Philips Semiconductors

Product specification

74ABT16646

74ABTH16646

16-bit bus transceiver/register (3-State)

2

1998 Feb 27

853-1782 19026

FEATURES

the need for external pull-up resistors to hold unused inputs

and 200V per Machine Model

DESCRIPTION

The 74ABT16646 high–performance BiCMOS device combines low

static and dynamic power dissipation with high speed and high

output drive.

The 74ABT16646 16-bit transceiver/register consists of two sets of

bus transceiver circuits with 3-State outputs, D-type flip-flops, and

control circuitry arranged for multiplexed transmission of data

directly from the input bus or from the internal registers. Data on the

A or B bus will be clocked into the registers as the appropriate clock

pin goes High. Output Enable (nOE) and Direction (nDIR) pins are

provided to control the transceiver function. In the transceiver mode,

data present at the high impedance port may be stored in either the

A or B register or both.

The select (nSAB, nSBA) pins determine whether data is stored or

transferred through the device in real-time. The nDIR determines

which bus will receive data when the nOE is active Low. In the

isolation mode (nOE = High), data from Bus A may be stored in the

B register and/or data from Bus B may be stored in the A register.

When an output function is disabled, the input function is still

enabled and may be used to store and transmit data. Only one of

the two buses, A or B may be driven at a time.

Two options are available, 74ABT16646 which does not have the

bus-hold feature and 74ABTH16646 which incorporates the

bus-hold feature.

QUICK REFERENCE DATA

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

Propagation delay

nAx to nBx

3.3

2.7

ns

Input capacitance

3

pF

I/O capacitance

7

pF

Quiescent supply current

550

µA

Quiescent supply current

9

mA

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

OUTSIDE NORTH AMERICA

NORTH AMERICA

DWG NUMBER

56-Pin Plastic SSOP Type III

–40

°C to +85°C

74ABT16646 DL

BT16646 DL

SOT371-1

56-Pin Plastic TSSOP Type II

–40

°C to +85°C

74ABT16646 DGG

BT16646 DGG

SOT364-1

56-Pin Plastic SSOP Type III

–40

°C to +85°C

74ABTH16646 DL

BH16646 DL

SOT371-1

56-Pin Plastic TSSOP Type II

–40

°C to +85°C

74ABTH16646 DGG

BH16646 DGG

SOT364-1

PIN DESCRIPTION

PIN NUMBER

SYMBOL

NAME AND FUNCTION

2, 55, 27, 30

1CPAB, 1CPBA, 2CPAB, 2CPBA

Clock input A to B / Clock input B to A

3, 54, 26, 31

1SAB, 1SBA, 2SAB, 2SBA

Select input A to B / Select input B to A

1, 28

1DIR, 2DIR

Direction control inputs

5, 6, 8, 9, 10, 12, 13, 14

15, 16, 17, 19, 20, 21, 23, 24

1A0 – 1A7,

2A0 – 2A7

Data inputs/outputs (A side)

52, 51, 49, 48, 47, 45, 44, 43

42, 41, 40, 38, 37, 36, 34, 33

1B0 – 1B7,

2B0 – 2B7

Data inputs/outputs (B side)

56, 29

1OE, 2OE

Output enable inputs

4, 11, 18, 25, 32, 39, 46, 53

GND

Ground (0V)

7, 22, 35, 50

Positive supply voltage