74LCX244 — Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs
February 2009
74LCX244
Low Voltage Buffer/Line Driver with 5V Tolerant
Inputs and Outputs
Features
■
5V tolerant inputs and outputs
■
2.3V to 3.6V V
CC
specifications provided
■
6.5ns t
PD
max. (V
CC
=
3.3V), 10µA I
CC
max.
■
Power down high impedance inputs and outputs
■
Supports live insertion/withdrawal
(1)
■
±24mA output drive (V
CC
=
3.0V)
■
Implements patented noise/EMI reduction circuitry
■
Latch-up performance exceeds 500mA
■
ESD performance:
General Description
The LCX244 contains eight non-inverting buffers with
3-STATE outputs. The device may be employed as a
memory address driver, clock driver and bus-oriented
transmitter/receiver. The LCX244 is designed for low
voltage (2.5V or 3.3V) V
CC
applications with capability of
interfacing to a 5V signal environment.
The LCX244 is fabricated with an advanced CMOS tech-
nology to achieve high speed operation while maintain-
ing CMOS low power dissipation.
– Human body model
>
2000V
– Machine model
>
200V
■
Leadless DQFN package
Note:
1. To ensure the high-impedance state during power up
or down, OE should be tied to V
CC
through a pull-up
resistor: the minimum value or the resistor is
determined by the current-sourcing capability of the
driver.
Ordering Information
Order Number
74LCX244WM
74LCX244SJ
74LCX244BQX
(2)
74LCX244MSA
74LCX244MTC
Package
Number
M20B
M20D
MLP20B
MSA20
MTC20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Terminal Depopulated Quad Very-Thin Flat Pack No Leads (DQFN),
JEDEC MO-241, 2.5 x 4.5mm
20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
Note:
2. DQFN package available in Tape and Reel only.
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
All packages are lead free per JEDEC: J-STD-020B standard.
©1994 Fairchild Semiconductor Corporation
74LCX244 Rev. 1.12.1
www.fairchildsemi.com
74LCX244 — Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs
Connection Diagram
Pin Assignments for SOIC, SOP, SSOP, and TSSOP
Logic Diagram
Pad Assignments for DQFN
Truth Tables
Inputs
OE
1
L
L
H
Outputs
I
n
L
H
X
(Pins 12, 14, 16, 18)
L
H
Z
Inputs
OE
2
L
L
(Top Through View)
H
Outputs
I
n
L
H
X
(Pins 3, 5, 7, 9)
L
H
Z
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Pin Description
Pin Names
OE
1
, OE
2
I
0
–I
7
O
0
–O
7
Inputs
Outputs
Description
3-STATE Output Enable Inputs
Z
=
High Impedance
©1994 Fairchild Semiconductor Corporation
74LCX244 Rev. 1.12.1
www.fairchildsemi.com
2
74LCX244 — Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
V
CC
V
I
V
O
Supply Voltage
DC Input Voltage
DC Output Voltage
Output in 3-STATE
Parameter
Rating
–0.5V to +7.0V
–0.5V to +7.0V
–0.5V to +7.0V
–0.5V to V
CC
+ 0.5V
–50mA
–50mA
+50mA
±50mA
±100mA
±100mA
–65°C to +150°C
Output in HIGH or LOW State
(3)
I
IK
I
OK
DC Input Diode Current, V
I
<
GND
DC Output Diode Current
V
O
<
GND
V
O
>
V
CC
I
O
I
CC
I
GND
T
STG
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Note:
3. I
O
Absolute Maximum Rating must be observed.
Recommended Operating Conditions
(4)
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
V
CC
Supply Voltage
Operating
Data Retention
V
I
V
O
Input Voltage
Output Voltage
3-STATE
HIGH or LOW State
I
OH
/ I
OL
Output Current
V
CC
=
3.0V–3.6V
V
CC
=
2.7V–3.0V
V
CC
=
2.3V–2.7V
T
A
Δt
/
ΔV
Parameter
Min.
2.0
1.5
0
0
0
Max.
