CDx4HC243, CDx4HCT243 High-Speed CMOS Logic Quad-Bus Transceiver with

Three-State Outputs

1 Features

• Typical propagation delay (A to B, B to A) of 7ns at

VCC = 5 V, CL = 15pF, TA = 25oC

• Three-state outputs

• Buffered inputs

• Fanout (over temperature range)

– Standard outputs : 10 LSTTL loads

– Bus driver outputs : 15 LSTTL loads

• Wide operating temperature range : -55oC to

125oC

• Balanced propagation delay and transition times

• Significant power reduction compared to LSTTL

logic ICs

• HC types

– 2 V to 6 V Operation

– High noise immunity: NIL = 30%, NIH = 30% of

VCC at VCC = 5V

• HCT types

– 4.5 V to 5.5 V operation

– Direct LSTTL input logic compatibility, VIL= 0.8

V (Max), VIH = 2 V (Min)

– CMOS input compatibility, Il ≤ 1µA at VOL, VOH

2 Description

The CDx4HC243 and CDx4HCT243 are quad bus

transceivers with 3-state outputs. The OEA and OEB

inputs control both the high-impedance state as well

as the direction of communication through the device.

Device Information

PART NUMBER

PACKAGE

(1)

BODY SIZE (NOM)

CD54HC243F

CDIP (14)

19.55 mm × 6.71 mm

CD74HC243E

PDIP (14)

19.31 mm × 6.35 mm

CD74HC243M

SOIC (14)

8.65 mm × 3.90 mm

CD74HCT243E

PDIP (14)

19.31 mm × 6.35 mm

CD74HCT243M

SOIC (14)

8.65 mm × 3.90 mm

(1)

For all packages see the orderable addendum at the end of

the datasheet.

Ax

Bx

OEB

OEA

1 of 4 Channels

Functional Block Diagram

CD54HC243, CD74HC243, CD54HCT243, CD74HCT243

SCHS168E – NOVEMBER 1998 – REVISED MARCH 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.