74LCX541_07 [STMICROELECTRONICS]
LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS; 低压CMOS八路总线缓冲器（三态） ，容许5V输入和输出
| 型号： | 74LCX541_07 |
| 厂家： | 
ST |
| 描述： | LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE) WITH 5V TOLERANT INPUTS AND OUTPUTS |
| 文件： | 总17页 (文件大小：296K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74LCX541
Low voltage CMOS octal bus buffer (3-state)
with 5V tolerant inputs and outputs
Features
■ 5V tolerant inputs and outputs
■ High speed:
– t = 8.0ns (Max) at V = 3V
PD
CC
■ Power down protection on inputs and outputs
■ Symmetrical output impedance:
SO-20
TSSOP20
– |I | = I = 24mA (Min) at V = 3V
OH
OL
CC
■ PCI bus levels guaranteed at 24mA
■ Balanced propagation delays:
Description
– t
≅ t
PHL
PLH
The 74LCX541 is a low voltage CMOS octal bus
buffer (non-inverted) fabricated with sub-micron
silicon gate and double-layer metal wiring C MOS
technology. It is ideal for low power and high
speed 3.3V applications; it can be interfaced to
5V signal environment for both inputs and
outputs.
■ Operating voltage range:
– V (Opr) = 2.0V to 3.6V
2
CC
■ Pin and function compatible with
74 series 541
■ Latch-up performance exceeds
500mA (JESD 17)
The 3 STATE control gate operates as 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 74LCX541
offers a pinout having inputs and outputs on
opposite sides of the package.
■ ESD performance:
– HBM > 2000V
(MIL STD 883 method 3015); MM > 200V
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.
Order codes
Part number
Package
SO-20
Packaging
74LCX541MTR
Tape and reel
Tape and reel
74LCX541TTR
TSSOP20
January 2007
Rev 5
1/17
www.st.com
17
Contents
74LCX541
Contents
1
2
Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
4
Logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1
Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
6
7
8
9
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
74LCX541
Logic symbols and I/O equivalent circuit
1
Logic symbols and I/O equivalent circuit
Figure 1. IEC logic symbols
Figure 2. Input and output equivalent circuit
3/17
Pin settings
74LCX541
2
Pin settings
2.1
Pin connection
Figure 3. Pin connection (top through view)
2.2
Pin description
Table 1. Pin description
Pin N°
Symbol
G1, G2
Name and function
Output enable inputs
1, 19
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
20
GND
VCC
Ground (0V)
Positive supply voltage
4/17
74LCX541
Logic states
3
Logic states
3.1
Truth table
Table 2. Truth table
Input
G2
X
Output
G1
H
X
An
X
Yn
Z
H
X
Z
L
L
H
L
L
L
L
H
Note:
X : Do not care
Z : High impedance
5/17
Maximum rating
74LCX541
4
Maximum rating
Stressing the device above the rating listed in the “absolute maximum ratings” table may
cause permanent damage to the device. these are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. exposure to absolute maximum rating conditions for
extended periods may affect device reliability. refer also to the STMicroelectronics sure
program and other relevant quality documents.
Table 3. Absolute maximum ratings
Symbol
Parameter
Value
Unit
V
VCC
Supply voltage
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
-0.5 to VCC + 0.5
VI
VO
VO
IIK
DC input voltage
V
DC output voltage (OFF state)
V
DC output voltage (high or low state) (1)
DC input diode current
V
-50
-50
mA
mA
mA
mA
mA
°C
°C
DC output diode current (2)
DC output current
IOK
IO
±50
ICC
IGND
Tstg
TL
DC supply current per supply pin
DC ground current per supply pin
Storage temperature
± 100
± 100
-65 to +150
300
Lead temperature (10 sec)
1. IO absolute maximum rating must be observed
2. VO < GND
4.1
Recommended operating conditions
Table 4. Recommended operating conditions
Symsbol
Parameter
Value
2.0 to 3.6
0 to 5.5
0 to 5.5
0 to VCC
Unit
V
Supply voltage (1)
Input voltage
VCC
VI
V
VO
VO
Output voltage (OFF state)
V
Output voltage (high or low state)
V
IOH, IOL High or low level output current (VCC = 3.0 to 3.6V)
OH, IOL High or low level output current (VCC = 2.7V)
± 24
± 12
mA
mA
°C
ns/V
I
Top
Operating temperature
Input rise and fall time (2)
-40 to 85
0 to 10
dt/dv
1. Truth table guaranteed: 1.5V to 3.6V
2. VIN from 0.8V to 2V at VCC = 3.0V
6/17
74LCX541
Electrical characteristics
5
Electrical characteristics
Table 5. DC specifications
Test condition
Value
-40 to 85°C
Symbol
Parameter
Unit
VCC
(V)
Min
Max
VIH
VIL
High level input voltage
Low level input voltage
2.0
V
V
2.7 to 3.6
0.8
I
O = -100µA
VCC-0.2
2.2
2.7 to 3.6
2.7
IO = -12mA
VOH
High level output voltage
V
V
I
I
O = -18mA
O = -24mA
2.4
3.0
2.2
IO = 100µA
2.7 to 3.6
2.7
0.2
0.4
IO = 12mA
VOL
Low level output voltage
Input leakage current
I
I
O = 16mA
O = 24mA
0.4
3.0
0.55
± 5
II
VI = 0 to 5.5V
2.7 to 3.6
0
µA
µA
Power OFF leakage
current
Ioff
VI or VO = 5.5V
10
VI = VIH or VIL
VO = 0 to VCC
High impedance output
leakage current
IOZ
2.7 to 3.6
± 5
µA
VI = VCC or GND
VI or VO = 3.6 to 5.5V
VIH = VCC - 0.6V
10
ICC
Quiescent supply current 2.7 to 3.6
I incr. per Input 2.7 to 3.6
µA
µA
± 10
500
∆ICC
Table 6. Dynamic switching characteristics
Test condition
Value
TA = 25 °C
Symbol
Parameter
Unit
VCC
(V)
Min Typ Max
VOLP
VOLV
CL = 50pF
VIL = 0V, VIH = 3.3V
0.8
Dynamic low level quiet
output (1)
3.3
V
-0.8
1. Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to
HIGH. The remaining output is measured in the LOW state.
