1
Data sheet acquired from Harris Semiconductor
SCHS189A
Features
• ’HC540, CD74HCT540 . . . . . . . . . . . . . . . . . . . Inverting
• ’HC541, ’HCT541. . . . . . . . . . . . . . . . . . . . . . .Non-In verting
• Buffered Inputs
• Three-State Outputs
• Bus Line Driving Capability
• Typical Propagation Delay = 9ns at VCC = 5V,
CL = 15pF, TA = 25oC
• Fanout (Over Temperature Range)
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating T emperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• 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
Description
The ’HC540 and CD74HCT540 are Inverting Octal Buffers
and Line Drivers with Three-State Outputs and the capability
to drive 15 LSTTL loads. The ’HC541 and ’HCT541 are Non-
Inverting Octal Buffers and Line Drivers with Three-State Out-
puts that can drive 15 LSTTL loads. The Output Enables
(OE1) and (OE2) control the Three-State Outputs. If either
OE1 or OE2 is HIGH the outputs will be in the high imped-
ance state. For data output OE1 and OE2 both must be LOW.
Ordering Information
PART NUMBER TEMP. RANGE
(oC) PACKAGE
CD54HC540F3A -55 to 125 20 Ld CERDIP
CD74HC540E -55 to 125 20 Ld PDIP
CD74HC540M -55 to 125 20 Ld SOIC
CD74HCT540E -55 to 125 20 Ld PDIP
CD74HCT540M -55 to 125 20 Ld SOIC
CD54HC541F3A -55 to 125 20 Ld CERDIP
CD74HC541E -55 to 125 20 Ld PDIP
CD74HC541M -55 to 125 20 Ld SOIC
CD54HCT541F -55 to 125 20 Ld CERDIP
CD54HCT541F3A -55 to 125 20 Ld CERDIP
CD74HCT541E -55 to 125 20 Ld PDIP
CD74HCT541M -55 to 125 20 Ld SOIC
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all
electrical specifications. Please contact your local TI sales office
or customer service for ordering information.
Pinouts
CD54HC540
(CERDIP)
CD74HC540, CD74HCT540
(PDIP, SOIC)
TOP VIEW
CD54HC541, CD54HCT541
(CERDIP)
CD74HC541, CD74HCT541
(PDIP, SOIC)
TOP VIEW
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
OE
A0
A1
A2
A3
A4
A6
A5
A7
GND
VCC
Y0
Y1
Y2
OE2
Y3
Y4
Y5
Y6
Y7 11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
OE1
A0
A1
A2
A3
A4
A6
A5
A7
GND
VCC
Y0
Y1
Y2
OE2
Y3
Y4
Y5
Y6
Y7
January 1998 - Revised May 2000
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2000, Texas Instruments Incorporated
CD54/74HC540, CD74HCT540,
CD54/74HC541, CD54/74HCT541
High Speed CMOS Logic
Octal Buffer and Line Drivers, Three-State
[ /Title
(CD74
HC540
,
CD74
HCT54
0,
CD74
HC541
,
CD74
HCT54
2
Functional Diagram
TRUTH TABLE
INPUTS OUTPUTS
OE1 OE2 An 540 541
LLHLH
HXXZZ
XHXZZ
LLLHL
NOTE:
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
D0Y0
D2
D4
D6
Y2
Y4
Y6
D1
D3
D5
D7
Y1
Y3
Y5
Y7
OEAOEB
540 541
Y0
Y2
Y4
Y6
Y1
Y3
Y5
Y7
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
3
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 . . . . . . . . . . . . . . . . . . . . . . . . .±50mA
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)
Thermal Resistance (Typical, Note 3) θJA (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
