Datasheet

SN74GTLP817
GTLP-TO-LVTTL 1-TO-6 FANOUT DRIVER
SCES285E – OCTOBER 1999 – REVISED AUGUST 2001
3–12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
description (continued)
This device is fully specified for hot-insertion applications using I
off
and power-up 3-state. The I
off
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 down,
which prevents driver conflict.
This device features adjustable edge-rate control (ERC). Changing the ERC input voltage between GND and
V
CC
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. ERC automatically is selected to the same speed as alternate source
1-to-6 fanout drivers that use pin 18 for 3.3-V or 5-V V
CC
.
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 SN74GTLP817DW
° °
SOIC – DW
Tape and reel SN74GTLP817DWR
GTLP817
–40
°
C to 85
°
C
TSSOP – PW Tape and reel SN74GTLP817PWR GT817
TVSOP – DGV Tape and reel SN74GTLP817DGVR GT817
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
functional description
The SN74GTLP817 is a fanout driver providing LVTTL-to-GTLP translation and GTLP-to-LVTTL translation in
the same package.
The LVTTL-to-GTLP direction is a 1-to-2 fanout driver with a single output enable (OEAB
).
The GTLP-to-LVTTL direction is a 1-to-6 fanout driver with a single output enable (OEBA
).
Data polarity is inverting for both directions.