74HCT123D_技术文档

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Rev. 12 — 11 August 2021

Product data sheet

1. General description

The 74HC123; 74HCT123 is a dual retriggerable monostable multivibrator with reset. The basic

output pulse width is programmed by selection of external components (R_EXTand C_EXT). Once

triggered this basic pulse width may be extended by retriggering either of the edge triggered

inputs (nA or nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW)

can be made as long as desired. Alternatively, an output delay can be terminated at any time by

a LOW-going edge on input nRD. Inputs include clamp diodes. This enables the use of current

limiting resistors to interface inputs to voltages in excess of V_CC

.

Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise

and fall times.

2. Features and benefits

•

Wide supply voltage range from 2.0 V to 6.0 V

•

CMOS low power dissipation

High noise immunity

Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

Complies with JEDEC standards:

•

JESD8C (2.7 V to 3.6 V)

JESD7A (2.0 V to 6.0 V)

•

Input levels:

•

For 74HC123: CMOS level

For 74HCT123: TTL level

•

DC triggered from active HIGH or active LOW inputs

Retriggerable for very long pulses up to 100 % duty factor

Direct reset terminates output pulse

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

ESD protection:

•

HBM JESD22-A114F exceeds 2000 V

MM JESD22-A115-A exceeds 200 V

•

Multiple package options

Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

3. Ordering information

Table 1. Ordering information

Type number

Package

Temperature range Name

Description

Version

74HC123D

-40 °C to +125 °C

SO16

plastic small outline package; 16 leads;

body width 3.9 mm

SOT109-1

74HCT123D

74HC123PW

74HCT123PW

74HC123BQ

TSSOP16

plastic thin shrink small outline package; 16 leads; SOT403-1

body width 4.4 mm

DHVQFN16 plastic dual in-line compatible thermal

enhanced very thin quad flat package; no leads;

16 terminals; body 2.5 × 3.5 × 0.85 mm

SOT763-1

4. Functional diagram

14

1CEXT

15

1REXT/CEXT

S

13

1Q

Q

1

1A

T

4

2

3

1B

RD

1RD

6

7

2CEXT

2REXT/CEXT

S

5

2Q

Q

9

2A

T

12

10

11

2B

RD

2RD

001aaa610

Fig. 1. Functional diagram

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74HC_HCT123

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Product data sheet

Rev. 12 — 11 August 2021

2 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

14

CX

15

13

RCX

1

&

2

1CEXT 14

2CEXT

4

6

3

R

1REXT/CEXT 15

2REXT/CEXT

7

6

S

CX

1Q 13

7

5

Q

RCX

2Q

5

1

9

1A

2A

9

T

&

10

1Q

4

2

1B

12

2Q 12

RD

10 2B

11

R

3

1RD

mna515

11

2RD

mna516

Fig. 2. Logic symbol

Fig. 3. IEC logic symbol

nREXT/CEXT

V

CC

nQ

nRD

R

CL

V

CC

V

CC

R

CL

nA

nB

R

mna518

Fig. 4. Logic diagram

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

3 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

5. Pinning information

5.1. Pinning

74HC123

terminal 1

index area

2

3

4

5

6

7

15

14

13

12

11

10

1B

1RD

1REXT/CEXT

1CEXT

1Q

74HC123

74HCT123

1Q

2Q

1A

1

2

3

4

5

6

7

8

16 V

CC

(1)

CC

2CEXT

2REXT/CEXT

2RD

2B

V

1B

1RD

15 1REXT/CEXT

14 1CEXT

13 1Q

1Q

001aaf046

2Q

12 2Q

2CEXT

2REXT/CEXT

GND

11 2RD

Transparent top view

10 2B

(1) This is not a supply pin. There is no electrical or

mechanical requirement to solder the pad. In case

soldered, the solder land should remain floating or

9

2A

001aaa698

connected to V_CC

.

Fig. 5. Pin configuration SOT109-1 (SO16) and

SOT403-1 (TSSOP16)

Fig. 6. Pin configuration SOT763-1 (DHVQFN16)

5.2. Pin description

Table 2. Pin description

Symbol

1

Description

1A

negative-edge triggered input 1

positive-edge triggered input 1

direct reset LOW and positive-edge triggered input 1

active LOW output 1

1B

2

1RD

3

1Q

4

2Q

5

active HIGH output 2

2CEXT

6

external capacitor connection 2

external resistor and capacitor connection 2

ground (0 V)

2REXT/CEXT

7

GND

8

2A

9

negative-edge triggered input 2

positive-edge triggered input 2

direct reset LOW and positive-edge triggered input 2

active LOW output 2

2B

10

11

12

13

14

15

16

2RD

2Q

1Q

active HIGH output 1

1CEXT

1REXT/CEXT

V_CC

external capacitor connection 1

external resistor and capacitor connection 1

supply voltage

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74HC_HCT123

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Product data sheet

Rev. 12 — 11 August 2021

4 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

6. Functional description

Table 3. Function table

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.