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
PARAMETER SYMBOL
TEST
CONDITIONS VCC
(V)
25oC -40oC TO 85oC -55oC TO 125oC
UNITSVI(V) IO(mA) MIN TYP MAX MIN MAX MIN MAX
HC TYPES
High Level Input
Voltage VIH - - 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
Low Level Input
Voltage VIL - - 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
High Level Output
Voltage
CMOS Loads
VOH VIH or VIL -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
High Level Output
Voltage
TTL Loads
- - ---- - - -V
-6 4.5 3.98 - - 3.84 - 3.7 - V
-7.8 6 5.48 - - 5.34 - 5.2 - V
Low Level Output
Voltage
CMOS Loads
VOL VIH or VIL 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
Low Level Output
Voltage
TTL Loads
- - ---- - - -V
6 4.5 - - 0.26 - 0.33 - 0.4 V
7.8 6 - - 0.26 - 0.33 - 0.4 V
Input Leakage
Current IIVCC or
GND -6--±0.1 - ±1-±1µA
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
4
Quiescent Device
Current ICC VCC or
GND 0 6 - - 8 - 80 - 160 µA
Three-State Leakage
Current IOZ VIL or VIH VO =
VCC or
GND
6--±0.5 - ±5.0 - ±10 µA
HCT TYPES
High Level Input
Voltage 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
High Level Output
Voltage
TTL Loads
-6 4.5 3.98 - - 3.84 - 3.7 - V
Low Level Output
Voltage
CMOS Loads
VOL VIH or VIL 0.02 4.5 - - 0.1 - 0.1 - 0.1 V
Low Level Output
Voltage
TTL Loads
6 4.5 - - 0.26 - 0.33 - 0.4 V
Input Leakage
Current IIVCC and
GND 0 5.5 - ±0.1 - ±1-±1µA
Quiescent Device
Current ICC VCC or
GND 0 5.5 - - 8 - 80 - 160 µA
Three-State Leakage
Current IOZ VIL or VIH VO =
VCC or
GND
5.5 - - ±0.5 - ±5.0 - ±10 µA
Additional Quiescent
Device Current Per
Input Pin: 1 Unit Load
∆ICC VCC
-2.1 - 4.5 to
5.5 - 100 360 - 450 - 490 µA
NOTE: For dual-supply systems theoretical worst case (VI = 2.4V, VCC = 5.5V) specification is 1.8mA.
DC Electrical Specifications (Continued)
PARAMETER SYMBOL
TEST
CONDITIONS VCC
(V)
25oC -40oC TO 85oC -55oC TO 125oC
UNITSVI(V) IO(mA) MIN TYP MAX MIN MAX MIN MAX
HCT Input Loading Table
INPUT
UNIT LOADS
HCT540 HCT541
A0 - A7 1 0.4
OE2 0.75 0.75
OE1 1.15 1.15
NOTE: Unit load is ∆ICC limit specific in DC Electrical Specifications
Table, e.g., 360µA max. at 25oC.
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
5
Switching Specifications CL = 50pF, Input tr, tf= 6ns
PARAMETER SYMBOL TEST
CONDITIONS VCC (V)
25oC-40oC TO
85oC-55oC TO
125oC
UNITSMIN TYP MAX MIN MAX MIN MAX
HC TYPES
Propagation Delay tPLH, tPHL CL = 50pF
Data to Outputs (540) 2 - - 110 - 140 - 165 ns
4.5 - - 22 - 28 - 33 ns
CL = 15pF 5 - 9 - - - - - ns
CL = 50pF 6 - - 19 - 24 - 28 ns
Data to Outputs (541) tPLZ,t
PHZ CL = 50pF 2 - - 115 - 145 - 175 ns
4.5 - - 23 - 29 - 35 ns
CL = 15pF 5 - 9 - - - - - ns
CL = 50pF 6 - - 20 - 25 - 30 ns
Output Enable and Disable
to Outputs (540) tPLZ,t
PHZ CL = 50pF 2 - - 160 - 200 - 240 ns
4.5 - - 32 - 40 - 48 ns
CL = 15pF 5 - 13 - - - - - ns
CL = 50pF 6 - - 27 - 34 - 41 ns
Output Enable and Disable
