Page 1
M74HC540
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
■ HIGH SPEED:
t
= 9ns (TYP.) at VCC = 6V
PD
■ LOW POWER DISSIPATION:
I
= 4µA(MAX.) at TA=25°C
CC
■ HIGH NOISE IMMUNITY:
V
= V
NIH
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 6mA (MIN)
OH
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
■ WIDE OPERATING VOLTAGE RANGE:
V
(OPR) = 2V to 6V
CC
■ PIN AND FUNCTION COMPATIBLE WITH
= 28 % VCC (MIN.)
NIL
PHL
74 SERIES 540
DESCRIPTION
The 74HC540 is an advanced high-speed CMOS
OCTAL BUS BUFFER (3-ST ATE) fabricated with
silicon C
2
MOS technology. The M74HC541 i s an
inverting buffer.
The 3-STATE control gate operates as a two input
AND such that if either G1
and G2 are high, all
eight output a re in the high impedance state. In
TSSOPDIP SOP
ORDER CODES
PACKAGE TUBE T & R
DIP M74HC540B1R
SOP M74HC540M1R M74HC540RM13TR
TSSOP M74HC540TTR
order to enhance PC board layout the M74HC540
offer a pinout having inputs and outputs on
opposite sides of the package.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/10August 2001
Page 2
M74HC540
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1, 19 G1
2, 3, 4, 5, 6,
7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
10 GND Ground (0V)
20 V
TRUTH TABLE
INPUT OUTPUT
, G2 Output Enable Inputs
A1 to A8 Data Inputs
Y1
to Y8 Bus Outputs
CC
Positive Supply Voltage
G1
G2 An Yn
HXXZ
XHXZ
LLHL
LLLH
X : Don’t Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
I
or I
CC
P
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
Supply Voltage
CC
DC Input Voltage -0.5 to VCC + 0.5
I
DC Output Voltage -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current
DC Output Current
O
DC VCC or Ground Current
GND
Power Dissipation
D
Storage Temperature
stg
Lead Temperature (10 sec)
L
; derate to 30 0m W by 10mW/°C from 65
°C
°C to 85°C
-0.5 to +7 V
V
V
± 20 mA
± 20 mA
± 35 mA
± 70 mA
500(*) mW
-65 to +150 °C
300 °C
2/10
Page 3
M74HC540
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
V
V
T
t
r
DC SPECIFICATIONS
Symbol Parameter
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
I
CC
Supply Voltage
CC
Input Voltage 0 to V
I
Output Voltage 0 to V
O
Operating Temperature
op
Input Rise and Fall Time VCC = 2.0V
, t
f
V
V
= 4.5V
CC
= 6.0V
CC
Test Condition Value
T
= 25°C
A
Min. Typ. Max. Min. Max. Min. Max.
High Level Input
V
CC
(V)
2.0 1.5 1.5 1.5
Voltage
6.0 4.2 4.2 4.2
Low Level Input
2.0 0.5 0.5 0.5
Voltage
6.0 1.8 1.8 1.8
High Level Output
Voltage
Low Level Output
Voltage
Input Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6.0
6.0
IO=-20 µA
I
=-20 µA
O
I
=-20 µA
O
I
=-6.0 mA
O
I
=-7.8 mA
O
=20 µA
I
O
I
=20 µA
O
I
=20 µA
O
I
=6.0 mA
O
I
=7.8 mA
O
= VCC or GND
V
I
= VIH or V
V
I
IL
VO = VCC or GND
= VCC or GND
V
I
1.9 2.0 1.9 1.9
4.4 4.5 4.4 4.4
5.9 6.0 5.9 5.9
4.18 4.31 4.13 4.10
5.68 5.8 5.63 5.60
0.0 0.1 0.1 0.1
0.0 0.1 0.1 0.1
0.0 0.1 0.1 0.1
0.17 0.26 0.33 0.40
0.18 0.26 0.33 0.40
± 0.1 ± 1 ± 1 µA
± 0.5 ± 5 ± 10 µA
44080µA
2 to 6 V
CC
CC
-55 to 125 °C
0 to 1000 ns
0 to 500 ns
0 to 400 ns
-40 to 85°C -55 to 125°C
V
V
Unit
V4.5 3.15 3.15 3.15
V4.5 1.35 1.35 1.35
V
V
3/10
Page 4
M74HC540
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition Value
T
Symbol Parameter
t
TLH tTHL
t
PLH tPHL
t
PZL tPZH
Output Transition
Time
Propagation Delay
Time
High Impedance
Output Enable
Time
t
PLZ tPHZ
High Impedance
Output Disable
Time
C
V
CC
(V)
L
(pF)
2.0
50
6.0 6101315
2.0
50
6.0 9141822
2.0
150
6.0 12 20 25 30
2.0
R
50
= 1 KΩ
L
6.0 11 19 24 28
2.0
150
L
= 1 KΩ
R
6.0 14 23 29 35
2.0
R
50
= 1 KΩ
L
6.0 13 19 24 28
= 25°C
A
Min. Typ. Max. Min. Max. Min. Max.
