TEXAS INSTRUMENTS SN54ALS874B Technical data

SN54ALS874B, SN74ALS874B, SN74ALS876A

SN74AS874, SN74AS876

DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SDAS061C – APRIL 1982 – REVISED JANUARY 1995

• 3-State Buffer-Type Outputs Drive Bus

Lines Directly

• Bus-Structured Pinout

• Choice of True or Inverting Logic

– SN54ALS874B, SN74ALS874B,

SN74AS874 Have True Outputs

– SN74ALS876A, SN74AS876 Have

Inverting Outputs

• Asynchronous Clear

• Package Options Include Plastic

Small-Outline (DW) Packages, Plastic (FN) and Ceramic (FK) Chip Carriers, and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs

description

These dual 4-bit D-type edge-triggered flip-flops feature 3-state outputs designed specifically as bus drivers. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.

The edge-triggered flip-flops enter data on the low-to-high transition of the clock (CLK) input. The SN54ALS874B, SN74ALS874B, and SN74AS874 have clear (CLR noninverting Q outputs. The SN74ALS876A and SN74AS876 have preset (PRE inverting Q four Q or Q

outputs; taking PRE low causes the

outputs to go low independently of the

clock. The SN54ALS874B is characterized for operation

over the full military temperature range of –55°C to 125°C. The SN74ALS874B, SN74ALS876A, SN74AS874, and SN74AS876 devices are characterized for operation from 0°C to 70°C.

) inputs and

SN74ALS874B, SN74AS874 . . . DW OR NT PACKAGE

SN74ALS876A, SN74AS876 . . . DW OR NT PACKAGE

SN54ALS874B ...JT PACKAGE

(TOP VIEW)

1 2 3 4 5 6 7 8 9 10 11 12

1CLR

NC

28 27 26

15 16 17 18

NC

GND

1 2 3 4 5 6 7 8 9 10 11 12

24 23 22 21 20 19 18 17 16 15 14 13

CC

V

2CLR

24 23 22 21 20 19 18 17 16 15 14 13

1CLR

1OE

1D1 1D2 1D3 1D4 2D1 2D2 2D3 2D4

2OE

GND

SN54ALS874B . . . FK PACKAGE

1D2

5

1D3

6

1D4

7

NC

8

2D1

9

2D2

10

2D3

11

NC – No internal connection

4

12

1D1

13 14

2D4

(TOP VIEW)

1OE

321

2OE

(TOP VIEW)

1PRE

1OE

1D1 1D2 1D3 1D4 2D1 2D2 2D3 2D4

2OE

GND

V

CC

1CLK 1Q1 1Q2 1Q3 1Q4 2Q1 2Q2 2Q3 2Q4 2CLK 2CLR

1CLK

1Q1

2Q4

2CLK

V

CC

1CLK 1Q 1Q 1Q3 1Q 2Q 2Q 2Q3 2Q 2CLK 2PRE

25 24 23 22 21 20 19

1 2

4 1 2

4

1Q2 1Q3 1Q4 NC 2Q1 2Q2 2Q3

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.

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Copyright  1995, Texas Instruments Incorporated

1

SN54ALS874B, SN74ALS874B, SN74ALS876A SN74AS874, SN74AS876 DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SDAS061C – APRIL 1982 – REVISED JANUARY 1995

Function Tables

logic symbols

SN54ALS874B, SN74ALS874B, SN74AS874

OE CLR CLK D

L L X X L L H ↑ HH LH↑LL LHLX Q

HXXX Z

OE PRE CLK D

L L X X L L H ↑ HL LH↑LH LHLX Q

HXXX Z

(each flip-flop)

INPUTS

SN74ALS876A, SN74AS876

(each flip-flop)

INPUTS

OUTPUT

Q

0

Q

0

†

SN74ALS876A, SN74AS876

2

1OE

1D1 1D2 1D3 1D4

2OE

2D1 2D2 2D3 2D4

23 1

3 4 5 6

11 14 13

7 8 9 10

1CLK 1CLR

2CLK 2CLR

†

These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the DW, JT, and NT packages.

