Fairchild 74LCX240 service manual
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74LCX240 — Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs
January 2008
74LCX240
Low Voltage Octal Buffer/Line Driver with 5V Tolerant
Inputs and Outputs
Features
5V tolerant inputs and outputs
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2.3V–3.6V V
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6.5ns t
PD
Power-down high impedance inputs and outputs
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Supports live insertion/withdrawal
±24mA output drive (V
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Implements proprietary noise/EMI reduction circuitry
Latch-up performance exceeds 500mA
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ESD performance:
– Human body model > 2000V
– Machine model > 200V
Note:
1. To ensure the high-impedance state during power up
or down, OE
resistor: the minimum value or the resistor is
determined by the current-sourcing capability of the
driver.
specifications provided
CC
max. (V
should be tied to V
3.3V), 10µA I
CC
CC
3.0V)
max.
CC
(1)
through a pull-up
CC
General Description
The LCX240 is an inverting octal buffer and line driver
designed to be employed as a memory address driver,
clock driver and bus oriented transmitter or receiver. The
device is designed for low voltage (2.5V or 3.3V) V
applications with capability of interfacing to a 5V signal
environment.
The LCX240 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation.
Ordering Information
Order
Number
74LCX240WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
74LCX240SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCX240MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm Wide
74LCX240MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
Package
Number Package Description
Wide
CC
All packages are lead free per JEDEC: J-STD-020B standard.
©1994 Fairchild Semiconductor Corporation www.fairchildsemi.com
74LCX240 Rev. 1.6.0
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74LCX240 — Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs
Connection Diagram
Pin Description
Pin Names Description
OE
, OE
1
2
I
–I
0
7
O
–O
0
7
3-STATE Output Enable Inputs
Inputs
Outputs
Logic Diagram
Truth Tables
Inputs Outputs
OE
1
LL H
LH L
HX Z
I
n
(Pins 12, 14, 16, 18)
Inputs Outputs
OE
2
LL H
LH L
HX Z
HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
©1994 Fairchild Semiconductor Corporation www.fairchildsemi.com
74LCX240 Rev. 1.6.0 2
I
n
(Pins 3, 5, 7, 9)
<
<
>
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∆
∆
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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 Parameter Rating
V
CC
V
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Note:
2. I
Absolute Maximum Rating must be observed.
O
Supply Voltage –0.5V to +7.0V
DC Input Voltage –0.5V to +7.0V
I
DC Output Voltage
Output in 3-STATE –0.5V to +7.0V
Output in HIGH or LOW State
DC Input Diode Current, V
GND –50mA
I
(2)
–0.5V to V
DC Output Diode Current
V
V
GND –50mA
O
V
O
CC
DC Output Source/Sink Current ±50mA
DC Supply Current per Supply Pin ±100mA
DC Ground Current per Ground Pin ±100mA
Storage Temperature –65°C to +150°C
CC
+ 0.5V
+50mA
74LCX240 — Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs
Recommended Operating Conditions
(3)
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 Parameter Min. Max. Units
V
CC
V
V
O
I
/
OH
T
A
t
/
Note:
3. Unused inputs must be held HIGH or LOW. They may not float.
Supply Voltage
Operating 2.0 3.6 V
Data Retention 1.5 3.6
Input Voltage 0 5.5 V
I
Output Voltage
3-STATE 0 5.5 V
HIGH or LOW State 0 V
I
Output Current
OL
V
V
V
3.0V–3.6V ±24 mA
CC
2.7V–3.0V ±12
CC
2.3V–2.7V ±8
CC
Free-Air Operating Temperature –40 85 °C
V Input Edge Rate, V
0.8V–2.0V, V
IN
3.0V 0 10 ns
CC
CC
/
V
©1994 Fairchild Semiconductor Corporation www.fairchildsemi.com
74LCX240 Rev. 1.6.0 3
DC Electrical Characteristics
Symbol Parameter V
V
V
V
V
I
OFF
I
CC
∆I
Note:
4. Outputs disabled or 3-STATE only.
HIGH Level Input Voltage 2.3–2.7 1.7 V
IH
LOW Level Input Voltage 2.3–2.7 0.7 V
IL
HIGH Level Output Voltage 2.3–3.6 I
OH
LOW Level Output Voltage 2.3–3.6 I
OL
Input Leakage Current 2.3–3.6 0 ≤ VI ≤ 5.5V ±5.0 µA
I
I
Power-Off Leakage Current VI or VO = 5.5V 10 µA
Quiescent Supply Current 2.3–3.6 VI = VCC or GND 10 µA
Increase in ICC per Input 2.3–3.6 VIH = VCC = 0.6V 500 µA
CC
T
–40°C to +85°C
A
(V) Conditions
CC
2.7–3.6 2.0
2.7–3.6 0.8
2.3 I
2.7 I
3.0 I
2.3 I
2.7 I
3.0 I
–100µA V
OH
–8mA 1.8
OH
–12mA 2.2
OH
–18mA 2.4
OH
I
–24mA 2.2
OH
100µA 0.2 V
OL
8mA 0.6
OL
12mA 0.4
OL
16mA 0.4
OL
I
= 24mA 0.55
OL
3.6V ≤ V
, VO ≤ 5.5V
I
(4)
– 0.2 V
CC
±10
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74LCX240 — Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs
UnitsMin. Max.
AC Electrical Characteristics
TA = –40°C to +85°C, RL = 500Ω
V
= 3.3V ± 0.3V,
CC
CL = 50pF
Symbol Parameter
t
, t
PHL
PLH
, t
t
PZL
PZH
, t
t
PLZ
PHZ
, t
t
OSHL
OSLH
Note:
5. 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-toLOW (t
©1994 Fairchild Semiconductor Corporation www.fairchildsemi.com
74LCX240 Rev. 1.6.0 4
Propagation Delay 1.5 6.5 1.5 7.5 1.5 7.8 ns
Output Enable Time 1.5 8.0 1.5 9.0 1.5 10.0 ns
Output Disable Time 1.5 7.0 1.5 8.0 1.5 8.4 ns
OSLH
(5)
).
Output to Output Skew
) or LOW-to-HIGH (t
OSHL
Min. Max. Min. Max. Min. Max.
1.0 ns
VCC = 2.7V,
CL = 50pF
VCC = 2.5V ± 0.2V,
CL = 30pF
Units
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