Philips 74lv123 DATASHEETS

INTEGRATED CIRCUITS

74LV123

Dual retriggerable monostable multivibrator with reset

Product specification Supersedes data of 1997 Feb 04 IC24 Data Handbook

 

1998 Apr 20

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator with reset

FEA TURES

•Optimized for Low Voltage applications: 1.0 to 5.5V

•Accepts TTL input levels between V

•Typical V

amb

•Typical V

amb

(output ground bounce)  0.8V @ VCC = 3.3V,

OLP

= 25°C

(output VOH undershoot)  2V @ VCC = 3.3V,

OHV

= 25°C

= 2.7V and VCC = 3.6V

•DC triggered from active HIGH or active LOW inputs

•Retriggerable for very long pulses up to 100% duty factor

•Direct reset terminates output pulses

•Schmitt-trigger action on all inputs except for the reset input

•Output capability: standard (except for nR

•I

category: MSI

EXT/CEXT

QUICK REFERENCE DATA

GND = 0V; T

SYMBOL

PHL/tPLH

NOTES:

1. C

is used to determine the dynamic power dissipation (PD in µW)

= CPD  V

= input frequency in MHz; CL = output load capacitance in pF;

= output frequency in MHz; VCC = supply voltage in V;

 (C

= 25°C; tr = tf 2.5 ns

amb

 V

 fo) = sum of the outputs.

PARAMETER CONDITIONS TYPICAL UNIT

Propagation delay nA, nB to nQ, nQ nRD to nQ, nQ

Input capacitance 3.5 pF Power dissipation capacitance per monost-

able

 fi  (CL  V

 fo) where:

)

DESCRIPTION

The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC/HCT123.

The 74LV123 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (R capacitor (C Figure 1. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA process, the output pulse period (nQ = HIGH, nQ made as long as desired. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nR also inhibits the triggering. Figures 1 and 2 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the values of the external timing components R see Figure 5. When C width is defined as: t t

= pulse width in ns; R

EXT

nB inputs makes the circuit highly tolerant of slower input rise and fall times.

CL = 15pF V

= 3.3V

= 5KΩ

EXT

= 0pF

EXT

VCC = 3.3V, VI = GND to V

74L V123

) and

). They are normally connected as shown in

EXT

) or the active HIGH-going edge input (nB). By repeating this

and C

EXT

= external capacitor in pF. Schmitt-trigger action in the nA and

. For pulse width when C

EXT

 10,000pF, the typical output pulse

EXT

= 0.45  R

= external resistor in KΩ; and

EXT

 C

EXT

25 20

60 pF

EXT

= LOW) can be

EXT

(typ.), where

EXT

, which

<10000pF,

ns ns

ORDERING INFORMATION

PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #

16-Pin Plastic DIL –40°C to +125°C 74LV123 N 74LV123 N SOT38-1 16-Pin Plastic SO –40°C to +125°C 74LV123 D 74LV123 D SOT109-1 16-Pin Plastic SSOP Type II –40°C to +125°C 74LV123 DB 74LV123 DB SOT338-1 16-Pin Plastic TSSOP Type I –40°C to +125°C 74L V123 PW 74LV123PW DH SOT403-1

1998 Apr 28 853–191 1 19290

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator with reset

PIN CONFIGURATION

SV00096

EXT/CEXT

EXT

1A 1B

4 5

EXT

GND

7 8

EXT/CEXT

PIN DESCRIPTION

NUMBER

1,9 1A, 2A

2,10 1B, 2B

3,11 1RD, 2R

4, 12 1Q, 2Q Outputs (active LOW)

7 2R 8 GND Ground (0V)

13, 5 1Q, 2Q Outputs (active HIGH) 14, 6

15 1R 16 V

SYMBOL FUNCTION

Trigger inputs (negative-edge triggered)

Trigger inputs (positive-edge triggered)

Direct reset LOW and trigger action at

positive edge

EXT/CEXT

EXT,

EXT

EXT/CEXT

External resistor/capacitor connection

External capacitor connection External resistor/capacitor connection

Positive supply voltage

LOGIC SYMBOL (IEEE/IEC)

14 15

1 2

6 7

9 10

CX RCX

LOGIC SYMBOL

1 9

FUNCTIONAL DIAGRAM

74LV123

EXT

EXT/CEXT

1Q 2Q

SV00097

EXT

1Q 2Q

SV00099

1998 Apr 28

SV00098

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator with reset

LOGIC DIAGRAM

CLCLV

74LV123

EXT/CEXT

It is recommended that Pin 6 (2C

) and Pin 14 (1C

EXT

CLCL

FUNCTION TABLE

INPUTS OUTPUTS

L X X L H X H X L * H * X X L L * H * H L ↑ H ↓ H ↑ L H

NOTES:

* If the monostable was triggered before this condition was

established, the pulse will continue as programmed. H = HIGH voltage level L = LOW voltage level X = don’t care

↑ = LOW-to-HIGH transition ↓ = HIGH-to-LOW transition

= one HIGH level output pulse = one LOW level output pulse

nA nB nQ nQ

) by externally grounded to Pin 8 (GND)

EXT

to nC

(pin 14 or 6)

Figure 1.Timing component connection

EXT

SV00100

EXT

to nR

EXT/CEXT

(pin 15 or 7)

SV00101

1998 Apr 28

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator

74LV123

with reset

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT

1.0 3.3 5.5 V

CC CC

–40 –40

– – – –

+85

+125

500 200 100

tr, t

amb

DC supply voltage See Note Input voltage 0 – V

Output voltage 0 – V

Operating ambient temperature range in free air

Input rise and fall times except for

Schmitt-trigger inputs

NOTE:

1. The LV is guaranteed to function down to V

ABSOLUTE MAXIMUM RATINGS

= 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.

1, 2

In accordance with the Absolute Maximum Rating System (IEC 134). Voltages are referenced to GND (ground = 0V).

SYMBOL

I

DC supply voltage –0.5 to +7.0 V DC input diode current VI < –0.5 or VI > VCC + 0.5V 20 mA DC output diode current VO < –0.5 or VO > VCC + 0.5V 50 mA DC output source or sink current

– standard outputs

PARAMETER CONDITIONS RATING UNIT

–0.5V < VO < VCC + 0.5V

See DC and AC

characteristics

VCC = 1.0V to 2.0V VCC = 2.0V to 2.7V VCC = 2.7V to 3.6V VCC = 3.6V to 5.5V

V V

°C

ns/V

I

GND

TOT

stg

DC VCC or GND current for types with

– standard outputs 50

Storage temperature range –65 to +150 °C Power dissipation per package

– plastic DIL – plastic mini-pack (SO) – plastic shrink mini-pack (SSOP and TSSOP)

for temperature range: –40 to +125°C above +70°C derate linearly with 12 mW/K above +70°C derate linearly with 8 mW/K above +60°C derate linearly with 5.5 mW/K

750 500 500

NOTES:

1. Stresses beyond those listed 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 voltage ratings may be exceeded if the input and output current ratings are observed.

1998 Apr 28

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