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74AC240 [STMICROELECTRONICS]

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS INVERTED; 八路总线缓冲器，具有3态输出INVERTED
74AC240
型号： 74AC240
厂家： ST    ST
描述：

OCTAL BUS BUFFER WITH 3 STATE OUTPUTS INVERTED
八路总线缓冲器，具有3态输出INVERTED

输出元件
文件： 总8页 (文件大小：82K)
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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 -  
Singapore - Spain- Sweden- Switzerland - Taiwan - Thailand - United Kingdom - U.S.A  
.
8/8  

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