Fairchild Semiconductor 74F243SCX, 74F243SC Datasheet

74F243
Quad Bus Tr ansceiver with 3-STAT E Outputs

74F243 Quad Bus Transceiver with 3-STATE Outputs

April 1988
Revised July 1999

General Description

The 74F243 is a quad bus transmitter/receiver designed for
4-line asynchronous 2-wa y data communica tions between
data busses.

Features

■ 2-Way asynchronous data bus communication

■ Input cl amp diodes limit high-speed term ination effects

Ordering Code:

Order Code Package Number Package Description

74F243SC M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow

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 Symbol

IEEE/IEC

Connection Diagram

Truth Table

Inputs Inputs/Outputs

E

L L Input B = A
LHN/AN/A
HLZZ

H = HIGH Voltage Level Z = High Impedance
L = LOW Voltage Level N/A = Not Allowed

HHA = B Input

1

E

2

A

n

B

n

Unit Loading/Fan Out

Pin

Names

E

1

E

2

, BnInputs 3.5/2.67 70 µA/−1.6 mA

A

n

© 1999 Fairchild Semiconductor Corporation DS009502 www.fairchildsemi.com

Description

Enable Input (Active LOW) 1.0/1.67 20 µA/−1 mA
Enable Input (Active HIGH) 1.0/1.67 20 µA/−1 mA

Outputs 600/106.6

U.L.

HIGH/LOW

(80)

Input I

IH/IIL

Output IOH/I

−12 mA/64 mA
(48 mA)

OL

Absolute Maximum Ratings(Note 1) Recommended Operating

Storage Temperature −65°C to +150°C

74F243

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

Pin Potential to Ground Pin −0.5V to +7.0V

V

CC

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
3-STATE Output −0.5V to +5.5V

Current Applied to Output

in LOW State (Max) twice the rated I

ESD Last Passing Voltage (Min) 4000V

OL

Conditions

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

Note 1: Absolute maximum ratings are values beyond which the device

CC

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

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

(mA)

DC Electrical Characteristics

Symbol Parameter Min Typ Max Units

V

IH

V

IL

V

CD

V

OH

V

OL

I

IH

I

BVI

I

BVIT

I

CEX

V

ID

I

OD

I

IL

IIH + I
IIL + I
I

OS

I

CCH

I

CCL

I

CCZ

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 10% V
Voltage 10% V

5% V
Output LOW 10% V
Voltage
Input HIGH
Current

Input HIGH Current
Breakdown Test
Input HIGH Current
Breakdown (I/O)
Output HIGH
Leakage Current
Input Leakage
Test All Other Pins Grounded
Output Leakage
Circuit Current All Other Pins Grounded

2.4

CC

2.0 IOH = −15 mA (An, Bn)

CC

2.7 IOH = −3 mA (An, Bn)

CC
CC

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

5.0 µAMaxVIN = 2.7V

7.0 µAMaxVIN = 7.0V (E1, E2)

0.5 mA Max VIN = 5.5V (An, Bn)

50 µAMaxV

4.75 V 0.0

3.75 µA0.0

Input LOW Current −1.0 mA Max VIN = 0.5V (E1, E2)
Output Leakage Current 70 µAMaxV

OZH

Output Leakage Current −1.6 mA Max V

OZL

Output Short-Circuit Current −100 −225 mA Max V
Power Supply Current 64 80 mA Max VO = HIGH
Power Supply Current 64 90 mA Max VO = LOW
Power Supply Current 71 90 mA Max VO = HIGH Z

V

CC

IOH = −3 mA (An, Bn)

VMin

IID = 1.9 µA

V

Conditions

= V

OUT

CC

= 150 mV

IOD

= 2.7V (An, Bn)

OUT

= 0.5V (An, Bn)

OUT

= 0V (An, Bn)

OUT

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