TEXAS INSTRUMENTS SN54AHCT123A Technical data

SOIC

D

AHCT123A

40°C to 85°C

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SN54AHCT123A, SN74AHCT123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

D

Inputs Are TTL-Voltage Compatible

D

Schmitt-Trigger Circuitry On A, B, and CLR Inputs for Slow Input Transition Rates

D

Edge Triggered From Active-High or Active-Low Gated Logic Inputs

D

Retriggerable for Very Long Output Pulses

D

Overriding Clear Terminates Output Pulse

D

Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

D

ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101)

description/ordering information

These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A goes high. In the second method, the B input is high, and the A the A

input is low, the B input is high, and the clear

(CLR

) input goes high.

input goes low. In the third method,

The output pulse duration is programmed by selecting external resistance and capacitance values. The external timing capacitor must be connected between C and an external resistor connected between R

ext/Cext

and VCC. To obtain variable pulse durations, connect an external variable resistance between R

ext/Cext

duration also can be reduced by taking CLR

input is low, and the B input

and R

ext

ext/Cext

and VCC. The output pulse

(positive)

low.

SN54AHCT123A ...J OR W PACKAGE

SN74AHCT123A . . . D, DB, DGV, N, OR PW PACKAGE

1CLR

2R

ext/Cext

SN54AHCT123A . . . FK PACKAGE

2C

GND

1A 1B

1Q 2Q

ext

(TOP VIEW)

1

16

2

15

3

14

4

13

5

12

6

11

7

10

8

9

(TOP VIEW)

V

CC

1R

ext/Cext

1C

ext

1Q 2Q 2CLR 2B 2A

ext

/C

ext

GND

NC

CC

V

2A

1R

18 17 16 15 14

2B

1C

ext

1Q NC 2Q 2CLR

1CLR

1Q

NC

2Q

2C

ext

1B1ANC

3212019

4 5 6 7 8

910111213

ext

/C

ext

2R

NC – No internal connection

T

A

PDIP – N Tube SN74AHCT123AN SN74AHCT123AN

–

–55°C to 125°C

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package.

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.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

SSOP – DB Tape and reel SN74AHCT123ADBR HB123A TSSOP – PW Tape and reel SN74AHCT123APWR HB123A TVSOP – DGV Tape and reel SN74AHCT123ADGVR HB123A CDIP – J Tube SNJ54AHCT123AJ SNJ54AHCT123AJ CFP – W Tube SNJ54AHCT123AW SNJ54AHCT123AW LCCC – FK Tube SNJ54AHCT123AFK SNJ54AHCT123AFK

ORDERING INFORMA TION

PACKAGE

–

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

†

Tube SN74AHCT123AD Tape and reel SN74AHCT123ADR

ORDERABLE

PART NUMBER

TOP-SIDE MARKING

Copyright  2003, Texas Instruments Incorporated

On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters.

1

SN54AHCT123A, SN74AHCT123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

description/ordering information(continued)

Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. The A rates with jitter-free triggering at the outputs.

, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition

Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A high-level-active (B) input. Pulse duration can be reduced by taking CLR A

or B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early

low. CLR input can be used to override

) or

clearing. The variance in output pulse duration from device to device typically is less than ±0.5% for given external timing

components. An example of this distribution for the ’AHCT123A is shown in Figure 10. V ariations in output pulse duration versus supply voltage and temperature are shown in Figure 6.

During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free, without applying a reset pulse.

For additional application information on multivibrators, see the application report, Designing With the SN74AHC123A and SN74AHCT123A, literature number SCLA014.

FUNCTION TABLE

(each multivibrator)

INPUTS

CLR A B Q Q

L X X L H X HXL†H

X XLL†H H L ↑ H ↑ L H

†

These outputs are based on the assumption that the indicated steady-state conditions at the A B inputs have been set up long enough to complete any pulse started before the setup.

