Datasheet SN64BCT25245DW, SN64BCT25245DWR, SN64BCT25245NT Datasheet (Texas Instruments)

SN64BCT25245

25-Ω OCT AL BUS TRANSCEIVER

SCBS060A – JUNE 1990 – REVISED DECEMBER 1993

Copyright  1993, Texas Instruments Incorporated

3–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

• Designed to Facilitate Incident-Wave

Switching for Line Impedances of 25 Ω
or Greater

• Distributed V

CC

and GND Pins Minimize
Noise Generated by the Simultaneous
Switching of Outputs

• Data Flow-Through Pinout (All Inputs

on Opposite Side From Outputs)

• High-Impedance State During Power Up

and Power Down

• ESD Protection Exceeds 2000 V

Per MIL-STD-883C, Method 3015

• Package Options Include Plastic

Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)

description

The SN64BCT25245 is a 25-Ω octal bus transceiver designed for asynchronous communication between data
buses. It improves both the performance and density of 3-state memory address drivers, clock drivers, and
bus-oriented transceivers.

The device allows data transmission from the A bus to the B bus or from the B bus to the A bus depending upon
the logic level at the direction-control (DIR) input. The output-enable (OE) input can disable the device so that
both buses are effectively isolated.

This transceiver is capable of sinking 188-mA IOL, which facilitates switching 25-Ω transmission lines on the
incident wave. The distributed VCC and GND pins minimize switching noise for more reliable system operation.

The outputs are in a high-impedance state during power up and power down while the supply voltage is less
than approximately 3 V.

The SN64BCT25245 is characterized for operation from –40°C to 85°C and 0°C to 70°C.

FUNCTION TABLE

INPUTS

OE

DIR

OPERATION

L L B data to A bus
L H A data to B bus
H X Isolation

1
2
3
4
5
6
7
8
9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

A1

GND

A2
A3

GND

A4
A5

GND

A6
A7

GND

A8

DIR
B1
B2
V

CC

B3
B4
B5
B6
V

CC

B7
B8
OE

DW OR NT PACKAGE

(TOP VIEW)

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

SN64BCT25245
25-Ω OCT AL BUS TRANSCEIVER

SCBS060A – JUNE 1990 – REVISED DECEMBER 1993

3–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

logic diagram (positive logic)

B2

22

B3

20

B4

19

A5

7

A6

9

A7

10

A8

12

A2

3

A3

4

A4

6

OE

A1

1

G3

13

3EN2[AB]

B5

18

B6

17

B7

15

B8

14

B1

23

3EN1[BA]

24

DIR

DIR

OE

A1

B1

24

1

23

13

To Seven Other Channels

1

2

†

This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

‡

Supply voltage range, V

CC

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI (see Note 1): Control inputs –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O ports –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state, V

O

–0.5 V to 7 V. . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state, V

O

(B port) –0.5 V to V

CC

. . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, I

IK

–30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current into any output in the low state, IO: A port 376 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B port 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range –40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

Stresses beyond those listed under “absolute maximum ratings” 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.

NOTE 1: The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.

recommended operating conditions

MIN NOM MAX UNIT

V

CC

Supply voltage 4.5 5 5.5 V

V

IH

High-level input voltage 2 V

V

IL

Low-level input voltage 0.8 V

I

IK

Input clamp current –18 mA

p

A port –80

IOHHigh-level output current

B port –3

mA

p

A port 188

IOLLow-level output current

B port 24

mA

T

A

Operating free-air temperature –40 85 °C

SN64BCT25245

25-Ω OCT AL BUS TRANSCEIVER

SCBS060A – JUNE 1990 – REVISED DECEMBER 1993

3–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

V

IK

VCC = 4.5 V, II = –18 mA –1.2 V

p

VCC = 4.75 V , IOH = – 3 mA 2.7

V

OH

A port

VCC = 4.5 V, IOH = –80 mA 2

V

B port VCC = 4.5 V, IOH = –3 mA 2.4 3.3

p

IOL = 94 mA 0.42 0.55

V

OL

A port

V

CC

= 4.5

V

IOL = 188 mA 0.7

V

B port VCC = 4.5 V, IOL = 24 mA 0.35 0.5

p

p

VO = 2.7 V

70 µA

V

CC

=

0 to 2.3 V (power up)

VO = 0.5 V

OE

at 0.8

V

–0.6 mA

I

OZ

p

VO = 2.7 V

70 µA

V

CC

= 1.8 V to 0

(power down)

VO = 0.5 V

OE

at 0.8

V

–0.6 mA

A and B ports

0.25

I

I

DIR and OE

V

CC

= 0 to 5.5 V,

V

I

= 5.5

V

0.1

mA

A and B ports

70

I

IH

‡

DIR and OE

V

CC

= 5.5 V,

V

I

= 2.7

V

20

µ

A

A and B ports

I

IL

‡

DIR and OE

V

CC

=

5.5 V

,

V

I

=

0.5 V

–0.

6

mA

I

OS

§

B port

¶

VCC = 5.5 V, VO = 0 –60 –150 mA

A to B port

48 60

I

CCL

B to A port

V

CC

= 5.5

V

95 125

mA

A to B port

36 46

I

CCH

B to A port

V

CC

= 5.5

V

63 80

mA

I

CCZ

VCC = 5.5 V 12 16 mA

C

i

OE and DIR VCC = 5.5 V, VI = 2.5 V to 0.5 V 8 pF
A port

18

p

C

i

o

B port

V

CC

= 5.5 V,

V

I

= 2.5 V to 0.5

V

8

F

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

For I/O ports, the parameters IIH and IIL include the off-state outputs current.

§

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

¶

Testing for this parameter on the A port is not recommended.

SN64BCT25245
25-Ω OCT AL BUS TRANSCEIVER

SCBS060A – JUNE 1990 – REVISED DECEMBER 1993

3–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

switching characteristics (see Note 2)

FROM

TO

VCC = 5 V,
CL = 50 pF,
R1 = 500 Ω,

VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω

PARAMETER

(INPUT) (OUTPUT)

R2

=

500 Ω

,

TA = 25°C

TA = –40°C

to 85°C

TA = 0°C

to 70°C

UNIT

MIN TYP MAX MIN MAX MIN MAX

t

PLH

1.2 3.3 5.1 1.2 5.7 1.2 5.7

t

PHL

A

B

1.9 4.3 6.7 1.9 7.3 1.9 7.2

ns

t

PLH

1.2 3.3 4.8 1.2 5.5 1.2 5.5

t

PHL

B

A

2.1 4 5.6 2.1 6.3 2.1 6.2

ns

t

PZH

3.7 6.3 8.4 3.7 9.7 3.7 9.6

t

PZL

OE

A

4.5 7.4 9.2 4.5 10.6 4.5 10.3

ns

t

PHZ

1.8 3.7 5.5 1.8 6.2 1.8 6.2

t

PLZ

OE

A

3.3 5.1 7.2 3.3 8.8 3.3 8.3

ns

t

PZH

3.4 5.7 7.9 3.4 8.9 3.4 8.9

t

PZL

OE

B

4.3 6.6 8.7 4.3 9.9 4.3 9.7

ns

t

PHZ

2.7 4.5 6.3 2.7 6.9 2.7 6.9

t

PLZ

OE

B

1.7 4.5 6.8 1.7 7.7 1.7 7.5

ns

NOTE 2: Load circuits and voltage waveforms are shown in Section 1.

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