Datasheet 74FR245SJX, 74FR245SJ, 74FR245SCX, 74FR245SC, 74FR245PC Datasheet (Fairchild Semiconductor)

© 1999 Fairchild Semiconductor Corporation DS010887 www.fairchildsemi.com

August 1990
Revised August 1999

74FR245 Octal Bidirectional Transceiver with 3-STATE Outputs

74FR245
Octal Bidirectional Transceiver with 3-STATE Outputs

General Description

The 74FR245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bu s-ori­ented applications. Current sinking capability is 64 mA on
both the A and B Ports. The Transmit/Receive (T /R

) input
determines the directio n of data flow through the b idirec­tional transceiver. Transmit (active-HIGH) enables data
from A Ports to B Ports; Receive (active-LOW) enables
data from B Ports to A Ports. The Output Enable input,
when HIGH, disables both A and B P orts by placi ng them
in a High Z condition.

Features

■ Non-inverting buffers

■ Bidirectional data path

■ A and B output sink capability of 64 mA, source

capability of 15 mA

■ Guarante ed pin-to-pin skew

Ordering Code:

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

Logic Symbol

Pin Descriptions

Connection Diagram

Truth Table

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

Order Number Package Number Package Description

74FR245SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74FR245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74FR245PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Pin Names Description

OE

Output Enable Input (Active-LOW)

T/R

Transmit/Receive Input

A

0–A7

Side A Inputs or 3-STATE Outputs

B

0–B7

Side B Inputs or 3-STATE Outputs

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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74FR245

Logic Diagram

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74FR245

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 rated 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 HIGH Signal

V

IL

Input LOW Voltage 0.8 V Recognized LOW Signal

V

CD

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

V

OH

Output HIGH Voltage 2.4 V Min IOH = −3 mA (An, Bn)

2.0 V Min IOH = −15 mA (An, Bn)

V

OL

Output LOW Voltage 0.55 V Min IOL = 64 mA (An, Bn)

I

IH

Input HIGH Current 5 µAMax

VIN = 2.7V (OE, T/R)

I

BVI

Input HIGH Current

7 µAMaxVIN = 7.0V (OE, T/R)

Breakdown Test

I

BVIT

Input HIGH Current

100 µAMaxVIN = 5.5V (An, Bn)

Breakdown Test (I/O)

I

IL

Input LOW Current −250 µAMax

VIN = 0.5V (OE, T/R)

V

ID

Input Leakage Test 4.75 V 0.0 IID = 1.9 µA

All Other Pins Grounded

I

OD

Output Circuit

3.75 µA0.0

V

IOD

= 150 mV

Leakage Current All Other Pins Grounded

IIH + I

OZH

Output Leakage Current 25 µAMaxV

OUT

= 2.7V (An, Bn)

IIL + I

OZL

Output Leakage Current −150 µAMaxV

OUT

= 0.5V (An, Bn)

I

OS

Output Short-Circuit Current −100 −225 mA Max V

OUT

= 0.0V (An, Bn)

I

CEX

Output HIGH Leakage Current 50 µAMaxV

OUT

= VCC (An, Bn)

I

ZZ

Bus Drainage Test 100 µA0.0V

OUT

= 5.25V (An, Bn)

I

CCH

Power Supply Current 55 75 mA Max All Outputs HIGH

I

CCL

Power Supply Current 75 110 mA Max All Outputs LOW

I

CCZ

Power Supply Current 55 75 mA Max Outputs 3-STATE

C

IN

Input Capacitance 8.0 pF 5.0

OE, T/R

17.0 pF 5.0 An, B

n

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74FR245

AC Electrical Characteristics

Extended AC Characteristics

Note 3: This spec ification is gu arante ed but not te sted. T he lim its app ly to propag ation d elays for a ll path s desc ribed switchin g in phase, i.e. , all LOW-to-

HIGH, HIGH-to-LOW, 3-STATE-to-HIGH, etc.
Note 4: These specific ations guarant eed but no t tested. The limits repres ent propaga tion delays wi th 250 pF l oad capacitors in place of the 50 pF load

capacitors in the standard AC load. This s pecification pertains to s ingle output switching only.
Note 5: Skew is defined as the absolute value of t he difference betw een the actual p ropagation delays f or any two outp ut s of the same device. T he specifi-

cation applies to any outputs switching HIGH-to-LOW (t

OSHL

), LOW-to-HIGH (t

OSLH

), or HIGH-to-L OW an d/or LOW -to-H IG H (t

OST

). Specifications guara n-

teed with all outputs switching in phase.

Symbol Parameter

TA = +25°CT

A

= 0°C to +70°C

Units

VCC = +5.0V VCC = +5.0V

CL = 50 pF CL = 50 pF

Min Typ Max Min Max

t

PLH

Propagation Delay 1.0 2.6 3.9 1.0 3.9

ns

t

PHL

An to Bn or Bn to A

n

1.0 1.7 3.9 1.0 3.9

t

PZH

Output Enable Time 2.5 5.0 7.0 2.5 7.0

ns

t

PZL

2.5 4.3 7.0 2.5 7.0

t

PHZ

Output Disable Time 1.7 3.7 6.5 1.7 6.5

ns

t

PLZ

1.7 3.6 6.5 1.7 6.5

Symbol Parameter TA = 0°C to +70°CT

A

= 0°C to +70°CUnits

VCC = +5.0V VCC = +5.0V

CL = 50 pF CL = 250 pF

Eight Outputs Switching (Note 4)

(Note 3)

Min Max Min Max

t

PLH

Propagation Delay 1.0 5.9 2.5 7.5

ns

t

PHL

An to Bn or Bn to A

n

1.05.92.57.5

t

PZH

Output Enable Time 2.5 11.9

ns

t

PZL

2.5 11.9

t

PHZ

Output Disable Time 1.3 6.5

ns

t

PLZ

1.3 6.5

t

OSHL

Pin to Pin Skew

1.7 ns

(Note 5) for HL Transitions
t

OSLH

Pin to Pin Skew

1.0 ns

(Note 5) for LH Transitions
t

OST

Pin to Pin Skew

3.3 ns

(Note 5) for HL/LH Transitions

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74FR245

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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74FR245 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 pate nt licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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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 syste ms
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 i n any compon ent of a lif e support
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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