Input

Output

nRD

L

nA

X

nB

X

nQ

L

nQ

H

X

H

X

L [1]

H [1]

X

L

H

L

↑

H

↑

↓

H

L

[1] If the monostable was triggered before this condition was established, the pulse will continue as programmed.

7. Limiting values

Table 4. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol

V_CC

I_IK

Parameter

Conditions

Min

Max Unit

supply voltage

-0.5

+7

V

input clamping current

output clamping current

output current

V_I< -0.5 V or V_I> V_CC+ 0.5 V

V_O< -0.5 V or V_O> V_CC+ 0.5 V

-

±20

±25

mA

I_OK

I_O

except for pins nREXT/CEXT;

V_O= -0.5 V to (V_CC+ 0.5 V)

I_CC

supply current

-

50

mA

I_GND

T_stg

P_tot

ground current

-50

storage temperature

total power dissipation

-65

-

+150 °C

500 mW

[1]

[1] For SOT109-1 (SO16) package: P_totderates linearly with 12.4 mW/K above 110 °C.

For SOT403-1 (TSSOP16) package: P_totderates linearly with 8.5 mW/K above 91 °C.

For SOT763-1 (DHVQFN16) package: P_totderates linearly with 11.2 mW/K above 106 °C.

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

5 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

8. Recommended operating conditions

Table 5. Recommended operating conditions

Symbol Parameter

Conditions

74HC123

74HCT123

Unit

Min

2.0

0

Typ

Max

6.0

Min

4.5

0

Typ

Max

5.5

V_CC

V_I

supply voltage

input voltage

output voltage

5.0

V

-

V_CC

-

V_CC

V_O

0

Δt/ΔV

input transition rise and

fall rate

nRD input

V_CC= 2.0 V

-

625

139

83

-

ns/V

V_CC= 4.5 V

V_CC= 6.0 V

1.67

-

1.67

-

139 ns/V

ns/V

+125 °C

-

T_amb

ambient temperature

-40

+25

+125

-40

+25

9. Static characteristics

Table 6. Static characteristics

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter

Conditions

25 °C

-40 °C to +85 °C -40 °C to +125 °C Unit

Min Typ Max

Min

Max

Min

Max

74HC123

V_IH

HIGH-level

input voltage

V_CC= 2.0 V

V_CC= 4.5 V

V_CC= 6.0 V

V_CC= 2.0 V

V_CC= 4.5 V

V_CC= 6.0 V

V_I= V_IHor V_IL

1.5

1.2

2.4

3.2

0.8

-

1.5

-

1.5

-

V

3.15

4.2

-

4.2

-

4.2

-

V_IL

LOW-level

input voltage

-

0.5

-

0.5

1.35

1.8

-

0.5

1.35

1.8

2.1 1.35

2.8

1.8

V_OH

HIGH-level

output voltage

I_O= -20 μA; V_CC= 2.0 V

1.9

4.4

5.9

2.0

4.5

6.0

-

1.9

4.4

-

1.9

4.4

5.9

3.7

5.2

-

V

I_O= -20 μA; V_CC= 4.5 V

I_O= -20 μA; V_CC= 6.0 V

I_O= -4 mA; V_CC= 4.5 V

I_O= -5.2 mA; V_CC= 6.0 V

5.9

3.98 4.32

5.48 5.81

3.84

5.34

V_OL

LOW-level

V_I= V_IHor V_IL

output voltage

I_O= 20 μA; V_CC= 2.0 V

I_O= 20 μA; V_CC= 4.5 V

I_O= 20 μA; V_CC= 6.0 V

I_O= 4 mA; V_CC= 4.5 V

I_O= 5.2 mA; V_CC= 6.0 V

-

0

0.1

-

0.1

-

0.1

0.4

±1.0

V

0.1

V

0.15 0.26

0.16 0.26

0.33

±1.0

V

I_I

input leakage V_I= V_CCor GND; V_CC= 6.0 V

current

-

±0.1

8.0

-

μA

I_CC

C_I

supply current V_I= V_CCor GND; I_O= 0 A;

