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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
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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
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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