74VHC245MSC - National Semiconductor

TL/F/11520

74VHC245 #74VHCT245

Octal Bidirectional Transceiver with TRI-STATE Outputs

October 1995

74VHC245 #74VHCT245

Octal Bidirectional Transceiver with TRI-STATEÉOutputs

General Description

The VHC/VHCT245 is an advanced high speed CMOS octal

bus transceiver fabricated with silicon gate CMOS technolo-

gy. It achieves high speed operation similar to equivalent

Bipolar Schottky TTL while maintaining the CMOS low pow-

er dissipation. The ’VHC245 is intended for bidirectional

asynchronous communication between data busses. The di-

rection of data transmission is determined by the level of the

T/R input. The enable input can be used to disable the de-

vice so that the busses are effectively isolated. All inputs

are equipped with protection circuits against static dis-

charge.

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 e0.9V (typ)

VHCT VOLP e1.1V (typ)

YLow Power Dissipation:

ICC e4mA (Max) @Tae25§C

YBalanced Propagation Delays: tpLH jtpHL

YPin and Function Compatible with 74HC/HCT245

Commercial Package Package Description

Number

74VHC245M M20B 20 Lead Molded JEDEC SOIC

74VHC245SJ M20D 20 Lead Molded EIAJ SOIC

74VHC245MSC MSC20 20 Lead Molded EIAJ Type 1 SSOP

74VHC245MTC MTC20 20 Lead Molded JEDEC Type 1 TSSOP

74VHC245N N20A 20 Lead Molded DIP

74VHCT245M M20B 20 Lead Molded JEDEC SOIC

74VHCT245SJ M20D 20 Lead Molded EIAJ SOIC

74VHCT245MTC MTC20 20 Lead Molded JEDEC Type 1 TSSOP

74VHCT245N 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 Connection Diagram

IEEE/IEC

TL/F/11520–2

Pin Assignment for DIP,

SSOP, TSSOP and SOIC

TL/F/11520–3

Pin Description

Names

OE Output Enable Input

T/R Transmit/Receive Input

A0–A7Side A Inputs or

TRI-STATE Outputs

B0–B7Side B Inputs or

TRI-STATE Outputs

Truth Table

Inputs Outputs

OE T/R

L L Bus B Data to Bus A

L H Bus A Data to Bus B

H X HIGH-Z State

HeHIGH Voltage Level X eImmaterial

LeLOW Voltage Level

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) (T/R,OE) b

0.5V to 7.0V

DC Output Voltage (VOUT)

VHC b0.5V to VCC a0.5V

VHCT*b0.5V to 7.0V

Input Diode Current (IIK) (T/R,OE) b

20 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)(T/R,OE) 0V to 5.5V

Output Voltage (VOUT) 0VtoV

Operating Temperature (TOPR)

74 VHC/VHCT b40§Ctoa

85§C

Input Rise and Fall Time (tr,t

)

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

VCC e5.0V g0.5V 0 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 1.50 1.50 V

3.0– 5.5 0.7 VCC 0.7 VCC

VIL Low Level Input Voltage 2.0 0.50 0.50 V

3.0– 5.5 0.3 VCC 0.3 VCC

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

50 mA

Voltage 3.0 2.9 3.0 2.9 V or VIL

4.5 4.4 4.5 4.4

4.5 2.58 2.48 VIOH eb

4mA

4.5 3.94 3.80 IOH eb

8mA

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

Voltage 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

OZ TRI-STATE Output Off- VIN eVCC or GND

State Current 5.5 g0.25 g2.5 mAV

OUT eVCC or GND

VIN OE eVIH or VIL

IIN Input Leakage Current 0– 5.5 g0.1 g1.0 mAVIN e5.5V or GND

(T/R,OE)

CC Quiescent Supply 5.5 4.0 40.0 mAVIN eVCC or GND

Current

DC Characteristics for ’VHC Family Devices:

74VHC

Symbol Parameter VCC TAe25§C Units Conditions

(V)

Typ Limits

*VOLP Quiet Output Maximum 5.0 0.9 1.2 V CLe50 pF

Dynamic VOL

*VOLV Quiet Output Minimum 5.0 b0.9 b1.2 V CLe50 pF

Dynamic VOL

*VIHD Minimum High Level 5.0 3.5 V CLe50 pF

Dynamic Input Voltage

*VILD Maximum Low Level 5.0 1.5 V CLe50 pF

Dynamic Input Voltage

*Parameter guaranteed by design.

