Fairchild Semiconductor 74VCXH2245WM, 74VCXH2245MTCX, 74VCXH2245MTC, 74VCXH2245WMX Datasheet

© 1999 Fairchild Semiconductor Corporation ds500199 www.fairchildsemi.com

June 1999
Revised July 1999

74VCXH2245 Low Voltage Bidirectional Transceiver with Bushold

74VCXH2245
Low Voltage Bidirectional Transceiver with Bushold
and 26Ω Series Resistors in B Outputs

General Description

The VCXH2245 contain s eight non-inverting bidirectional
buffers with 3-STATE outputs and is inten ded for bus o ri­ented applications . The T /R

input determines the direction

of data flow. The OE

input disables both the A and B Ports
by placing them in a high impedance state. The VCXH2245
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 74VCXH2245 i s designed for low voltage (1.65V to

3.6V) V

CC

applications. The VCXH2245 is also designed

with 26Ω series resistance in the B Port outputs. This
design reduces line nois e in applicatio ns such as memo ry
address drivers, clock dr ivers, and bus t ransceivers trans­mitters

The 74VCXH2245 is fab ricated 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 control inputs

■ Bushold on data inputs eliminates the need for external

pull-up/pull-down resistors

■ 26Ω series resistors in B Port outputs

■ t

PD

(A to B)

4.4 ns max for 3.0V to 3.6V V

CC

5.6 ns max for 2.3V to 2.7V V

CC

9.8 ns max for 1.65V to 1.95V V

CC

■ Static Drive (IOH/IOL B outputs):
±12 mA @ 3.0V V

CC

±8 mA @ 2.3V V

CC

±3 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

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 Connection Diagram

Quiet Series is a trademark of Fairchild Semiconductor Corporation.

Order Number Package Number Package Description

74VCXH2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74VCXH2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

www.fairchildsemi.com 2

74VCXH2245

Pin Descriptions Tr uth Table

H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance

Logic Diagram

Pin Names Description

OE

Output Enable Input (Active LOW)

T/R

Transmit/Receive Input

A

0–A7

Side A Bushold Inputs or 3-STATE Outputs

B

0–B7

Side B Bushold Inputs or 3-STATE Outputs

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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74VCXH2245

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 Ratings. The “Recom-

mended Operating C onditions” table will def ine the conditions for actual device operation.
Note 2: I

O

Absolute Maximum Rating must be observed.

Note 3: Floating or unu s ed control inputs must b e held HIGH 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 4.6 V

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 ±50 mA
(I

OH/IOL

)

DC V

CC

or Ground Current ±100 mA

Storage Temperature (T

STG

) −65°C to +150°C

Power Supply Voltage (V

CC

)
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/IOL - A Outputs

V

CC

= 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

Output Current in I

OH/IOL

- B Outputs

V

CC

= 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

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

A Outputs IOH = −12 mA 2.7 2.2

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

HIGH Level Output Voltage IOH = −100 µA 2.7–3.6 VCC–0.2

V

B Outputs IOH = −6 mA 2.7 2.2

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

V

OL

LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2

V

A Outputs IOL = 12 mA 2.7 0.4

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

LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2

V

B Outputs IOL = 6 mA 2.7 0.4

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

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 VI = VIH or V

IL

2.7–3.6 ±10 µA

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