL e

tPHLmax btPHLmin

Note 2: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average

operating current can be obtained by the equation: ICC (OPR.) eCPD *VCC *fIN aICC/8 (per bit).

Ordering Information

The device number is used to form part of a simplified purchasing code, where the package type and temperature range are

defined as follows:

TL/F/11522– 4

Physical Dimensions inches (millimeters)

20-Lead Small Outline Integrated Circuit JEDEC SOIC (M)

Order Number 74VHC244M, 74VHC244MX, 74VHCT244M or 74VHCT244MX

NS Package Number M20B

20-Lead Small Outline Integrated Circuit-EIAJ SOIC (SJ)

Order Number 74VHC244SJ, 74VHC244SJX, 74VHCT244SJ or 74VHCT244SJX

NS Package Number M20D

Physical Dimensions millimeters

20-Lead Plastic EIAJ SSOP Type I (MSC)

Order Number 74VHC244MSCX

NS Package Number MSC20

20-Lead Plastic JEDEC TSSOP Type I (MTC)

Order Number 74VHC244MTC, 74VHC244MTCX, 74VHCT244MTC or 74VHCT244MTCX

NS Package Number MTC20

74VHC244 #74VHCT244 Octal Buffer/Line Driver with TRI-STATE Outputs

Physical Dimensions (millimeters) (Continued)

20-Lead Molded DIP

Order Number 74VHC244N or 74VHCT244N

NS Package Number N20A

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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.

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