Datasheet

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November 1992

Revised April 2005

74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs

74VHC245

Octal Bidirectional Transceiver with 3-STATE Outputs

General Description

The VHC245 is an advanced high speed CMOS octal bus

transceiver fabricated with silicon gate CMOS technology.

It achieves high speed operation similar to equivalent Bipo-

lar Schottky TTL while maintaining the CMOS low power

dissipation. The VHC245 is intended for bidirectional asyn-

chronous communication between data busses. The direc-

tion of data transmission is determined by the level of the

T/R

input. The enable input can be used to disable the

device so that the busses are effectively isolated. All inputs

are equipped with protection circuits against static dis-

charge.

Features

■ High Speed: t

4.0 ns (typ) at V

■ High Noise Immunity: V

NIH

NIL

28% V

(Min)

■ Power Down Protection is provided on all inputs

■ Low Noise: V

OLP

0.9V (typ)

■ Low Power Dissipation:

4 A (Max) @ T

25 C

■ Pin and Function Compatible with 74HC245

Ordering Code:

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Pb-Free package per JEDEC J-STD-020B.

Logic Symbol

IEEE/IEC

Pin Description

Connection Diagram

Truth Table

H HIGH Voltage Level L LOW Voltage Level X Immaterial

Any unused bus terminals during HIGH-Z State must be held HIGH or

LOW.

Order Number Package Number Package Description

74VHC245M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

74VHC245SJ M20D Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74VHC245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74VHC245N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Pin Description

Names

Output Enable Input

T/R

Transmit/Receive Input

–A

Side A Inputs or 3-STATE Outputs

–B

Side B Inputs or 3-STATE Outputs

Inputs Outputs

T/R

L L Bus B Data to Bus A

L H Bus A Data to Bus B

H X HIGH-Z State

Summary of content (7 pages)

PAGE 1
Revised April 2005 74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs General Description Features The VHC245 is an advanced high speed CMOS octal bus transceiver fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The VHC245 is intended for bidirectional asynchronous communication between data busses.
PAGE 2
74VHC245 Absolute Maximum Ratings(Note 1) Recommended Operating Conditions (Note 2) 0.5V to 7.0V 0.5V to 7.0V 0.5V to VCC 0.5V 20 mA r20 mA r25 mA r75 mA 65qC to 150qC Supply Voltage (VCC) DC Input Voltage (VIN) (T/R, OE) DC Output Voltage (VOUT) Input Diode Current (IIK) (T/R, OE) Output Diode Current (IOK) DC Output Current (IOUT ) DC VCC/GND Current (ICC) Storage Temperature (TSTG) Supply Voltage (VCC) 0V to 5.
PAGE 3
74VHC245 Noise Characteristics Symbol VOLP Quiet Output Maximum (Note 3) Dynamic VOL VOLV Quiet Output Minimum (Note 3) VIHD (Note 3) VILD (Note 3) VCC Parameter TA 25qC Units Conditions (V) Typ Limits 5.0 0.9 1.2 V CL 50 pF 5.0 0.9 1.2 V CL 50 pF 5.0 3.5 V CL 50 pF 5.0 1.5 V CL 50 pF Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage Note 3: Parameter guaranteed by design.
PAGE 4
74VHC245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B www.fairchildsemi.
PAGE 5
74VHC245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 5 www.fairchildsemi.
PAGE 6
74VHC245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20 www.fairchildsemi.
PAGE 7
4VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N20A Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.