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FEATURES
C
ext
3
2
5
8
1
A
V
CC
B
GND
DCT PACKAGE
(TOP VIEW)
YEP OR YZP PACKAGE
(BOTTOM VIEW)
DCU PACKAGE
(TOP VIEW)
3
2
4
5
1
A
V
CC
R
ext
/C
ext
B
GND
B
GND
V
CC
Q
CLR
See mechanical drawings for dimensions.
2
5
3
4
8
CLR
C
ext
Q
CLR
R
ext
/C
ext
Q
4
6
7
6
7
8
6
1
7
A
C
ext
R
ext
/C
ext
DESCRIPTION/ORDERING INFORMATION
SN74LVC1G123
SINGLE RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
WITH SCHMITT-TRIGGER INPUTS
SCES586A JULY 2004 REVISED JUNE 2005
Retriggerable for Very Long Output Pulses, up
to 100% Duty Cycle
Available in the Texas Instruments
NanoStarTM and NanoFreeTM Packages
Overriding Clear Terminates Output Pulse
Supports 5-V V
CC
Operation
Glitch-Free Power-Up Reset on Outputs
Inputs Accept Voltages to 5.5 V
I
off
Supports Partial-Power-Down Mode
Operation
Max t
pd
of 8 ns at 3.3 V
Latch-Up Performance Exceeds 100 mA Per
Supports Mixed-Mode Voltage Operation on
JESD 78, Class II
All Ports
ESD Protection Exceeds JESD 22
Schmitt-Trigger Circuitry on A and B Inputs
for Slow Input Transition Rates
2000-V Human-Body Model (A114-A)
Edge Triggered From Active-High or
200-V Machine Model (A115-A)
Active-Low Gated Logic Inputs
1000-V Charged-Device Model (C101)
The SN74LVC1G123 is a single retriggerable monostable multivibrator designed for 1.65-V to 5.5-V V
CC
operation.
This monostable multivibrator features output pulse-duration control by three methods. In the first method, the A
input is low, and the B input goes high. In the second method, the B input is high, and the A input goes low. In
the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.
ORDERING INFORMATION
T
A
PACKAGE
(1)
ORDERABLE PART NUMBER
TOP-SIDE MARKING
(2)
NanoStarTM WCSP (DSBGA)
SN74LVC1G123YEPR
0.23-mm Large Bump YEP
Reel of 3000
_ _ _ D8_
NanoFreeTM WCSP (DSBGA)
SN74LVC1G123YZPR
0.23-mm Large Bump YZP (Pb-free)
40
C to 85
C
Reel of 3000
SN74LVC1G123DCTR
SSOP DCT
C23_
Reel of 250
SN74LVC1G123DCTT
Reel of 3000
SN74LVC1G123DCUR
VSSOP DCU
C23_
Reel of 250
SN74LVC1G123DCUT
(1)
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
(2)
DCT: The actual top-side marking has three additional characters that designate the year, month, and assembly/test site.
DCU: The actual top-side marking has one additional character that designates the assembly/test site.
YEP/YZP: The actual top-side marking has three preceding characters to denote year, month, and sequence code, and one following
character to designate the assembly/test site. Pin 1 identifier indicates solder-bump composition (1 = SnPb,
= Pb-free).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
NanoStar, NanoFree are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright 20042005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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DECSCRIPTION/ORDERING INFORMATION (CONTINUED)
CLR
C
ext
R
ext
/C
ext
R
B
A
Q
1
2
3
7
6
5
SN74LVC1G123
SINGLE RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
WITH SCHMITT-TRIGGER INPUTS
SCES586A JULY 2004 REVISED JUNE 2005
The output pulse duration is programmed by selecting external resistance and capacitance values. The external
timing capacitor must be connected between C
ext
and R
ext
/C
ext
(positive) and an external resistor connected
between R
ext
/C
ext
and V
CC
. To obtain variable pulse durations, connect an external variable resistance between
R
ext
/C
ext
and V
CC
. The output pulse duration also can be reduced by taking CLR low.
