Datasheet 74F245MTCX, 74F245MTC, 74F245MSAX, 74F245MSA, 74F245CW Datasheet (Fairchild Semiconductor)

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April 1988 Revised April 1999

74F245 Octal Bidirectional Transceiver with 3-STATE Outputs

General Description

The 74F245 contains ei ght non-in verting b idirection al buffers with 3-STATE outputs and is intended for bus-ori ented applications. Current sinking capability is 24 mA at the A Ports and 64 mA at the B Ports. The Transmit/Receive (T/R

) input determines the direction of data flow through the bidirectional transceiver. Transmit (active HIGH) enables data from A Ports to B Ports; Receive (active LOW) enables data from B Ports to A Ports. The Outp ut

Enable input, when HIGH, disa bles both A a nd B Por ts by placing them in a High Z condition.

Features

■ Non-inverting buffers

■ Bidirectional data path

■ A outputs sink 24 mA

■ B outputs sink 64 mA

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.

Logic Symbols

IEEE/IEC

Connection Diagram

Order Number Package Number Package Description

74F245SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 74F245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74F245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide 74F245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 74F245PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

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74F245

Unit Loading/Fan Out

Truth Table

H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial

Pin Names Description

U.L.

Input I

IH/IIL

HIGH/LOW

Output I

OH/IOL

OE Output Enable Input (Active LOW) 1.0/2.0 20 µA/−1.2 mA T/R

Transmit/Receive Input 1.0/2.0 20 µA/−1.2 mA

0–A7

Side A Inputs or 3.5/1.083 70 µA/−0.65 mA 3-STATE Outputs 150/40(38.3) −3 mA/24 mA (20 mA)

0–B7

Side B Inputs or 3.5/1.083 70 µA/−0.65 mA 3-STATE Outputs 600/106.6(80) −12 mA/64 mA (48 mA)

Inputs

Output

T/R

L L Bus B Data to Bus A L H Bus A Data to Bus B H X High Z State

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74F245

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

Note 1: Absolute maximum ratings are values beyon d which the device

may be damaged or have its useful life impaired . Functional operation under these condit ions is not implied.

Note 2: Either voltage limit or curren t limit is sufficient to protect in puts.

DC Electrical Characteristics

Storage Temperature −65°C to +150°C Ambient Temperature under Bias −55°C to +125°C Junction Temperature under Bias −55°C to +150°C V

Pin Potential to Ground Pin −0.5V to +7.0V Input Voltage (Note 2) −0.5V to +7.0V Input Current (Note 2) −30 mA to +5.0 mA Voltage Applied to Output

in HIGH State (with V

= 0V)

Standard Output −0.5V to V

3-STATE Output −0.5V to +5.5V

Current Applied to Output

in LOW State (Max) twice the r ated I

(mA)

ESD Last Passing Voltage (Min) 4000V

Free Air Ambi ent Temperature 0°C to +70°C Supply Voltage +4.5V to +5.5V

Symbol Parameter Min Typ Max Units

Conditions

Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

Input LOW Voltage 0.8 V Recognized as a LOW Signal

Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA

Output HIGH Voltage 10% V

2.4 V Min IOH = −3 mA (An)

10% V

2.0 IOH = −15 mA (Bn)

5% V

2.7 IOH = −3 mA (An)

Output LOW Voltage 10% V

0.5 V Min IOL = 24 mA (An)

10% V

0.55 IOL = 64 mA (Bn)

Input HIGH Current 5.0 µAMaxVIN = 2.7V

BVI

Input HIGH Current Breakdown Test 7.0

µAMax

VIN = 7.0V (OE, T/R)

BVIT

Input HIGH Current Breakdown (I/O) 0.5 mA Max VIN = 5.5 V (An, Bn)

CEX

Output HIGH Leakage Current 50 µAMaxV

OUT

= VCC (An, Bn)

Input Leakage 4.75 V 0.0 IID = 1.9 µA Test All Other Pins Grounded

Output Leakage 3.75 µA0.0V

IOD

= 150 mV

Circuit Current All Other Pins Grounded

Input LOW Current −1.2 mA Max

VIN = 0.5V (T/R, OE)

IIH + I

OZH

Output Leakage Current 70 µAMaxV

OUT

= 2.7V (An, Bn)

IIL + I

OZL

Output Leakage Current −650 µAMaxV

OUT

= 0.5V (An, Bn)

Output Short-Circuit Current −60 −150 mA Max V

OUT

= 0V (An)

−100 −225 V

OUT

= 0V (Bn)

Bus Drainage Test 500 µA0.0VV

OUT

= 5.25V(An, Bn)

CCH

Power Supply Current 70 90 mA Max VO = HIGH

CCL

Power Supply Current 95 120 mA Max VO = LOW

CCZ

Power Supply Current 85 110 mA Max VO = HIGH Z

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74F245

AC Electrical Characteristics

Symbol Parameter

TA = +25°CT

= − 55°C to +125°CTA = 0°C to +70°C

Units

VCC = +5.0V CL = 50 pF CL = 50 pF

CL = 50 pF

Min Typ Max Min Max Min Max

PLH

Propagation Delay 2.5 4.2 6.0 2.0 7.5 2.0 7.0 ns

PHL

An to Bn or Bn to A

2.54.26.02.07.52.07.0

PZH

Output Enable Time 3.0 5.3 7.0 2.5 9.0 2.5 8.0

PZL

3.5 6.0 8.0 3.0 10.0 3.0 9.0 ns

PHZ

Output Disable Time 2.0 5.0 6.5 2.0 9.0 2.0 7.5

PLZ

2.0 5.0 6.5 2.0 10.0 2.0 7.5

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74F245

Physical Dimensions inches (millimeters) unless otherwise noted

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

Package Number M20B

20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M20D

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74F245

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide

Package Number MSA20

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74F245

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

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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.

74F245 Octal Bidirectional Transceiver with 3-STATE Outputs

LIFE SUPPORT POLICY

FAIRCHILD’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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant inju ry to the user.

2. A critical component in any componen t of a life su pport device or system whose failu re to perform can be reasonably expected to ca use the fa i lure of the life su pp ort device or system, or to affect its safety or effectiveness.

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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