Fairchild 74LCX126 service manual
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74LCX126
Low Voltage Quad Buffer
with 5V Tolerant Inputs and Outputs
74LCX126 Low Voltage Quad Buffer with 5V Tolerant Inputs and Outputs
September 2000
Revised July 2003
General Description
The LCX126 conta ins four i ndepend ent non-in verting buffers with 3-STATE outputs. Each output is disabled when
the associated output-enable (OE) input is LOW. The
inputs tolerate voltages up to 7V all owing the interface of
5V systems to 3V systems.
The 74LCX126 is fabricated with an advanced CMOS technology to achieve high s peed operation while maintaining
CMOS low power dissipation.
Features
■ 5V tolerant inputs and outputs
■ 2.3V–3.6V V
■ 5.5 ns t
■ Power down high impedance inputs and outputs
■ Supports live insertion/withdrawal (Note 1)
■
±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
Note 1: To ensure the high-impedance state during power up or down, OE
should be tied to GND through a pull-up resistor: the minimum value or the
resistor is determin ed by the current-sourc ing capability of the driver.
specifications provided
CC
max (VCC = 3.3V), 10 µA ICC max
PD
= 3.0V)
CC
> 2000V
> 100V
Ordering Code:
Order Number Package Number Package Description
74LCX126M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
74LCX126SJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCX126MTC MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Device 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
A
n
OE
n
O
n
© 2003 Fairchild Semiconductor Corporation DS500386 www.fairchildsemi.com
Inputs
Output Enable Inputs
Outputs
H = HIGH Voltage Level Z = High Impedance
L = LOW Voltage Level X = Immaterial
Inputs Output
OE
n
HLL
HHH
LXZ
A
n
O
n
Truth Table
Absolute Maximum Ratings(Note 2)
Symbol Parameter Value Conditions Units
V
CC
74LCX126
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Supply Voltage −0.5 to +7.0 V
DC Input Voltage −0.5 to +7.0 V
DC Output Voltage −0.5 to +7.0 Output in 3-STATE V
−0.5 to V
+ 0.5 Output in HIGH or LOW St ate (Note 3) V
CC
DC Input Diode Current −50 VI < GND mA
DC Output Diode Current −50 VO < GND
+50 V
O
> V
CC
DC Output Source/Sink Current ±50 mA
DC Supply Current per Supply Pin ±100 mA
DC Ground Cu rrent per Ground Pin ±100 mA
Storage Temperature −65 to +150 °C
Recommended Operating Conditions (Note 4)
Symbol Parameter Min Max Units
V
CC
V
I
V
O
I
OH/IOL
T
A
∆t/∆V Input Edge Rate, V
Note 2: 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 Operat ing Conditions” table w ill define the condition s fo r ac t ual device operation.
Note 3: I
Note 4: Unused inputs or I/Os 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
3-STATE 0 5.5
Output Current VCC = 3.0V − 3.6V ±24
= 2.7V − 3.0V ±12
CC
V
= 2.3V − 2.7V ±8
CC
Free-Air Operating Temperature −40 85 °C
= 0.8V–2.0V, VCC = 3.0V 0 10 ns/V
IN
Absolute Maximum Rating must be observed.
O
mA
V
V
mAV
DC Electrical Characteristics
Symbol Parameter Conditions
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
I
OFF
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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 = −100 µA2.3 − 3.6 VCC − 0.2
LOW Level Output Voltage IOL = 100 µA2.3 − 3.6 0.2
Input Leakage Current 0 ≤ VI ≤ 5.5V 2.3 − 3.6 ±5.0 µA
3-STATE Output Leakage 0 ≤ VO ≤ 5.5V
Power-Off Leakage Current VI or VO = 5.5V 0 10 µA
IOH = -8 mA 2.3 1.8
IOH = −12 mA 2.7 2.2
IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2
IOL = 8mA 2.3 0.6
IOL = 12 mA 2.7 0.4
IOL = 16 mA 3.0 0.4
IOL = 24 mA 3.0 0.55
VI = VIH or V
IL
V
2.7 − 3.6 2.0
2.7 − 3.6 0.8
2.3 − 3.6 ±5.0 µA
TA = −40°C to +85°C
CC
(V) Min Max
Units
V
V
V
V
DC Electrical Characteristics (Continued)
V
TA = −40°C to +85°C
Symbol Parameter Conditions
I
CC
∆I
Note 5: Outputs disabled or 3-STATE only.
Quiescent Supply Current VI = VCC or GND 2.3 − 3.6 10
, VO ≤ 5.5V (Note 5) 2.3 − 3.6 ±10
3.6V ≤ V
Increase in ICC per Input VIH = VCC − 0.6V 2.3 − 3.6 500 µA
CC
I
CC
(V) Min Max
AC Electrical Characteristics
TA = −40°C to +85°C, RL = 500Ω
= 3.3V ± 0.3V VCC = 2.7V VCC = 2.5V ± 0.2V
V
Symbol Parameter
CC
C
= 50 pF CL = 50 pF CL = 30 pF
L
Min Max Min Max Min Max
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
OSHL
t
OSLH
Note 6: Skew is defined as t he absolute value of the difference between the actu al propagation delay for any two s eparate outputs of t he same device. T h e
specification applies t o any outputs switchi ng in the same direction, either HIGH-to-LOW (t
Propagation Delay 1.5 5.5 1.5 6.0 1.5 6.6
1.5 5.5 1.5 6.0 1.5 6.6
Output Enable Time 1.5 6.0 1.5 7.0 1.5 7.8
1.5 6.0 1.5 7.0 1.5 7.8
Output Disable Time 1.5 5.5 1.5 6.5 1.5 6.6
1.5 5.5 1.5 6.5 1.5 6.6
Output to Output Skew (Note 6) 1.0
1.0
) or LOW-to-HIGH (t
OSHL
OSLH
).
Dynamic Switching Characteristics
V
TA = 25°C
Symbol Parameter Conditions
V
OLP
V
OLV
Quiet Output Dynamic Peak V
Quiet Output Dynamic Valley V
OL
OL
CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 0.8
C
= 30 pF, VIH = 2.5V, VIL = 0V 2.5 0.6
L
CL = 50 pF, VIH = 3.3V, VIL = 0V 3.3 −0.8
C
= 30 pF, VIH = 2.5V, VIL = 0V 2.5 −0.6
L
CC
(V) Typical
Units
74LCX126
Units
µA
Units
ns
ns
ns
ns
V
V
Capacitance
Symbol Parameter Conditions Typical Units
C
IN
C
OUT
C
PD
Input Capacitance VCC = Open, VI = 0V or V
Output Capacitance VCC = 3.3V, VI = 0V or V
CC
CC
7pF
8pF
Power Dissipation Capacitance VCC = 3.3V, VI = 0V or VCC, f = 10 MHz 25 pF
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