ST 74LVQ280 User Manual
74LVQ280
74LVQ280
9 BIT PARITY GENERATOR
■HIGH SPEED:
tPD = 8 ns (TYP.) at VCC = 3.3 V
■COMPATIBLE WITH TTL OUTPUTS
■LOW POWER DISSIPATION: ICC = 2μA(MAX.) at TA=25°C
■LOW NOISE:
VOLP = 0.3V (TYP.) at VCC = 3.3V
■75Ω TRANSMISSION LINE DRIVING CAPABILITY
■SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 12mA (MIN) at VCC = 3.0 V
■PCI BUS LEVELS GUARANTEED AT 24 mA
■BALANCED PROPAGATION DELAYS: tPLH tPHL
■OPERATING VOLTAGE RANGE: VCC(OPR) = 2V to 3.6V
■PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 280
■IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74LVQ280 is a low voltage CMOS 9 BIT PARITY GENERATOR fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power and low noise 3.3V applications.
It is composed of nine data inputs (A to I) and odd/ even parity outputs (ΣODD and ΣEVEN). The nine
SOP |
|
TSSOP |
||
|
|
|
|
|
ORDER CODES |
|
|
|
|
PACKAGE |
|
TUBE |
|
T & R |
|
|
|
|
|
SOP |
|
74LVQ280M |
|
74LVQ280MTR |
|
|
|
|
|
TSSOP |
|
|
|
74LVQ280TTR |
|
|
|
|
|
data inputs control the output conditions. When the number of high level input is odd, ΣODD output is kept high and ΣEVEN output low.
Conversely, when the number of high level is even, ΣEVEN 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.
All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001 |
1/8 |
74LVQ280
INPUT AND OUTPUT EQUIVALENT CIRCUIT |
PIN DESCRIPTION |
|
|
|
PIN No |
SYMBOL |
NAME AND FUNCTION |
|
5 |
ΣEVEN |
Even Parity Output |
|
6 |
ΣODD |
Odd Parity Output |
|
8, 9, 10, 11, |
A to I |
Data Inputs |
|
12, 13, 1, 2, |
|
|
|
4 |
|
|
|
3 |
NC |
No Connection |
|
7 |
GND |
Ground (0V) |
|
14 |
VCC |
Positive Supply Voltage |
TRUTH TABLE
NUMBER OF INPUTS A - I THAT ARE HIGH |
|
OUTPUTS |
|
|
|
|
|
|
ΣEVEN |
|
ΣODD |
|
|
|
|
0, 2, 4, 6, 8 |
H |
|
L |
1, 3, 5, 7, 9 |
L |
|
H |
LOGIC DIAGRAM
2/8 |
|
|
|
74LVQ280 |
|
ABSOLUTE MAXIMUM RATINGS |
|
|
|
|
|
|
|
|
|
Symbol |
Parameter |
Value |
|
Unit |
|
|
|
|
|
VCC |
Supply Voltage |
-0.5 to +7 |
|
V |
VI |
DC Input Voltage |
-0.5 to VCC + 0.5 |
|
V |
VO |
DC Output Voltage |
-0.5 to VCC + 0.5 |
|
V |
IIK |
DC Input Diode Current |
± 20 |
|
mA |
IOK |
DC Output Diode Current |
± 20 |
|
mA |
IO |
DC Output Current |
± 50 |
|
mA |
ICC or IGND |
DC VCC or Ground Current |
± 300 |
|
mA |
Tstg |
Storage Temperature |
-65 to +150 |
|
°C |
TL |
Lead Temperature (10 sec) |
300 |
|
°C |
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied
RECOMMENDED OPERATING CONDITIONS
Symbol |
Parameter |
Value |
Unit |
|
|
|
|
VCC |
Supply Voltage (note 1) |
2 to 3.6 |
V |
VI |
Input Voltage |
0 to VCC |
V |
VO |
Output Voltage |
0 to VCC |
V |
Top |
Operating Temperature |
-55 to 125 |
°C |
1) Truth Table guaranteed: 1.2V to 3.6V
DC SPECIFICATIONS
|
|
|
Test Condition |
|
|
|
Value |
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
Symbol |
Parameter |
VCC |
|
|
TA = 25°C |
-40 to 85°C |
-55 to 125°C |
Unit |
||||
|
|
(V) |
|
|
Min. |
Typ. |
Max. |
Min. |
Max. |
Min. |
Max. |
|
|
|
|
|
|
|
|||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
VIH |
High Level Input |
3.0 to |
|
|
2.0 |
|
|
2.0 |
|
2.0 |
|
V |
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
VIL |
Low Level Input |
3.6 |
|
|
|
|
0.8 |
|
0.8 |
|
0.8 |
V |
|
|
|
|
|
|
|
||||||
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
VOH |
High Level Output |
|
|
IO=-50 μA |
2.9 |
2.99 |
|
2.9 |
|
2.9 |
|
|
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
|
3.0 |
|
IO=-12 mA |
2.58 |
|
|
2.48 |
|
2.48 |
|
V |
|
|
|
|
|
|
|
|
||||||
|
|
|
|
IO=-24 mA |
|
|
|
2.2 |
|
2.2 |
|
|
VOL |
Low Level Output |
|
|
IO=50 μA |
|
0.002 |
0.1 |
|
0.1 |
|
0.1 |
|
|
Voltage |
|
|
|
|
|
|
|
|
|
|
|
|
3.0 |
|
IO=12 mA |
|
0 |
0.36 |
|
0.44 |
|
0.44 |
V |
|
|
|
|
|
|
|
|||||||
|
|
|
|
IO=24 mA |
|
|
|
|
0.55 |
|
0.55 |
|
II |
Input Leakage |
3.6 |
|
VI = VCC or GND |
|
|
± 0.1 |
|
± 1 |
|
± 1 |
μA |
|
Current |
|
|
|
|
|
||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
ICC |
Quiescent Supply |
3.6 |
|
VI = VCC or GND |
|
|
2 |
|
20 |
|
20 |
μA |
|
Current |
|
|
|
|
|
||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
IOLD |
Dynamic Output |
3.6 |
|
VOLD = 0.8 V max |
|
|
|
36 |
|
25 |
|
mA |
IOHD |
Current (note 1, 2) |
|
VOHD = 2 V min |
|
|
|
-25 |
|
-25 |
|
mA |
|
|
|
|
|
|
|
|
||||||
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
3/8
Loading...