Philips mb2646 DATASHEETS

Philips Semiconductors Products

Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

1

August 23, 1993 853-1617 10589

FEATURES

•Independent registers for A and B buses

•Multiple V

CC

and GND pins minimize

switching noise

•Live insertion/extraction permitted

•Power-up 3-State

•Power-up reset

•Multiplexed real-time and stored data

•Outputs sink 64mA and source 32mA

•Latch-up protection exceeds 500mA per

Jedec JC40.2 Std 17

•ESD protection exceeds 2000V per MIL

STD 883 Method 3015 and 200V per
Machine Model

DESCRIPTION

The MB2646 high-performance BiCMOS
device combines low static and dynamic
power dissipation with high speed and high
output drive.

The MB2646 dual 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.

QUICK REFERENCE DATA

SYMBOL PARAMETER

CONDITIONS

T

amb

= 25°C; GND = 0V

TYPICAL UNIT

t

PLH

t

PHL

Propagation delay
nAx to nBx

CL = 50pF; VCC = 5V 3.2 ns

C

IN

Input capacitance VI = 0V or V

CC

4 pF

C

I/O

I/O capacitance VO = 0V or VCC; 3-State 7 pF

I

CCZ

Total supply current Outputs disabled; VCC = 5.5V 500 µA

ORDERING INFORMATION

PACKAGES TEMPERATURE RANGE ORDER CODE DRAWING NUMBER

52-pin plastic Quad Flat Pack -40°C to +85°C MB2646BB 1418B

PIN CONFIGURATION LOGIC SYMBOL

Vcc Vcc

19 2220 231716 25 26241514 2118

1A2
1A3
1A4

GND

1A5
1A6
1A7
2A0
2A1
2A2
2A3
2A4
2A5

1
2

3
4

5
6
7
8

9
10
11
12
13

47 4446 434950 41 40425152 4548

1B2
1B3
1B4
1B5
1B6
1B7
2B0
2B1
2B2
GND
2B3
2B4
2B5

39
38
37
36

35
34
33
32
31
30
29
28
27

MB2646

52-pin PQFP

1A1

1A0

1SAB

1CPAB

1DIR

1OE

1CPBA

1SBA

GND

1B0

1B1

Vcc

2A6

2A7

GND

2SAB

2CPAB

2DIR

2OE

2CPBA

2SBA

2B7

2B6

Vcc

42 41 39 38 37 36 35 34

1B0 1B1 1B2 1B3 1B4 1B5 1B6 1B7

50 51 1 2 3 5 6 7

1A0 1A1 1A2 1A3 1A4 1A5 1A6 1A7

48
49

1CPAB

1SAB
47 1DIR
45 1CPBA

33 32 31 29 28 27 25 24

2B0 2B1 2B2 2B3 2B4 2B5 2B6 2B7

8 9 10 11 12 13 15 16

2A0 2A1 2A2 2A3 2A4 2A5 2A6 2A7
19

18

2CPAB

2SAB
20 2DIR
22 2CPBA

44 1SBA
46 1OE

23 2SBA
21 2OE

Philips Semiconductors Products Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

August 23, 1993

2

DESCRIPTION (continued)

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.

PIN DESCRIPTION

PIN NUMBER SYMBOL NAME AND FUNCTION

48, 45, 19, 22 1CPAB, 1CPBA, 2CPAB, 2CPBA Clock input A to B / Clock input B to A
49, 44, 18, 23 1SAB, 1SBA, 2SAB, 2SBA Select input A to B / Select input B to A

47, 20 1DIR, 2DIR Direction control inputs

50, 51, 1, 2, 3, 5, 6, 7,

8, 9, 10, 11, 12, 13, 15, 16

1A0 – 1A7,

2A0 – 2A7

Data inputs/outputs (A side)

42, 41, 39, 38, 37, 36, 35, 34,

33, 32, 31, 29, 28, 27, 25, 24

1B0 – 1B7,

2B0 – 2B7

Data inputs/outputs (B side)

