Fairchild Semiconductor 74LCX112SJX, 74LCX112SJ, 74LCX112MX, 74LCX112MTCX, 74LCX112MTC Datasheet

June 1998
Revised March 1999

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

© 1999 Fairchild Semiconductor Corporation DS012424.prf www.fairchildsemi.com

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

with 5V Tolerant Inputs

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 indepen dent o f the cl ock 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

CC

specifications provided

■ 7.5 ns t

PD

max (V

CC

= 3.3V), 10 µA ICC max

■ Power down high impedance inputs and outputs

■ ±24 mA output drive (V

CC

= 3.0V)

■ Implements patented noise/EMI reduction circuitry

■ Latch-up performance exceeds 500 mA

■ ESD performance:

Human body model > 2000V

Machine model > 2000V

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending su ffix let te r “X” to the ordering code .

Logic Symbol

IEEE/IEC

Connection Diagram

Pin Descriptions

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

Pin Names Description

J

1

, J2, K1, K

2

Data Inputs

CP

1

, CP

2

Clock Pulse Inputs (Active Falling Edge)

C

D1

, C

D2

Direct Clear Inputs (Active LOW)

S

D1

, S

D2

Direct Set Inputs (Active LOW)

Q

1

, Q2, Q1, Q

2

Outputs

www.fairchildsemi.com 2

74LCX112

Truth Table

(Each half)

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



= HIGH-to-LOW C loc k Transit ion

Q

O(QO

) = Before HIGH-to-LOW Transition of Clock

Lower case letters indicate the state of the ref erenced input or outp ut one setup time prior to the H I GH-to-LOW clock tra ns it ion.

Logic Diagram

Inputs Outputs

S

D

C

D

CP JKQQ

LHXXXHL
HLXXXLH
LLXXXHH
HH



hhQOQ

O

HH



lhLH

HH



hlHL

HH



llQOQ

O

HHHXXQOQ

O

3 www.fairchildsemi.com

74LCX112

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 “Recom­mended Operating C onditions” table will def ine the conditions for act ual device operation.

Note 2: I

O

Absolute Maximum rating must be observed.

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

DC Electrical Characteristics

Symbol Parameter Value Conditions Units

V

CC

Supply Voltage −0.5 to +7.0 V

V

I

DC Input Voltage −0.5 to +7.0 V

V

O

DC Output Voltage −0.5 to V

CC

+ 0.5 Output in H IG H or L OW St at e ( Not e 2 ) V

I

IK

DC Input Diode Current −50 VI < GND mA

I

OK

DC Output Diode Current −50 VO < GND

mA

+50 V

O

> V

CC

I

O

DC Output Source/Sink Current ±50 mA

I

CC

DC Supple Current per Supply Pin ±100 mA

I

GND

DC Ground Current per Ground Pin ±100 mA

T

STG

Storage Temperature −65 to 150 °C

Symbol Parameter Min Max Units

V

CC

Supply Voltage Operating 2.0 3.6

V

Data Retention 1.5 3.6

V

I

Input Voltage 05.5V

V

O

Output Voltage HIGH or LOW State 0 V

CC

V

I

OH/IOL

Output Current VCC = 3.0V − 3.6V ±24

mAV

CC

= 2.7V − 3.0V ±12

V

CC

= 2.3V − 2.7V ±8

T

A

Free-Air Operating Temperature −40 85 °C

∆t/∆V Input Edge Rate, V

IN

= 0.8V−2.0V, VCC = 3.0V 0 10 ns/V

Symbol Parameter Conditions

V

CC

TA = 40°C to +85°C

Units

(V) Min Max

V

IH

HIGH Level Input Voltage 2.3 − 2.7 1.7 V

2.7 − 3.6 2.0

V

IL

LOW Level Input Voltage 2.3 − 2.7 0.7 V

2.7 − 3.6 0.8

V

OH

HIGH Level Output Voltage IOH = −100µA2.3 − 3.6 VCC - 0.2 0.7

IOH = -8 mA 2.3 1.8

V

IOH = −12 mA 2.7 2.2
IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2

V

OL

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

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

I

I

Input Leakage Current 0 ≤ II ≤ 5.5V 2.3 − 3.6 ±5.0 µA

I

OFF

Power-Off Leakage Current VI or VO = 5.5V 0 10 µA

I

CC

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

3.6V ≤ VI ≤ 5.5V 2.3 − 3.6 ±10 µA

∆I

CC

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