25 60 75 90
40 85 105 130
56 115 145 175
47 110 140 165
61 135 170 205
52 110 140 165
-40 to 85°C -55 to 125°C
Unit
ns4.5 7121918
ns4.5 10 17 21 26
ns4.5 14 23 29 35
ns4.5 13 22 28 33
ns4.5 17 27 34 41
ns4.5 15 22 28 33
CAPACITIVE CHARACTERISTICS
Test Condition Value
T
Symbol Parameter
V
CC
(V)
C
C
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
Input Capacitance
IN
Power Dissipation
PD
Capacitance (note 1)5.0 31 pF
5.0 5101010pF
= 25°C
A
-40 to 85°C -55 to 125°C
Min. Typ. Max. Min. Max. Min. Max.
= CPD x VCC x fIN + ICC/8 (per gate)
CC(opr)
Unit
4/10
Page 5
TEST CIRCUIT
TEST SWITCH
t
, t
PLH
PHL
, t
t
PZL
PLZ
t
, t
PZH
PHZ
CL = 50pF/150p F or equivalen t (includes j i g and probe capacitance )
R
= 1KΩ or equivalent
1
R
= Z
of pulse generator (typically 50Ω)
T
OUT
M74HC540
Open
V
CC
GND
WAVEFORM 1: PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)
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Page 6
M74HC540
WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle )
6/10
Page 7
M74HC540
Plastic DIP-20 (0.25) MECHANICAL DATA
mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
a1 0.254 0.010
B 1.39 1.65 0.055 0.065
b 0.45 0.018
b1 0.25 0.010
D 25.4 1.000
E 8.5 0.335
e 2.54 0.100
e3 22.86 0.900
F 7.1 0.280
I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053
P001J
7/10
Page 8
M74HC540
SO-20 MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. M AX.
A 2.65 0.104
a1 0.1 0.2 0.004 0.008
a2 2.45 0.096
b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.012
C 0.5 0.020
c1 45° (typ.)
D 12.60 13.00 0.496 0.512
E 10.00 10.65 0.393 0.419
e 1.27 0.050
e3 11.43 0.450
F 7.40 7.60 0.291 0.300
L 0.50 1.27 0.020 0.050
M 0.75 0.029
S8° (max.)
mm. inch
8/10
PO13L
Page 9
M74HC540
TSSOP20 MECHANICAL DATA
mm. inch
DIM.
MIN. TYP MAX. MIN. TYP. M AX.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0089
D 6.4 6.5 6.6 0.252 0.256 0.260
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
A2
A
A1
b
e
K
c
L
E
D
E1
PIN 1 IDENTIFICATION
1
0087225C
9/10
Page 10
M74HC540
Information furnished is bel ieved to be accurate and reliable. However, STMicroe lectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No li cense is granted by i mp lication or otherwise under a ny patent or patent rig h ts of S TMic roelec tronics. Specifications
mentioned in this publication ar e subject to change without notice. This publication supersedes and replaces all information
previously supplied. S TMicroelectronics products are not authorized for use as critica l components in life suppo rt devices or
systems without express written approval of STMicroelectronics.
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