74AC240B [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: | 74AC240B |
厂家: | ST |
描述: | OCTAL BUS BUFFER WITH 3 STATE OUTPUTS INVERTED |
文件: | 总8页 (文件大小:82K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
74AC240
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
■
■
HIGH SPEED: tPD = 4 ns (TYP.) at VCC = 5V
LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
HIGH NOISE IMMUNITY:
■
■
■
■
■
■
■
VNIH = VNIL = 28% VCC (MIN.)
50Ω TRANSMISSION LINE DRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL =24 mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH tPHL
OPERATING VOLTAGE RANGE:
B
M
(Plastic Package)
(Micro Package)
ORDER CODES :
74AC240B
74AC240M
mantaining high speed operation similar to
equivalentBipolar Schottky TTL.
G control output governs four BUS BUFFERs.
This device is designed to be used with 3 state
memory address drivers, etc.
VCC (OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 240
IMPROVED LATCH-UP IMMUNITY
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
DESCRIPTION
The AC240 is an advanced CMOS OCTAL BUS
BUFFER (3-STATE) fabricated with sub-micron
silicon gate and double-layer metal wiring C2MOS
technology. It is ideal for low power applications
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/8
April 1997
74AC240
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL NAME AND FUNCTION
1G Output Enable Input
2,4, 6, 8
9,7, 5, 3
1A1 to 1A4 Data Inputs
2Y1 to 2Y4 Data Outputs
11, 13, 15, 17 2A1 to 2A4 Data Inputs
18, 16, 14, 12 1Y1 to 1Y4 Data Outputs
19
10
20
2G
GND
VCC
Output Enabel Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUT
OUTPUT
G
L
An
L
Yn
H
L
H
L
H
X
Z
X:”H” or ”L”
Z: High impedance
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
-0.5 to +7
Unit
VCC
VI
Supply Voltage
V
V
DC Input Voltage
DC Output Voltage
DC Input Diode Current
-0.5 to VCC +0.5
-0.5 to VCC +0.5
± 20
VO
IIK
V
mA
mA
mA
mA
oC
oC
IOK
IO
DC Output Diode Current
DC Output Current
± 20
± 50
ICC or IGND DC VCC or Ground Current
± 400
Tstg
Storage Temperature
-65 to +150
TL
Lead Temperature (10 sec)
300
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Value
2 to 6
Unit
V
Supply Voltage
Input Voltage
Output Voltage
VI
0 to VCC
0 to VCC
-40 to +85
8
V
VO
V
oC
Top
Operating Temperature:
dt/dv
Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1)
ns/V
1) VIN from30% to 70% of VCC
2/8
74AC240
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
-40 to 85 oC
VIH
High Level Input Voltage
Low Level Input Voltage
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
5.5
5.5
VO =0.1 V or
2.1
1.5
2.1
VCC -0.1 V
V
V
3.15
3.85
2.25
2.75
1.5
3.15
3.85
V
IL
VO =0.1 V or
CC -0.1 V
0.9
0.9
1.35
1.65
V
2.25
2.75
2.99
4.49
5.49
1.35
1.65
VOH
High Level Output
Voltage
IO=-50 µA
2.9
4.4
2.9
4.4
VI(*)
IH or
VIL
=
IO=-50 µA
IO=-50 µA
IO=-12 mA
IO=-24 mA
IO=-24 mA
IO=50 µA
IO=50 µA
IO=50µΑ
IO=12mA
IO=24mA
IO=24mA
5.4
5.4
V
V
V
2.56
3.86
4.86
2.46
3.76
4.76
VOL
Low Level Output
Voltage
0.002
0.001
0.001
0.1
0.1
0.1
0.1
VI(*)
IH or
VIL
=
0.1
0.1
V
0.36
0.36
0.36
±0.1
±0.5
0.44
0.44
0.44
±1
II
Input Leakage Current
VI =VCC or GND
µA
µA
IOZ
3 State Output Leakage
Current
VI =VIH or V
±5
IL
VO =VCC or GND
ICC
Quiescent Supply
Current
5.5
5.5
VI =VCC or GND
8
80
µA
IOLD
IOHD
Dynamic Output Current
(note 1, 2)
VOLD =1.65 V max
VOHD = 3.85 V min
75
mA
mA
-75
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 Ω.
(*) All outputs loaded.
3/8
74AC240
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns)
Symbol
Parameter
Test Condition
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
-40 to 85 oC
(*)
tPLH
tPHL
Propagation Delay Time
Output Enable Time
Output Disable Time
3.3
1.5
1.5
1.5
1.5
1.5
1.5
5
4
7
5
7
6
8
6.5
10.5
8
1.5
1.5
1.5
1.5
1.5
1.5
9
ns
ns
ns
(**)
5.0
7
(*)
tPZL
tPZH
3.3
11.5
8.5
11.5
9.5
(**)
5.0
(*)
tPLZ
tPHZ
3.3
10.5
9
(**)
5.0
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is5V ± 0.5V
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Unit
VCC
-40 to 85 oC
(V)
Min. Typ. Max. Min. Max.
CIN
Input Capacitance
4
8
5.0
5.0
5.0
pF
pF
pF
COUT Output Capacitance
CPD
Power Dissipation
21
Capacitance (note 1)
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 • VCC • fIN + ICC/n (per circuit)
TEST CIRCUIT
TEST
SWITCH
Open
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
2VCC
Open
CL = 50 pF or equivalent (includes jig and probe capacitance)
RL =R1 = 500Ω or equivalent
RT =ZOUT of pulse generator (typically 50Ω)
4/8
74AC240
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
5/8
74AC240
Plastic DIP20 (0.25) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
0.254
1.39
TYP.
MAX.
MIN.
0.010
0.055
MAX.
a1
B
b
1.65
0.065
0.45
0.25
0.018
0.010
b1
D
E
e
25.4
1.000
8.5
2.54
22.86
0.335
0.100
0.900
e3
F
7.1
0.280
0.155
I
3.93
L
3.3
0.130
Z
1.34
0.053
P001J
6/8
74AC240
SO20 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
7/8
74AC240
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise underany patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics productsare notauthorized for use as criticalcomponents in life supportdevices or systems withoutexpress
written approval of SGS-THOMSON Microelectonics.
1997 SGS-THOMSON Microelectronics - Printedin Italy - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia- Brazil - Canada - China - France - Germany - Hong Kong - Italy- Japan- Korea - Malaysia- Malta- Morocco - TheNetherlands -
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.
8/8
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