7/17
Electrical characteristics
74LCX541
Table 7. AC electrical characteristics
Test condition
Value
-40 to 85 °C
Symbol
Parameter
Unit
ns
VCC
(V)
CL
RL
ts = tr
(ns)
(pF)
(Ω)
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
9.0
8.0
9.5
8.5
8.5
7.5
tPLH tPHL Propagation delay
2.7
3.0 to 3.6
2.7
50
50
50
500
500
500
2.5
2.5
2.5
time
t
PZL tPZH Output enable
time
ns
3.0 to 3.6
2.7
tPLZ tPHZ Output disable
time
ns
3.0 to 3.6
tOSLH
tOSHL
output to output
skew time (1) (2)
3.0 to 3.6
50
500
2.5
1.0
ns
1. Skew is defined as the absolute value of the difference between the actual propagation delay for any two
outputs of the same device switching in the same direction, either HIGH or LOW (tOSLH = | tPLHm - tPLHn|,
t
OSHL = | tPHLm - tPHLn|)
2. Parameter guaranteed by design
Table 8. Capacitive characteristics
Test condition
Value
TA = 25 °C
Symbol
Parameter
Unit
VCC
(V)
Min
Typ
6
Max
CIN
VIN = 0 to VCC
VIN = 0 to VCC
IN = 10MHz
VIN = 0 or VCC
Input capacitance
Output capacitance
3.3
3.3
pF
pF
COUT
12
f
Power dissipation
capacitance (1)
CPD
3.3
25
pF
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. ICC(opr) = CPD x VCC x fIN + ICC/8 (per buffer)
8/17
74LCX541
Test circuit
6
Test circuit
Figure 4. Test circuit
Figure 5. Test circuit
Test
tPLH, tPHL
PZL, tPLZ
PZH, tPHZ
Switch
Open
t
6V
t
GND
C = 50pF or equivalent (includes jig and probe capacitance)
L
R = R = 500Ω or equivalent
L
1
R = Z
of pulse generator (typically 50Ω)
T
OUT
9/17
Waveforms
74LCX541
7
Waveforms
Figure 6. Propagation delays (f = 1MHz; 50% duty cycle)
Figure 7. Output enable and disable time (f = 1MHz; 50% duty cycle)
10/17
74LCX541
Package mechanical data
8
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect . The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
11/17
Package mechanical data
74LCX541
SO-20 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
MIN.
MAX.
A
A1
B
2.35
2.65
0.093
0.104
0.1
0.33
0.23
12.60
7.4
0.30
0.51
0.32
13.00
7.6
0.004
0.013
0.009
0.496
0.291
0.012
0.020
0.013
0.512
0.299
C
D
E
e
1.27
0.050
H
10.00
0.25
0.4
10.65
0.75
1.27
8°
0.394
0.010
0.016
0°
0.419
0.030
0.050
8°
h
L
k
0°
ddd
0.100
0.004
0016022D
12/17
74LCX541
Package mechanical data
TSSOP20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
1.2
MIN.
TYP.
MAX.
0.047
0.006
0.041
0.012
0.0079
0.260
0.260
0.176
A
A1
A2
b
0.05
0.8
0.15
1.05
0.30
0.20
6.6
0.002
0.031
0.007
0.004
0.252
0.244
0.169
0.004
0.039
1
0.19
0.09
6.4
c
D
6.5
6.4
0.256
0.252
E
6.2
6.6
E1
e
4.3
4.4
4.48
0.173
0.65 BSC
0.0256 BSC
K
0˚
8˚
0˚
8˚
L
0.45
0.60
0.75
0.018
0.024
0.030
A2
A
K
L
b
e
A1
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
13/17
Package mechanical data
74LCX541
Tape & Reel SO-20 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
30.4
11
1.197
0.433
0.528
0.130
0.161
0.476
Ao
Bo
Ko
Po
P
10.8
13.2
3.1
0.425
0.520
0.122
0.153
0.468
13.4
3.3
3.9
4.1
11.9
12.1
14/17
74LCX541
Package mechanical data
Tape & Reel TSSOP20 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
22.4
7
0.882
0.276
0.280
0.075
0.161
0.476
Ao
Bo
Ko
Po
P
6.8
6.9
0.268
0.272
0.067
0.153
0.468
7.1
1.9
4.1
12.1
1.7
3.9
11.9
15/17
Revision history
74LCX541
9
Revision history
Table 9. Revision history
Date
Revision
Changes
Ordering Codes Revision - pag. 1.
The document has been reformatted, temperature ranges updated
15-Sep-2004
24-Jan-2007
4
5
16/17
74LCX541
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17/17
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