DC Characteristics for ’VHCT Family Devices

74VHCT 74VHCT

Symbol Parameter VCC TAe25§CTAeb

40§CUnits Conditions

(V) to a85§C

Min Typ Max Min Max

VIH High Level 4.5 2.0 2.0 V

Input Voltage 5.5 2.0 2.0

VIL Low Level 4.5 0.8 0.8 V

Input Voltage 5.5 0.8 0.8

VOH High Level 4.5 3.15 3.65 3.15 V VIN eVIH IOH eb

50 mA

Output Voltage or VIL

4.5 2.5 2.4 V IOH eb

8mA

OL Low Level 4.5 0.0 0.1 0.1 V VIN eVIH IOL e50 mA

Output Voltage or VIL

4.5 0.36 0.44 V IOL e8mA

OZ TRI-STATE Output VIN eVCC or GND

Off-State Current 5.5 g0.25 g2.5 mAV

OUT eVCC or GND

VIN OE eVIH or VIL

IIN Input Leakage 0–5.5 g0.1 g1.0 mAVIN e5.5V or GND

(T/R,OE) Current

ICC Quiescent Supply 5.5 4.0 40.0 mAVIN eVCC or GND

Current

ICCT Maximum ICC/Input VIN e3.4V

5.5 1.35 1.50 mA Other Inputs eVCC

or GND

IOPD Output Leakage

Current (Power 0.0 a0.5 a5.0 mAV

OUT e5.5V

Down State)

DC Characteristics for ’VHCT Family Devices:

74VHCT

Symbol Parameter VCC TAe25§C Units Conditions

(V)

Typ Limits

VOLP*Quiet Output Maximum 1.1 1.6 V CLe50 pF

Dynamic VOL

VOLV*Quiet Output Minimum b1.1 b1.6 V CLe50 pF

Dynamic VOL

VIHD*Minimum High Level 2.0 VCLe50 pF

Dynamic Input Voltage

VILD*Maximum Low Level 0.8 V CLe50 pF

Dynamic Input Voltage

*Parameter guaranteed by design.

AC Electrical Characteristics for ’VHC Family Devices

74VHC 74VHC

Symbol Parameter VCC TAe25§CTAeb

40§CUnits Conditions

(V) 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 4.0 5.5 1.0 6.5 ns CLe15 pF

5.5 7.5 1.0 8.5 CLe50 pF

tPZL TRI-STATE Output Enable 3.3 g0.3 8.5 13.2 1.0 15.5 ns RLe1kXC

Le15 pF

TimetPZH 11.0 16.7 1.0 19.0 CLe50 pF

5.0 g0.5 5.8 8.5 1.0 10.0 ns CLe15 pF

7.3 10.6 1.0 12.0 CLe50 pF

tPLZ TRI-STATE Output 3.3 g0.3 11.5 15.8 1.0 18.0 ns RLe1kXC

Le50 pF

tPHZ Disable Time 5.0 g0.5 7.0 9.7 1.0 11.0 CLe50 pF

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 410 10 pF

CC eOpen

(T/R,OE)

I/O Output Capacitance 8 pF VCC e5.0V

CPD Power Dissipation

21 pF

(Note 2)

Capacitance

Note 1: Parameter guaranteed by design. tOSLH e

tPLH max btPLH min

OSHL e

tPHL max btPHL min

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

74VHCT 74VHCT

Symbol Parameter VCC TAe25§CTAeb

40§CUnits Conditions

(V) to a85§C

Min Typ Max Min Max

tPLH Propagation Delay Time 5.0 g0.5 4.5 7.7 1.0 8.5 ns CLe15 pF

tPHL 5.3 8.7 1.0 9.5 CLe50 pF

tPZL TRI-STATE Output Enable 5.0 g0.5 8.9 13.8 1.0 15.0 ns RLe1kXC

Le15 pF

TimetPZH 9.7 14.8 1.0 16.0 CLe50 pF

tPLZ TRI-STATE Output 5.0 g0.5 10.0 15.4 1.0 16.5 ns RLe1kXC

Le50 pF

tPHZ 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

CI/O Output Capacitance 9 pF VCC e5.0V

CPD Power Dissipation Capacitance 23 pF (Note 2)

Note 1: Parameter guaranteed by design. tOSLH e

tPLH max btPLH min

OSHL e

tPHL max btPHL min

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/11520–5

Physical Dimensions inches (millimeters)

20-Lead Small Outline Integrated CircuitÐJEDEC SOIC (M)

Order Number 74VHC245M, 74VHC245MX, 74VHCT245M, or 74VHCT245MX

NS Package Number M20B

20-Lead Small Outline Package EIAJ SOIC (SJ)

Order Number 74VHC245SJ, 74VHC245SJX, 74VHCT245SJ, or 74VHCT245SJX

NS Package Number M20D

Physical Dimensions millimeters (Continued)

20-Lead Plastic EIAJ SSOP Type I (MSC)

Order Number 74VHC245MSCX

NS Package Number MSC20

Physical Dimensions millimeters (Continued)

20-Lead Plastic JEDEC TSSOP Type I (MTC)

Order Number 74VHC245MTC, 74VHC245MTCX, 74VHCT245MTC or 74VHCT245MTCX

NS Package Number MTC20

74VHC245 #74VHCT245

Octal Bidirectional Transceiver with TRI-STATE Outputs

Physical Dimensions inches (millimeters) (Continued)

20-Lead (0.300×Wide) Molded Dual-In-Line Package

Order Number 74VHCT245N

NS Package Number N20A

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be reasonably expected to result in a significant injury

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