Fairchild Semiconductor 74VCX2245WMX, 74VCX2245WM, 74VCX2245MTCX, 74VCX2245MTC Datasheet

74VCX2245
Low Voltage Bidirectional Transceiver

with 3.6V Tolerant Inputs and Outputs
and 26Ω Series Resistors in B Outputs

June 1999
Revised June 1999

74VCX2245 Low Voltage Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs and 26Ω Series Resis-

tors in B Outputs

General Description

The VCX2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is inten ded for bus o ri­ented applications . The T/R
of data flow. The OE
by placing them in a high impedance state.

The 74VCX2245 is designed for low voltage (1.65V to

3.6V) V
The VCX2245 is also d esign ed wi th 26 Ω series resistan ce

in the B Port outpu ts. This design reduces line noi se in
applications such as memory address drivers, cl ock driv­ers, and bus transceivers transmitters

The 74VCX2245 is fabricated with an advanced CMOS
technology to achieve high-speed operation while main­taining low CMOS power dissipation.

applications with I/O compatibility up to 3.6V.

CC

input determines the direction

input disables both th e A and B ports

Features

■ 1.65V - 3.6V VCC supply operation

■ 3.6V tolerant inputs and outputs

■ 26Ω series resistors in B Port outputs

■ Power-off high impedance inputs and outputs

■ Supports Live Insertion and Withdrawal (Note 1)

(A to B)

■ t

PD

4.4 ns max for 3.0V to 3.6V V

5.6 ns max for 2.3V to 2.7V V

9.8 ns max for 1.65V to 1.95V V

■ Static Drive (IOH/IOL B outputs):

±12 mA @ 3.0V V
±8 mA @ 2.3V V
±3 mA @ 1.65V V

■ 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 the high impedance state during power up a nd power

should be tied to VCC through a pull up resistor. The minimum

down, OE

n

value of the res istor is dete rmin ed by the curr ent sou rcing ca pabilit y o f the
driver.

CC
CC

CC

CC
CC

CC

Ordering Code:

Order Number Package Number Package Description

74VCX2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74VCX2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.

Logic Symbol Pin Descriptions

Pin Names Description

OE
T/R
A

0–A7

B

0–B7

Quiet Series is a trademark of Fairchild Semiconductor Corporation.

© 1999 Fairchild Semiconductor Corporation ds500170 www.fairchildsemi.com

Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs

Connection Diagram Truth Table

Inputs Outputs

OE

74VCX2245

L L Bus B0–B7 Data to Bus A0–A

L H Bus A0–A7 Data to Bus B0–B
H X HIGH Z State on A0–A7, B0–B7 (Note 2)

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

T/R

7

7

www.fairchildsemi.com 2

Absolute Maximum Ratings(Note 3)

Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
DC Output Voltage (V

) −0.5V to +4.6V

I

)

O

Outputs 3-STATE −0.5V to +4.6V

Outputs Active (Note 4) −0.5V to V
DC Input Diode Current (I
DC Output Diode Current (I

< 0V −50 mA

V

O

> VCC +50 mA

V

O

) VI < 0V −50 mA

IK

)

OK

CC

+ 0.5V

DC Output Source/Sink Current ±50 mA

)

(I

OH/IOL

or Ground Current ±100 mA

DC V

CC

Storage Temperature (T

) −65°C to +150°C

STG

Recommended Operating
Conditions

Power Supply Voltage (V

Operating 1.65V to 3.6V
Data Retention Only 1.2V to 3.6V

(Note 5)

CC

)

Input Voltage −0.3V to 3.6V
Output Voltage (V

Output in Active States 0V to V
Output in 3-STATE 0V to 3.6V

Output Current in I

= 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

V

CC

Output Current in I

= 3.0V to 3.6V ± 12 mA

V

CC

= 2.3V to 2.7V ± 8 mA

V

CC

= 1.65V to 2.3V ± 3 mA

V

CC

Free Air Operating Temperature (T
Minimum Input Edge Rate (∆t/∆V)

= 0.8V to 2.0V, VCC = 3.0V 10 ns/V

V

IN

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.

Absolute Maximum Rating must be observed.

Note 4: I

O

Note 5: Floating or unused inputs m us t be held HIGH or LOW.

DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)

Symbol Parameter Conditions

V

IH

V

IL

V

OH

V

OL

I

I

I

OZ

I

OFF

I

CC

∆I

Note 6: Outputs disab led or 3-STATE only.

HIGH Level Input Voltage 2.7–3.6 2.0 V
LOW Level Input Voltage 2.7–3.6 0.8 V
HIGH Level Output Voltage IOH = −100 µA 2.7–3.6 VCC − 0.2
A Outputs IOH = −12 mA 2.7 2.2

HIGH Level Output Voltage IOH = −100 µA 2.7–3.6 VCC–0.2
B Outputs IOH = −6 mA 2.7 2.2

LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2
A Outputs IOL = 12 mA 2.7 0.4

LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2
B Outputs IOL = 6 mA 2.7 0.4

Input Leakage Current 0 ≤ VI ≤ 3.6V 2.7–3.6 ±5.0 µA
3-STATE Output Leakage 0 ≤ VO ≤ 3.6V

Power Off Leakage Current 0 ≤ (VI, VO) ≤ 5.5V 0 10 µA
Quiescent Supply Current VI = VCC or GND 2.7–3.6 20

Increase in ICC per Input VIH = VCC −0.6V 2.7–3.6 750 µA

CC

IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2

IOH = −8 mA 3.0 2.4
IOH = −12 mA 3.0 2.2

IOL = 18 mA 3.0 0.4
IOL = 24 mA 3.0 0.55

IOL = 8 mA 3.0 0.55
IOL = 12 mA 3.0 0.8

VI = VIH or V

VCC ≤ (VI, VO) ≤ 3.6V (Note 6) 2.7–3.6 ±20

IL

)

O

- A Outputs

OH/IOL

- B Outputs

OH/IOL

) −40°C to +85°C

A

V

CC

(V)

2.7–3.6 ±10 µA

Min M ax Units

74VCX2245

CC

V

V

V

V

µA

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