CD74HCT242 Datasheet, PDF (1/7 Pages) Texas Instruments – High Speed CMOS Logic Quad-Bus Transceiver with Three-State Outputs

CD74HCT242 was not acquired from Harris Semiconductor.
CD74HCT242, CD74HC243,
CD74HCT243
Data sheet acquired from Harris Semiconductor
SCHS168
High Speed CMOS Logic
November 1997
Quad-Bus Transceiver with Three-State Outputs
[ /Title
(CD74
HCT24
2,
CD74
HC243
,
CD74
HCT24
3)
/Sub-
ject
(High
Speed
CMOS
Logic
Quad-
Features
Description
• Typical Propagation Delay (A to B, B to A) of 7ns at
V_CC = 5V, C_L = 15pF, T_A = 25^oC
• Three-State Outputs
• Buffered Inputs
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC
at V_CC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V_IL= 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l ≤ 1µA at V_OL, V_OH
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
comparable to low power Schottky TTL circuits. They can
drive 15 LSTTL loads.
The CD74HCT242 is an inverting buffer; the CD74HC243
and CD74HCT243 are non-inverting buffers.
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.
Ordering Information
TEMP. RANGE
PART NUMBER
(^oC)
PACKAGE
CD74HC243E
-55 to 125 14 Ld PDIP
CD74HC243M
-55 to 125 14 Ld SOIC
PKG.
NO.
E14.3
M14.15
Pinout
CD74HCT242, CD74HC243, CD74HCT243
(PDIP, SOIC)
TOP VIEW
OEB 1
NC 2
A0 3
14 V_CC
13 OEA
12 NC
CD74HCT243M
-55 to 125 14 Ld SOIC
M14.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer or die for this part number is available which meets all elec-
trical specifications. Please contact your local sales
A1 4
11 B0
A2 5
A3 6
10 B1
9 B2
GND 7
8 B3
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1997
1
File Number 1488.1