Fairchild 74LCX112 service manual

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74LCX112
Low Voltage Dual J-K Negative Edge-Triggered Flip-Flop

with 5V Tolerant Inputs

74LCX112 Low Voltage Dual J-K Negative Edge-Triggered Flip-Flop with 5V Tolerant Inputs

June 1998
Revised February 2001

General Description

The LCX112 is a dual J-K flip-flop. Each flip-flop has inde­pendent J, K, PRESET, CLEAR, and CLOCK inputs with Q,
Q

outputs. These devices are edge sensitive an d change
state on the negative going transition of the clock pulse.
Clear and preset are inde pende nt of th e clock an d accom ­plished by a low logic level on the corresponding input.
LCX devices are designed for low voltage (3.3V or 2.5)
operation with the added capability of interfacing to a 5V
signal environment.

The 74LCX112 is fabricated with advanced CMOS technol­ogy to achieve high speed operation while maintaining
CMOS low power dissipation.

Features

■ 5V tolerant inputs

■ 2.3V–3.6V V

■ 7.5 ns t

■ Power down high impedance inputs and outputs

■

±24 mA output drive (V

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exce eds 500 mA

■ ESD performance:

Human body model

Machine model

specifications provided

CC

max (V

PD

CC

= 3.3V), 10 µA I

= 3.0V)

CC

> 2000V

> 2000V

max

CC

Ordering Code:

Order Number Package Number Package Description

74LCX112M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74LCX112SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCX112MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.

Logic Symbol

IEEE/IEC

Connection Diagram

Pin Descriptions

Pin Names Description

J

, J2, K1, K

1

CP
C

D1

S

D1

Q

1

© 2001 Fairchild Semiconductor Corporation DS012424 www.fairchildsemi.com

, CP

1

2

, C

D2

, S

D2

, Q2, Q1, Q

2

Data Inputs
Clock Pulse Inputs (Active Falling Edge)
Direct Clear Inputs (Active LOW)
Direct Set Inputs (Active LOW)
Outputs

2

Truth Table

(Each half)

74LCX112

S

D

Inputs Outputs

C

CP JKQQ

D

LHXXXHL
HLXXXLH
LLXXXHH

HH
HH
HH

HH









hhQOQ

lhLH

hlHL

llQOQ

HHHXXQOQ

H(h) = HIGH Voltage Level
L(l) = LOW Voltage Level
X = Immaterial



= HIGH-to-LOW C loc k Transit ion

) = Before HIGH-to-LOW Transition of Clock

Q

O(QO

Lower case letters indicate the state of the referenced input or output one setup time prior to the HIGH-to-LOW clock transition.

Logic Diagram

O

O

O

www.fairchildsemi.com 2

Absolute Maximum Ratings(Note 1)

Symbol Parameter Value Conditions Units

V
V
V
I

IK

I

OK

I

O

I

CC

I

GND

T

CC
I
O

STG

Supply Voltage −0.5 to +7.0 V
DC Input Voltage −0.5 to +7.0 V
DC Output Voltage −0.5 to V

+ 0.5 Output in H I GH or L O W St at e ( Not e 2 ) V

CC

DC Input Diode Current −50 VI < GND mA
DC Output Diode Current −50 VO < GND

+50 V

> V

O

CC

mA

DC Output Source/Sink Current ±50 mA
DC Supple 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 the conditions fo r ac t ual device operation.

Note 2: I
Note 3: Unused Inputs must be held HIGH or LOW. They may not float.

Supply Voltage Operating 2.0 3.6

Data Retention 1.5 3.6
Input Voltage 05.5V
Output Voltage HIGH or LOW State 0 V

CC

Output Current VCC = 3.0V − 3.6V ±24

= 2.7V − 3.0V ±12

CC

= 2.3V − 2.7V ±8

V

CC

mAV

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

74LCX112

V

V

DC Electrical Characteristics

Symbol Parameter Conditions

V

V

V

V

I
I
I

∆I

IH

IL

OH

OL

I
OFF
CC

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 = −100µA2.3 − 3.6 VCC - 0.2 0.7

IOH = -8 mA 2.3 1.8
IOH = −12 mA 2.7 2.2
IOH = −18 mA 3.0 2.4

LOW Level Output Voltage IOL = 100µA2.3 − 3.6 0.6

Input Leakage Current 0 ≤ II ≤ 5.5V 2.3 − 3.6 ±5.0 µA
Power-Off Leakage Current VI or VO = 5.5V 0 10 µA
Quiescent Supply Current VI = VCC or GND 2.3 − 3.6 10 µA

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

CC

IOH = −24 mA 3.0 2.2

IOL = 8mA 2.3 0.2
IOL = 12 mA 2.7 0.4 V
IOL = 16 mA 3.0 0.4
IOL = 24 mA 3.0 0.55

3.6V ≤ VI ≤ 5.5V 2.3 − 3.6 ±10 µA

3 www.fairchildsemi.com

V

2.7 − 3.6 2.0

2.7 − 3.6 0.8

TA = 40°C to +85°C

CC

(V) Min Max

Units

V

V

V