V_CC= 6.0 V

-

80

-

160

-

μA

pF

input

3.5

capacitance

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

6 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Symbol Parameter

74HCT123

Conditions

25 °C

-40 °C to +85 °C -40 °C to +125 °C Unit

Min Typ Max

Min

Max

Min

Max

V_IH

HIGH-level

input voltage

V_CC= 4.5 V to 5.5 V

2.0

-

1.6

1.2

-

2.0

-

2.0

-

V

V_IL

LOW-level

0.8

input voltage

V_OH

HIGH-level

output voltage

V_I= V_IHor V_IL; V_CC= 4.5 V

I_O= -20 μA

4.4

4.5

-

4.4

-

4.4

3.7

-

V

I_O= -4 mA

3.98 4.32

3.84

V_OL

LOW-level

output voltage

V_I= V_IHor V_IL; V_CC= 4.5 V

I_O= 20 μA

-

0

0.1

-

0.1

-

0.1

0.4

V

I_O= 4.0 mA

0.15 0.26

0.33

±1.0

V

I_I

input leakage V_I= V_CCor GND; V_CC= 5.5 V

current

-

±0.1

±1.0

μA

I_CC

ΔI_CC

supply current V_I= V_CCor GND; I_O= 0 A;

V_CC= 5.5 V

-

8.0

-

80

-

160

μA

additional

supply current V_I= V_CC- 2.1 V;

other inputs at V_CCor GND;

per input pin; I_O= 0 A;

V_CC= 4.5 V to 5.5 V

pins nA, nB

-

35

50

125

180

-

160

225

-

170

245

-

μA

pF

pin nRD

C_I

input

3.5

capacitance

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74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

7 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

10. Dynamic characteristics

Table 7. Dynamic characteristics

Voltages are referenced to GND (ground = 0 V); C_L= 50 pF unless otherwise specified; for test circuit see Fig. 12.

Symbol Parameter

Conditions

25 °C

-40 °C to +85 °C -40 °C to +125 °C Unit

Min Typ Max

Min

Max

Min

Max

74HC123

t_pd

propagation

delay

nRD, nA, nB to nQ or nQ;

C_EXT= 0 pF; R_EXT= 5 kΩ;

see Fig. 9

[1]

V_CC= 2.0 V

-

83 255

-

320

64

-

385

77

-

ns

V_CC= 4.5 V

30

26

24

51

-

V_CC= 5 V; C_L= 15 pF

V_CC= 6.0 V

43

54

65

nRD (reset) to nQ or nQ;

C_EXT= 0 pF; R_EXT= 5 kΩ;

see Fig. 9

V_CC= 2.0 V

-

66 215

-

270

54

-

325

65

-

ns

V_CC= 4.5 V

24

20

19

43

-

V_CC= 5 V; C_L= 15 pF

V_CC= 6.0 V

37

46

55

t_t

transition time see Fig. 9

V_CC= 2.0 V

[1]

-

19

7

75

15

13

-

95

19

16

-

110

22

ns

V_CC= 4.5 V

V_CC= 6.0 V

6

19

t_W

pulse width

nA LOW; see Fig. 10

V_CC= 2.0 V

100

20

8

3

2

-

125

25

-

150

30

-

ns

V_CC= 4.5 V

V_CC= 6.0 V

17

21

26

nB HIGH; see Fig. 10

V_CC= 2.0 V

100 17

-

125

25

-

150

30

-

ns

V_CC= 4.5 V

20

17

6

5

V_CC= 6.0 V

21

26

nRD LOW; see Fig. 11

V_CC= 2.0 V

100 14

-

125

25

-

150

30

-

ns

V_CC= 4.5 V

20

17

5

4

V_CC= 6.0 V

21

26

nQ HIGH and nQ LOW;

V_CC= 5.0 V; see Fig. 10

and Fig. 11

[2]

C_EXT= 100 nF;

R_EXT= 10 kΩ

-

450

75

-

μs

ns

C_EXT= 0 pF;

R_EXT= 5 kΩ

t_rtrig

retrigger time nA, nB; C_EXT= 0 pF;

R_EXT= 5 kΩ; V_CC= 5.0 V;

see Fig. 10

[3] [4]

110

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

8 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Symbol Parameter

Conditions

25 °C

-40 °C to +85 °C -40 °C to +125 °C Unit

Min Typ Max

Min

Max

Min

Max

R_EXT

external timing see Fig. 7

resistor

V_CC= 2.0 V

10

2

-

1000

-

kΩ

pF

V_CC= 5.0 V

C_EXT

C_PD

external timing V_CC= 5.0 V; see Fig. 7

capacitor

[4]