EN

R

1D

EN

R

1D

C1

22 21 20 19

18 17 16 15

1CLK 1PRE

1Q1 1Q2 1Q3 1Q4

2CLK 2PRE

2Q1 2Q2 2Q3 2Q4

1OE

1D1 1D2 1D3 1D4

2OE

2D1 2D2 2D3 2D4

2 23 1

3 4 5 6

11 14 13

7 8 9 10

EN

S

1D

EN

S

1D

C1

22 21 20 19

18 17 16 15

1Q1 1Q 1Q 1Q

2Q 2Q 2Q

2Q

2 3 4

1 2 3

4

2

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logic diagrams (positive logic)

SN54ALS874B, SN74ALS874B, SN74ALS876A

SN74AS874, SN74AS876

DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SDAS061C – APRIL 1982 – REVISED JANUARY 1995

SN54ALS874B, SN74ALS874B, SN74AS874

OE

CLK

CLR

D1

D2

D3

D4

(each quad flip-flop)

R

C1

1D

R

C1

1D

R

C1

1D

R

C1

1D

Q1

Q2

Q3

Q4

OE

CLK

PRE

D1

D2

D3

D4

SN74ALS876A, SN74AS876

(each quad flip-flop)

S

C1

1D

S

C1

1D

S

C1

1D

S

C1

1D

Q

1

Q

2

Q

3

Q

4

Pin numbers shown are for the DW, JT, and NT packages.

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

Supply voltage, V Input voltage, V

Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

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.

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

: SN54ALS874B –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .

A

SN74ALS874B, SN74ALS876A 0°C to 70°C. . . . . . . . . . . . . . . . .

†

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3

SN54ALS874B, SN74ALS874B, SN74ALS876A

t

S

CLK↑

ns

V

4.5 V

VOLV

4.5 V

V

I

mA

SN74AS874, SN74AS876 DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SDAS061C – APRIL 1982 – REVISED JANUARY 1995

recommended operating conditions

V

CC

V

IH

V

IL

I

OH

I

OL

f

clock

t

w

su

t

h

T

A

Supply voltage 4.5 5 5.5 4.5 5 5.5 V High-level input voltage 2 2 V Low-level input voltage 0.7 0.8 V High-level output current –1 –2.6 mA Low-level output current 12 24 mA Clock frequency 0 25 0 30 MHz

PRE or CLR low 15 10

Pulse duration

etup time before

Hold time, data after CLK↑ 4 0 ns Operating free-air temperature –55 125 0 70 °C

CLK high 20 16.5 CLK low 20 16.5 Data 15 15 PRE or CLR inactive 15 10

SN54ALS874B

MIN NOM MAX MIN NOM MAX

SN74ALS874B SN74ALS876A

UNIT

ns

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

PARAMETER TEST CONDITIONS

V

IK

V

OH

I

OZH

I

OZL

I

IH

I

IL

‡

I

O

′ALS874B VCC = 5.5 V

CC

SN74ALS876A VCC = 5.5 V

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC –2 VCC –2

=

CC

=

CC

VCC = 5.5 V, VO = 2.7 V 20 20 µA VCC = 5.5 V, VO = 0.4 V –20 –20 µA VCC = 5.5 V, VI = 7 V 0.1 0.1 mA VCC = 5.5 V, VI = 2.7 V 20 20 µA VCC = 5.5 V, VI = 0.4 V –0.2 –0.2 mA VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA

IOH = –1 mA 2.4 3.3 IOH = –2.6 mA 2.4 3.2 IOL = 12 mA 0.25 0.4 0.25 0.4 IOL = 24 mA 0.35 0.5

Outputs high 14 21 14 21 Outputs low 19 30 19 30 Outputs disabled 20 32 20 32 Outputs high 14 21 Outputs low 18 29 Outputs disabled 20 31

