SN54AS878, SN54AS879

SN74AS878, SN74AS879

DUAL 4BIT DTYPE EDGETRIGGERED FLIPFLOPS WITH 3STATE OUTPUTS

SDAS062A − D2661, APRIL 1982 − REVISED MAY 1986

POST OFFICE BOX 655303

POST OFFICE BOX 1443

7

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

otherwise noted)

SN54AS878

SN74AS878

PARAMETER

TEST CONDITIONS

SN54AS879

SN74AS879

UNIT

MIN

TYP‡

MAX

MIN

TYP‡

MAX

UNIT

VIK

VCC = 4.5 V,

II = − 18 mA

− 1.2

− 1.2

V

VCC = 4.5 V to 5.5 V,

IOH = − 2 mA

VCC −2

VCC −2

VOH

VCC = 4.5 V,

IOH = − 12 mA

2.4

3.2

V

VCC = 4.5 V,

IOH = − 15 mA

2.4

3.3

VOL

VCC = 4.5 V,

IOL = 32 mA

0.29

0.5

V

VOL

VCC = 4.5 V,

IOL = 48 mA

0.33

0.5

V

IOZH

VCC = 5.5 V,

VO = 2.7 V

50

50

µA

IOZL

VCC = 5.5 V,

VO = 0.4 V

−50

−50

µA

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

IIL

D

VCC = 5.5 V,

VI = 0.4 V

−3

−2

mA

IIL

All other

VCC = 5.5 V,

VI = 0.4 V

− 0.5

− 0.5

mA

IO‡

VCC = 5.5 V,

VO= 2.25 V

−30

−112

−30

−112

mA

Outputs high

82

132

82

132

’AS878

Outputs low

96

155

96

155

ICC

VCC = 5.5 V,

Outputs disabled

100

160

100

160

mA

ICC

See Note 2

Outputs high

88

142

88

142

mA

’AS879

Outputs low

94

150

94

150

Outputs disabled

100

160

100

160

† 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.

NOTE 2: ICC is measured with CLR and all D inputs grounded, and CLK and OC at 4.5 V.

switching characteristics (see Note 1)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500

FROM

TO

R2 = 500

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

TA = MIN to MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

SN54AS878

SN54AS879

SN74AS878

SN74AS879

UNIT

MIN

MAX

MIN

MAX

tmax

100

125

MHz

tPLH

CLK

Q or Q

3

11.5

3

8.5

ns

tPHL

CLK

Q or Q

4

12.5

4

10.5

ns

tPZH

OC

Q or Q

2

8

2

7

ns

tPZL

OC

Q or Q

3

11.5

3

10.5

ns

tPHZ

OC

Q or Q

2

7

2

6

ns

tPLZ

OC

Q or Q

2

7

2

6

ns

NOTE 1: Load circuit and voltage waveforms are shown in Section 1.