[5]

-

power

dissipation

capacitance

per monostable;

V_I= GND to V_CC

-

54

-

pF

74HCT123

t_PHLHIGH to LOW nRD, nA, nB to nQ or nQ;

propagation

delay

C_EXT= 0 pF; R_EXT= 5 kΩ;

see Fig. 9

V_CC= 4.5 V

-

30

26

51

-

64

-

77

-

ns

V_CC= 5 V; C_L= 15 pF

nRD (reset) to nQ or nQ;

C_EXT= 0 pF; R_EXT= 5 kΩ;

see Fig. 9

V_CC= 4.5 V

-

27

23

46

-

58

-

69

-

ns

V_CC= 5 V; C_L= 15 pF

t_PLH

LOW to HIGH nRD, nA, nB to nQ or nQ;

propagation

delay

C_EXT= 0 pF; R_EXT= 5 kΩ;

see Fig. 9

V_CC= 4.5 V

-

28

26

51

-

64

-

77

-

ns

V_CC= 5 V; C_L= 15 pF

nRD (reset) to nQ or nQ;

C_EXT= 0 pF; R_EXT= 5 kΩ;

see Fig. 9

V_CC= 4.5 V

-

23

7

46

-

58

-

69

-

ns

V_CC= 5 V; C_L= 15 pF

t_t

transition time V_CC= 4.5 V; see Fig. 9

[1]

[2]

15

19

22

t_W

pulse width

V_CC= 4.5 V

nA LOW; see Fig. 10

nB HIGH; see Fig. 10

nRD LOW; see Fig. 11

20

3

5

7

-

25

-

30

-

ns

nQ HIGH and nQ LOW;

V_CC= 5.0 V; see Fig. 10

and Fig. 11

C_EXT= 100 nF;

R_EXT= 10 kΩ

-

450

75

-

μs

ns

C_EXT= 0 pF;

R_EXT= 5 kΩ

t_rtrig

retrigger time nA, nB; C_EXT= 0 pF;

R_EXT= 5 kΩ; V_CC= 5.0 V;

see Fig. 10

[3] [4]

110

R_EXT

C_EXT

external timing V_CC= 5.0 V; see Fig. 7

resistor

2

-

1000

-

kΩ

pF

external timing V_CC= 5.0 V; see Fig. 7

capacitor

[4]

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

9 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Symbol Parameter

Conditions

25 °C

-40 °C to +85 °C -40 °C to +125 °C Unit

Min Typ Max

Min

Max

Min

Max

C_PD

power

per monostable;

[5]

-

56

-

pF

dissipation

capacitance

V_I= GND to V_CC- 1.5 V

[1] t_pdis the same as t_PHLand t_PLH; t_tis the same as t_THLand t_TLH

[2] For other R_EXTand C_EXTcombinations see Fig. 7. If C_EXT> 10 nF, the next formula is valid:

t_W= K × R_EXT× C_EXT, where:

t_W= typical output pulse width in ns;

R_EXT= external resistor in kΩ;

C_EXT= external capacitor in pF;

K = constant = 0.45 for V_CC= 5.0 V and 0.55 for V_CC= 2.0 V, see Fig. 8.

The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.

[3] The time to retrigger the monostable multivibrator depends on the values of R_EXTand C_EXT. The output pulse width will only be

extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If C_EXT>10 pF,

the next formula (at V_CC= 5.0 V) for the setup time of a retrigger pulse is valid:

t_rtrig= 30 + 0.19 × R_EXT× C_EXT^0.9+ 13 × R_EXT^1.05, where:

t_rtrig= retrigger time in ns;

C_EXT= external capacitor in pF; R_EXT= external resistor in kΩ.

The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.

[4] When the device is powered-up, initiate the device via a reset pulse, when C_EXT< 50 pF.

[5] C_PDis used to determine the dynamic power dissipation (P_Din μW).

P_D= C_PDx V_CC²x f_i+ Σ(C_Lx V_CC²x f_o) + 0.75 x C_EXTx V_CC²x f_o+ D x 16 × V_CCwhere:

f_i= input frequency in MHz;

f_o= output frequency in MHz;

D = duty factor in %;

C_L= output load capacitance in pF;

V_CC= supply voltage in V;

C_EXT= timing capacitance in pF;

Σ(C_Lx V_CC²x f_o) sum of outputs.