#

OUTPUTS

† †

H

and

logic diagram, each multivibrator (positive logic)

A

B

CLR

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

R

ext/Cext

C

ext

Q

R

Q

input/output timing diagram

A

B

CLR

R

ext/Cext

Q

SN54AHCT123A, SN74AHCT123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

t

rr

Q

t

w

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

Supply voltage range, V Input voltage range, V Output voltage range, V Input clamp current, I Output clamp current, I Continuous output current, I Continuous current through V Package thermal impedance, θ

(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

(see Note 2) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

(see Note 1) –0.5 V to VCC+ 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

(V

< 0) –20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IK

I

(V

OK

< 0 or VO > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

(V

= 0 to VCC) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

or GND ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

(see Note 3): D package 73°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

JA

t

w

tw + t

rr

†

DB package 82°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DGV package 120°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 67°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package 108°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

†

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.

NOTES: 1. Voltage values are with respect to the network ground terminal.

2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

3. The package thermal impedance is calculated in accordance with JESD 51-7.

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

SN54AHCT123A, SN74AHCT123A

UNIT

PARAMETER

TEST CONDITIONS

V

UNIT

V

4.5 V

V

4.5 V

V

TEST CONDITIONS

UNIT

t

ns

t

Pul

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

recommended operating conditions (see Note 4)

SN54AHCT123A SN74AHCT123A

MIN MAX MIN MAX

V

CC

V

IH

V

IL

V

I

V

O

I

OH

I

OL

R

ext

∆t/∆V T

A

NOTE 4: Unused R

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)

OH

OL

I

CC

I

CC

∆I

CC

C

i

* On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V.

†

This test is performed with the terminal in the off-state condition.

‡

This is the increase in supply current for each input at one of the specified TTL voltage levels rather than 0 V or VCC.

Supply voltage 4.5 5.5 4.5 5.5 V High-level input voltage 2 2 V Low-level input voltage 0.8 0.8 V Input voltage 0 5.5 0 5.5 V Output voltage 0 V High-level output current –8 –8 mA Low-level output current 8 8 mA External timing resistance 1k 1k Ω Power-up ramp rate 1 1 ms/V

CC

Operating free-air temperature –55 125 –40 85 °C

terminals should be left unconnected. All remaining unused inputs of the device must be held at VCC or GND to ensure

proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

R

ext/Cext

A, B, and CLR

Quiescent VI = VCC or GND, IO = 0 5.5 V 4 40 40 Active state

(per circuit)

‡

ext/Cext

CC

IOH = –50 mA IOH = –8 mA IOL = 50 mA IOL = 8 mA

†

VI = VCC or GND 5.5 V ±0.25 ±2.5 ±2.5 VI = VCC or GND 0 V to 5.5 V ±0.1 ±1* ±1

VI = VCC or GND, R

One input at 3.4 V , Other inputs at VCC or GND

VI = VCC or GND 5 V 1.9 10 10 pF

ext/Cext

= 0.5 V

CC

5.5 V 560 750 975 975

5.5 V 1.35 1.5 1.5 mA

TA = 25°C SN54AHCT123A SN74AHCT123A

MIN TYP MAX MIN MAX MIN MAX

4.4 4.5 4.4 4.4

3.94 3.8 3.8

0.1 0.1 0.1

0.36 0.5 0.44

CC

0 V

CC

V

m

A

m

A

m

A

timing requirements over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)

w

rr

§

See retriggering data in the application information section.

4

Pulse duration

CLR 5 5 5 A

se retrigger time

TA = 25°C SN54AHCT123A SN74AHCT123A

MIN TYP MAX MIN MAX MIN MAX

or B trigger 5 5 5

R

ext

R

ext

= 1 kΩ, C = 1 kΩ, C

= 100 pF

ext

= 0.01 mF

ext

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

§

60

1.5

§ §

ns

m

s

FROMTOTEST

A

PARAMETER

UNIT

A

B

Q

C

15 pF

ns

CLR

Q

C

15 pF

ns

CLR tri

Q

C

15 pF

ns

A

B

Q

C

50 pF

ns

CLR

Q

C

50 pF

ns

CLR tri

Q

C

50 pF

ns

†

SN54AHCT123A, SN74AHCT123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

switching characteristics over recommended operating free-air temperature range, V

= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)

CC

T

= 25°C

(INPUT) (OUTPUT) CONDITIONS

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

w

‡

∆t

w

* On products compliant to MIL-PRF-38535, this parameter is not production tested.

