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74LVT16646ADL,512

3.3 V 16-bit bus transceiver; 3-state

NXP Semiconductors. 

Philips Semiconductors

74LVT16646A

3.3 V 16-bit bus transceiver; 3-state

Table 3:

Symbol

VCC

1B1

1B0

GND

1SBA

1CPBA

1OE

Pin description …continued

Pin

Description

50

positive supply voltage

51

data input or output 1; B side

52

data input or output 0; B side

53

ground (0V)

54

select inputs 0 to 7; B to A side

55

clock inputs 0 to 7; B to A side

56

output enable inputs 0 to 7

7. Functional description

7.1 Function table

Table 4: Function table [1]

Operating mode

Inputs

nOE nDIR nCPAB

Store A (B unspecified)

XX

↑

nCPBA

X

nSAB

X

nSBA

X

Data I/O

nAx

input

Store B (A unspecified)

XX

X

↑

X

Store A and B data

HX

↑

↑

X

Isolation, hold storage

H X H or L H or L X

Real time B data to A bus

L

L

X

X

X

Stored B data to A bus

L

L

X

H or L X

Real time A data to B bus

L

H

X

X

L

Stored A data to B bus

L H H or L

X

H

X unspecified

output [2]

X input

X input

L output

H output

X input

X input

nBx

unspecified

output [2]

input

input

input

input

input

output

output

reference

Figure 5c

Figure 5c

Figure 5c

-

Figure 5a

Figure 5d

Figure 5b

Figure 5d

[1] H = HIGH voltage level;

L = LOW voltage level;

X = don’t care;

↑ = LOW-to-HIGH clock transition.

[2] The data output function may be enabled or disabled by various signals at the nOE input. Data input functions are always enabled, i.e.

data at the bus pins will be stored on every LOW-to-HIGH transition of the clock.

9397 750 14326

Product data sheet

Rev. 03 — 12 January 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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