001aaa611

6

10

t

W

(ns)

(1)

(2)

5

4

3

2

10

001aaa612

0.8

(3)

(4)

10

'K' factor

0.6

0.4

0.2

0

10

2

3

4

1

10

(pF)

C

EXT

V_CC= 5.0 V; T_amb= 25 °C.

(1) R_EXT= 100 kΩ

(2) R_EXT= 50 kΩ

0

2

4

6

8

V

(V)

CC

(3) R_EXT= 10 kΩ

C_EXT= 10 nF; R_EXT= 10 kΩ to 100 kΩ.

T_amb= 25 °C.

(4) R_EXT= 2 kΩ

Fig. 7. Typical output pulse width as a function of the

external capacitor value

Fig. 8. 74HC123 typical ‘K’ factor as function of V_CC

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74HC_HCT123

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Product data sheet

Rev. 12 — 11 August 2021

10 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

10.1. Waveforms and test circuit

V

I

V

nB input

M

GND

t

W

V

I

V

M

nA input

GND

t

W

V

I

V

nRD input

GND

M

t

W

PLH

V

OH

V

Y

nQ output

V

M

V

X

V

OL

t

THL

PHL

(reset)

PLH

t

W

t

W

V

OH

V

Y

nQ output

V

M

V

X

V

OL

t

PLH

t

PHL

TLH

(reset)

001aaa771

Measurement points are given in Table 8.

V_OLand V_OHare typical voltage output levels that occur with the output load.

Fig. 9. Propagation delays from inputs (nA, nB, nRD) to outputs (nQ, nQ) and output transition times

nB input

t

W

nA input

t

W

rtrig

nQ output

t

W

t

mna521

W

nRD = HIGH

Fig. 10. Output pulse control using retrigger pulse

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74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

11 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

nB input

nRD input

t

W

nQ output

t

W

mna522

nA = LOW

Fig. 11. Output pulse control using reset input nRD

t

W

V

I

90 %

negative

pulse

V

M

10 %

0 V

t

r

f

t

f

r

V

I

90 %

positive

pulse

V

M

10 %

0 V

t

W

V

CC

V

I

V

O

R

L

S1

G

open

DUT

R

T

C

L

001aad983

Test data is given in Table 8.

Definitions test circuit:

R_T= Termination resistance should be equal to output impedance Z_oof the pulse generator.

C_L= Load capacitance including jig and probe capacitance.

R_L= Load resistance.

S1 = Test selection switch.

Fig. 12. Test circuit for measuring switching times

Table 8. Test data

Type

Input

V_I

Load

S1 position

t_PHL, t_PLH

open

t_r, t_f

6 ns

C_L

R_L

74HC123

V_CC

3 V

15 pF, 50 pF

1 kΩ

74HCT123

open

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

12 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

11. Application information

11.1. Timing component connections

The basic output pulse width is essentially determined by the values of the external timing

components R_EXTand C_EXT

.

C

EXT

R

EXT

(1)

V

CC

GND

8

nCEXT nREXT/CEXT

14 (6) 15 (7)

13 (5)

123

nQ

1 (9)

nA

nB

2 (10)

4 (12)

3 (11)

nRD

001aaa854

(1) For minimum noise generation it is recommended to ground pins 6 (2CEXT) and

14 (1CEXT) externally to pin 8 (GND).

Fig. 13. Timing component connections

11.2. Power-up considerations

When the monostable is powered-up it may produce an output pulse, with a pulse width defined by

the values of R_EXTand C_EXT. This output pulse can be eliminated using the circuit shown in Fig. 14.

C

EXT

R

EXT

V

CC

GND

8

nCEXT

14 (6)

nREXT/CEXT

15 (7)

13 (5)

123

nQ

1 (9)

nA

nB

2 (10)

4 (12)

nQ

3 (11)

nRD

V

RESET

CC

001aaa613

Fig. 14. Power-up output pulse elimination circuit

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

13 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

11.3. Power-down considerations

A large capacitor C_EXTmay cause problems when powering-down the monostable due to the

energy stored in this capacitor. When a system containing this device is powered-down or a

rapid decrease of V_CCto zero occurs, the monostable may sustain damage, due to the capacitor

discharging through the input protection diodes. To avoid this possibility, use a damping diode

(D_EXT) preferably a germanium or Schottky type diode able to withstand large current surges and

connect as shown in Fig. 15.

