Fairchild Semiconductor 74LVX245SJX, 74LVX245SJ, 74LVX245MX, 74LVX245MTC, 74LVX245MSCX Datasheet
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April 1993
Revised March 1999
74LVX245 Low Voltage Octal Bidirectional Transceiver
© 1999 Fairchild Semiconductor Corporation DS011597.prf www.fairchildsemi.com
74LVX245
Low Voltage Octal Bidirectional Transceiver
General Description
The LVX245 contains eight non-invert ing b idire ctional buffers and is intended for bus-oriented applications. The
Transmit/Receive (T/R
) input determines the direction of
data flow through the bidirectional transceiver. Transmit
(active-HIGH) enables data from A Ports to B Ports;
Receive (active-LOW) enables data from B Ports to A
Ports. The Output Enable input, when HIGH, d is able s bo th
A and B Ports by placi ng them in a hig h im pedan ce condition.
Features
■ Ideal for low power/low noise 3.3V applications
■ Guaranteed simultaneous switching noise level and
dynamic threshold performance
Ordering Code
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Logic Symbols
Pin Descriptions
Connection Diagram
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Order Number Package Number Package Description
74LVX245M M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LVX245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LVX245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Description
Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A
0–A7
Side A Inputs or 3-STATE Outputs
B
0–B7
Side B Inputs or 3-STATE Outputs
Inputs Outputs
OE
T/R
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X HIGH-Z State
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74LVX245
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 2)
Note 1: The “Absolute Maximum Ratin gs” are those v alues beyon d which
the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the co ndition s
for actual device operation.
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Noise Characteristics
(Note 3)
Note 3: Input tr = tf = 3 ns
Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
= −0.5V −20 mA
DC Input Voltage T/ R
, OE (VI) −0.5V to 7V
DC Diode Current (I
OK
)
V
O
= −0.5V −20 mA
V
O
= VCC + 0.5V +20 mA
DC Bus I/O Voltage (V
I/O
) −0.5V to VCC + 0.5V
DC Output Source
or Sink Current (I
O
) ±25 mA
DC V
CC
or Ground Current
(I
CC
or I
GND
) ±75 mA
Storage Temperature (T
STG
) −65°C to +150°C
Power Dissipation 180 mW
Supply Voltage (V
CC
) 2.0V to 3.6V
Input Voltage T/R
, OE (VI)0V to 5.5V
Bus I/O Voltage (V
I/O
) 0V to V
CC
Operating Temperature (TA) −40°C to +85°C
Input Rise and Fall Time (∆t/∆V) 0 ns/V to 100 ns/V
Symbol Parameter
V
CC
TA = +25°CT
A
= −40°C to +85°C
Units Conditions
Min Typ Max Min Max
V
IH
HIGH Level 2.0 1.5 1.5
Input 3.0 2.0 2.0 V
Voltage 3.6 2.4 2.4
V
IL
LOW Level 2.0 0.5 0.5
Input 3.0 0.8 0.8 V
Voltage 3.6 0.8 0.8
V
OH
HIGH Level 2.0 1.9 2.0 1.9 VIN = VIH or VILIOH = −50 µA
Output 3.0 2.9 3.0 2.9 V IOH = −50 µA
Voltage 3.0 2.58 2.48 IOH = −4 mA
V
OL
LOW Level 2.0 0.0 0.1 0.1 VIN = VIH or VILIOL = 50 µA
Output 3.0 0.0 0.1 0.1 V IOL = 50 µA
Voltage 3.0 0.36 0.44 IOL = 4 mA
I
OZ
3-STATE 3.6 ±0.25 ±2.5 µAVIN = VIH or V
IL
Output V
OUT
= VCC or GND
Off-State Current
I
IN
Input Leakage Current 3.6 ±0.1 ±1.0 µAVIN = 5.5V or GND
I
CC
Quiescent Supply Current 3.6 4.0 40.0 µAVIN = VCC or GND
Symbol Parameter
V
CC
(V)
TA = 25°C
Units
Conditions
CL (pF)
Typ Limit
V
OLP
Quiet Output Maximum Dynamic V
OL
3.3 0.5 0.8 V 50
V
OLV
Quiet Output Minimum Dynamic V
OL
3.3 −0.5 −0.8 V 50
V
IHD
Minimum HIGH Level Dynamic Input Voltage 3.3 2.0 V 50
V
ILD
Maximum LOW Level Dynamic Input Voltage 3.3 0.8 V 50
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