74ACT280M [STMICROELECTRONICS]
9 BIT PARITY GENERATOR/CHECKER; 9位奇偶校验发生器/检验
| 型号： | 74ACT280M |
| 厂家： | 
ST |
| 描述： | 9 BIT PARITY GENERATOR/CHECKER |
| 文件： | 总8页 (文件大小：65K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT280
9 BIT PARITY GENERATOR/CHECKER
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HIGH SPEED:tPD =4 ns (TYP.) atVCC =5V
LOW POWER DISSIPATION:
CC =4 µA (MAX.) at TA =25 oC
I
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COMPATIBLEWITH TTL OUTPUTS
VIH =2V (MIN), VIL = 0.8V(MAX)
50Ω TRANSMISSIONLINEDRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
BALANCEDPROPAGATIONDELAYS:
tPLH tPHL
OPERATING VOLTAGERANGE:
B
M
(Plastic Package)
(Micro Package)
ORDER CODES :
74ACT280B
74ACT280M
nine data inputs control the output conditions.
When the number of high level input is odd,
ΣODD output is kept high and ΣEVEN output low.
Conservely, when the output is even, EVEN
output is kept high and ΣODD low.
The IC generates either odd or even parity
making it flexible application.
The word-length capability is easily expanded by
cascading.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
VCC (OPR)= 4.5V to 5.5V
Σ
PIN AND FUNCTION COMPATIBLEWITH
74 SERIES280
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The AC280 is an advanced high-speed CMOS 9
BIT PARITY GENERATOR
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.It is
ideal for low power applications mantaining high
speed operation similar to eqivalent Bipolar
SchottkyTTL.
It is composed of nine data inputs (A to I) and
odd/even parity outputs ( ODD and EVEN). The
-
CHECKER
Σ
Σ
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/8
December 1998
74ACT280
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL NAME AND FUNCTION
5, 6
EVEN
Parity Outputs
Σ
ΣODD
8, 9, 10, 11,
12, 13, 1, 2,
4
A to I
Data Inputs
3
7
NC
GND
VCC
No Connection
Ground (0V)
14
Positive Supply Voltage
TRUTH TABLE
NUMBER OF INPUT A TRHU I THAT ARE HIGH
OUTPUT
EVEN
ODD
L
Σ
Σ
0, 2, 4, 6, 8
1, 3, 5, 7, 9
H
L
H
LOGIC DIAGRAM
2/8
74ACT280
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VI
Parameter
Value
-0.5 to +7
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
± 20
Unit
V
Supply Voltage
DC Input Voltage
V
VO
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
V
IIK
mA
mA
mA
mA
oC
IOK
± 20
IO
50
±
ICC or IGND DC VCC or Ground Current
200
±
Tstg
TL
Storage Temperature
-65 to +150
300
Lead Temperature (10 sec)
oC
AbsoluteMaximum Ratingsarethose values beyond whichdamage tothe device may occur. Functional operation under these condition isnot implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
Parameter
Value
4.5 to 5.5
0 to VCC
0 to VCC
-40 to +85
8
Unit
V
Supply Voltage
Input Voltage
V
VO
Output Voltage
V
oC
Top
Operating Temperature:
dt/dv
Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1)
ns/V
1)VIN from0.8V to2.0V
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Unit
VCC
-40 to 85 oC
(V)
Min. Typ. Max. Min. Max.
VIH
VIL
High Level Input Voltage
Low Level Input Voltage
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
5.5
5.5
5.5
VO = 0.1V or
VCC - 0.1 V
2.0
2.0
1.5
1.5
2.0
2.0
V
V
V
VO = 0.1V or
VCC - 0.1 V
1.5
0.8
0.8
0.8
0.8
1.5
VOH
High Level Output
Voltage
IO=-50 µA
IO=-50 µA
4.4
5.4
4.49
5.49
4.4
5.4
VI(*)
VIH or
VIL
=
IO=-24 mA 3.86
IO=-24 mA 4.86
3.76
4.76
VOL
Low Level Output
Voltage
I =50
O
A
0.001 0.1
0.1
0.1
0.44
0.44
±1
µ
VI(*)
=
V
IO=50 mA
IO=24 mA
IO=24 mA
0.001 0.1
VIH or
VIL
0.36
0.36
II
Input Leakage Current
Max ICC /Input
VI = VCC or GND
VI = VCC -2.1 V
VI = VCC or GND
±0.1
µA
ICCT
ICC
0.6
1.5
40
mA
Quiescent Supply
Current
4
A
µ
IOLD
IOHD
Dynamic Output Current
(note 1, 2)
5.5
VOLD = 1.65 V max
VOHD = 3.85 V min
75
mA
mA
-75
1) Maximum test duration 2ms, one output loaded attime
2)Incident wave switchingis guaranteed ontransmission lines withimpedances aslowas50
Ω
.
3/8
74ACT280
AC ELECTRICAL CHARACTERISTICS
(CL = 50 pF, RL = 500 Ω, Input tr = t =3 ns)
f
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
(Input - ΣODD, ΣEVEN)
5.0(*)
3.0
8.5
13.0
2.0
14.5
ns
(*) Voltagerangeis5V ± 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
5.0
5.0
pF
pF
CPD
Power Dissipation
75
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
TEST CIRCUIT
CL = 50 pF or equivalent (includes jigand probe capacitance)
RL =R1 =500Ω orequivalent
RT = ZOUT ofpulse generator (typically50Ω)
4/8
74ACT280
WAVEFORM: PROPAGATION DELAYS
(f=1MHz; 50% duty cycle)
5/8
74ACT280
Plastic DIP-14 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
0.51
1.39
TYP.
MAX.
MIN.
0.020
0.055
MAX.
a1
B
b
1.65
0.065
0.5
0.020
0.010
b1
D
E
e
0.25
20
0.787
8.5
0.335
0.100
0.600
2.54
15.24
e3
F
7.1
5.1
0.280
0.201
I
L
3.3
0.130
Z
1.27
2.54
0.050
0.100
P001A
6/8
74ACT280
SO-14 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.75
0.2
MIN.
MAX.
0.068
0.007
0.064
0.018
0.010
A
a1
a2
b
0.1
0.003
1.65
0.46
0.25
0.35
0.19
0.013
0.007
b1
C
0.5
0.019
c1
D
45 (typ.)
8.55
5.8
8.75
6.2
0.336
0.228
0.344
0.244
E
e
1.27
7.62
0.050
0.300
e3
F
3.8
4.6
0.5
4.0
5.3
0.149
0.181
0.019
0.157
0.208
0.050
0.026
G
L
1.27
0.68
M
S
8 (max.)
P013G
7/8
74ACT280
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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8/8
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