Texas Instruments CD74HCT243M, CD74HCT243E, CD74HC243M96, CD54HCT243F3A, CD54HC243F3A Datasheet
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CD74HCT242 was not acquired from Harris Semiconductor.
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Data sheet acquired from Harris Semiconductor
SCHS168
November 1997
Quad-Bus Transceiver with Three-State Outputs
CD74HCT242, CD74HC243,
CD74HCT243
High Speed CMOS Logic
[ /Title
(CD74
HCT24
2,
CD74
HC243
,
CD74
HCT24
3)
Subect
(High
Speed
CMOS
Logic
Quad-
Features
• Typical Propagation Delay (A to B, B to A) of 7ns at
V
= 5V, CL = 15pF, TA = 25oC
CC
• Three-State Outputs
• Buffered Inputs
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
o
• Wide Operating Temperature Range . . . -55
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
= 0.8V (Max), VIH = 2V (Min)
IL
- CMOS Input Compatibility, I
= 30%, NIH = 30% of V
IL
≤ 1µA at VOL, V
l
C to 125oC
OH
Pinout
CD74HCT242, CD74HC243, CD74HCT243
(PDIP, SOIC)
TOP VIEW
OEB
NC
A0
A1
A2
A3
GND
1
2
3
4
5
6
7
V
14
CC
OEA
13
NC
12
B0
11
B1
10
B2
9
B3
8
Description
The Harris CD74HCT242, CD74HC243 and CD74HCT243
silicon-gate CMOS three-state bidirectional inverting and
non-inverting buffers are intended for two-wayasynchronous
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 (
both the direction of flow (A to B, B to A), and the three-state
mode.
CC
OEB, OEA) determine
Ordering Information
TEMP. RANGE
PART NUMBER
CD74HC243E -55 to 125 14 Ld PDIP E14.3
CD74HC243M -55 to 125 14 Ld SOIC M14.15
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 diefor this partnumber is availablewhich meets allelectrical specifications. Please contact your local sales
(oC) PACKAGE
PKG.
NO.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
1
File Number 1488.1
Functional Diagrams
CD74HCT242 CD74HC243, CD74HC243
CD74HCT242, CD74HC243, CD74HCT243
3
A0
4
A1
5
A2
6
A3
1
OEB
13
OEA
CONTROL INPUTS
DIRECTION
SELECT LOGIC
11
B0
10
B1
9
B2
8
B3
A0
A1
A2
A3
OEB
OEA
3
4
5
6
1
13
DIRECTION
SELECT LOGIC
TRUTH TABLE
HCT242 SERIES HC, HCT243 SERIES
DATA PORT STATUS DATA PORT STATUS
11
B0
10
B1
9
B2
8
B3
OEB OEA An Bn An Bn
HHOIOI
LHZZZZ
HLZZZZ
LLIOIO
NOTE:
H = High Voltage Level
L = Low Voltage Level
I = Input
O = Output (Same Level as Input)
O = Output (Inversion of Input Level)
Z = High Impedance
To prev ent e xcess currents in the High Z modes all I/O terminals should be terminated with 10kΩ to 1MΩ resistors.
2
CD74HCT242, CD74HC243, CD74HCT243
Absolute Maximum Ratings Thermal Information
DC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
DC Input Diode Current, I
IK
For VI < -0.5V or VI > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, I
OK
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±20mA
DC Drain Current, per Output, I
O
For -0.5V < VO < VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . . . . . .±35mA
DC Output Source or Sink Current per Output Pin, I
O
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA
DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .±70mA
Operating Conditions
Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Supply Voltage Range, V
HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V
HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to V
Input Rise and Fall Time
2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max)
4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max)
6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (Max)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
3. θJA is measured with the component mounted on an evaluation PC board in free air.
CC
Thermal Resistance (Typical, Note 3) θJA (oC/W)
PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . . .150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . .300oC
(SOIC - Lead Tips Only)
CC
DC Electrical Specifications
PARAMETER SYMBOL
HC TYPES
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
CMOS Loads
High Level Output
Voltage
TTL Loads
Low Level Output
Voltage
CMOS Loads
V
IH
V
IL
V
OH
V
OL
TEST
CONDITIONS
25oC -40oC TO 85oC -55oC TO 125oC
VCC (V)
- - 2 1.5 - - 1.5 - 1.5 - V
4.5 3.15 - - 3.15 - 3.15 - V
6 4.2 - - 4.2 - 4.2 - V
- - 2 - - 0.5 - 0.5 - 0.5 V
4.5 - - 1.35 - 1.35 - 1.35 V
6 - - 1.8 - 1.8 - 1.8 V
VIH or
V
-0.02 2 1.9 - - 1.9 - 1.9 - V
IL
-0.02 4.5 4.4 - - 4.4 - 4.4 - V
-0.02 6 5.9 - - 5.9 - 5.9 - V
-6 4.5 3.98 - - 3.84 - 3.7 - V
-7.8 6 5.48 - - 5.34 - 5.2 - V
VIH or
V
0.02 2 - - 0.1 - 0.1 - 0.1 V
IL
0.02 4.5 - - 0.1 - 0.1 - 0.1 V
0.02 6 - - 0.1 - 0.1 - 0.1 V
UNITSVI(V) IO(mA) MIN TYP MAX MIN MAX MIN MAX
Low Level Output
Voltage
TTL Loads
6 4.5 - - 0.26 - 0.33 - 0.4 V
7.8 6 - - 0.26 - 0.33 - 0.4 V
3
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