TI CD74HCT242

[ /Title
(CD74
HCT24
2,
CD74
HC243
,
CD74
HCT24
3)
/Subject
(High
Speed
CMOS
Logic
Quad-
CD74HCT242 was not acquired from Harris Semiconductor.
CD74HCT242, CD74HC243,
CD74HCT243
Data sheet acquired from Harris Semiconductor
SCHS168
November 1997
High Speed CMOS Logic
Quad-Bus Transceiver with Three-State Outputs
Features
Description
• Typical Propagation Delay (A to B, B to A) of 7ns at
VCC = 5V, CL = 15pF, TA = 25oC
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.
• 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
The CD74HCT242 is an inverting buffer; the CD74HC243
and CD74HCT243 are non-inverting buffers.
• Balanced Propagation Delay and Transition Times
• 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
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
Ordering Information
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
PART NUMBER
Pinout
TEMP. RANGE
(oC)
PKG.
NO.
PACKAGE
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:
CD74HCT242, CD74HC243, CD74HCT243
(PDIP, SOIC)
TOP VIEW
OEB 1
14 VCC
NC 2
13 OEA
A0 3
12 NC
A1 4
11 B0
A2 5
10 B1
A3 6
9 B2
GND 7
8 B3
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 electrical specifications. Please contact your local sales
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
1
File Number
1488.1
CD74HCT242, CD74HC243, CD74HCT243
Functional Diagrams
CD74HCT242
A0
A1
CD74HC243, CD74HC243
3
11
4
10
5
9
A2
6
A0
B1
A1
B2
A2
B3
A3
8
A3
1
OEB
13
OEA
B0
3
11
4
10
5
9
B1
B2
6
OEB
DIRECTION
SELECT LOGIC
OEA
B0
8
B3
1
13
DIRECTION
SELECT LOGIC
TRUTH TABLE
CONTROL INPUTS
HCT242 SERIES
HC, HCT243 SERIES
DATA PORT STATUS
DATA PORT STATUS
OEB
OEA
An
Bn
An
Bn
H
H
O
I
O
I
L
H
Z
Z
Z
Z
H
L
Z
Z
Z
Z
L
L
I
O
I
O
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 prevent excess 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, IIK
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, IOK
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±20mA
DC Drain Current, per Output, IO
For -0.5V < VO < VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . . . . . .±35mA
DC Output Source or Sink Current per Output Pin, IO
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA
DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .±70mA
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)
Operating Conditions
Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Supply Voltage Range, VCC
HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V
HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC
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.
DC Electrical Specifications
TEST
CONDITIONS
PARAMETER
SYMBOL
VI (V)
VIH
-
25oC
IO (mA) VCC (V)
-40oC TO 85oC
-55oC TO 125oC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNITS
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
-0.02
2
1.9
-
-
1.9
-
1.9
-
V
-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
0.02
2
-
-
0.1
-
0.1
-
0.1
V
0.02
4.5
-
-
0.1
-
0.1
-
0.1
V
0.02
6
-
-
0.1
-
0.1
-
0.1
V
6
4.5
-
-
0.26
-
0.33
-
0.4
V
7.8
6
-
-
0.26
-
0.33
-
0.4
V
HC TYPES
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
CMOS Loads
VIL
VOH
-
VIH or
VIL
High Level Output
Voltage
TTL Loads
Low Level Output
Voltage
CMOS Loads
Low Level Output
Voltage
TTL Loads
VOL
VIH or
VIL
-
-
3
CD74HCT242, CD74HC243, CD74HCT243
DC Electrical Specifications
(Continued)
TEST
CONDITIONS
PARAMETER
SYMBOL
VI (V)
II
VCC or
GND
-
Quiescent Device
Current
ICC
VCC or
GND
Three-State Leakage
Current
IOZ
High Level Input
Voltage
25oC
IO (mA) VCC (V)
-40oC TO 85oC
-55oC TO 125oC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNITS
6
-
-
±0.1
-
±1
-
±1
µA
0
6
-
-
8
-
80
-
160
µA
VIL or
VIH
-
6
-
-
±0.5
-
±0.5
-
±10
µA
VIH
-
-
4.5 to
5.5
2
-
-
2
-
2
-
V
Low Level Input
Voltage
VIL
-
-
4.5 to
5.5
-
-
0.8
-
0.8
-
0.8
V
High Level Output
Voltage
CMOS Loads
VOH
VIH or
VIL
-0.02
4.5
4.4
-
-
4.4
-
4.4
-
V
-6
4.5
3.98
-
-
3.84
-
3.7
-
V
0.02
4.5
-
-
0.1
-
0.1
-
0.1
V
6
4.5
-
-
0.26
-
0.33
-
0.4
V
Input Leakage
Current
HCT TYPES
High Level Output
Voltage
TTL Loads
Low Level Output
Voltage
CMOS Loads
VOL
VIH or
VIL
Low Level Output
Voltage
TTL Loads
II
VCC to
GND
0
5.5
-
-
±0.1
-
±1
-
±1
µA
ICC
VCC or
GND
0
5.5
-
-
8
-
80
-
160
µA
Additional Quiescent
Device Current Per
Input Pin: 1 Unit Load
(Note 4)
∆ICC
VCC
-2.1
-
4.5 to
5.5
-
100
360
-
450
-
490
µA
Three-State Leakage
Current
IOZ
VIL or
VIH
-
5.5
-
-
±0.5
-
±5.0
-
±10
µA
Input Leakage
Current
Quiescent Device
Current
NOTE:
4. For dual-supply systems theoretical worst case (VI = 2.4V, VCC = 5.5V) specification is 1.8mA.
HCT Input Loading Table
INPUT
UNIT LOADS
An, Bn
1.1
OEA, OEB
0.6
NOTE: Unit Load is ∆ICC limit specified in DC Electrical
Specifications table, e.g., 360µA max at 25oC.
