Integrated Device Technology, Inc.

DESCRIPTION:

The FCT16841AT/BT/CT/ET and FCT162841AT/BT/CT/

ET 20-bit transparent D-type latches are built using advanced

dual metal CMOS technology. These high-speed, low-power

latches are ideal for temporary storage of data. They can be

used for implementing memory address latches, I/O ports,

and bus drivers. The Output Enable and Latch Enable controls

are organized to operate each device as two 10-bit latches or

one 20-bit latch. Flow-through organization of signal pins

simplifies layout. All inputs are designed with hysteresis for

improved noise margin.

The FCT16841AT/BT/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 FCT162841AT/BT/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

FCT162841AT/BT/CT/ET are plug-in replacements for the

FCT16841AT/BT/CT/ET and ABT16841 for on-board inter-

face applications.

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

FAST CMOS 20-BIT

TRANSPARENT

LATCHES

IDT54/74FCT16841AT/BT/CT/ET

IDT54/74FCT162841AT/BT/CT/ET

FUNCTIONAL BLOCK DIAGRAM

2

2

OE

2

LE

2

2556 drw 02

TO 9 OTHER CHANNELS

C

D

1

OE

1

LE

1

1

2556 drw 01

TO 9 OTHER CHANNELS

C

D

MILITARY AND COMMERCIAL TEMPERATURE RANGES

JULY 1996

©1996 Integrated Device Technology, Inc.

5.18

DSC-2556/7

1

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 FCT16841AT/BT/CT/ET:

–

–

Power off disable outputs permit “live insertion”

–

°C

• Features for FCT162841AT/BT/CT/ET:

–

Balanced Output Drivers:

±24mA (commercial),

±16mA (military)

–

Reduced system switching noise

–

°C