74VHC240T [STMICROELECTRONICS]
OCTAL BUS BUFFER WITH 3 STATE OUTPUTS INVERTED; 八路总线缓冲器，具有3态输出INVERTED
| 型号： | 74VHC240T |
| 厂家： | 
ST |
| 描述： | OCTAL BUS BUFFER WITH 3 STATE OUTPUTS INVERTED |
| 文件： | 总8页 (文件大小：68K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74VHC240
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
■
■
HIGH SPEED:tPD =3.6ns (TYP.) atVCC = 5V
LOW POWER DISSIPATION:
ICC =4 µA (MAX.) at TA =25 oC
HIGH NOISEIMMUNITY:
■
VNIH = VNIL =28% VCC (MIN.)
POWERDOWN PROTECTIONON INPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
BALANCEDPROPAGATIONDELAYS:
tPLH tPHL
M
T
■
■
(Micro Package)
(TSSOPPackage)
ORDER CODES :
74VHC240M
74VHC240T
■
■
■
OPERATING VOLTAGERANGE:
VCC (OPR)= 2V to 5.5V
This device is designed to be used with 3 state
memory address drivers, etc.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage. This device can be
used to interface5V to 3V.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN AND FUNCTION COMPATIBLEWITH
74 SERIES240
IMPROVED LATCH-UP IMMUNITY
LOWNOISE:VOLP = 0.9V(Max.)
■
■
DESCRIPTION
The 74VHC240 is an advanced high-speed
CMOS OCTAL BUS BUFFER (3-STATE)
fabricated with sub-micron silicon gate and
double-layermetal wiring C2MOS technology.
G output enable governs four BUS BUFFERs.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/8
June 1999
74VHC240
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL NAME AND FUNCTION
1G Output Enable Input
2,4,6,8
9,7,5,3
1A1to1A4 Data Inputs
2Y1to2Y4 Data Outputs
11,13, 15,17 2A1to2A4 Data Inputs
18,16, 14,12 1Y1to1Y4 Data Outputs
19
10
20
2G
GND
VCC
Output Enable Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUT
OUTPUT
G
L
An
L
Yn
H
L
H
L
H
X:”H” or”L”
X
Z
Z:Highimpedance
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VCC
VI
Supply Voltage
-0.5to+7.0
-0.5to+7.0
V
V
DC Input Voltage
VO
IIK
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
-0.5toVCC +0.5
-20
V
mA
mA
mA
mA
oC
oC
IOK
IO
± 20
± 25
ICC orIGND DC VCC or Ground Current
± 75
Tstg
Storage Temperature
-65to+150
TL
Lead Temperature (10 sec)
300
AbsoluteMaximum Ratingsarethose values beyond whichdamage tothe device may occur. Functional operation under these condition isnot implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
Parameter
Value
2.0to5.5
0to5.5
Unit
V
Supply Voltage
Input Voltage
V
VO
Output Voltage
0toVCC
-40to+85
V
oC
Top
Operating Temperature
dt/dv
0to100
0to20
ns/V
ns/V
Input Rise and Fall Time (see note 1) (VCC = 3.3 0.3V)
±
(V CC = 5.0 ± 0.5V)
1)VIN from30% to70%of VCC
2/8
74VHC240
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
VCC
(V)
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
-40 to 85 oC
VIH
VIL
High Level Input
Voltage
2.0
3.0 to 5.5
2.0
1.5
1.5
V
V
0.7VCC
0.7VCC
Low Level Input
Voltage
0.5
0.5
3.0 to 5.5
2.0
0.3VCC
0.3VCC
VOH
High Level Output
Voltage
I =-50 A
1.9
2.9
2.0
3.0
4.5
1.9
2.9
µ
O
3.0
I =-50 A
µ
O
V
V
4.5
I =-50 A
4.4
4.4
µ
O
3.0
IO=-4mA
IO=-8mA
2.58
3.94
2.48
3.8
4.5
VOL
Low Level Output
Voltage
2.0
I =50 A
0.0
0.0
0.0
0.1
0.1
0.1
0.1
µ
O
3.0
I =50 A
µ
O
4.5
I =50 A
0.1
0.1
µ
O
3.0
IO=4mA
IO=8mA
0.36
0.36
0.44
0.44
4.5
IOZ
High Impedance
Output Leakage
Current
V = VIH orVIL
VO =VCC orGND
0.25
±
2.5
±
A
µ
I
5.5
II
Input Leakage Current
0to5.5
5.5
VI =5.5Vor GND
0.1
1.0
A
µ
±
±
ICC
Quiescent Supply
Current
V =VCC orGND
I
4
40
A
µ
AC ELECTRICAL CHARACTERISTICS (Input tr = tf =3 ns)
Symbol
Parameter
Test Condition
Value
TA = 25 oC
Unit
VCC
CL
-40 to 85 oC
(V)
(pF)
Min. Typ. Max. Min. Max.