SN54ALS874B

MIN TYP†MAX MIN TYP†MAX

SN74ALS874B SN74ALS876A

UNIT

V

4

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SN54ALS874B, SN74ALS874B, SN74ALS876A

CLK

A

Q

ns

OE

A

Q

ns

OE

A

Q

ns

CLK

A

Q

ns

OE

A

Q

ns

OE

A

Q

ns

SN74AS874, SN74AS876

DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SDAS061C – APRIL 1982 – REVISED JANUARY 1995

switching characteristics (see Figure 1)

VCC = 4.5 V to 5.5 V, CL = 50 pF,

PARAMETER

f

max

t

PLH

t

PHL

t

PHL

t

PZH

t

PZL

t

PHZ

t

†

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

PLZ

FROM

(INPUT)

CLR

TO

(OUTPUT)

ny

Any Q

ny

switching characteristics (see Figure 1)

PARAMETER

f

max

t

PLH

t

PHL

t

PHL

t

PZH

t

PZL

t

PHZ

t

†

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

PLZ

FROM

(INPUT)

PRE

TO

(OUTPUT)

ny

Any Q

ny

R1 = 500 Ω R2 = 500 Ω, TA = MIN to MAX

SN54ALS874B SN74ALS874B

MIN MAX MIN MAX

25 30 MHz

4 18 4 14 4 16 4 14 5 23 5 17 ns 4 24 4 18 4 21 4 18 2 15 2 10 3 22 3 12

VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω R2 = 500 Ω, TA = MIN to MAX

SN74ALS876A

,

†

,

†

MIN MAX

30 MHz

4 14 4 14 6 19 ns 4 18 4 18 2 10 3 13

UNIT

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

Supply voltage, V Input voltage, V Operating free-air temperature range, T

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

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.

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC

7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

: SN74AS874, SN74AS876 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . .

A

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‡

5

SN54ALS874B, SN74ALS874B, SN74ALS876A

UNIT

t

S

CLK↑

ns

V

I

V

5.5 V

V

0.4 V

mA

I

mA

SN74AS874, SN74AS876 DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS

SDAS061C – APRIL 1982 – REVISED JANUARY 1995

recommended operating conditions

V

CC

V

IH

V

IL

I

OH

I

OL

f

clock

t

w

su

t

h

T

A

Supply voltage 4.5 5 5.5 4.5 5 5.5 V High-level input voltage 2 2 V Low-level input voltage 0.8 0.8 V High-level output current –15 –15 mA Low-level output current 48 48 mA Clock frequency 0 125 0 80 MHz

PRE or CLR low 2 4.5

Pulse duration

etup time before

Hold time, data after CLK↑ 1 2 ns Operating free-air temperature 0 70 0 70 °C

CLK high CLK low 4 6.2 Data 2 4.5 PRE or CLR inactive 4 5

SN74AS874 SN74AS876

MIN NOM MAX MIN NOM MAX

3 6.2

ns

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

SN74AS874

PARAMETER TEST CONDITIONS

V

IK

OH

V

OL

I

OZH

I

OZL

I

IH

IL

I

O

CC

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

D All others

‡

SN74AS874 VCC = 5.5 V

SN74AS876 VCC = 5.5 V

VCC = 4.5 V, II = –18 mA –1.2 V VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC –2 VCC = 4.5 V, IOH = –15 mA 2.4 3.3 VCC = 4.5 V, IOL = 48 mA 0.35 0.5 V VCC = 5.5 V, VO = 2.7 V 50 µA VCC = 5.5 V, VO = 0.4 V –50 µA VCC = 5.5 V, VI = 7 V 0.1 mA VCC = 5.5 V, VI = 2.7 V 20 µA

,

=

CC

VCC = 5.5 V, VO = 2.25 V –30 –112 mA

=

I

Outputs high 82 133 Outputs low 92 149 Outputs disabled 100 160 Outputs high 88 142 Outputs low 94 150 Outputs disabled 100 160

SN74AS876

MIN TYP†MAX

–2

–0.5

UNIT

6

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