74vhc123a Fairchild Semiconductor, 74vhc123a Datasheet

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74vhc123a

Manufacturer Part Number
74vhc123a
Description
Dual Retriggerable Monostable Multivibrator
Manufacturer
Fairchild Semiconductor
Datasheet

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©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
74VHC123A
Dual Retriggerable Monostable Multivibrator
Features
I
I
I
I
I
I
Ordering Information
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the
ordering number.
74VHC123AM
74VHC123ASJ
74VHC123AMTC
Order Number
High Speed: t
Low Power Dissipation: I
Active State: I
High Noise Immunity: V
Power down protection is provided on all inputs
Pin and function compatible with 74HC123A
PD
CC
= 8.1ns (Typ.) at T
= 600µA (Max.) at T
Package
Number
MTC16
M16A
M16D
NIH
CC
= V
= 4µA (Max) at T
NIL
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
= 28% V
A
= 25°C
A
= 25°C
CC
A
(Min.)
= 25°C
General Description
The VHC123A is an advanced high speed CMOS
Monostable Multivibrator fabricated with silicon gate
CMOS technology. It achieves the high speed operation
similar to equivalent Bipolar Schottky TTL while main-
taining the CMOS low power dissipation. Each multi-
vibrator features both a negative, A, and a positive, B,
transition triggered input, either of which can be used as
an inhibit input. Also included is a clear input that when
taken low resets the one-shot. The VHC123A can be
triggered on the positive transition of the clear while A is
held low and B is held high. The output pulse width is
is in seconds, R is in ohms, and C is in farads.
Limits for R
External capacitor, C
External resistors, R
An input protection circuit ensures that 0 to 7V can be
applied to the input pins without regard to the supply
voltage. This device can be used to interface 5V to 3V
systems and two supply systems such as battery back
up. This circuit prevents device destruction due to mis-
matched supply and input voltages.
determined by the equation: PW = (R
Package Description
x
and C
x
x
x
: V
: No limit
are:
V
CC
CC
= 2.0V, 5 kΩ min
> 3.0V, 1 kΩ min
x
)(C
x
www.fairchildsemi.com
); where PW
May 2007
tm

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74vhc123a Summary of contents

Page 1

... MTC16 Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 General Description = 25°C The VHC123A is an advanced high speed CMOS A Monostable Multivibrator fabricated with silicon gate = 25° ...

Page 2

... Pin Description Pin Names Description A Trigger Inputs (Negative Edge) B Trigger Inputs (Positive Edge) CLR Reset Inputs C External Capacitor x R External Resistor Outputs ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 Logic Symbol IEEE/IEC Truth Table Inputs Outputs A B CLR ...

Page 3

... the event a system does not satisfy the above condition, an external clamping diode (D from rush current. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1 level in the wait state, i.e. when no trigger is applied. CC discharges mainly through the internal (parasitic) diode ...

Page 4

... System Diagram Timing Chart ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 4 www.fairchildsemi.com ...

Page 5

... IC, the width of the output pulse, t follows: t (OUT Retrigger operation (74VHC123A) When a new trigger is applied to either input while in the MONOSTABLE state effective only if the IC is charging C node then falls to V output stays HIGH if the next trigger comes in before ...

Page 6

... Unused inputs must be held HIGH or LOW. They may not float. 2. The maximum allowable values of C and leakage due to board layout and surface resistance. Susceptibility to externally induced noise signals may occur for R > 1MΩ. x ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 Parameter (1) Parameter x x and R ...

Page 7

... Voltage V LOW Level Output OL Voltage I Input Leakage IN Current Terminal Off-State Current I Quiescent Supply CC Current (3) I Active—State CC Supply Current Note: 3. Per circuit. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 (V) Conditions Min. CC 2.0 1.50 0 2.0 2 –50µA 1 3.0 2.9 4.5 4.4 3 –4mA 2. ...

Page 8

... PD consumption without load. Average operating current can be obtained by the equation: I (opr • V • IN Active Supply Current CC Duty: % ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 (4) V (V) Conditions CC 3.3 ± 0 5.0 ± 0 3.3 ± ...

Page 9

... AC Operating Requirement Symbol Parameter t (L), t (H) Minimum Trigger W W Pulse Width t (L) Minimum Clear W Pulse Width t Minimum Retrigger RR Time Note: 6. Refer to Timing Chart. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 ( (V) Conditions Min. CC 3.3 5.0 5.0 5.0 3.3 5.0 5.0 5.0 3.3 ± 0 1kΩ 100pF 5.0 ± 0 1kΩ, ...

Page 10

... Device Characteristics t *C Characteristics (Typ.) wout x Output Pulse Width Constant K-Supply Voltage (Typ.) ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1 Characteristics (Typ Input Equivalent Circuit 10 www.fairchildsemi.com ...

Page 11

... Physical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 Package Number M16A 11 www.fairchildsemi.com ...

Page 12

... Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 Package Number M16D 12 www.fairchildsemi.com ...

Page 13

... Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. 5.00±0.10 4.55 0.11 MTC16rev4 Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 0.65 4.4±0.1 1.45 Package Number MTC16 13 5.90 4.45 7.35 5.00 12° www.fairchildsemi.com ...

Page 14

... Datasheet Identification Product Status Advance Information Formative or In Design Preliminary First Production No Identification Needed Full Production Obsolete Not In Production ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 i-Lo™ Power-SPM™ PowerTrench ImpliedDisconnect™ Programmable Active Droop™ IntelliMAX™ ® QFET ISOPLANAR™ QS™ ...

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