(*)
tPLH
tPHL
Propagation Delay
Time
3.3
15
50
5.3
7.8
3.6
5.1
6.6
9.1
4.7
6.2
10.3
6.7
7.5
11.0
5.5
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
9.0
12.5
6.5
(*)
3.3
ns
ns
(**)
5.0
15
50
15
50
15
50
50
50
50
50
(**)
5.0
7.5
8.5
(*)
tPZL
tPZH
Output Enable Time
Output Disable Time
3.3
RL =1KΩ
10.6
14.1
7.3
12.5
16.0
8.5
(*)
3.3
R =1K
Ω
L
(**)
5.0
RL= 1KΩ
(**)
5.0
R = 1K
9.3
10.5
16.0
10.5
1.5
Ω
L
(*)
tPLZ
tPHZ
3.3
RL =1KΩ
14.0
9.2
ns
ns
(**)
5.0
R =1K
Ω
L
(*)
tOSLH Output to Output Skew
tOSHL
3.3
1.5
(**)
Time (note 1)
5.0
1.0
1.0
(*) Voltagerangeis3.3V ± 0.3V
(**) Voltagerange is 5V 0.5V
±
Note1:Parameter guaranteed bydesign. tsoLH =|tpLHm-tpLHn|,tsoHL =|tpHLm -tpHLn
|
3/8
74VHC240
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
-40 to 85 oC
CIN
Input Capacitance
4
6
10
10
pF
pF
pF
COUT Output Capacitance
CPD
Power Dissipation
17
Capacitance (note 1)
1)CPD isdefined as thevalue ofthe IC’sinternal equivalent capacitance whichiscalculated fromthe operating current consumption without load. (Referto
TestCircuit).Average operating current can beobtained bythe followingequation. ICC(opr)= CPD • VCC • fIN + ICC/8(per Circuit)
DYNAMIC SWITCHING CHARACTERISTICS
Symbol
Parameter
Test Conditions
VCC
(V)
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
-40 to 85 oC
VOLP
VOLV
Dynamic Low Voltage
Quiet Output (note 1, 2)
5.0
0.6
0.9
-0.9
3.5
-0.6
V
IHD
Dynamic High Voltage
Input (note 1, 3)
5.0
5.0
CL = 50pF
V
VILD
Dynamic Low Voltage
Input (note 1, 3)
1.5
1)Worstcase package.
2)Max number ofoutputs defined as (n). Datainputs aredriven 0Vto5.0V, (n -1)outputs switching andone outputatGND.
3)Max number ofdatainputs (n)switching.(n-1)switching 0Vto5.0V. Inputsunder testswitching: 5.0Vtothreshold (VILD),0V tothreshold (VIHD),f=1MHz.
TEST CIRCUIT
TEST
SWITCH
Open
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
VCC
GND
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RL =R1 =1KΩ orequivalent
RT = ZOUT ofpulse generator (typically50Ω)
4/8
74VHC240
WAVEFORM 1: PROPAGATION DELAYS
(f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
5/8
74VHC240
SO-20 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
2.65
0.20
2.45
0.49
0.32
MIN.
MAX.
0.104
0.007
0.096
0.019
0.012
A
a1
a2
b
0.10
0.004
0.35
0.23
0.013
0.009
b1
C
0.50
0.020
c1
D
45 (typ.)
12.60
10.00
13.00
10.65
0.496
0.393
0.512
0.419
E
e
1.27
0.050
0.450
e3
F
11.43
7.40
0.50
7.60
1.27
0.75
0.291
0.19
0.299
0.050
0.029
L
M
S
8 (max.)
P013L
6/8
74VHC240
TSSOP20 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.1
MIN.
MAX.
0.433
0.006
0.374
0.0118
0.0079
0.260
0.256
0.176
A
A1
A2
b
0.05
0.85
0.19
0.09
6.4
0.10
0.9
0.15
0.95
0.30
0.2
0.002
0.335
0.0075
0.0035
0.252
0.246
0.169
0.004
0.354
c
D
6.5
6.4
6.6
0.256
0.252
E
6.25
4.3
6.5
E1
e
4.4
4.48
0.173
0.65 BSC
4o
0.0256 BSC
4o
K
0o
8o
0o
8o
L
0.50
0.60
0.70
0.020
0.024
0.028
A2
A
K
L
b
e
A1
E
c
D
E1
PIN 1 IDENTIFICATION
1
7/8
74VHC240
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. Specification 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.
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1999 STMicroelectronics – Printed in Italy – All Rights Reserved
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