Fairchild Semiconductor 74LCXH2245 Datasheet

October 2000
Revised September 2001

74LCXH2245
Low Voltage Bidirectional Transceiver with Bushold

and 26

Ω Series Resistors in B Outputs

74LCXH2245 Low Voltage Bidirectional Transceiver with Bushold and 26

General Description

The LCXH2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is in tended for bus ori­ented applications. The device is designed fo r low voltage
(2.5V and 3.3V) V

mines the direction of data flow through the device. The OE
input disables both the A and B ports by placin g them in a
high impedance state. The 26
output helps reduce output overshoot and undershoot.

The LCXH2245 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain­ing CMOS low power dissipation.

The LCXH2245 data inputs include active bushold circuitry,
eliminating the need fo r external pull-up resistors to hold
unused or floating data inputs at a valid logic level.

applications. The T/R input deter-

CC

Ω series resistor in the B Port

Features

■ 5V tolerant control inputs

■ 2.3V–3.6V V

■ Bushold on inputs eliminates the need for external

pull-up/pull-down resistors

■ 7.0 ns t

■ Power down high impedance outputs

■

±12 mA output drive B Port (V

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exce eds 500 mA

■ Equivalent 26

■ ESD performance:

Human body model
Machine model

specifications provided

CC

max (V

PD

= 3.3V), 10 µA I

CC

CC

Ω series resistor on B Port outputs

> 2000V

> 200V

CC

= 3.0V)

max

Ordering Code:

Order Number Package Number Package Description

74LCXH2245WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCXH2245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCXH2245MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCXH2245MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

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

Logic Symbol

Connection Diagram

Ω

Series Resistors in B Outputs

Pin Descriptions

Pin Names Description

OE
T/R
A

0–A7

B

0–B7

GTO is a trademark of Fa irc hild Semiconduct or C orporation.

© 2001 Fairchild Semiconductor Corporation DS500409 www.fairchildsemi.com

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

Truth Table

74LCXH2245

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

Logic Diagram

Inputs

OE

T/R

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

Outputs

7

7

www.fairchildsemi.com 2

Absolute Maximum Ratings(Note 1)

Symbol Parameter Value Conditions Units

V
V

V
I
I

I
I
I
T

CC
I

O
IK
OK

O
CC
GND

STG

Supply Voltage −0.5 to +7.0 V
T/R, OE, −0.5 to +7.0

I/O Ports

−0.5 to V

+0.5

CC

DC Output Voltage −0.5 to VCC + 0.5 Output in HIGH or LOW State (Note 2) V
DC Input Diode Current −50 VI < GND mA
DC Output Diode Current −50 VO < GND

+50 V

O

> V

CC

DC Output Source/Sink Current ±50 mA
DC Supply Current per Supply Pin ±100 mA
DC Ground Current per Ground Pin ±100 mA
Storage Temperature −65 to +150 °C

Recommended Operating Conditions (Note 3)

Symbol Parameter Min Max Units

V

CC

V

I

V

O

I

OH/IOL

T

A

∆t/∆V Input Edge Rate, V

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 Conditions” table will define th e c onditions for actual dev ic e operation.

Note 2: I
Note 3: Floati ng or unused control inputs must be HIGH or LOW.

Supply Voltage Operating 2.0 3.6

Data Retention 1.5 3.6
Input Voltage 0VCCV
Output Voltage HIGH or LOW State 0 V

CC

3-STATE 0 5.5

Output Current in IOH/IOL - A Outputs VCC = 3.0V − 3.6V ±24

= 2.7V - 3.0V ±12

CC

= 2.3V - 2.7V ± 8

V

Output Current in I

- B Outputs VCC = 3.0V − 3.6V ±12

OH/IOL

CC

= 2.7V - 3.0V ± 8

CC

= 2.3V - 2.7V ± 4

V

CC

Free-Air Operating T emperature −40 85 °C

= 0.8V − 2.0V, VCC = 3.0V 0 10 ns/V

IN

Absolute Maximum Rating must be observed.

O

mAV

mAV

74LCXH2245

V

mA

V

V

DC Electrical Characteristics

Symbol Parameter Conditions

V

IH

V

IL

V

OH

V

OH

HIGH Level Input Voltage 2.3 − 2.7 1.7

LOW Level Input Voltage 2.3 − 2.7 0.7

HIGH Level Output Voltage IOH = −100 µA 2.3 - 3.6 VCC − 0.2
A Outputs IOH = −8 mA 2.3 1.8

IOH = −12 mA 2.7 2.2
IOH = −16 mA 3.0 2.4

IOH = −24 mA 3.0 2.2
HIGH Level Output Voltage IOH = −100 µA 2.3 - 3.6 VCC − 0.2
B Outputs IOH = −4 mA 2.3 1.8

IOH = −4 mA 2.7 2.2

IOH = −6 mA 3.0 2.4

IOH = −8 mA 2.7 2.0

IOH = −12 mA 3.0 2.0

V

CC

(V) Min Max

2.7 − 3.6 2.0

2.7 - 3.6 0.8

TA = −40°C to +85°C

Units

V

V

V

V

3 www.fairchildsemi.com

DC Electrical Characteristics (Continued)

Symbol Parameter Conditions

V

OL

74LCXH2245

LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2
A Outputs I

= 8 mA 2.3 0.6

OL

I

= 12 mA 2.7 0.4

OL

IOL = 16 mA 3.0 0.4

= 24 mA 3.0 0.55

I

V

OL

LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2

OL

B Outputs IOL = 4 mA 2.3 0.6

= 4 mA 2.7 0.4

I

OL

I

= 6 mA 3.0 0.55

OL

IOL = 8 mA 2.7 0.6

= 12 mA 3.0 0.8

I

I

I

I

I(HOLD)

Input Leakage Current VI = VCC or GND 2.3 − 3.6 ±5.0 µA
Bushold Input Minimum VIN = 0.7V

OL

Drive Hold Current VIN = 1.7V −45

VIN = 0.8V
VIN = 2.0V −75

I

I(OD)

Bushold Input Over-Drive (Note 5)
Current to Change State (Note 6) −300

(Note 5)
(Note 6) −450

I

OZ

I

CC

3-STATE I/O Leakage VO = VCC or GND

VI = VIH or V

IL

Quiescent Supply Current VI = VCC or GND 2.3 − 3.6 10

3.6V ≤ VI, VO ≤ 5.5V (Note 4) 2.3 − 3.6 ±10

∆I

CC

Note 4: Outputs disabled or 3- STATE only.
Note 5: An external driver must source at least the specified current to switch from LOW-to-HIGH.
Note 6: An external driver must s ink at least the specified current to switch from HI GH-to-LOW.

Increase in ICC per Input VIH = VCC −0.6V 2.3 - 3.6 500 µA

V

CC

(V) Min Max

2.3

3.0

2.7

3.6

TA = −40°C to +85°C

45

75

300

450

Units

2.3 − 3.6 ±5.0 µA

V

V

µA

µA

µA

AC Electrical Characteristics

TA = −40°C to +85°C, RL = 500Ω

V

= 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V

Symbol Parameter

t

PHL

t

PLH

t

PHL

t

PLH

t

PZL

t

PZH

t

PZL

t

PZH

t

PLZ

t

PHZ

t

PLZ

t

PHZ

t

OSHL

t

OSLH

Note 7: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs sw it c hing in the same direction, either HIGH-to-LOW (t

Propagation Delay
A to B
Propagation Delay
B to A
Output Enable Time
A to B
Output Enable Time
B to A
Output Disable Time
A to B
Output Disable Time
B to A
Output to Output Skew
(Note 7)

www.fairchildsemi.com 4

CC

= 50 pF CL = 50 pF CL = 30 pF

C

L

Min Max Min Max Min Max

1.58.01.59.01.59.6ns

1.57.01.58.01.58.4ns

1.5 9.5 1.5 10.5 1.5 11.0 ns

1.58.51.59.51.510.5ns

1.57.51.58.51.59.0ns

1.57.51.58.51.59.0ns

1.0 ns

) or LOW-to-HIGH (t

OSHL

OSLH

).

Units