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input
pulse. The A and B inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition rates
with jitter-free triggering at the outputs.
Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or
high-level-active (B) input. Pulse duration can be reduced by taking CLR low. CLR can be used to override A or
B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early clearing.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
NanoStarTM and NanoFreeTM package technology is a major breakthrough in IC packaging concepts, using the
die as the package.
FUNCTION TABLE
INPUTS
OUTPUTS
Q
CLR
A
B
L
X
X
L
X
H
X
L
(1)
X
X
L
L
(1)
H
L
H
H
L
H
(1)
These outputs are based on the
assumption that the indicated
steady-state conditions at the A
and B inputs have been set up
long enough to complete any
pulse started before the setup.
LOGIC DIAGRAM (POSITIVE LOGIC)
2
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V
CC
R
C
C
ext
R
ext
/C
ext
A
B
CLR
Q
t
w
t
w
t
w
+ t
rr
t
rr
R
ext
/C
ext
SN74LVC1G123
SINGLE RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
WITH SCHMITT-TRIGGER INPUTS
SCES586A JULY 2004 REVISED JUNE 2005
REQUIRED TIMING CIRCUIT
INPUT/OUTPUT TIMING DIAGRAM
3
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Absolute Maximum Ratings
(1)
SN74LVC1G123
SINGLE RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
WITH SCHMITT-TRIGGER INPUTS
SCES586A JULY 2004 REVISED JUNE 2005
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
V
CC
Supply voltage range
0.5
6.5
V
V
I
Input voltage range
(2)
0.5
6.5
V
V
O
Voltage range applied to any output in the high-impedance or power-off state
(2)
0.5
6.5
V
V
O
Voltage range applied to any output in the high or low state
(2) (3)
0.5
V
CC
+ 0.5
V
I
IK
Input clamp current
V
I
< 0
50
mA
I
OK
Output clamp current
V
O
< 0
50
mA
I
O
Continuous output current
50
mA
Continuous current through V
CC
or GND
100
mA
DCT package
220
JA
Package thermal impedance
(4)
DCU package
227
C/W
YEP/YZP package
102
T
stg
Storage temperature range
65
150
C
(1)
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2)
The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
(3)
The value of V
CC
is provided in the recommended operating conditions table.
(4)
The package thermal impedance is calculated in accordance with JESD 51-7.
4
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Recommended Operating Conditions
(1)
SN74LVC1G123
SINGLE RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
WITH SCHMITT-TRIGGER INPUTS
SCES586A JULY 2004 REVISED JUNE 2005
MIN
MAX
UNIT
Operating
1.65
5.5
V
CC
Supply voltage
V
Data retention only
1.5
V
CC
= 1.65 V to 1.95 V
0.65 V
CC
V
CC
= 2.3 V to 2.7 V
1.7
V
IH
High-level input voltage
V
V
CC
= 3 V to 3.6 V
2
V
CC
= 4.5 V to 5.5 V
0.7 V
CC
V
CC
= 1.65 V to 1.95 V
0.35 V
CC
V
CC
= 2.3 V to 2.7 V
0.7
V
IL
Low-level input voltage
V
V
CC
= 3 V to 3.6 V
0.8
V
CC
= 4.5 V to 5.5 V
0.3 V
CC
V
I
Input voltage
0
5.5
V
V
O
Output voltage
0
V
CC
V
V
CC
= 1.65 V
4
V
CC
= 2.3 V
8
I
OH
High-level output current
16
mA
V
CC
= 3 V
24
V
CC
= 4.5 V
32
V
CC
= 1.65 V
4
V
CC
= 2.3 V
8
I
OL
Low-level output current
16
mA
V
CC
= 3 V
24
V
CC
= 4.5 V
32
V
CC
= 2 V
5 k
R
ext
(2)
External timing resistance
V
CC
3 V
1 k
T
A
Operating free-air temperature
40
85
C
(1)
All unused inputs of the device must be held at V
CC
or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
(2)
R
ext
/C
ext
is an I/O and must not be connected directly to GND or V
CC
.
5
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