SN54AS856, SN74AS856

8BIT UNIVERSAL TRANSCEIVER PORT CONTROLLERS

SDAS032A − DECEMBER 1983 − REVISED MARCH 1985

POST OFFICE BOX 655303

6

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54AS856

SN74AS856

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = − 18 mA

− 1.2

− 1.2

V

A1-A8

VCC = 4.5 V,

IOH = − 12 mA

2

3.2

VOH

B1-B8

VCC = 4.5 V,

IOH = − 15 mA

2

3.3

V

All outputs

VCC = 4.5 V to 5.5 V,

IOH = − 2 mA

VCC −2

VCC −2

All outputs

VCC = 4.5 V,

IOL = 32 mA

0.25

0.5

VOL

except Q8

VCC = 4.5 V,

IOL = 48 mA

0.35

0.5

V

Q8

VCC = 4.5 V,

IOL = 20 mA

0.5

0.5

OEB, OEA, MODE

VCC = 5.5 V,

VI = 7 V

0.2

0.2

II

CLK and SERIN

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

A1-A8, B1-B8

VCC = 5.5 V,

VI = 5.5 V

0.2

0.2

OEB, OEA, MODE

40

40

IIH

CLK and SERIN

VCC = 5.5 V,

VI = 2.7 V

20

20

µA

A1-A8, B1-B8‡

70

70

OEB, OEA, MODE

−1

−1

IIL

CLK and SERIN

VCC = 5.5 V,

VI = 0.4 V

− 0.5

− 0.5

mA

A1-A8, B1-B8‡

− 0.5

− 0.5

IO§

Except Q8

VCC = 5.5 V,

VO = 2.25 V

−30

−112

−30

−112

mA

IO§

Q8

VCC = 5.5 V,

VO = 2.25 V

−20

−112

−20

−112

mA

ICC

VCC = 5.5 V

118

200

118

200

mA

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

‡ For I/O ports, the parameters III and IIL include the output currents IOZH and IOZL, respectively.

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