Datasheet

SN74GTLPH306
8-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES284E – OCTOBER 1999 – REVISED AUGUST 2001
3–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description (continued)
This GTLP device features TI-OPC circuitry, which actively limits 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.
Active bus-hold circuitry holds unused or undriven LVTTL data inputs at a valid logic state. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended.
When V
CC
is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, the output-enable (OE
) input should be tied to V
CC
through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of
the driver.
ORDERING INFORMATION
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
Tube SN74GTLPH306DW
° °
SOIC – DW
Tape and reel SN74GTLPH306DWR
GTLPH306
–40
°
C to 85
°
C
TSSOP – PW Tape and reel SN74GTLPH306PWR GH306
TVSOP – DGV Tape and reel SN74GTLPH306DGVR GH306
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
functional description
The SN74GTLPH306 is an 8-bit bus transceiver and is designed for asynchronous communication between
data buses. The device transmits data from the A port to the B port or from the B port to the A port, depending
on the logic level at the direction-control (DIR) input. OE
can be used to disable the device so the buses are
effectively isolated. Data polarity is noninverting.
For A-to-B data flow, when OE
is low and DIR is high, the B outputs take on the logic value of the A inputs. When
OE
is high, the outputs are in the high-impedance state.
The data flow for B to A is similar to A to B, except OE
and DIR are low.
FUNCTION TABLE
INPUTS
OE DIR
OUTPUT MODE
H X Z Isolation
L L B data to A port
L H A data to B port
True transparent