D

EXT

C

EXT

R

EXT

V

CC

GND

8

nCEXT

14 (6)

nREXT/CEXT

15 (7)

13 (5)

123

nQ

1 (9)

nA

nB

2 (10)

4 (12)

nQ

3 (11)

001aaa614

nRD

Fig. 15. Power-down protection circuit

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

14 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

12. Package outline

SO16: plastic small outline package; 16 leads; body width 3.9 mm

SOT109-1

D

E

A

X

v

c

y

H

M

A

E

Z

16

9

Q

A

2

A

(A )

3

A

1

pin 1 index

θ

L

p

L

1

8

e

w

M

detail X

b

p

0

2.5

scale

5 mm

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

A

(1)

UNIT

A

b

c

D

E

e

H

E

L

p

Q

v

w

y

Z

θ

1

2

3

p

max.

0.25

0.10

1.45

1.25

0.49

0.36

0.25

0.19

10.0

9.8

4.0

3.8

6.2

5.8

1.0

0.4

0.7

0.6

0.7

0.3

mm

1.27

0.05

1.05

0.041

1.75

0.25

0.01

0.25

0.1

0.25

0.01

8^o

0^o

0.0100

0.0075

0.010 0.057

0.004 0.049

0.019

0.014

0.39

0.38

0.16

0.15

0.244

0.228

0.039 0.028

0.016 0.020

0.028

0.012

inches

0.069

0.01 0.004

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

JEITA

99-12-27

03-02-19

SOT109-1

076E07

MS-012

Fig. 16. Package outline SOT109-1 (SO16)

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

15 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm

SOT403-1

D

E

A

X

c

y

H

v

M

A

E

Z

9

16

Q

(A )

3

A

2

A

1

pin 1 index

θ

L

p

L

1

8

detail X

w

M

b

p

e

0

2.5

5 mm

scale

DIMENSIONS (mm are the original dimensions)

A

(1)

(2)

(1)

UNIT

A

b

c

D

E

e

H

L

Q

v

w

y

Z

θ

1

2

3

p

E

p

max.

8^o

0^o

0.15

0.05

0.95

0.80

0.30

0.19

0.2

0.1

5.1

4.9

4.5

4.3

6.6

6.2

0.75

0.50

0.4

0.3

0.40

0.06

mm

1.1

0.65

1

0.2

0.13

0.1

0.25

Notes

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

JEITA

99-12-27

03-02-18

SOT403-1

MO-153

Fig. 17. Package outline SOT403-1 (TSSOP16)

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

16 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

DHVQFN16: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads;

16 terminals; body 2.5 x 3.5 x 0.85 mm

SOT763-1

B

A

D

A

1

E

c

detail X

terminal 1

index area

C

terminal 1

index area

e

1

y

e

b

v

M

C

A

B

C

1

w

M

2

7

L

1

8

9

E

h

e

16

15

10

D

h

X

0

2.5

scale

5 mm

DIMENSIONS (mm are the original dimensions)

(1)

A

(1)

UNIT

A

1

b

c

E

h

e

y

D

E

L

v

w

y

1

h

max.

0.05 0.30

0.00 0.18

3.6

3.4

2.15

1.85

2.6

2.4

1.15

0.85

0.5

0.3

mm

0.05

0.1

1

0.2

0.5

2.5

0.1

0.05

Note

1. Plastic or metal protrusions of 0.075 mm maximum per side are not included.

REFERENCES

OUTLINE

EUROPEAN

PROJECTION

ISSUE DATE

VERSION

IEC

JEDEC

JEITA

02-10-17

03-01-27

SOT763-1

- - -

MO-241

- - -

Fig. 18. Package outline SOT763-1 (DHVQFN16)

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

17 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

13. Abbreviations

Table 9. Abbreviations

Acronym

CMOS

DUT

Abbreviation

Complementary Metal Oxide Semiconductor

Device Under Test

ESD

ElectroStatic Discharge

Human Body Model

Machine Model

HBM

MM

TTL

Transistor-Transistor Logic

14. Revision history

Table 10. Revision history

Document ID

Release date

20210811

Data sheet status

Change notice

Supersedes

74HC_HCT123 v.12

Modifications:

Product data sheet

-

74HC_HCT123 v.11

•

Type numbers 74HC123DB and 74HCT123DB (SOT338-1/SSOP16) removed.

74HC_HCT123 v.11

Modifications:

20200903 Product data sheet 74HC_HCT123 v.10

-

•

The format of this data sheet has been redesigned to comply with the identity guidelines of

Nexperia.