†

tw = Pulse duration at Q and Q

‡

∆tw = Output pulse-duration variation (Q and Q

or

gger

Q or Q

outputs

or

CL = 50 pF,

C

R CL = 50 pF,

C

ext

R

CL = 50 pF,

C

R

) between circuits in same package

=

L

=

L

=

L

=

L

=

L

=

L

= 28 pF,

ext

= 2 kΩ

ext

= 0.01 µF,

= 10 kΩ

ext

= 0.1 µF,

ext

= 10 kΩ

ext

p

MIN TYP MAX

5.3* 10* 1* 13* 1 11

7.7* 12* 1* 15* 1 13

7.7* 12* 1* 15* 1 13 8* 13* 1* 16* 1 14 8* 13* 1* 16* 1 14

6.8 11 1 14 1 12

9.2 13 1 16 1 14

9.5 14 1 17 1 15

133 200 240 240 ns

90 100 110 90 110 90 110

0.9 1 1.1 0.9 1.1 0.9 1.1 ms

±1 %

SN54AHCT123A SN74AHCT123A

MIN MAX MIN MAX

m

s

operating characteristics, V

C

Power dissipation capacitance No load 29 pF

pd

= 5 V, TA = 25°C

CC

PARAMETER TEST CONDITIONS TYP UNIT

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

SN54AHCT123A, SN74AHCT123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

PARAMETER MEASUREMENT INFORMATION

From Output

Under Test

(see Note A)

Input A

(see Note B)

Input B

(see Note B)

t

PLH

In-Phase

Output

t

PHL

Out-of-Phase

Output

VOLTAGE WAVEFORMS

NOTES: A. CL includes probe and jig capacitance.

B. All input pulses are supplied by generators having the following characteristics: ZO = 50 Ω, tr +3 ns, tf + 3 ns. C. The outputs are measured one at a time with one input transition per measurement.

C

LOAD CIRCUIT

1.5 V

DELA Y TIMES

L

50% V

Test Point

CC

3 V

0 V

3 V

0 V

V

OH

OL

OH

OL

Inputs

Outputs

Input CLR

(see Note B)

In-Phase

Output

Out-of-Phase

Output

t

w

50% V

CC

VOLTAGE WAVEFORMS

PULSE DURATION

1.5 V 1.5 V

t

PLH

50% V

t

PHL

50% V

VOLTAGE WAVEFORMS

DELA Y TIMES

CC

1.5 V1.5 V

50% V

t

PHL

t

PLH

CC

3 V

0 V

V

CC

V

CC

V

3 V

0 V

V

OH

OL

OH

OL

OH

OL

Figure 1. Load Circuit and Voltage Waveforms

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54AHCT123A, SN74AHCT123A

DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

SCLS420G – JUNE 1998 – REVISED APRIL 2003

APPLICATION INFORMATION

caution in use

To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep the wiring between the external components and C

power-down considerations

ext

and R

ext/Cext

terminals as short as possible.

Large values of C

may cause problems when powering down the ’AHCT123A devices because of the amount

ext

of energy stored in the capacitor. When a system containing this device is powered down, the capacitor may discharge from V must be limited to 30 mA; therefore, the turn-off time of the V t = V

CC

× C

ext

through the protection diodes at pin 2 or pin 14. Current through the input protection diodes

CC

/30 mA. For example, if VCC = 5 V and C

= 15 pF , the VCC supply must turn off no faster than

ext

power supply must not be faster than

CC

t = (5 V) ×(15 pF)/30mA = 2.5 ns. Usually , this is not a problem because power supplies are heavily filtered and cannot discharge at this rate. When a more rapid decrease of V

to zero occurs, the ’AHCT123A devices may

CC

sustain damage. To avoid this possibility, use external clamping diodes.

output pulse duration

The output pulse duration, tw, is determined primarily by the values of the external capacitance (CT) and timing resistance (R

). The timing components are connected as shown in Figure 2.

T

V

CC

R

T

C

T

To R

Terminal

ext/Cext

To C

ext

Terminal

Figure 2. Timing-Component Connections

The pulse duration is given by:

+K

t

w

RT

C

T

(1)

if CT is ≥ 1000 pF, K = 1.0 or if C

is < 1000 pF, K can be determined from Figure 5

T

where:

= pulse duration in ns

t

w

R

= external timing resistance in kΩ

T

C

= external capacitance in pF

T

K = multiplier factor

Equation 1 and Figure 3 can be used to determine values for pulse duration, external resistance, and external capacitance.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7