54ACT16646, 74ACT16646

16-BIT BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCAS127B – MARCH 1990 – REVISED APRIL 1996

7

POST OFFICE BOX 655303

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

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C

54ACT16646

74ACT16646

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

IOH =50 mA

4.5 V

4.4

4.4

4.4

IOH = –50 mA

5.5 V

5.4

5.4

5.4

V

IOH =24 mA

4.5 V

3.94

3.7

3.8

V

VOH

IOH = –24 mA

5.5 V

4.94

4.7

4.8

V

IOH = –50 mA{

5.5 V

3.85

IOH = –75 mA{

5.5 V

3.85

IOL =50 mA

4.5 V

0.1

0.1

0.1

IOL = 50 mA

5.5 V

0.1

0.1

0.1

V

IOL =24mA

4.5 V

0.36

0.5

0.44

V

VOL

IOL = 24 mA

5.5 V

0.36

0.5

0.44

V

IOL = 50 mA{

5.5 V

1.65

IOL = 75 mA{

5.5 V

1.65

II

Control inputs

VI = VCC or GND

5.5 V

±0.1

±1

±1

mA

IOZ

A or B ports}

VO = VCC or GND

5.5 V

±0.5

±10

±5

mA

ICC

VI = VCC or GND,

IO = 0

5.5 V

8

160

80

mA

DICCw

One input at 3.4 V,

Other inputs at GND or VCC

5.5 V

0.9

1

1

mA

Ci

Control inputs

VI = VCC or GND

5 V

4

pF

Cio

A or B ports

VO = VCC or GND

5 V

12

pF

† Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.

‡ For I/O ports, the parameter IOZ includes the input leakage current.

§ This is the increase in supply current for each input that is at one of the specified TTL voltage levels rather than 0 V or VCC.

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

temperature, (unless otherwise noted) (see Figure 2)

TA = 25°C

54ACT16646

74ACT16646

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

0

90

0

90

0

90

MHz

tw

Pulse duration, CLKAB or CLKBA high or low

5.5

5.5

5.5

ns

t

Set p time A before CLKAB

↑ or B before CLKBA↑

Data high

4

4

4

ns

tsu

Setup time, A before CLKAB

↑ or B before CLKBA↑

Data low

6

6

6

ns

th

Hold time, A before CLKAB

↑ or B before CLKBA↑

1.5

1.5

1.5

ns

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other specifications

are design goals. Texas Instruments reserves the right to change or

discontinue these products without notice.