Philips 74ABT2953PW, 74ABT2953DB, 74ABT2953D Datasheet

Philips Semiconductors Product specification

74ABT2953Octal registered transceiver, inverting (3-State)

1

1995 Sep 06 853-1555 15702

FEA TURES

•8-bit registered transceiver

•Independent registers for A and B buses

•Output capability: +64mA/–32mA

•Latch-up protection exceeds 500mA per Jedec Std 17

•ESD protection exceeds 2000V per MIL STD 883 Method 3015

and 200V per Machine Model

•Live insertion/extraction permitted

•Power-up 3-State

•Power-up reset

DESCRIPTION

The 74ABT2953 high-performance BiCMOS device combines low
static and dynamic power dissipation with high speed and high
output drive.

The 74ABT2953 device is an 8-bit registered inverting transceiver.
Two 8-bit back-to-back registers store data flowing in both directions
between two bidirectional buses. Data applied to the inputs is
entered and stored on the rising edge of the Clock (CPXX) provided
that the Clock Enable (CEXX

) is Low. The data is then present at
the 3-State output buffers, but is only accessible when the Output
Enable (OEXX

) is Low. Data flow from A inputs to B outputs is the

same as for B inputs to A outputs.

QUICK REFERENCE DAT A

SYMBOL PARAMETER

CONDITIONS

T

amb

= 25°C; GND = 0V

TYPICAL UNIT

t

PLH

t

PHL

Propagation delay
CPBA to A

n or CPAB to Bn

CL = 50pF; VCC = 5V 5.0 ns

C

IN

Input capacitance VI = 0V or V

CC

4 pF

C

I/O

I/O capacitance

Outputs disabled;
V

O

= 0V or V

CC

7 pF

I

CCZ

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

ORDERING INFORMATION

PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA DWG NUMBER

24-Pin Plastic DIP –40°C to +85°C 74ABT9253 N 74ABT2953 N SOT222-1
24-Pin plastic SO –40°C to +85°C 74ABT2953 D 74ABT2953 D SOT137-1
24-Pin Plastic SSOP Type II –40°C to +85°C 74ABT2953 DB 74ABT2953 DB SOT340-1
24-Pin Plastic TSSOP Type I –40°C to +85°C 74ABT2953 PW 74ABT2953PW DH SOT355-1

PIN CONFIGURA TION

1
2
3
4
5
6
7
8
9

10 15

16

17

18

19

20

21

22

23

24

B7
B6
B5
B4
B3
B2
B1
B0

OEAB

A0

CPAB

A1

A2

A3

A4

A5

A6

A7

V

CC

OEBA

11 14CEAB

CPBA

12 13GND

CEBA

TOP VIEW

SA00305

PIN DESCRIPTION

PIN NUMBER SYMBOL NAME AND FUNCTION

10, 14

CPAB /

CPBA

Clock input A to B / Clock input
B to A

11, 13

CEAB /

CEBA

Clock enable input A to B / Clock
enable input B to A

16, 17, 18, 19,

20, 21, 22, 23

A0 – A7 Data inputs/outputs (A side)

1, 2, 3, 4, 5, 6,

7, 8

B0 – B7 Data outputs/outputs (B side)

9, 15

OEAB /

OEBA

Output enable inputs

12 GND Ground (0V)
24 V

CC

Positive supply voltage

Philips Semiconductors Product specification

74ABT2953Octal registered transceiver, inverting (3-State)

1995 Sep 06

2

LOGIC SYMBOL

16 17 18 19 20 21 22 23

A0 A1 A2 A3 A4 A5 A6 A7

B0 B1 B2 B3 B4 B5 B6 B7

87654321

15

9

10

14

11

13

CPAB

CPBA

CEAB

CEBA

OEBA
OEAB

SA00306

LOGIC SYMBOL (IEEE/IEC)

C6

1, 4, 5

14

16 8
17 7
18 6
19 5
20 4
21 3
22 2
23 1

2, 3, 6

C5

10

EN4

9

EN3

15

EN2

13

EN1

11

SA00307

FUNCTION TABLE for Register An or Bn

INPUTS INTERNAL OPERATING

An or

Bn

CPXX CEXX Q MODE

X X H NC Hold data
L

H

↑
↑

L
L

L
H

Load data

H = High voltage level
L =Low voltage level
↑ =Low-to-High transition
X = Don’t care
XX=AB or BA
NC=No change

FUNCTION TABLE for Output Enable

INPUTS INTERNAL An or Bn OPERATING

OEXX Q OUTPUTS MODE

H X Z Disable outputs
L

L

L
H

H
L

Enable outputs

H = High voltage level
L =Low voltage level
X = Don’t care
XX=AB or BA
Z =High impedance ”off” state

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.