Philips 74abt2953 DATASHEETS

Philips Semiconductors Product specification

74ABT2953Octal registered transceiver, inverting (3-State)

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

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
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.

) is Low. The data is then present at

•Power-up reset

QUICK REFERENCE DAT A

SYMBOL PARAMETER

t

PLH

t

PHL

C

C

I

CCZ

IN

I/O

Propagation delay
CPBA to A

n or CPAB to Bn

CL = 50pF; VCC = 5V 5.0 ns

Input capacitance VI = 0V or V

I/O capacitance

Outputs disabled;

= 0V or V

V

O

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

CONDITIONS
= 25°C; GND = 0V

T

amb

CC

CC

TYPICAL UNIT

4 pF

7 pF

PIN CONFIGURA TION

PIN DESCRIPTION

PIN NUMBER SYMBOL NAME AND FUNCTION

1

B7

2

B6

3

B5

4

B4

5

B3

6

B2

7

B1

8

B0

9

OEAB

10 15

CPAB

11 14CEAB
12 13GND

TOP VIEW

1995 Sep 06 853-1555 15702

24

V

CC

23

A7

22

A6

21

A5

20

A4

19

A3

18

A2

17

A1

16

A0
OEBA
CPBA
CEBA

SA00305

1

10, 14

11, 13

16, 17, 18, 19,

20, 21, 22, 23

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

7, 8

9, 15

12 GND Ground (0V)
24 V

CPAB /

CPBA

CEAB /

CEBA

A0 – A7 Data inputs/outputs (A side)

B0 – B7 Data outputs/outputs (B side)

OEAB /

OEBA

CC

Clock input A to B / Clock input
B to A

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

Output enable inputs

Positive supply voltage

Philips Semiconductors Product specification

74ABT2953Octal registered transceiver, inverting (3-State)

LOGIC SYMBOL

16 17 18 19 20 21 22 23

A0 A1 A2 A3 A4 A5 A6 A7

10

CPAB

11

CEAB

14

CPBA

13

CEBA

B0 B1 B2 B3 B4 B5 B6 B7

87654321

OEBA
OEAB

FUNCTION TABLE for Register An or Bn

INPUTS INTERNAL OPERATING

An or

Bn

X X H NC Hold data
L

H

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

CPXX CEXX Q MODE

↑
↑

L
L

L

H

Load data

LOGIC SYMBOL (IEEE/IEC)

11
13
15

9

10
14

15

9

SA00306

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

EN1
EN2
EN3
EN4

C5
C6

2, 3, 6

1, 4, 5

SA00307

FUNCTION TABLE for Output Enable

INPUTS INTERNAL An or Bn OPERATING

OEXX Q OUTPUTS MODE

H X Z Disable outputs
L

L

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

L
H

H

L

Enable outputs

ABSOLUTE MAXIMUM RATINGS

SYMBOL

V

CC

I

IK

V

I

I

OK

V

OUT

I

OUT

T

stg

DC supply voltage –0.5 to +7.0 V
DC input diode current VI < 0 –18 mA
DC input voltage
DC output diode current VO < 0 –50 mA
DC output voltage
DC output current output in Low state 128 mA
Storage temperature range –65 to 150 °C

PARAMETER CONDITIONS RATING UNIT

3

3

1, 2

–1.2 to +7.0 V

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

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.

1995 Sep 06

2