46, 21 1OE, 2OE Output enable inputs

4, 17, 30, 43 GND Ground (0V)

14, 26, 40, 52 V

CC

Positive supply voltage

LOGIC SYMBOL (IEEE/IEC)

50

41

39

38

37

36

35

34

46

47
44
49
45
48

51

1

2

3

5

6

7

42

8

32

31

29

28

27

25

24

21

20
23
18
22
19

9

10

11

12

13

15

16

33

≥1

∇1

G3
3EN1 [BA]
3EN2 [AB]
G6
G7
C4
C5

5D 7
1 7

6 4D
6

1

≥1

2∇

≥1

∇1

G3
3EN1 [BA]
3EN2 [AB]
G6
G7
C4
C5

5D 7
1 7

6 4D
6

1

≥1

2∇

Philips Semiconductors Products Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

August 23, 1993

3

The following examples demonstrate the four
fundamental bus-management functions that
can be performed with the MB2646.

}

REAL TIME BUS TRANSFER

BUS B TO BUS A

nOE nDIR nCPAB nCPBA nSAB nSBA

L L X X X L

}

REAL TIME BUS TRANSFER

BUS A TO BUS B

nOE nDIR nCPAB nCPBA nSAB nSBA

L H X X L X

}

STORAGE FROM

A, B, OR A AND B

nOE nDIR nCPAB nCPBA nSAB nSBA

L H ↑ X X X
L L X ↑ X X
H X ↑ ↑ X X

}

TRANSFER STORED DATA

TO A OR B

nOE nDIR nCPAB nCPBA nSAB nSBA

L L X H | L X H
L H H | L X H X

A B A B A B

A B

Philips Semiconductors Products Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

August 23, 1993

4

LOGIC DIAGRAM

1D

C1

Q

nB1
nB2
nB3
nB4
nB5
nB6
nB7

nA1
nA2
nA3
nA4
nA5
nA6
nA7

DETAIL A X 7

nOE

nDIR

nCPBA

nSBA

nCPAB

nSAB

nB0

1D

C1

Q

nA0

1of 8 Channels

FUNCTION TABLE

INPUTS DATA I/O OPERATING MODE

nOE nDIR nCPAB nCPBA nSAB nSBA nAx nBx

X X ↑ X X X Input

Unspecified

output*

Store A, B unspecified

X X X ↑ X X

Unspecified

output*

Input Store B, A unspecified

H
H

X
X

↑

H or L

↑

H or L

X
X

X
X

Input Input

Store A and B data
Isolation, hold storage

L
L

L
L

X
X

X

H or L

X
X

L
H

Output Input

Real time B data to A bus
Stored B data to A bus

L
L

H
H

X

H or L

X
X

L
H

X
X

Input Output

Real time A data to B bus
Stored A data to B bus

H = High voltage level
L = Low voltage level
X = Don’t care
↑ = Low-to-High clock transition
* 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.

Philips Semiconductors Products Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

August 23, 1993

5

ABSOLUTE MAXIMUM RATINGS

1, 2

SYMBOL

PARAMETER CONDITIONS RATING UNIT

V

CC

DC supply voltage –0.5 to +7.0 V

I

IK

DC input diode current VI < 0 –18 mA

V

I

DC input voltage

3

–1.2 to +7.0 V

I

OK

DC output diode current VO < 0 –50 mA

V

OUT

DC output voltage

3

output in Off or High state –0.5 to +5.5 V

I

OUT

DC output current output in Low state 128 mA

T

stg

Storage temperature range –65 to 150 °C

NOTES:

1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.

2. The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150°C.

3. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER LIMITS UNIT

MIN MAX

V

CC

DC supply voltage 4.5 5.5 V

V

I

Input voltage 0 V

CC

V

V

IH

High-level input voltage 2.0 V

V

IL

Low-level Input voltage 0.8 V

I

OH

High-level output current –32 mA

I

OL

Low-level output current 64 mA

∆t/∆v Input transition rise or fall rate 0 10 ns/V

T

amb

Operating free-air temperature range –40 +85 °C