© 2001 Fairchild Semiconductor Corporation

DS012023

www.fairchildsemi.com

January 2000

Revised October 2001

74LVT16646 • 74LVTH16646

Low Voltage 16-Bit Transceiver/Register

with 3-STATE Outputs

General Description

The LVT16646 and LVTH16646 contains sixteen non-

inverting bidirectional registered bus transceivers providing

multiplexed transmission of data directly from the input bus

or from the internal storage registers. Each byte has sepa-

rate control inputs which can be shorted together for full

16-bit operation. The DIR inputs determine the direction of

data flow through the device. The CPAB and CPBA inputs

load data into the registers on the LOW-to-HIGH transition

(see Functional Description).

The LVTH16646 data inputs include bushold, eliminating

the need for external pull-up resistors to hold unused

inputs.

These transceivers are designed for low-voltage (3.3V)

interface to a 5V environment. The LVT16646 and

LVTH16646 are fabricated with an advanced BiCMOS

technology to achieve high speed operation similar to 5V

ABT while maintaining low power dissipation.

Features

s Input and output interface capability to systems at

s Bushold data inputs eliminate the need for external

pull-up resistors to hold unused inputs (74LVTH16646)

s Also available without bushold feature (74LVT16646)

s Live insertion/extraction permitted

s Power Up/Down high impedance provides

glitch-free bus loading

s Outputs source/sink

−32 mA/+64 mA

s Latch-up conforms to JEDEC JED78

s ESD performance:

Human-body model

> 2000V

Machine model

> 200V

Charged-device model

> 1000V

Ordering Code:

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbol

Order Number

Package Number

Package Description

74LVT16646MEA

(Preliminary)

MS56A

56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide

74LVT16646MTD

(Preliminary)

MTD56

56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide

74LVTH16646MEA

MS56A

56-Lead Shrink Small Outline Package (SSOP), JEDEC MO-118, 0.300" Wide

74LVTH16646MTD

MTD56

56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide