1/9
April 2001
s
HIGH SPEED: t
PD
= 4ns (TYP.) at V
CC
= 5V
s
LOW POWER DISSIPATION:
I
CC
= 4
A(MAX.) at T
A
=25
C
s
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
s
50
TRANSMISSION LINE DRIVING
CAPABILITY
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24mA (MIN)
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 541
s
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74AC541 is an advanced high-speed CMOS
OCTAL BUS BUFFER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS tecnology.
The 3 STATE control gate operates as two inputs
AND such that if either G1 and G2 are high, all
eight outputs are in the high impedance state.
In order to enhance PC board layout, the
74AC541 offers a pinout having inputs and
outputs on opposite sides of the package.
All
inputs
and
outputs
are
equipped
with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
74AC541
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON INVERTED)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
DIP
74AC541B
SOP
74AC541M
74AC541MTR
TSSOP
74AC541TTR
TSSOP
DIP
SOP
74AC541
2/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don't Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
RECOMMENDED OPERATING CONDITIONS
1) V
IN
from 30% to 70% of V
CC
PIN No
SYMBOL
NAME AND FUNCTION
1, 19
G1, G2
Output Enable Inputs
2, 3, 4, 5, 6,
7, 8, 9
A1 to A8
Data Inputs
18, 17, 16,
15, 14, 13,
12, 11
Y1 to Y8
Data Outputs
10
GND
Ground (0V)
20
V
CC
Positive Supply Voltage
INPUTS
OUTPUT
G1
G2
An
Yn
H
X
X
Z
X
H
X
Z
L
L
H
H
L
L
L
L
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7
V
V
I
DC Input Voltage
-0.5 to V
CC
+ 0.5
V
V
O
DC Output Voltage
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
20
mA
I
OK
DC Output Diode Current
20
mA
I
O
DC Output Current
50
mA
I
CC
or I
GND
DC V
CC
or Ground Current
400
mA
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 6
V
V
I
Input Voltage
0 to V
CC
V
V
O
Output Voltage
0 to V
CC
V
T
op
Operating Temperature
-55 to 125
C
dt/dv
Input Rise and Fall Time V
CC
= 3.0, 4.5 or 5.5V (note 1)
8
ns/V
74AC541
3/9
DC SPECIFICATIONS
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25
C
-40 to 85
C
-55 to 125
C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
3.0
V
O
= 0.1 V or
V
CC
-0.1V
2.1
1.5
2.1
2.1
V
4.5
3.15
2.25
3.15
3.15
5.5
3.85
2.75
3.85
3.85
V
IL
Low Level Input
Voltage
3.0
V
O
= 0.1 V or
V
CC
-0.1V
1.5
0.9
0.9
0.9
V
4.5
2.25
1.35
1.35
1.35
5.5
2.75
1.65
1.65
1.65
V
OH
High Level Output
Voltage
3.0
I
O
=-50
A
2.9
2.99
2.9
2.9
V
4.5
I
O
=-50
A
4.4
4.49
4.4
4.4
5.5
I
O
=-50
A
5.4
5.49
5.4
5.4
3.0
I
O
=-12 mA
2.56
2.46
2.4
4.5
I
O
=-24 mA
3.86
3.76
3.7
5.5
I
O
=-24 mA
4.86
4.76
4.7
V
OL
Low Level Output
Voltage
3.0
I
O
=50
A
0.002
0.1
0.1
0.1
V
4.5
I
O
=50
A
0.001
0.1
0.1
0.1
5.5
I
O
=50
A
0.001
0.1
0.1
0.1
3.0
I
O
=12 mA
0.36
0.44
0.5
4.5
I
O
=24 mA
0.36
0.44
0.5
5.5
I
O
=24 mA
0.36
0.44
0.5
I
I
Input Leakage
Current
5.5
V
I
= V
CC
or GND
0.1
1
1
A
Ioz
High Impedance
Output Leakege
Current
5.5
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
0.3
2.5
5
A
I
CC
Quiescent Supply
Current
5.5
V
I
= V
CC
or GND
4
40
80
A
I
OLD
Dynamic Output
Current (note 1, 2)
5.5
V
OLD
= 1.65 V max
75
50
mA
I
OHD
V
OHD
= 3.85 V min
-75
-50
mA
74AC541
4/9
AC ELECTRICAL CHARACTERISTICS (C
L
= 50 pF, R
L
= 500
, Input t
r
= t
f
= 3ns)
(*) Voltage range is 3.3V
0.3V
(**) Voltage range is 5.0V
0.5V
CAPACITIVE CHARACTERISTICS
1) C
PD
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
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/8 (per circuit)
TEST CIRCUIT
C
L
= 50pF or equivalent (includes jig and probe capacitance)
R
L
= R
1
= 500
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25
C
-40 to 85
C
-55 to 125
C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
3.3
(*)
1.5
5.0
8.0
1.5
9.0
1.5
9.0
ns
5.0
(**)
1.5
4.0
6.5
1.5
7.0
1.5
7.0
t
PZL
t
PZH
Output Enable
Time
3.3
(*)
1.5
7.0
10.5
1.5
11.5
1.5
11.5
ns
5.0
(**)
1.5
5.0
8.0
1.5
8.5
1.5
8.5
t
PLZ
t
PHZ
Output Disable
Time
3.3
(*)
1.5
7.0
10.5
1.5
11.5
1.5
11.5
ns
5.0
(**)
1.5
5.0
9.0
1.5
9.5
1.5
9.5
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25
C
-40 to 85
C
-55 to 125
C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
C
IN
Input Capacitance
5.0
5
pF
C
OUT
Output
Capacitance
5.0
11
pF
C
PD
Power Dissipation
Capacitance (note
1)
5.0
f
IN
= 10MHz
30
pF
TEST
SWIT CH
t
PLH
, t
PHL
Open
t
PZL
, t
PLZ
2V
CC
t
PZH
, t
PHZ
Open
74AC541
5/9
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
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