Motorola MC74LCX373DW, MC74LCX373DT, MC74LCX373SD, MC74LCX373M, MC145650 Datasheet

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SEMICONDUCTOR TECHNICAL DATA

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The MC74LCX373 is a high performance, non–inverting octal
transparent latch 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 MC74LCX373 inputs to be
safely driven from 5V devices.

The MC74LCX373 contains 8 D–type latches with 3–state outputs.
When the Latch Enable (LE) input is HIGH, data on the Dn inputs enters
the latches. In this condition, the latches are transparent, i.e., a latch
output will change state each time its D input changes. When LE is LOW,
the latches store the information that was present on the D inputs a setup
time preceding the HIGH–to–LOW transition of LE. The 3–state standard
outputs are controlled by the Output Enable (OE
LOW, the standard outputs are enabled. When OE
outputs are in the high impedance state, but this does not interfere with
new data entering into the latches.

) input. When OE is

is HIGH, the standard



LOW–VOL TAGE

CMOS OCTAL

TRANSPARENT LATCH

DW SUFFIX

20

1

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

• 24mA 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

Pinout: 20–Lead (Top View)

V

O7 D7 D6 O6 O5 D5 D4 O4 LE

CC

1920 18 17 16 15 14

13

12

11

20

1

20

20

PIN NAMES

Pins

OE
LE
D0–D7
O0–O7

M SUFFIX

PLASTIC SOIC EIAJ

CASE 967–01

SD SUFFIX

PLASTIC SSOP

1

1

Function

Output Enable Input
Latch Enable Input
Data Inputs
3–State Latch Outputs

CASE 940C–03

DT SUFFIX

PLASTIC TSSOP

CASE 948E–02

OE

11/96

 Motorola, Inc. 1996

21 34567

O0 D0 D1 O1 O2 D2 D3 O3 GND

1

9

8

10

REV 4

MC74LCX373

OE

LE

D0

LOGIC DIAGRAM

1

11

3

nLE
D

Q

2

O0

D1

D2

D3

D4

D5

D6

D7

13

14

17

18

4

7

8

nLE
D

nLE
D

nLE
D

nLE
D

nLE
D

nLE
D

nLE
D

Q

Q

Q

Q

Q

Q

Q

5

O1

6

O2

9

O3

12

O4

15

O5

16

O6

19

O7

INPUTS OUTPUTS

OE LE Dn On

L
L

L
L

L L X NC Hold; Read Latch
H L X Z Hold; Disabled Outputs
H

H
H

H

H = High Voltage Level; h = High Voltage Level One Setup Time Prior to the Latch Enable High–to–Low Transition;
L = Low Voltage Level; l = Low Voltage Level One Setup Time Prior to the Latch Enable High–to–Low Transition;
NC = No Change, State Prior to the Latch Enable High–to–Low Transition; X = High or Low V oltage Level or Transitions
are Acceptable; Z = High Impedance State; For ICC Reasons DO NOT FLOAT Inputs

MOTOROLA LCX DATA

H
H

L
L

H
H

L
L

H

L
h

l

H

L
h

l

H

L

H

L

Z
Z

Z
Z

2

Transparent (Latch Disabled); Read Latch

Transparent (Latch Disabled); Disabled Outputs

Latched (Latch Enabled); Disabled Outputs

OPERATING MODE

Latched (Latch Enabled) Read Latch

BR1339 — REV 3

MC74LCX373

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 –24 mA
LOW Level Output Current, VCC = 3.0V – 3.6V 24 mA
HIGH Level Output Current, VCC = 2.7V – 3.0V –12 mA
LOW Level Output Current, VCC = 2.7V – 3.0V 12 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

V

OL

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 = –12mA 2.2
VCC = 3.0V; IOH = –18mA 2.4
VCC = 3.0V; IOH = –24mA 2.2

LOW Level Output Voltage 2.7V ≤ VCC ≤ 3.6V; IOL = 100µA 0.2 V

VCC = 2.7V; IOL= 12mA 0.4
VCC = 3.0V; IOL = 16mA 0.4
VCC = 3.0V; IOL = 24mA 0.55

3 MOTOROLA