Fairchild Semiconductor 74VCX16245MTDX, 74VCX16245MTD, 74VCX16245CW, 74ALVC16245MTDX, 74ALVC16245MTD Datasheet

October 1996
Revised April 1999

74VCX16245 Low Voltage 16-Bit Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs

© 1999 Fairchild Semiconductor Corporation DS012169.prf www.fairchildsemi.com

74VCX16245
Low Voltage 16-Bit Bidirectional Transceiver with

3.6V Tolerant Inputs and Outputs

General Description

The VCX16245 contain s si xte en no n-in ver ting bidirectional
buffers with 3-STATE outputs and is inten ded for bus o ri­ented applications. The device is byte controlled. Each
byte has separate 3-STATE control inputs which can be
shorted together for full 16-b it operation. The T/R

inputs
determine the dire ction of data flow through the device.
The OE

inputs disable both the A and B po rts by placing

them in a high impedance state.
The 74VCX16245 is designed for low voltage (1.65 to

3.6V) V

CC

applications with I/O compatibility up to 3.6V.

The 74VCX16245 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

■ t

PD

2.5 ns max for 3.0V to 3.6V V

CC

3.0 ns max for 2.3V to 2.7V V

CC

6.0 ns max for 1.65V to 1.95V V

CC

■ Power-down high impedance inputs and outputs

■ Supports live insertion/withdrawal (Note 1)

■ Static Drive (I

OH/IOL

)

±24 mA @ 3.0V V

CC

±18 mA @ 2.3V V

CC

±6 mA @ 1.65V V

CC

■ Uses patented 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 d uring power up or power
down, OE

should be tied to VCC through a pull-up r esistor; the min imum
value of the res istor is d eter mine d by the cu rre nt-sou rcin g ca pa bility of t he
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

Order Number Package Number Package Description

74VCX16245MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

www.fairchildsemi.com 2

74VCX16245

Connection Diagram Pin Descriptions

Tr uth Tables

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial (HIGH or LOW, inputs and I/O’s may not float)
Z = High Impedance

Logic Diagram

Pin Description

Names

OE

n

Output Enable Input (Active LOW)

T/R

n

Transmit/Receive Input

A

0–A15

Side A Inputs or 3-STATE Outputs

B

0–B15

Side B Inputs or 3-STATE Outputs

Inputs Outputs

OE

1

T/R

1

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–B

7

Inputs Outputs

OE

2

T/R

2

L L Bus B8–B15 Data to Bus A8–A

15

L H Bus A8–A15 Data to Bus B8–B

15

H X HIGH Z State on A8–A15, B8–B

15

3 www.fairchildsemi.com

74VCX16245

Absolute Maximum Ratings(Note 2) Recommended Operating

Conditions

(Note 4)

Note 2: The “Absolute Maximum Ratings ” are those val ues beyond w hich
the safety of the device cannot be guaranteed. The device should not be
operated at thes e limits. The paramet ric values defined in the “Electrical
Characteristics” t able are not guar anteed at the Abso lute Maximum Ra t­ings. The Recommended Operating Conditions tables will d ef ine the condi­tions for actual device operation.

Note 3: I

O

Absolute Maximum Rating must be observed.

Note 4: Floating or unused pin (inputs or I/O's) must be held HIGH or LOW.

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

Note 5: 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

Output Voltage (V

O

)
Outputs 3-STATE −0.5V to +4.6V
Outputs Active (Note 3) −0.5 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

> V

CC

+50 mA

DC Output Source/Sink Current

(I

OH/IOL

) ±50 mA

DC V

CC

or Ground Current per

Supply Pin (I

CC

or Ground) ±100 mA

Storage Temperature Range (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 0.0V 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

Min Max Units

(V)

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

IOH = −12 mA 2.7 2.2 V
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

IOL = 12 mA 2.7 0.4 V
IOL = 18 mA 3.0 0.4
IOL = 24 mA 3.0 0.55

I

I

Input Leakage Current 0V ≤ VI ≤ 3.6V 2.7–3.6 ±5.0 µA

I

OZ

3-STATE Output Leakage 0V ≤ VO ≤ 3.6V 2.7–3.6 ±10 µA

VI = VIH or V

IL

I

OFF

Power Off Leakage Current 0V ≤ (VI, VO) ≤ 3.6V 0 10 µA

I

CC

Quiescent Supply Current VI = VCC or GND 2.7–3.6 20

µA

VCC ≤ (VI, VO) ≤ 3.6V (Note 5) 2.7–3.6 ±20

∆I

CC

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