•

Legal texts have been adapted to the new company name where appropriate.

Section 1 and Section 2 updated.

Table 4: Derating values for P_tottotal power dissipation have been updated.

74HC_HCT123 v.10

Modifications:

20151203

Type numbers 74HC123N and 74HCT123N (SOT38-4) removed.

20150119 Product data sheet

Product data sheet

-

74HC_HCT123 v.9

•

74HC_HCT123 v.9

Modifications:

-

74HC_HCT123 v.8

•

Table 7: Power dissipation capacitance condition for 74HCT123 is corrected.

74HC_HCT123 v.8

Modifications:

20111216

Product data sheet

-

74HC_HCT123 v.7

•

Legal pages updated.

74HC_HCT123 v.7

74HC_HCT123 v.6

74HC_HCT123 v.5

74HC_HCT123 v.4

74HC_HCT123 v.3

20110825

20110314

20090713

20060616

20040511

Product data sheet

Product specification

-

74HC_HCT123 v.6

74HC_HCT123 v.5

74HC_HCT123 v.4

74HC_HCT123 v.3

74HC_HCT123_CNV v.2

-

74HC_HCT123_CNV v.2 19980708

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

18 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

injury, death or severe property or environmental damage. Nexperia and its

suppliers accept no liability for inclusion and/or use of Nexperia products in

such equipment or applications and therefore such inclusion and/or use is at

the customer’s own risk.

15. Legal information

Quick reference data — The Quick reference data is an extract of the

product data given in the Limiting values and Characteristics sections of this

document, and as such is not complete, exhaustive or legally binding.

Data sheet status

Document status Product

Definition

Applications — Applications that are described herein for any of these

products are for illustrative purposes only. Nexperia makes no representation

or warranty that such applications will be suitable for the specified use

without further testing or modification.

[1][2]

status [3]

Objective [short]

data sheet

Development

This document contains data from

the objective specification for

product development.

Customers are responsible for the design and operation of their applications

and products using Nexperia products, and Nexperia accepts no liability for

any assistance with applications or customer product design. It is customer’s

sole responsibility to determine whether the Nexperia product is suitable

and fit for the customer’s applications and products planned, as well as

for the planned application and use of customer’s third party customer(s).

Customers should provide appropriate design and operating safeguards to

minimize the risks associated with their applications and products.

Preliminary [short]

data sheet

Qualification

Production

This document contains data from

the preliminary specification.

Product [short]

data sheet

This document contains the product

specification.

[1] Please consult the most recently issued document before initiating or

completing a design.

Nexperia does not accept any liability related to any default, damage, costs

or problem which is based on any weakness or default in the customer’s

applications or products, or the application or use by customer’s third party

customer(s). Customer is responsible for doing all necessary testing for the

customer’s applications and products using Nexperia products in order to

avoid a default of the applications and the products or of the application or

use by customer’s third party customer(s). Nexperia does not accept any

liability in this respect.

[2] The term 'short data sheet' is explained in section "Definitions".

[3] The product status of device(s) described in this document may have

changed since this document was published and may differ in case of

multiple devices. The latest product status information is available on

the internet at https://www.nexperia.com.

Definitions

Limiting values — Stress above one or more limiting values (as defined in

the Absolute Maximum Ratings System of IEC 60134) will cause permanent

damage to the device. Limiting values are stress ratings only and (proper)

operation of the device at these or any other conditions above those

given in the Recommended operating conditions section (if present) or the

Characteristics sections of this document is not warranted. Constant or

repeated exposure to limiting values will permanently and irreversibly affect

the quality and reliability of the device.

Draft — The document is a draft version only. The content is still under

internal review and subject to formal approval, which may result in

modifications or additions. Nexperia does not give any representations or

warranties as to the accuracy or completeness of information included herein

and shall have no liability for the consequences of use of such information.

Short data sheet — A short data sheet is an extract from a full data sheet

with the same product type number(s) and title. A short data sheet is

intended for quick reference only and should not be relied upon to contain

detailed and full information. For detailed and full information see the relevant

full data sheet, which is available on request via the local Nexperia sales

office. In case of any inconsistency or conflict with the short data sheet, the

full data sheet shall prevail.

Terms and conditions of commercial sale — Nexperia products are

sold subject to the general terms and conditions of commercial sale, as

published at http://www.nexperia.com/profile/terms, unless otherwise agreed

in a valid written individual agreement. In case an individual agreement is

concluded only the terms and conditions of the respective agreement shall

apply. Nexperia hereby expressly objects to applying the customer’s general

terms and conditions with regard to the purchase of Nexperia products by

customer.