3.6
3.6
5.5
5.5
V
CC
±24
±12
±8
Units
V
V
V
mA
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V–2.0V, V
CC
=
3.0V
–40
0
85
10
°C
ns / V
Note:
4. Unused inputs must be held HIGH or LOW. They may not float.
©1994 Fairchild Semiconductor Corporation
74LCX244 Rev. 1.12.1
www.fairchildsemi.com
3
74LCX244 — Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs
DC Electrical Characteristics
T
A
=
–40°C to +85°C
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
V
CC
(V)
2.3–2.7
2.7–3.6
2.3–2.7
2.7–3.6
2.3–3.6
2.3
2.7
3.0
Conditions
Min.
1.7
2.0
Max.
Units
V
0.7
0.8
I
OH
=
–100µA
I
OH
=
–8mA
I
OH
=
–12mA
I
OH
=
–18mA
I
OH
=
–24mA
I
OL
=
100µA
I
OL
=
8mA
I
OL
=
12mA
I
OL
=
16mA
I
OL
=
24mA
0
≤
V
I
≤
5.5V
0
≤
V
O
≤
5.5V,
V
I
= V
IH
or V
IL
V
I
or V
O
=
5.5V
V
I
=
V
CC
or GND
3.6V
≤
V
I
, V
O
≤
5.5V
(5)
V
IH
=
V
CC
– 0.6V
V
CC
– 0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
±5.0
10
10
±10
500
V
V
V
OL
LOW Level Output Voltage
2.3–3.6
2.3
2.7
3.0
V
I
I
I
OZ
I
OFF
I
CC
ΔI
CC
Input Leakage Current
3-STATE Output Leakage
Power-Off Leakage Current
Quiescent Supply Current
Increase in I
CC
per Input
2.3–3.6
2.3–3.6
0
2.3–3.6
2.3–3.6
µA
µA
µA
µA
µA
Note:
5. Outputs disabled or 3-STATE only.
AC Electrical Characteristics
T
A
=
–40°C to +85°C, R
L
=
500Ω
V
CC
=
3.3V ± 0.3V,
C
L
=
50pF
Symbol
t
PHL
, t
PLH
t
PZL
, t
PZH
t
PLZ
, t
PHZ
t
OSHL
, t
OSLH
V
CC
=
2.7V,
C
L
=
50pF
Min.
1.5
1.5
1.5
V
CC
=
2.5V ± 0.2V,
C
L
=
30pF
Min.
1.5
1.5
1.5
Parameter
Propagation Delay,
Data to Output
Output Enable Time
Output Disable Time
Output to Output Skew
(6)
Min.
1.5
1.5
1.5
Max.
6.5
8.0
7.0
1.0
Max.
7.5
9.0
8.0
Max.
7.8
10.0
8.4
Units
ns
ns
ns
ns
Note:
6. 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 switching in the same direction, either HIGH-to-
LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
©1994 Fairchild Semiconductor Corporation
74LCX244 Rev. 1.12.1
www.fairchildsemi.com
4
74LCX244 — Low Voltage Buffer/Line Driver with 5V Tolerant Inputs and Outputs
Dynamic Switching Characteristics
T
A
=
25°C
Symbol
V
OLP
V
OLV
Parameter
Quiet Output Dynamic Peak V
OL
Quiet Output Dynamic Valley V
OL
V
CC
(V)
3.3
2.5
3.3
2.5
Conditions
C
L
=
50pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30pF, V
IH
=
2.5V, V
IL
=
0V
C
L
=
50pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30pF, V
IH
=
2.5V, V
IL
=
0V
Typical
0.8
0.6
–0.8
–0.6
Unit
V
V
Capacitance
Symbol
C
IN
C
OUT
C
PD
Parameter
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Conditions
V
CC
=
Open, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10MHz
Typical
7.0
8.0
25.0
Units
pF
pF
pF
©1994 Fairchild Semiconductor Corporation
74LCX244 Rev. 1.12.1
www.fairchildsemi.com
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
