SN74GTLP21395

TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS

WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY

SCES350C – JUNE 2001 – REVISED NOVEMBER 2001

2

POST OFFICE BOX 655303

description (continued)

GTLP is the Texas Instruments derivative of the Gunning Transceiver Logic (GTL) JEDEC standard JESD 8-3.

The ac specification of the SN74GTLP21395 is given only at the preferred higher noise margin GTLP, but the

application reports, Texas Instruments GTLP Frequently Asked Questions, literature number SCEA019, and

GTLP in BTL Applications, literature number SCEA017.

Normally, the B port operates at GTLP signal levels. The A-port and control inputs operate at LVTTL logic levels,

reference voltage.

circuitry disables the outputs, preventing damaging current backflow through the device when it is powered

down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power

input/output connections, preventing disturbance of active data on the backplane during card insertion or

removal, and permits true live-insertion capability.

This GTLP device features TI-OPC circuitry, which actively limits the overshoot caused by improperly

terminated backplanes, unevenly distributed cards, or empty slots during low-to-high signal transitions. This

improves signal integrity, which allows adequate noise margin to be maintained at higher frequencies.

High-drive GTLP backplane interface devices feature adjustable edge-rate control (ERC). Changing the ERC

input voltage between low and high adjusts the B-port output rise and fall times. This allows the designer to

optimize system data-transfer rate and signal integrity to the backplane load.

through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of

the driver.

terminal assignments

1234

A

1T/C

1Y

1OEBY

2T/C

B

GND

GND

2Y

2OEBY

C

VCC

1OEAB

ERC

1B

D

GND

GND

1A

2B

E

2OEAB

2A

BIAS VCC

VREF

GQN PACKAGE

(TOP VIEW)

1

234

A

B

C

D

E