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STMicroelectronics |
74LVQ244
LOW VOLTAGE OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON-INVERTED)
s HIGH SPEED:
tPD = 6 ns (TYP.) at VCC = 3.3V
s COMPATIBLE WITH TTL OUTPUT
s LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA = 25 oC
s LOW NOISE:
VOLP = 0.4V (TYP.) at VCC = 3.3V
s 75Ω TRANSMISSION LINE OUTPUT DRIVE
CAPABILITY
s SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 12 mA (MIN)
s PCI BUS LEVELS GUARANTEED AT 24mA
s BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
s OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 3.6V (1.2VData Retention)
s PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 244
s IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The LVQ244 is a low voltage CMOS OCTAL BUS
BUFFER fabricated with sub-micron silicon gate
and double-layer metal wiring C2MOS
M
(Micro Package)
T
(TSSOP Package)
ORDER CODES :
74LVQ244M
74LVQ244T
technology. It is ideal for low power and low noise
3.3V applications.
It has better speed performance at 3.3V than 5V
LSTTL family combined with the true CMOS low
power consumption.
G output control governs four BUS BUFFERs.
This device is designed to be used with 3 state
memory address drivers, etc.
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
February 1999
1/8
74LVQ244
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCT ION
1 1G Output Enable Input
2, 4,6, 8 1A1 to 1A4 Data Inputs
9, 7,5, 3 2Y1 to 2Y4 Data Outputs
11, 13, 15, 17 2A1 to 2A4 Data Inputs
18, 16, 14, 12 1Y1 to 1Y4 Data Outputs
19 2G Output Enable Input
10 GND Ground (0V)
20 VCC Positive Supply Voltage
TRUTH TABLE
X:”H” or ”L”
Z: High impedance
G
L
L
H
INPUT
An
L
H
X
OUTPUT
Yn
L
H
Z
ABSOLUTE MAXIMUM RATING
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 orIGND DC VCC or Ground Current
± 400
mA
Tstg Storage Temperature
-65 to +150
oC
TL Lead Temperature (10 sec)
300 oC
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
Parameter
VCC Supply Voltage (note 1)
VI Input Voltage
VO Output Voltage
Top Operating Temperature:
dt/dv Input Rise and Fall Time (VCC = 3V) (note 2)
1) Truth Table guaranteed: 1.2V to 3.6V
2) VIN from 0.8V to 2V
Valu e
2 to 3.6
0 to VCC
0 to VCC
-40 to +85
0 to 10
Unit
V
V
V
oC
ns/V
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