DESCRIPTION
The 74LVCZ161284A contains eight high speed
non inverting bidirectional buffers and eleven
control/status non-inverting buffers with open
drain outputs fabricated in silicon gate C2MOS
technology. It’s intended to provide a standard
signaling method for a bi-direction parallel
peripheral in an Extended Capabilities Port Mode
(ECP). The HD (Active HIGH) input pin enables
the Cable port to switch from Open Drain to a high
drive totem pole output, capable of sourcing 14mA
on all thirteen buffer and 84mA on PERI LOGIC
OUTPUT buffer. The DIR input determines the
direction of data flow on the bidirectional buffers.
DIR (Active HIGH) enables data flow from A port
to B port. DIR (Active LOW) enables data flow
from B port to A port. The Y output (Y9-Y13) stay
in the high state after power-on until an associated
input A9-A13) goes high. When an associated
input goes high, all Y outputs are active, and non
inverting signals of the associated inputs are
driven through Y outputs. This special feature
prevents printer system errors caused by
deasserting the BUSY signal in the cable at
power-on.
It is available in the commercial temperature
range.

■ HIGH SPEED: tPD = 9ns (MAX.) at VCC = 3V
■ LOW POWER DISSIPATION:
ICC=20µA (MAX) at VCC=3.6V TA=85°C
■ TTL COMPATIBLE INPUTS
VIH=2V (MIN) VIL=0.8(MAX)
■ OPERATING VOLTAGE RANGE:
VCC(OPR) = 3.0V to 3.6V
■ A PORT HAVE STANDARD 4mA TOTEM
POLE OUTPUT
■ B PORT HIGH DRIVE SOURCE/SINK
CAPABILITY OF 14mA
■ AUTO POWER-UP FEATURE TO PREVENT
PRINTER ERRORS
■ SUPPORT IEEE STD 1284-I (LEVEL 1 TYPE)
AND IEEE STD 1284-II (LEVEL 2 TYPE) FOR
BIDIRECTIONAL PARALLEL
COMMUNICATIONS BETWEEN PERSONAL
COMPUTER ANT PRINTING PERIPHERALS
■ TRANSLATION CAPABILITY ALLOW
OUTPUTS ON CABLE SIDE TO INTERFACE
WITH 5V SIGNAL
■ PULL-UP RESISTOR INTEGRATED ON ALL
OPEN-DRAIN OUTPUT ELIMINATE THE
NEED FOR DISCRETE RESISTOR
■ REPLACE THE FUNCTION OF TWO
74LVC1284 DEVICES