to Outputs (541) tPLZ,t
PHZ CL = 50pF 2 - - 160 - 200 - 240 ns
4.5 - - 32 - 40 - 48 ns
CL = 15pF 5 - 14 - - - - - ns
CL = 50pF 6 - - 23 - 29 - 35 ns
Output Transition Time tTHL, tTLH CL = 50pF 2 - - 60 - 75 - 90 ns
4.5 - - 12 - 15 - 18 ns
6 - - 10 - 13 - 15 ns
Input Capacitance CICL = 50pF - 10 - 10 - 10 - 10 pF
Three-State Output
Capacitance CO- - 20 - 20 - 20 - 20 pF
Power Dissipation Capacitance
(Notes 4, 5) (540) CPD CL = 15pF 5 - 50 - - - - - pF
Power Dissipation Capacitance
(Notes 4, 5) (541) CPD CL = 15pF 5 - 48 - - - - - pF
HCT TYPES
Propagation Delay tPHL, tPLH
Data to Outputs (540) CL = 50pF 4.5 - - 24 - 30 - 36 ns
CL = 15pF 5 - 9 - - - - - ns
Data to Outputs (541) tPHL, tPLH CL = 50pF 4.5 - - 28 - 35 - 42 ns
CL = 15pF 5 - 11 - - - - - ns
Output Enable and Disable
to Outputs (540, 541) tPLZ,t
PHZ CL = 50pF 4.5 - - 35 - 44 - 53 ns
CL = 15pF 5 - 14 - - - - - ns
Output Transition Time tTLH, tTHL CL = 50pF 4.5 - - 12 - 15 - 18 ns
Input Capacitance CICL = 50pF - 10 - 10 - 10 - 10 pF
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
6
Three-State Output
Capacitance CO- - 20 - 20 - 20 - 20 pF
Power Dissipation Capacitance
(Notes 4, 5) (540, 541) CPD CL = 15pF 5 - 55 - - - - - pF
NOTES:
4. CPD is used to determine the dynamic power consumption, per channel.
5. PD = VCC2 fi (CPD + CL) where fi = Input Frequency, CL = Output Load Capacitance, VCC = Supply Voltage.
Switching Specifications CL = 50pF, Input tr, tf= 6ns (Continued)
PARAMETER SYMBOL TEST
CONDITIONS VCC (V)
25oC-40oC TO
85oC-55oC TO
125oC
UNITSMIN TYP MAX MIN MAX MIN MAX
Test Circuits and Waveforms
FIGURE 1. HC TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
FIGURE 3. HC THREE-STATE PROPAGATION DELAY
WAVEFORM FIGURE 4. HCT THREE-STATE PROPAGATION DELAY
WAVEFORM
tPHL tPLH
tTHL tTLH
90%
50%
10%
50%
10%
INVERTING
OUTPUT
INPUT
GND
VCC
tr = 6ns tf = 6ns
90%
tPHL tPLH
tTHL tTLH
2.7V
1.3V
0.3V
1.3V
10%
INVERTING
OUTPUT
INPUT
GND
3V
tr = 6ns tf = 6ns
90%
50% 10%
90%
GND
VCC
10%
90% 50%
50%
OUTPUT
DISABLE
OUTPUT LOW
TO OFF
OUTPUT HIGH
TO OFF
OUTPUTS
ENABLED OUTPUTS
DISABLED OUTPUTS
ENABLED
6ns 6ns
tPZH
tPHZ
tPZL
tPLZ
0.3
2.7
GND
3V
10%
90%
1.3V
1.3V
OUTPUT
DISABLE
OUTPUT LOW
TO OFF
OUTPUT HIGH
TO OFF
OUTPUTS
ENABLED OUTPUTS
DISABLED OUTPUTS
ENABLED
tr6ns
tPZH
tPHZ
tPZL
tPLZ
6ns tf
1.3
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
7
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=1kΩto
VCC, CL = 50pF. FIGURE 5. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT
Test Circuits and Waveforms
(Continued)
IC WITH
THREE-
STATE
OUTPUT
OTHER
INPUTS
TIED HIGH
OR LOW
OUTPUT
DISABLE
VCC FOR tPLZ AND tPZL
GND FOR tPHZ AND tPZH
OUTPUT
RL = 1kΩ
CL
50pF
CD54/74HC540, CD74HCT540, CD54/74HC541, CD54/74HCT541
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer’s applications, adequate design and operating
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Copyright 2000, Texas Instruments Incorporated
