Fairchild Semiconductor 74VCXH245WMX, 74VCXH245WM, 74VCXH245MTCX, 74VCXH245MTC Datasheet
© 1999 Fairchild Semiconductor Corporation ds500198 www.fairchildsemi.com
June 1999
Revised June 1999
74VCXH245 Low Voltage Bidirectional Transceiver with Bushold
74VCXH245
Low Voltage Bidirectional Transceiver with Bushold
General Description
The VCXH245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is inten ded for bus o riented applications. The T/R
input determines th e d irection
of data flow. The OE
input disables both the A and B Ports
by placing them in a high impedanc e state. The VCXH245
data inputs include active bush old circui try, eliminating the
need for external pull-up re sistors to hold unused or floa ting data inputs at a valid logic level.
The 74VCXH245 is designed for low voltage (1.65V to
3.6V) V
CC
applications.
The 74VCXH245 is fabricated with a n advanced CMOS
technology to achieve high-speed operation while maintaining low CMOS power dissipation.
Features
■ 1.65V-3.6V VCC supply operation
■ Bushold on data inputs eliminates the need for external
pull-up/pull-down resistors
■ t
PD
3.5 ns max for 3.0V to 3.6V V
CC
4.2 ns 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
± 6mA @ 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
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending the s uffix let te r “X” to the ordering code.
Logic Symbol Pin Descriptions
Quiet Series is a trademark of Fairchild Semiconductor Corporation.
Order Number Package Number Package Description
74VCXH245WM M20B 20-Lead Small Outline Integrated Circuit, JEDEC MS-013, 0.300” Wide Body
74VCXH245MTC MTC20 20-Lead Thin Shrink Small Outline Package, 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 Bushold Inputs or 3-STAT E Outpu ts
B
0–B7
Side B Bushold Inputs or 3-STAT E Outpu ts
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74VCXH245
Connection Diagram Tr uth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Logic Diagram
Inputs Outputs
OE
T/R
L L Bus B0–B7 Data to Bus A0–A
7
L H Bus A0–A7 Data to Bus B0–B
7
H X HIGH Z State on A0–A7, B0–B7
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74VCXH245
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 3)
Note 1: 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 2: I
O
Absolute Maximum Rating must be observed.
Note 3: Floating or unused control inputs must be held HIG H or LOW.
DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)
Note 4: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 5: An external dri ve r m us t s ink at least the specified cur rent to switch from HIGH -t o-LOW.
Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
I
)
T/R
, OE
−0.5V to +4.6V
I/O Ports −0.5V to V
CC
+ 0.5V
DC Output Voltage (V
O
)(Note 2) −0.5V to VCC + 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
(I
OH/IOL
) ±50 mA
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 V
CC
Output Voltage (VO)0V to V
CC
Output Current in IOH/I
OL
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 VIN = VCC or GND 2.7–3.6 ±5.0 µA
I
I(HOLD)
Bushold Input Minimum VIN = 0.8V 3.0 75
µA
Drive Hold Current VIN = 2.0V 3.0 −75
I
I(OD)
Bushold Input Over-Drive (Note 4) 3.6 450
µA
Current to Change State (Note 5) 3.6 −450
I
OZ
3-STATE Output Leakage VO = VCC or GND 2.7–3.6 ±10
µA
VI = VIH or V
IL
I
CC
Quiescent Supply Current VI = VCC or GND 2.7–3.6 20 µA
∆I
CC
Increase in ICC per Input VIH = VCC −0.6V 2.7–3.6 750 µA
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