CD74HCT242 was not acquired from Harris Semiconductor.
CD74HCT242, CD74HC243,
CD74HCT243
Data sheet acquired from Harris Semiconductor
SCHS168
High Speed CMOS Logic
Quad-Bus Transceiver with Three-State Outputs
November 1997
Features
Description
• Typical Propagation Delay (A to B, B to A) of 7ns at
The Harris CD74HCT242, CD74HC243 and CD74HCT243
silicon-gate CMOS three-state bidirectional inverting and
non-inverting buffers are intended for two-way asynchronous
communication between data buses. They have high drive
current outputs which enable high-speed operation when
driving large bus capacitances. These circuits possess the
low power dissipation of CMOS circuits, and have speeds
o
V
= 5V, C = 15pF, T = 25 C
CC
L A
[ /Title
(CD74
HCT24
2,
• Three-State Outputs
• Buffered Inputs
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
CD74
HC243
,
CD74
HCT24
3)
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads comparable to low power Schottky TTL circuits. They can
o
o
drive 15 LSTTL loads.
• Wide Operating Temperature Range . . . -55 C to 125 C
• Balanced Propagation Delay and Transition Times
The CD74HCT242 is an inverting buffer; the CD74HC243
and CD74HCT243 are non-inverting buffers.
• Significant Power Reduction Compared to LSTTL
Logic ICs
The states of the output enables (OEB, OEA) determine
both the direction of flow (A to B, B to A), and the three-state
mode.
• HC Types
- 2V to 6V Operation
/Sub-
ject
- High Noise Immunity: N = 30%, N = 30% of V
IL IH CC
at V
= 5V
Ordering Information
CC
(High
Speed
CMOS
Logic
Quad-
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
TEMP. RANGE
PKG.
NO.
o
PART NUMBER
CD74HC243E
CD74HC243M
CD74HCT243M
NOTES:
( C)
PACKAGE
14 Ld PDIP
14 Ld SOIC
14 Ld SOIC
V = 0.8V (Max), V = 2V (Min)
IL IH
-55 to 125
-55 to 125
-55 to 125
E14.3
- CMOS Input Compatibility, I ≤ 1µA at V , V
l
OL OH
M14.15
M14.15
Pinout
CD74HCT242, CD74HC243, CD74HCT243
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
(PDIP, SOIC)
TOP VIEW
2. Wafer or die for this part number is available which meets all elec-
trical specifications. Please contact your local sales
OEB
NC
A0
1
2
3
4
5
6
7
14 V
CC
13 OEA
12 NC
11 B0
A1
A2
10 B1
A3
9
8
B2
B3
GND
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
File Number 1488.1
Copyright © Harris Corporation 1997
1