16-Bit Transceivers

CY74FCT16245T

CY74FCT162245T

CY74FCT162H245T

SCCS026 - July 1994 - Revised March 2000

Data sheet acquired from Cypress Semiconductor Corporation.

Data sheet modified to remove devices not offered.

Copyright

1CY74FCT16445T/2

H245T

Features

• FCT-E speed at 3.2 ns

• Power-off disable outputs permits live insertion

• Edge-rate control circuitry for significantly improved

noise characteristics

• Typical output skew < 250 ps

• ESD > 2000V

• TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)

packages

• Industrial temperature range of –40˚C to +85˚C

CY74FCT16245T Features:

• 64 mA sink current, 32 mA source current

CY74FCT162245T Features:

• Balanced output drivers: 24 mA

• Reduced system switching noise

CY74FCT162H245T Features:

• Bus hold on data inputs

• Eliminates the need for external pull-up or pull-down

resistors

Functional Description

These 16-bit transceivers are designed for use in bidirectional

synchronous communication between two buses, where high

speed and low power are required. With the exception of the

CY74FCT16245T, these devices can be operated either as

two independent octals or a single 16-bit transceiver. Direction

of data flow is controlled by (DIR), the Output Enable (OE)

transfers data when LOW and isolates the buses when HIGH.

The output buffers are designed with power off disable capa-

bility to allow for live insertion of boards.

The

CY74FCT16245T

is

ideally

suited

for

driving

high-capacitance loads and low-impedance backplanes.

The CY74FCT162245T has 24-mA balanced output drivers

with current limiting resistors in the outputs. This reduces the

need for external terminating resistors and provides for mini-

mal

undershoot

and

reduced

ground

bounce.

The

CY74FCT162245T is ideal for driving transmission lines.

The CY74FCT162H245T is a 24-mA balanced output part that

has bus hold on the data inputs. The device retains the input’s

last state whenever the input goes to high impedance. This

eliminates the need for pull-up/down resistors and prevents

floating inputs.

GND

Logic Block Diagrams CY74FCT16245T,CY74FCT162245T,

CY74FCT162H245T

Pin Configuration

1

2

3

4

5

6

7

8

9

10

11

12

33

32

31

30

29

25

26

27

28

36

35

34

SSOP/TSSOP

Top View

13

14

15

16

17

18

19

20

21

22

23

24

45

44

43

42

41

37

38

39

40

48

47

46

GND

GND

GND

GND

GND

GND

GND

FCT16245–1

FCT16245–2

FCT16245–3

16245T

162245T

162H245T