Motorola MC74LCX2245DW, MC74LCX2245M, MC74LCX2245SD, MC74LCX2245DT Datasheet

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SEMICONDUCTOR TECHNICAL DATA

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The MC74LCX2245 is a high performance, non–inverting octal
transceiver operating from a 2.7 to 3.6V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A VI specification of 5.5V allows MC74LCX2245 inputs to
be safely driven from 5V devices. The MC74LCX2245 is designed to
reduce output overshoot and undershoot and is suitable for memory
address driving and all TTL level bus oriented transceiver applications;
especially those requiring the very quiet outputs.

Current drive capability is 12mA at both A and B ports. The
Transmit/Receive (T/R
through the bi–directional transceiver. Transmit (active–HIGH) enables
data from A ports to B ports; Receive (active–LOW) enables data from B
to A ports. The Output Enable input, when HIGH, disables both A and B
ports by placing them in a HIGH Z condition.

) input determines the direction of data flow



LOW–VOLTAGE CMOS
OCTAL TRANSCEIVER

DW SUFFIX

20–LEAD PLASTIC SOIC

CASE 751D–04

• Designed for 2.7 to 3.6V V

Operation

CC

• 5V Tolerant — Interface Capability With 5V TTL Logic

• Supports Live Insertion and Withdrawal

• I

Specification Guarantees High Impedance When VCC = 0V

OFF

• LVTTL Compatible

• LVCMOS Compatible

• 12mA Balanced Output Sink and Source Capability

• Near Zero Static Supply Current in All Three Logic States (10µA)

Substantially Reduces System Power Requirements

• Latchup Performance Exceeds 500mA

• ESD Performance: Human Body Model >2000V; Machine Model >200V

V

OE

CC

T/R

B0 B1 B2 B3 B4 B5 B6 B7

1920 18 17 16 15 14

21 34567

A0 A1 A2 A3 A4 A5 A6 A7 GND

Figure 1. 20–Lead Pinout

(Top View)

13

12

11

9

8

10

PIN NAMES

Pins

OE
T/R
A0–A7

B0–B7

20–LEAD PLASTIC SOIC EIAJ

M SUFFIX

CASE 967–01

SD SUFFIX

20–LEADPLASTIC SSOP

CASE 940C–03

DT SUFFIX

20–LEAD PLASTIC TSSOP

CASE 948E–02

Function

Output Enable Input
Transmit/Receive Input
Side A 3–State Inputs or 3–State
Outputs
Side B 3–State Inputs or 3–State
Outputs

This document contains information on a product under development. Motorola reserves the right to change or
discontinue this product without notice.

1/97

 Motorola, Inc. 1997

1

REV 0

MC74LCX2245

OPERATING MODE

OE

T/R 1

19

A0

A1

A2

A3

A4

A5

A6

A7

2

18

B0

3

17

B1

4

16

B2

5

15

B3

6

14

B4

7

13

B5

8

12

B6

9

11

B7

Figure 2. Logic Diagram

INPUTS

OE T/R

L L B Data to A Bus
L H A Data to B Bus

H X Z

H = High Voltage Level; L = Low V oltage Level; Z = High Impedance State; X = High or Low Voltage Level
and Transitions are Acceptable; For ICC reasons, Do Not Float Inputs

MOTOROLA LCX DATA

2

Non–Inverting

BR1339 — REV 3

MC74LCX2245

ABSOLUTE MAXIMUM RATINGS*

Symbol Parameter Value Condition Unit

V

CC

V

I

V

O

I

IK

I

OK

I

O

I

CC

I

GND

T

STG

* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions

beyond those indicated may adversely affect device reliability. Functional operation under absolute–maximum–rated conditions is not implied.

1. Output in HIGH or LOW State. IO absolute maximum rating must be observed.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

V

CC

V

I

V

O

I

OH

I

OL

I

OH

I

OL

T

A

∆t/∆V Input Transition Rise or Fall Rate, VIN from 0.8V to 2.0V ,

DC Supply Voltage –0.5 to +7.0 V
DC Input Voltage –0.5 ≤ VI ≤ +7.0 V
DC Output Voltage –0.5 ≤ VO ≤ +7.0 Output in 3–State V

–0.5 ≤ VO ≤ VCC + 0.5 Note 1. V
DC Input Diode Current –50 VI < GND mA
DC Output Diode Current –50 VO < GND mA

+50 VO > V
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 Range –65 to +150 °C

Supply Voltage Operating

Data Retention Only
Input Voltage 0 5.5 V
Output Voltage (HIGH or LOW State)

(3–State)
HIGH Level Output Current, VCC = 3.0V – 3.6V –12 mA
LOW Level Output Current, VCC = 3.0V – 3.6V 12 mA
HIGH Level Output Current, VCC = 2.7V – 3.0V –8 mA
LOW Level Output Current, VCC = 2.7V – 3.0V 8 mA
Operating Free–Air Temperature –40 +85 °C

VCC = 3.0V

2.0

1.5

0
0

0 10 ns/V

3.3

3.3

CC

V

3.6

3.6

CC

5.5

mA

V

V

DC ELECTRICAL CHARACTERISTICS

TA = –40°C to +85°C

Symbol Characteristic Condition Min Max Unit

V

IH

V

IL

V

OH

2. These values of VI are used to test DC electrical characteristics only.

LCX DATA
BR1339 — REV 3

HIGH Level Input Voltage (Note 2.) 2.7V ≤ VCC ≤ 3.6V 2.0 V
LOW Level Input Voltage (Note 2.) 2.7V ≤ VCC ≤ 3.6V 0.8 V
HIGH Level Output Voltage 2.7V ≤ VCC ≤ 3.6V; IOH = –100µA VCC– 0.2 V

VCC = 2.7V; IOH = –4mA 2.2
VCC = 2.7V; IOH = –8mA 2.0
VCC = 3.0V; IOH = –6mA 2.4

VCC = 3.0V; IOH = –12mA 2.0

3 MOTOROLA