SN54173, SN54LS173A, SN74173, SN74LS173A

4-BIT D-TYPE REGISTERS

WITH 3-STATE OUTPUTS

SDLS067A – OCTOBER 1976 – REVISED JUNE 1999

7

POST OFFICE BOX 655303

recommended operating conditions

SN54LS173A

SN74LS173A

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.75

5

5.25

V

IOH

High-level output current

–1

–2.6

mA

IOL

Low-level output current

12

24

mA

TA

Operating free-air temperature

–55

125

0

70

°C

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

otherwise noted)

PARAMETER

TEST CONDITIONS†

SN54LS173A

SN74LS173A

UNIT

PARAMETER

TEST CONDITIONS†

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.7

0.8

V

VIK

Input clamp voltage

VCC = MIN,

II = –18 mA

–1.5

–1.5

V

VOH

High-level output voltage

VCC = MIN,

VIL = VILmax,

VIH = 2 V,

IOH = MAX

2.4

3.4

2.4

3.1

V

VOL

Low level output voltage

VCC = MIN,

IOL = 12 mA

0.25

0.4

0.25

0.4

V

VOL

Low-level output voltage

CC

,

VIL = 0.8 V,

IOL = 24 mA

0.35

0.5

V

IO( ff)

Off-state (high-impedance state)

VCC = MAX,

VO = 2.7 V

20

20

V

IO(off)

(g

)

output current

CC

,

VIH = 2 V

VO = 0.4 V

–20

–20

V

II

Input current

at maximum input voltage

VCC = MAX,

VI = 7 V

0.1

0.1

mA

IIH

High-level input current

VCC = MAX,

VI = 2.7 V

20

20

µA

IIL

Low-level input current

VCC = MAX,

VI = 0.4 V

–0.4

–0.4

mA

IOS

Short-circuit output current§

VCC = MAX

–30

–130

–30

–130

mA

ICC

Supply current

VCC = MAX,

See Note 4

19

30

19

24

mA

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

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

§ Not more than one output should be shorted at a time.

NOTE 4: ICC is measured with all outputs open; CLR grounded, following momentary connection to 4.5 V, N, G1, G2, and all data inputs grounded;

and CLK and M at 4.5 V.

timing requirements over recommended operating conditions (unless otherwise noted)

SN54LS173A

SN74LS173A

UNIT

MIN

MAX

MIN

MAX

UNIT

fclock

Input clock frequency

30

25

MHz

tw

Pulse duration

CLK or CLR

25

25

ns

Data enable (G1, G2)

35

35

tsu

Setup time

Data

17

17

ns

CLR (inactive state)

10

10

th

Hold time

Data enable (G1, G2)

0

0

ns

th

Hold time

Data

3

3

ns