© 2000 Fairchild Semiconductor Corporation

DS500051

www.fairchildsemi.com

September 1997

Revised April 2000

GTLP8T306

8-Bit LVTTL/GTLP Bus Transceiver

General Description

The GTLP8T306 is an 8-bit bus transceiver that provides

LVTTL to GTLP signal level translation. The device pro-

vides a high speed interface between cards operating at

LVTTL logic levels and a backplane operating at GTLP

logic levels. High speed backplane operation is a direct

result of GTLP’s reduced output swing (

<1V), reduced input

threshold levels and output edge rate control. The edge

rate control minimizes bus settling time. GTLP is a Fairchild

Semiconductor derivative of the Gunning Transceiver logic

(GTL) JEDEC standard JESD8-3.

Fairchild’s GTLP has internal output edge-rate control and

is process, voltage, and temperature (PVT) compensated.

Its function is similar to BTL and GTL but with different out-

put levels and receiver thresholds. The GTLP output LOW

level is typically less than 0.5V, the output HIGH level is

1.5V and the receiver threshold is 1.0V.

Features

s Bidirectional interface between GTL/GTLP and LVTTL

logic levels

s Output Edge Rate Control to minimize noise on the

GTLP port

s Power up/down/off high impedance for live insertion

s Standard 245 function

s CMOS technology for low power dissipation

s 5V tolerant inputs and outputs on the A-Port

s Bus-hold data inputs on the A-Port eliminates the need

for external pull-up resistors on unused inputs

s LVTTL compatible driver and control inputs

s Flow through pinout optimizes PCB layout

s Open drain on GTLP to support wired-or connection

s A-Port source/sink

−24 mA/+24 mA

s B-Port sink 50 mA

s Recommended Operating Temperature

−40°C to +85°C

Ordering Code:

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

Logic Symbol

Connection Diagram

Order Number

Package Number

Package Description

GTLP8T306MTC

MTC24

24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide