74LVQ244_04 [STMICROELECTRONICS]
LOW VOLTAGE OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED); 采用低压八路总线缓冲器3态输出（非反相）
| 型号： | 74LVQ244_04 |
| 厂家： | 
ST |
| 描述： | LOW VOLTAGE OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (NON INVERTED) |
| 文件： | 总12页 (文件大小：260K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74LVQ241
LOW VOLTAGE OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON INVERTED)
■
HIGH SPEED:
= 5.5 ns (TYP.) at V = 3.3 V
t
PD
CC
■
■
COMPATIBLE WITH TTL OUTPUTS
LOW POWER DISSIPATION:
I
= 4 µA (MAX.) at T =25°C
CC
A
■
■
■
LOW NOISE:
= 0.4V (TYP.) at V = 3.3V
75Ω TRANSMISSION LINE OUTPUT DRIVE
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
SOP
TSSOP
V
OLP
CC
Table 1: Order Codes
PACKAGE
|I | = I = 12mA (MIN) at V = 3.0 V
T & R
OH
OL
CC
■
■
PCI BUS LEVELS GUARANTEED AT 24 mA
BALANCED PROPAGATION DELAYS:
SOP
74LVQ241MTR
74LVQ241TTR
TSSOP
t
t
PHL
PLH
■
■
■
OPERATING VOLTAGE RANGE:
(OPR) = 2V to 3.6V (1.2V Data Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 241
technology. It is ideal for low power and low noise
3.3V applications.
1G and 2G output control governs four BUS
BUFFERs.
This device is designed to be used with 3 state
memory address drivers, etc.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
V
CC
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74LVQ241 is a low voltage CMOS OCTAL
BUS BUFFER fabricated with sub-micron silicon
2
gate and double-layer metal wiring C MOS
Figure 1: Pin Connection And IEC Logic Symbols
Rev. 7
1/12
August 2004
74LVQ241
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
PIN N°
SYMBOL
NAME AND FUNCTION
1
1G
Output Enable Input
2, 4, 6, 8
9, 7, 5, 3
1A1 to 1A4 Data Inputs
2Y1 to 2Y4 Data Outputs
2A1 to 2A4 Data Inputs
11, 13, 15,
17
18, 16, 14,
12
1Y1 to 1Y4 Data Outputs
19
10
20
2G
Output Enable Input
GND
Ground (0V)
V
Positive Supply Voltage
CC
Table 3: Truth Table
INPUTS
OUTPUT
1Yn
INPUTS
OUTPUT
2Yn
1G
1An
2G
2An
L
L
L
H
X
L
H
Z
H
H
L
L
H
X
L
H
Z
H
X : Don‘t Care
Z : High Impedance
Table 4: Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7
V
V
CC
V
DC Input Voltage
-0.5 to V + 0.5
I
CC
V
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
-0.5 to V + 0.5
V
O
CC
I
± 20
± 20
mA
mA
mA
mA
°C
°C
IK
I
OK
I
± 50
O
I
or I
DC V or Ground Current
±400
CC
GND
CC
T
Storage Temperature
-65 to +150
300
stg
T
Lead Temperature (10 sec)
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
Table 5: Recommended Operating Conditions
Symbol
Parameter
Value
Unit
V
Supply Voltage (note 1)
Input Voltage
2 to 3.6
V
V
CC
V
0 to V
I
CC
V
Output Voltage
0 to V
V
O
CC
T
Operating Temperature
-55 to 125
0 to 10
°C
ns/V
op
Input Rise and Fall Time V = 3.0V (note 2)
dt/dv
CC
1) Truth Table guaranteed: 1.2V to 3.6V
2) V from 0.8V to 2V
IN
2/12
74LVQ241
Table 6: DC Specifications
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
T = 25°C
Symbol
Parameter
A
V
CC
(V)
V
High Level Input
Voltage
IH
2.0
2.0
2.0
V
V
3.0 to
3.6
V
Low Level Input
Voltage
IL
0.8
0.8
0.8
V
High Level Output
Voltage
I =-50 µA
2.9
2.99
2.9
2.48
2.2
2.9
2.48
2.2
OH
O
I =-12 mA
3.0
3.0
2.58
V
V
O
I =-24 mA
O
V
Low Level Output
Voltage
I =50 µA
0.002 0.1
0.1
0.1
OL
O
I =12 mA
0
0.36
0.44
0.55
0.44
0.55
O
I =24 mA
O
I
Input Leakage
Current
I
V = V or GND
3.6
3.6
± 0.1
± 0.5
4
± 1
± 5
40
± 1
± 10
40
µA
µA
µA
I
CC
I
High Impedance
Output Leakage
Current
OZ
V = V or V
IL
I
IH
V
= V or GND
CC
O
I
Quiescent Supply
Current
CC
V = V or GND
3.6
3.6
I
CC
I
I
V
= 0.8 V max
= 2 V min
OHD
36
25
mA
mA
OLD
OLD
Dynamic Output
Current (note 1, 2)
V
-25
-25
OHD
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 75Ω
Table 7: Dynamic Switching Characteristics
Test Condition
Value
T = 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
V
Dynamic Low
Voltage Quiet
Output (note 1, 2)
0.4
0.8
0.8
OLP
3.3
3.3
V
V
V
-0.8
2
-0.5
OLV
V
Dynamic High
Voltage Input
(note 1, 3)
IHD
C = 50 pF
L
V
Dynamic Low
Voltage Input
(note 1, 3)
3.3
V
ILD
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V ), 0V to threshold
ILD
(V ), f=1MHz.
IHD
3/12
74LVQ241
Table 8: AC Electrical Characteristics (C = 50 pF, R = 500 Ω, Input t = t = 3ns)
L
L
r
f
Test Condition
Value
T = 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
t
t
t
t
Propagation Delay
Time
2.7
.
6.6
5.5
8.3
6.8
7.5
5.8
0.5
0.5
11
9
12.5
9.5
14
11
PLH PHL
ns
ns
ns
(*)
3.3
2.7
t
Output Enable
Time
13.5
10
18
18
13
15
12
1.0
1.0
PZL PZH
(*)
11.5
13.5
10.5
1.0
3.3
2.7
t
Output Disable
Time
12
PLZ PHZ
(*)
9.0
1.0
1.0
3.3
2.7
t
t
Output To Output
Skew Time
(note1, 2)
OSLH
ns
(*)
1.0
OSHL
3.3
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (t
2) Parameter guaranteed by design
(*) Voltage range is 3.3V ± 0.3V
= |t
- t
|, t
= |t
- t
|)
OSLH
PLHm PLHn OSHL
PHLm PHLn
Table 9: Capacitive Characteristics
Test Condition
Value
T = 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
C
Input Capacitance
3.3
3.3
4
pF
pF
IN
Output
Capacitance
C
8
OUT
C
Power Dissipation
Capacitance
(note 1)
PD
f
= 10MHz
3.3
10
pF
IN
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
PD
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
= C x V x f + I /8 (per circuit)
CC(opr)
PD CC IN CC
4/12
74LVQ241
Table 10: Test Circuit
TEST
SWITCH
Open
2V
t
t
t
, t
PLH PHL
, t
PZL PLZ
CC
, t
Open
PZH PHZ
C
R
R
= 50pF or equivalent (includes jig and probe capacitance)
L
L
T
= R = 500Ω or equivalent
1
= Z
of pulse generator (typically 50Ω)
OUT
Figure 3: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
5/12
74LVQ241
Figure 4: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
6/12
74LVQ241
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
7/12
74LVQ241
TSSOP20 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.2
MIN.
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
8/12
74LVQ241
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
9/12
74LVQ241
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
10/12
74LVQ241
Table 11: Revision History
Date
Revision
Description of Changes
Ordering Codes Revision - pag. 1.
02-Aug-2004
7
11/12
74LVQ241
Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
All other names are the property of their respective owners
© 2004 STMicroelectronics - All Rights Reserved
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12/12
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