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

April 1988
Revised April 1999

74F245 Octal Bidirectional Transceiver with 3-STATE Outputs

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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

A

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)

B

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

OE

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

CC

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

CC

= 0V)

Standard Output −0.5V to V

CC

3-STATE Output −0.5V to +5.5V

Current Applied to Output

in LOW State (Max) twice the r ated I

OL

(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

V

CC

Conditions

V

IH

Input HIGH Voltage 2.0 V Recognized as a HIGH Signal

V

IL

Input LOW Voltage 0.8 V Recognized as a LOW Signal

V

CD

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

V

OH

Output HIGH Voltage 10% V

CC

2.4 V Min IOH = −3 mA (An)

10% V

CC

2.0 IOH = −15 mA (Bn)

5% V

CC

2.7 IOH = −3 mA (An)

V

OL

Output LOW Voltage 10% V

CC

0.5 V Min IOL = 24 mA (An)

10% V

CC

0.55 IOL = 64 mA (Bn)

I

IH

Input HIGH Current 5.0 µAMaxVIN = 2.7V

I

BVI

Input HIGH Current Breakdown Test 7.0

µAMax

VIN = 7.0V (OE, T/R)

I

BVIT

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

I

CEX

Output HIGH Leakage Current 50 µAMaxV

OUT

= VCC (An, Bn)

V

ID

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

I

OD

Output Leakage 3.75 µA0.0V

IOD

= 150 mV

Circuit Current All Other Pins Grounded

I

IL

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)

I

OS

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

OUT

= 0V (An)

−100 −225 V

OUT

= 0V (Bn)

I

ZZ

Bus Drainage Test 500 µA0.0VV

OUT

= 5.25V(An, Bn)

I

CCH

Power Supply Current 70 90 mA Max VO = HIGH

I

CCL

Power Supply Current 95 120 mA Max VO = LOW

I

CCZ

Power Supply Current 85 110 mA Max VO = HIGH Z