Integrated Device Technology, Inc.

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FUNCTIONAL BLOCK DIAGRAM

FAST CMOS

18-BIT REGISTERED

TRANSCEIVER

OEBA

CLKBA

LEBA

OEAB

CLKAB

LEAB

C

C

D

D

2548 drw 01

D

C

D

C

TO 17 OTHER CHANNELS

MILITARY AND COMMERCIAL TEMPERATURE RANGES

AUGUST 1996

©1996 Integrated Device Technology, Inc.

5.9

DSC-2548/7

1

IDT54/74FCT16500AT/CT/ET

IDT54/74FCT162500AT/CT/ET

bit registered transceivers are built using advanced dual metal

CMOS technology. These high-speed, low-power 18-bit reg-

istered bus transceivers combine D-type latches and D-type

flip-flops to allow data flow in transparent, latched and clocked

modes. Data flow in each direction is controlled by output-

enable (OEAB and

OEBA), latch enable (LEAB and LEBA)

and clock (

CLKAB and CLKBA) inputs. For A-to-B data flow,

the device operates in transparent mode when LEAB is HIGH.

When LEAB is LOW, the A data is latched if

CLKAB is held at

a HIGH or LOW logic level. If LEAB is LOW, the A bus data is

stored in the latch/flip-flop on the HIGH-to-LOW transition of

CLKAB. OEAB performs the output enable function on the B

port. Data flow from B port to A port is similar but uses

OEBA,

LEBA and

CLKBA. Flow-through organization of signal pins

simplifies layout. All inputs are designed with hysteresis for

improved noise margin.

The FCT16500AT/CT/ET are ideally suited for driving

high-capacitance loads and low-impedance backplanes. The

output buffers are designed with power off disable capability

to allow "live insertion" of boards when used as backplane

drivers.

The FCT162500AT/CT/ET have balanced output drive

with current limiting resistors. This offers low ground bounce,

minimal undershoot, and controlled output fall times–reducing

the need for external series terminating resistors.

The

FCT162500AT/CT/ET are plug-in replacements for the

FCT16500AT/CT/ET and ABT16500 for on-board bus inter-

face applications.

DESCRIPTION:

The FCT16500AT/CT/ET and FCT162500AT/CT/ET 18-

FEATURES:

• Common features:

–

0.5 MICRON CMOS Technology

–

High-speed, low-power CMOS replacement for

ABT functions

–

–

Low input and output leakage

≤1µA (max.)

–

ESD > 2000V per MIL-STD-883, Method 3015;

> 200V using machine model (C = 200pF, R = 0)

–

Packages include 25 mil pitch SSOP, 19.6 mil pitch

TSSOP, 15.7 mil pitch TVSOP and 25 mil pitch Cerpack

–

Extended commercial range of -40

°C to +85°C

±10%

• Features for FCT16500AT/CT/ET:

–

–

Power off disable outputs permit “live insertion”

–

°C

• Features for FCT162500AT/CT/ET:

–

Balanced Output Drivers:

±24mA (commercial),

±16mA (military)

–

Reduced system switching noise

–

°C