4
CD74HCT242, CD74HC243, CD74HCT243
Switching Specifications
PARAMETER
HC TYPES
Propagation Delay Data
to Outputs (HC243)
Output High-Z, to High Level
to Low Level
Output High Level,
Output Low Level to High-Z
Output Transition Times
Input tr, tf = 6ns
SYMBOL
TEST
CONDITIONS
tPLH, tPHL
CL = 50pF
tPZL, tPZH
tPHZ, tPLZ
tTLH, tTHL
25oC
VCC (V)
TYP
-40oC TO 85oC -55oC TO 125oC
MAX
MAX
MAX
UNITS
2
-
90
115
135
ns
4.5
-
18
23
27
ns
CL = 15pF
5
7
-
-
-
ns
CL = 50pF
6
-
15
20
23
ns
CL = 50pF
2
-
150
190
225
ns
CL = 50pF
4.5
-
30
38
45
ns
CL = 15pF
5
12
-
-
-
ns
CL = 50pF
6
-
26
33
38
ns
CL = 50pF
2
-
150
190
225
ns
CL = 50pF
4.5
-
30
38
45
ns
CL = 15pF
5
12
-
-
-
ns
CL = 50pF
6
-
26
33
38
ns
CL = 50pF
2
-
60
75
90
ns
4.5
-
12
15
18
ns
6
-
10
13
15
ns
Input Capacitance
CI
-
-
-
10
10
10
pF
Three-State Output
Capacitance
CO
-
-
-
20
20
20
pF
Power Dissipation
Capacitance (HC243)
(Notes 5, 6)
CPD
-
5
80
-
-
-
pF
4.5
-
20
25
30
ns
CL = 15pF
5
8
-
-
-
ns
CL = 50pF
4.5
-
22
28
33
ns
CL = 15pF
5
9
-
-
-
ns
CL = 50pF
4.5
-
34
43
51
ns
CL = 15pF
5
14
-
-
-
ns
CL = 50pF
4.5
-
35
44
53
ns
CL = 15pF
5
14
-
-
-
ns
CL = 50pF
4.5
-
12
15
18
ns
HCT TYPES
Propagation Delay Data to
Outputs (HCT242)
tPLH, tPHL
Propagation Delay Data to
Outputs (HCT243)
tPLH, tPHL
Output High-Z to High Level
to Low Level
tPZH, tPZL
Output High Level,
Output Low Level to High-Z
tPHZ, tPLZ
Output Transition Times
tTLH, tTHL
CL = 50pF
Input Capacitance
CI
-
-
-
10
10
10
pF
Three-State Output
Capacitance
CO
-
-
-
20
20
20
pF
Power Dissipation
Capacitance
(Notes 5, 6)
CPD
HCT242
5
90
-
-
-
pF
HCT243
5
91
-
-
-
pF
NOTES:
5. CPD is used to determine the dynamic power consumption, per channel.
6. PD = VCC2 fi (CPD + CL) where fi = Input Frequency, fO = Output Frequency, CL = Output Load Capacitance, VCC = Supply Voltage.
5
CD74HCT242, CD74HC243, CD74HCT243
Test Circuits and Waveforms
tr = 6ns
tf = 6ns
90%
50%
10%
INPUT
GND
tTLH
tPHL
6ns
10%
2.7
1.3
OUTPUT LOW
TO OFF
90%
OUTPUT HIGH
TO OFF
50%
OUTPUTS
DISABLED
FIGURE 3. HC THREE-STATE PROPAGATION DELAY
WAVEFORM
OTHER
INPUTS
TIED HIGH
OR LOW
OUTPUT
DISABLE
IC WITH
THREESTATE
OUTPUT
GND
1.3V
tPZH
90%
OUTPUTS
ENABLED
OUTPUTS
ENABLED
0.3
10%
tPHZ
tPZH
3V
tPZL
tPLZ
50%
OUTPUTS
ENABLED
6ns
GND
10%
tPHZ
tf
OUTPUT
DISABLE
tPZL
tPLZ
OUTPUT HIGH
TO OFF
6ns
tr
VCC
90%
tPLH
FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
6ns
OUTPUT LOW
TO OFF
1.3V
10%
INVERTING
OUTPUT
FIGURE 1. HC AND HCT TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC
50%
tTLH
90%
tPLH
tPHL
GND
tTHL
90%
50%
10%
INVERTING
OUTPUT
3V
2.7V
1.3V
0.3V
INPUT
tTHL
OUTPUT
DISABLE
tf = 6ns
tr = 6ns
VCC
1.3V
OUTPUTS
DISABLED
OUTPUTS
ENABLED
FIGURE 4. HCT THREE-STATE PROPAGATION DELAY
WAVEFORM
OUTPUT
RL = 1kΩ
CL
50pF
VCC FOR tPLZ AND tPZL
GND FOR tPHZ AND tPZH
NOTE: Open drain waveforms tPLZ and tPZL are the same as those for three-state shown on the left. The test circuit is Output RL = 1kΩ to
VCC, CL = 50pF.
FIGURE 5. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT
6
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