SN54ABT646A, SN74ABT646A

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3STATE OUTPUTS

SCBS069H − JULY 1991 − REVISED MAY 2004

6

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

TA = 25°C

SN54ABT646A

SN74ABT646A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

MAX

MIN

MAX

UNIT

VIK

VCC = 4.5 V,

II = −18 mA

−1.2

−1.2

−1.2

V

VCC = 4.5 V,

IOH = −3 mA

2.5

2.5

2.5

VOH

VCC = 5 V,

IOH = −3 mA

3

3

3

V

VOH

VCC = 4.5 V

IOH = −24 mA

2

2

V

VCC = 4.5 V

IOH = −32 mA

2*

2

VOL

VCC = 4.5 V

IOL = 48 mA

0.55

0.55

V

VOL

VCC = 4.5 V

IOL = 64 mA

0.55*

0.55

V

Vhys

100

mV

II

Control inputs

VCC = 5.5 V, VI = VCC or GND

±1

±1

±1

A

II

A or B ports

VCC = 5.5 V, VI = VCC or GND

±100

±100

±100

µA

IOZH‡

VCC = 5.5 V,

VO = 2.7 V

10§

10§

10§

µA

IOZL‡

VCC = 5.5 V,

VO = 0.5 V

−10§

−10§

−10§

µA

Ioff

VCC = 0,

VI or VO ≤ 4.5 V

±100

±100

µA

ICEX

VCC = 5.5 V,

VO = 5.5 V

Outputs high

50

50

50

µA

IO¶

VCC = 5.5 V,

VO = 2.5 V

−50

−100

−180

−50

−180

−50

−180

mA

VCC = 5.5 V,

Outputs high

250

250

250

µA

ICC

VCC = 5.5 V,

IO = 0,

V = V

or GND

Outputs low

30

30

30

mA

ICC

IO = 0,

VI = VCC or GND Outputs disabled

250

250

250

µA

∆ICC#

VCC = 5.5 V, One input at 3.4 V,

Other inputs at VCC or GND

1.5

1.5

1.5

mA

Ci

Control inputs

VI = 2.5 V or 0.5 V

7

pF

Cio

A or B ports

VO = 2.5 V or 0.5 V

12

pF

* On products compliant to MIL-PRF-38535, this parameter does not apply.

† All typical values are at VCC = 5 V.

‡ The parameters IOZH and IOZL include the input leakage current.

§ This data-sheet limit may vary among suppliers.

¶ Not more than one output should be tested at a time, and the duration of the test should not exceed one second.

# This is the increase in supply current for each input that is at the specified TTL voltage level, rather than VCC or GND.

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 2)

SN54ABT646A

VCC = 5 V,

TA = 25°C

MIN

MAX

UNIT

MIN

MAX

MIN

MAX

fclock

Clock frequency

125

125

MHz

tw

Pulse duration, CLK high or low

4

4

ns

tsu

Setup time, A or B before CLKAB

↑ or CLKBA↑

3

3.5

ns

th

Hold time, A or B after CLKAB

↑ or CLKBA↑

1.5

1.5

ns