Fairchild Semiconductor 74VCX245MTCX, 74VCX245MTC, 74VCX245WMX, 74VCX245WM Datasheet
© 1999 Fairchild Semiconductor Corporation ds500167 www.fairchildsemi.com
June 1999
Revised July 1999
74VCX245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs
74VCX245
Low Voltage Bidirectional Transceiver
with 3.6V Tolerant Inputs and Outputs
General Description
The VCX245 contains eight non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus ori ented
applications. The T/R
input determines the direction of data
flow. The OE
input disables both the A and B ports by plac-
ing them in a high impedance state.
The 74VCX245 is de sign ed for low voltage (1.65V to 3.6V)
V
CC
applications with I/O compatibility up to 3.6V.
The 74VCX245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while maintaining low CMOS power dissipation.
Features
■ 1.65V-3.6V VCC supply operation
■ 3.6V tolerant inputs and outputs
■ Power-off high impedance inputs and outputs
■ Supports Live Insertion and Withdrawal (Note 1)
■ t
PD
3.5 ns max for 3.0V to 3.6V V
CC
4.2 nx max for 2.3V to 2.7V V
CC
8.4 ns max for 1.65V to 1.95V V
CC
■ Static Drive (IOH/IOL)
±24 mA @ 3.0V V
CC
±18 mA @ 2.3V V
CC
±6 mA @ 1.65V V
CC
■ Uses patented Quiet Series noise/EMI reduction
circuitry
■ Latchup performance exceeds 300 mA
■ ESD performance:
Human body model > 2000V
Machine model > 200V
Note 1: To ensure th e high impe dance state d uring power up and p ower
down, OE
n
should be tied to VCC through a pull up resistor. The minimum
value of the res istor is dete rmin ed by the curr ent sou rcing ca pabilit y o f the
driver.
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 Symbol Pin Descriptions
Quiet Series is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74VCX245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74VCX245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Pin Names Description
OE
Output Enable Input (Active LOW)
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
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74VCX245
Connection Diagram Tr uth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Note 2: Unused bus terminals during HI GH Z State m ust be held H IGH or
LOW.
Logic Diagram
Inputs Outputs
OE
T/R
LLBus B0–B7 Data to Bus A0–A
7
LHBus A0–A7 Data to Bus B0–B
7
H X HIGH Z State on A0–A7, B0–B7 (Note 2)
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74VCX245
Absolute Maximum Ratings(Note 3) Recommended Operating
Conditions
(Note 5)
Note 3: The Absolute Maximum Ratings are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the Absolute Maximum Rat-
ings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Note 4: I
O
Absolute Maximum Rating must be observed.
Note 5: Floating or unused inputs m us t be held HIGH or LOW.
DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)
Note 6: Outputs disab led or 3-STATE only.
Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
I
) −0.5V to +4.6V
DC Output Voltage (V
O
)
Outputs 3-STATE −0.5V to +4.6V
Outputs Active (Note 4) −0.5V to V
CC
+ 0.5V
DC Input Diode Current (I
IK
) VI < 0V −50 mA
DC Output Diode Current (I
OK
)
V
O
< 0V −50 mA
V
O
> VCC +50 mA
DC Output Source/Sink Current ±50 mA
(I
OH/IOL
)
DC V
CC
or Ground Current ±100 mA
Storage Temperature (T
STG
) −65°C to +150°C
Power Supply
Operating 1.65V to 3.6V
Data Retention Only 1.2V to 3.6V
Input Voltage −0.3V to 3.6V
Output Voltage (V
O
)
Output in Active States 0V to V
CC
Output in 3-STATE 0V to 3.6V
Output Current in I
OH/IOL
VCC = 3.0V to 3.6V ±24 mA
V
CC
= 2.3V to 2.7V ±18 mA
V
CC
= 1.65V to 2.3V ±6 mA
Free Air Operating Temperature (T
A
) −40°C to +85°C
Minimum Input Edge Rate (∆t/∆V)
V
IN
= 0.8V to 2.0V, VCC = 3.0V 10 ns/V
Symbol Parameter Conditions
V
CC
(V)
Min Max Units
V
IH
HIGH Level Input Voltage 2.7–3.6 2.0 V
V
IL
LOW Level Input Voltage 2.7–3.6 0.8 V
V
OH
HIGH Level Output Voltage IOH = −100 µA 2.7–3.6 VCC − 0.2
V
IOH = −12 mA 2.7 2.2
IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2
V
OL
LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2
V
IOL = 12 mA 2.7 0.4
IOL = 18 mA 3.0 0.4
IOL = 24 mA 3.0 0.55
I
I
Input Leakage Current 0 ≤ VI ≤ 3.6V 2.7–3.6 ±5.0 µA
I
OZ
3-STATE Output Leakage 0 ≤ VO ≤ 3.6V
2.7–3.6 ±10 µA
VI = VIH or V
IL
I
OFF
Power Off Leakage Current 0 ≤ (VI, VO) ≤ 5.5V 0 10 µA
I
CC
Quiescent Supply Current VI = VCC or GND 2.7–3.6 20
µA
VCC ≤ (VI, VO) ≤ 3.6V (Note 6) 2.7–3.6 ±20
∆I
CC
Increase in ICC per Input VIH = VCC −0.6V 2.7–3.6 750 µA
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