®
74LCX541
OCTAL BUS BUFFER (3-STATE NON INV.)
WITH 5V TOLERANT INPUTS AND OUTPUTS
s
s
s
s
s
s
s
s
s
s
5V TOLERANT INPUTS AND OUTPUTS
HIGH SPEED: t
PD
= 6.3 ns (MAX.) at V
CC
= 3V
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
PCI BUS LEVELS GUARANTEED AT 24mA
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2.0V to 3.6V (1.5V Data Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 541
LATCH-UP PERFORMANCE EXCEEDS 500mA
ESD PERFORMANCE:
HBM >2000V; MM > 200V
SOP
ORDER CODES
PACKAGE
SOP
TSSOP
T UBE
74LCX541AM
TSSOP
T& R
74LCX541AMTR
74LCX541ATTR
DESCRIPTION
The LCX541 is a low voltage CMOS OCTAL BUS
BUFFER (3-STATE) fabricated fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low
power and high speed 3.3V applications. it can
be interfaced to 5V signal environment for inputs.
The 3 STATE control gate operates as a two
input 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
LCX541 offers a pinout having inputs and outputs
on opposite sides of the package.
It has same speed performance at 3.3V than 5V,
AC/ACT family, combined with a lower power
consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
October 2000
1/9
74LCX541
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 19
2, 3, 4, 5,
6, 7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
10
20
SYMBOL
G1, G2
A1 to A8
Y1 to Y8
NAME AND FUNCT ION
Output Enable Input
Data Inputs
Data Outputs
TRUTH TABLE
INPUT
G1
H
X
L
L
X:”H” or ”L”
Z: High impedance
OUTPUT
An
X
X
H
L
Yn
Z
Z
H
L
G2
X
H
L
L
GND
V
CC
Ground (0V)
Positive Supply Voltage
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage (OFF state)
DC Output Voltage (High or Low State) (note1)
DC Input Diode Current
DC Output Diode Current (note2)
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Supply Pin
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to + 7.0
-0.5 to + 7.0
-0.5 to + 7.0
-0.5 to V
CC
+ 0.5
- 50
±
50
±
50
±
100
±
100
-65 to +150
300
Unit
V
V
V
V
mA
mA
mA
mA
mA
o
o
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
1) I
O
absolute maximum rating must be observed
2) V
O
< GND, V
O
> V
CC
2/9
74LCX541
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
V
O
I
OH
, I
OL
I
OH
, I
OL
T
op
dt/dv
Input Voltage
Output Voltage (OFF state)
Output Voltage (High or Low State)
High or Low Level Output Current (V
CC
= 3.0 to 3.6V)
High or Low Level Output Current (V
CC
= 2.7 to 3.0V)
Operating Temperature:
Input Transition Rise or Fall Rate (V
CC
= 3.0V) (note 2)
Parameter
Supply Voltage (note 1)
Value
2.0 to 3.6
0 to 5.5
0 to 5.5
0 to V
CC
±
24
±
12
-40 to+85
0 to 10
Unit
V
V
V
V
mA
mA
o
C
ns/V
1) Truth Table guaranteed: 1.5V to3.6V
2) V
IN
from0.8V to 2.0V
DC SPECIFICATIONS
Symb ol
Parameter
V
CC
(V)
V
IH
V
IL
V
OH
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
2.7 to 3.6
2.7 to 3.6
2.7
3.0
V
OL
Low Level Output Voltage
2.7 to 3.6
2.7
3.0
3.0
I
I
I
OZ
I
off
I
CC
Input Leakage Current
3 State Output Leakage Current
Power Off Leakage Current
Quiescent Supply Current
2.7 to 3.6
2.7 to 3.6
0
2.7 to 3.6
V
I
= V
IH
or V
IL
V
I
= V
IH
or V
IL
I
O
=-100
µA
I
O
=-12 mA
I
O
=-18 mA
I
O
=-24 mA
I
O
=100
µA
I
O
=12 mA
I
O
=16 mA
I
O
=24 mA
V
I
= 0 to 5.5 V
V
I
= V
IH
orV
IL
V
O
= 0 to 5.5V
V
I
orV
O
= 5.5V
V
I
= V
CC
orGND
V
I
orV
O
=
3.6 to 5.5V
∆I
CC
ICC incr. per input
2.7 to 3.6
V
IH
= V
CC
-0.6V
Test Co nditi ons
Value
-40 to 85 C
Min.
2.0
0.8
V
CC
-0.2
2.2
2.4
2.2
0.2
0.4
0.4
0.55
±5
±5
100
10
±10
500
µA
µA
µA
µA
µA
V
V
Max.
V
V
o
Un it
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol
Parameter
V
CC
(V)
V
OLP
V
OLV
Dynamic Low Voltage Quiet Output
(note 1)
3.3
C
L
= 50 pF
V
IL
= 0 V
V
IH
= 3.3V
Test Con dition s
Min .
Value
T
A
= 25 C
T yp.
0.8
-0.8
V
Max.
o
Un it
1) Number ofoutputs defined as ”n”. Measured with”n-1” outputs switching from HIGH to LOW or LOW t o HIGH. The remaining output is measured in
the LOW state.
3/9
74LCX541
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, R
L
= 500
Ω,
Input t
r
= t
f
= 2.5 ns)
Symb ol
Parameter
V
CC
(V)
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
t
OSLH
t
OSHL
Propagation Delay Time
Output Enable Time
Output Disable Time
Output to Output Skew Time (note 1, 2)
2.7
3.0 to 3.6
2.7
3.0 to 3.6
2.7
3.0 to 3.6
3.0 to 3.6
Test Con dition
Value
-40 to 85
o
C
Min. Max.
1.5
9.0
1.5
1.5
1.5
1.5
1.5
8.0
9.5
8.5
8.5
7.5
1.0
Un it
ns
ns
ns
ns
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any twooutputs of the same device switching in the
same direction, either HIGH or LOW (t
OSLH
= |t
PLHm
- t
PLHn
|, t
OSHL
= |t
PHLm
- t
pHLn
|)
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
V
CC
(V)
C
IN
C
OUT
C
PD
Input Capacitance
Output Capacitance
Power Dissipation Capacitance (note 1)
3.3
3.3
3.3
V
IN
= 0 to V
CC
V
IN
= 0 to V
CC
f
IN
= 10MHz
V
IN
= 0 or V
CC
Test Co nditi ons
Min.
Valu e
T
A
= 25 C
T yp.
6
12
25
Max.
pF
pF
pF
o
Un it
1) C
PD
isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. Average
operting current can be obtained by the following equation. I
CC
(opr) = C
PD
•
V
CC
•
f
IN
+ I
CC
/8 (per Buffer)
4/9
74LCX541
TEST CIRCUIT
T EST
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
C
L
= 50 pF or equivalent (includes jigand probe capacitance)
R
L
= R
1
= 500Ω orequivalent
R
T
= Z
OUT
of pulse generator (typically 50Ω)
SW IT CH
Open
6V
GND
WAVEFORM 1: PROPAGATION DELAYS
(f=1MHz; 50% duty cycle)
5/9
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