Product specification — The information and data provided in a Product

data sheet shall define the specification of the product as agreed between

Nexperia and its customer, unless Nexperia and customer have explicitly

agreed otherwise in writing. In no event however, shall an agreement be

valid in which the Nexperia product is deemed to offer functions and qualities

beyond those described in the Product data sheet.

No offer to sell or license — Nothing in this document may be interpreted

or construed as an offer to sell products that is open for acceptance or the

grant, conveyance or implication of any license under any copyrights, patents

or other industrial or intellectual property rights.

Export control — This document as well as the item(s) described herein

may be subject to export control regulations. Export might require a prior

authorization from competent authorities.

Disclaimers

Limited warranty and liability — Information in this document is believed

to be accurate and reliable. However, Nexperia does not give any

representations or warranties, expressed or implied, as to the accuracy

or completeness of such information and shall have no liability for the

consequences of use of such information. Nexperia takes no responsibility

for the content in this document if provided by an information source outside

of Nexperia.

Non-automotive qualified products — Unless this data sheet expressly

states that this specific Nexperia product is automotive qualified, the

product is not suitable for automotive use. It is neither qualified nor tested in

accordance with automotive testing or application requirements. Nexperia

accepts no liability for inclusion and/or use of non-automotive qualified

products in automotive equipment or applications.

In no event shall Nexperia be liable for any indirect, incidental, punitive,

special or consequential damages (including - without limitation - lost

profits, lost savings, business interruption, costs related to the removal

or replacement of any products or rework charges) whether or not such

damages are based on tort (including negligence), warranty, breach of

contract or any other legal theory.

In the event that customer uses the product for design-in and use in

automotive applications to automotive specifications and standards,

customer (a) shall use the product without Nexperia’s warranty of the

product for such automotive applications, use and specifications, and (b)

whenever customer uses the product for automotive applications beyond

Nexperia’s specifications such use shall be solely at customer’s own risk,

and (c) customer fully indemnifies Nexperia for any liability, damages or failed

product claims resulting from customer design and use of the product for

automotive applications beyond Nexperia’s standard warranty and Nexperia’s

product specifications.

Notwithstanding any damages that customer might incur for any reason

whatsoever, Nexperia’s aggregate and cumulative liability towards customer

for the products described herein shall be limited in accordance with the

Terms and conditions of commercial sale of Nexperia.

Translations — A non-English (translated) version of a document is for

reference only. The English version shall prevail in case of any discrepancy

between the translated and English versions.

Right to make changes — Nexperia reserves the right to make changes

to information published in this document, including without limitation

specifications and product descriptions, at any time and without notice. This

document supersedes and replaces all information supplied prior to the

publication hereof.

Trademarks

Suitability for use — Nexperia products are not designed, authorized or

warranted to be suitable for use in life support, life-critical or safety-critical

systems or equipment, nor in applications where failure or malfunction

of an Nexperia product can reasonably be expected to result in personal

Notice: All referenced brands, product names, service names and

trademarks are the property of their respective owners.

©

74HC_HCT123

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Product data sheet

Rev. 12 — 11 August 2021

19 / 20

Nexperia

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Contents

1. General description......................................................1

2. Features and benefits.................................................. 1

3. Ordering information....................................................2

4. Functional diagram.......................................................2

5. Pinning information......................................................4

5.1. Pinning.........................................................................4

5.2. Pin description.............................................................4

6. Functional description................................................. 5

7. Limiting values............................................................. 5

8. Recommended operating conditions..........................6

9. Static characteristics....................................................6

10. Dynamic characteristics............................................ 8

10.1. Waveforms and test circuit...................................... 11

11. Application information............................................13

11.1. Timing component connections............................... 13

11.2. Power-up considerations..........................................13

11.3. Power-down considerations.....................................14

12. Package outline........................................................ 15

13. Abbreviations............................................................18

14. Revision history........................................................18

15. Legal information......................................................19

For more information, please visit: http://www.nexperia.com

For sales office addresses, please send an email to: salesaddresses@nexperia.com

Date of release: 11 August 2021

©

74HC_HCT123

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 12 — 11 August 2021

20 / 20


型号：	74HCT123D
厂家：	Nexperia
描述：	Dual retriggerable monostable multivibrator with resetProduction
文件：	总20页 (文件大小：317K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

74HCT123D [NEXPERIA]

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74HCT123DB-T

74HCT123N

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